Page 1
www.SteamPoweredRadio.Com
TECHNICAL
SX-1
AM
TRANSMITTER
MANUAL
~
MAINTENANCE
994 8581 001
994 8581 003
MANUAL
T.M.
@
No.
888-2126-028
Copyright
1983
All
HARRIS
Rights
IJHARRIS
CORPORATION
Reserved
Printed
:
De
cember
01,
1983
Page 2
www.SteamPoweredRadio.Com
Page 3
www.SteamPoweredRadio.Com
SX-1
MANUAL
AM
TRANSMITTER
888-2126-xxx
REVISION
MAINTENANCE
HISTORY
MANUAL
,,----..,
'
REV.
024
022
025
023
020
021
026
027
029
028
II
DATE
09/16/83
09-29-83
09-30-83
10-04-83
10-07-83
10-13-83
10-31-83
11-14-83
11-22-83
12-01-83
ECN
27667A
27736
27740
27737
27731
27738
27770
27779
27833
27800
PAGES
Replaced
Title
&
7-88,
Added Manual
Replaced
Title
7-16
Replaced
Title
7-9,
Replaced
Title
8-33/8-34
Replaced
Title
7-7, 7-8, 7-9,
7-28, 7-34,
Replaced
Title
8-7/8-8
Replaced
Title
iv
thru
2-6,
All
of
Added
3-3/3-4
Replaced
Title
7-30, 7-33,
Replaced
Title
xv/xvi,
7-54, 7-55,
Replaced
Title
xv/xvi,
Added
8-77/8-78, 8-79/8-80,
the
Page,
7-89/7-90,
the
Page,
and
7-65 & 7-66
the
Page,
7-10,
Page,
and
the
Page,
the
Page,
the
Page,
the
xvi
2-7 & 2-8
Sections
the
following:
the
Page,
the
Page,
7-1,
the
Page,
8-2
the
following
AFFECTED
following
2-2,
Manual
Manual
7-35,
Manual
Manual
Manual
7-34
Manual
7-56,
Manual
7-2, 7-6,
Revision
following
Manual
following
Manual
7-31
following
following
7-10, 7-15,
7-36
following
following
IV, V, and
following
following
7-2, 7-5,
7-57,
following
8-1 & 8-2,
Revision
Revision
Revision
Revision
Revision
Revision
Revision
pages:
History
pages:
Revision
pages:
Revision
pages:
pages:
pages:
pages:
pages:
pages:
7-24,
8-2,
pages:
pages:
8-81/8-82,
7-20, 7-21,
8-15/8-16,
Page
History
History
History
History
7-16,
History
History
VII
History
·History
8-45/8-46
History
Page
Page
Page
Page
7-25, 7-29,
Page
8-83/8-84
Page,
Page,
Page,
Page
7-17,
7-86,
8-75/8-76
7-87
7-15
7-3,
7-60,
7-18,
7-34,
&
888-2126-028
Page 4
www.SteamPoweredRadio.Com
Page 5
www.SteamPoweredRadio.Com
THE
CURRENTS
DANGEROUS.
SAFETY
REGULATIONS.
AND
VOLTAGES
PERSONNEL
WARNING
IN THIS
MUST
AT
EQUIPMENT
ALL
TIMES
ARE
OBSERVE
This
who
manual
are
aware
is
intended
electrical/electronic
statement
using
The
installation,
involves
qualified
responsible
the
use
During
fire
Protection
of
all
this
or
risks
personnel
for
of
improperly
installation
protection
Association
-
Automatic
-
Installation,
No.
-
Halogenated
other
both
10
ALWAYS
DOORS,
ALWAYS
VOLTAGE
INTERNAL
SERVICE
of
the
circuits.
safety
electronic
operation,
to
exercising
injury
trained
and
standards
Fire
DISCONNECT
ENCLOSURES,
USE
WHEN
as a general
dangers
precautions
equipment
maintenance
personnel
and
due
or
damage
or
inexperienced
operation
must
(NFPA)
standards
Detectors,
Maintenance,
Fire
Extinguishing
POWER
GROUNDING
POINTS
BEFORE
ADJUSTMENTS,
ALONE
OR
guide
inherent
It
is
which
equipment,
care.
resulting
of
this
be
observed.
are
No
and Use
WARNING
BEFORE
GATES,
STICKS
SERVICING.
PERFORM
WHEN
for
in
handling
not
intended
should
.
and
HARRIS
from
personnel
equipment,
recommended
. 72E
of
Agent
OPENING
PANELS
AND
SHORT
MAINTENANCE
FATIGUED.
trained
be
service
and
must
CORPORATION
improper
The
Portable
Systems,
OR
NEVER
and
qualified
potentially
to
contain
observed
of
be
performing
local
following
as
references:
Fire
No.
COVERS,
SHIELDS.
OUT
HIGH
MAKE
OR
a
by
personnel
this
performed
shall
procedures
such
building
National
Extinguishers,
12A
personnel
hazardous
complete
in
equipment
only
or
not
by
be
from
tasks.
codes
and
Fire
Do
not
remove,
covers,
circuits,
doors,
know
short-circuit
enclosures,
your
equipment
IN
CASE
OF
EMERGENCY
DISCONNECTED.
or
gates,
and
tamper
panels
don't
take
with
or
shields
chances.
interlock
. Keep away from
switches
on
access
live
WARNING
ENSURE
THAT
POWER
HAS
BEEN
888-2126-001 i
Page 6
www.SteamPoweredRadio.Com
Treatment
If
1.
PLACE
@
UNCONSCIOUS
IF
OPEN
LIFT
PUSH
CLEAR
OBSERVE
Electrical
of
victim
VICTIM
AIRWAY
AIRWAY
NECK
UP
FOREHEAD
MOUTH
OUT
FOR
not
is
HIS
ON
FLAT
,
BACK
NECESSARY
IF
BREATHING
Shock
responsive
A
ON
BACK
HARD
follow
SURFA
CE
A-B-Cs
the
®
NOT
IF
BEGIN
BREATHING
TILT
PINCH
MAKE
QUICK
4
REMEMBER
MUST
of
BREATHING
BREATHING,
ARTIFICIAL
HEAD
NOSTRILS
AIRTIGHT
BE
BREATHS
FULL
MOUTH
OMMEN
C
SEAL
TO
ED
C
basic
MOUTH
SOON
AS
suppo
life
RESUSCITATION
POSSIBLE
AS
rt
.
,--....
CAROTID
CHECK
PULSE
IF
ARTIFICIAL
BEGIN
CIRCULATION
Call
If
2.
a.
b.
c.
ABSENT,
for
victim
keep
keep
loosen
(a
PULSE
medical
is
them
em
th
their
recli
©CIRCULATION
DEPRESS
assistance
responsive.
warm
quiet
as
clothing
position
ning
STERNUM
E:
NOT
possible
as
is
2•
TO
112•
1
APPROX.
{
SEC.
BO
APPRDX.
SEC
60
. 1
1
INTERRUPT
NOT
DO
WHEN
soon
as
SECON
PERSON
D
as
recommended)
RESCUER
ONE
COMPRESSIONS
15
2
rT\t/O
5
BREATHS
QUICK
RESCUERS
COMPRESSIONS
BREATH
RHYTHM
GIVING
IS
possible.
COMPRESSIONS
OF
BREAHI
ii
888-2126- 001
Page 7
www.SteamPoweredRadio.Com
~
Personnel
this
equipment
practices.
procedures,
of
all
personnel
First
Aid
engaged
The
it
is
and
thereby
in
the
are
urged
following
brief
using
the
prevent
installation,
to
information
and
is
only
equipment
avoidable
FIRST-AID
become
is
to
be
to
operation,
familiar
not
intended
used
be
loss
as
prepared
of
maintenance
with
a
reference.
to
life.
first-aid
to
be
give
or
servicing
complete
It
adequate
theory
first-aid
is
the
Emergency
of
and
duty
Treatment
1.
2.
Less
of
Electrical
Extensive
a.
Cover
article.)
b.
Do
clothing,
c.
Treat
d.
Arrange
e.
If
arms
If
hour
vomiting,
soda:
level
of
to
over
if
severe
burned
area
not
break
victim
transportation
or
medical
and
teaspoonful
water
sip
slowly
a
period
vomiting
burns
Burns
and
with
or
apply
for
legs
help
the
give
1
level
(neither
broken
clean
blisters,
any
shock
are
will
victim
him
teaspoonful
about
of
15
occurs.
-
(1st
skin
sheet
remove
salve
as
to
affected
NOTE
not
a weak
of
baking
hot
or
4
ounces
minutes.
(Do
&
2nd
or
tissue,
or
ointment.
required.
a
hospital
keep
be
available
is
conscious
solution
of
soda
cold).
(a
Discontinue
not
give
degree)
cloth.
as
them
salt
to
Allow
half
alcohol.)
(Cleanest
remove
quickly
elevated.
within
and
of
salt
and
each
victim
of
glass)
adhered
as
an
not
and
1/2
quart
fluid
available
particles
possible.
cloth
of
a.
b.
c.
d.
e.
f.
REFERENCE:
Apply
cloth
Do
article.
not
clothing,
Apply
Treat
clean
victim
Arrange
If
arms
ILLINOIS
AMERICAN
(SECOND
cool
break
or
(not
blisters,
apply
dry
for
transportation
or
legs
HEART
RED
CROSS
EDITION)
ice
cold)
remove
salve
dressing
shock
or
if
as
to
are
affected
ASSOCIATION
STANDARD
888-2126-001
compresses
tissue,
ointment.
necessary.
required.
a
hospital
keep
FIRST
as
them
AID
using
remove
quickly
elevated.
AND
the
cleanest
adhered
as
possible.
PERSONAL
available
particles
SAFETY
of
MANUAL
iii
Page 8
www.SteamPoweredRadio.Com
Paragraph
TABLE
OF
CONTENTS
1-1.
1-2.
2-1.
3-1.
3-3.
3-5.
3-7.
3-9.
3-11.
3-14.
3-16.
4-1.
4-3.
4-5.
4-7
.
4-9.
4-
11.
4-12.
4-13.
4-14.
4-15.
4-16.
4-17.
4-18.
4-19.
4-21.
4-22.
4-23.
4-24.
4-26.
4-27.
4-
28.
4-29.
4-31.
4-32.
4-33.
4-35.
4-37.
4-39.
4-40.
4-41.
Introduction
Scope
Introduction
Introduction
Emergency
VSWR
Power
PDM
Power
Crystal
System
Introduction
Station
Maintenance
Preventive
Maintenance
Toroids
Using
Basic
And
SECTION
Protection
Amplifier
Amplifier
Supply
Failure
Controller
Records
Maintenance•······•••••••·
Transistors
Integrated
Capacitors
Fixed
Variable
Fuses
Switches
Indicators
Resistors
..............
. ................................................
Printed-Circuit
Air
System
The Keypad
Control
Status/Fault
Supply Voltage
Power
Forward/Reflected
PA
PA
IPA
Fuse
Temperature
PDM
Phase
Power
Supply
Current
Voltage
Drive
Finder
Amp
Angle
Level
SECTION
..•...•.•...•.......•..........•..................
Purpose
I.
GENERAL
INFORMATION
...........................................
SECTION
II.
OPERATION
..................................................
III.
......•..................................••••..•..
Operating
EMERGENCY
Procedures
. ........................................... .
Failure
Module
Failure
Failure
........................................
OPERATING
For
PROCEDURES
SX
Transmitters••••·•••··
. ................................... .
. .
..
........................... .
.............................................
Board
SECTION
Failure
IV.
. ........................... .
MAINTENANCE
..................................................
......................
Logbook·••·•·······••••·
Of
Components····••
.••.....•.........•...•.••..••......•.•••.•....
.
Circuits
.
.....
..................................... .
...
...................................... .
. ......................................... .
.
Resistors
......................................
.
...................•....
···
·····••••······•••••
·
····••••••····••••·•·•··
•·
·········••••····•••••···••
.......................................
..................................................
And
Indicator
Switches
. ....................... .
...
Boards
......
. .............................................. .
And
Display
And
Status
Display
.
..........................................
Current
. .................................. .
. ...............
. .............
Power
..............................
Unit
. ................................. .
. ........................... .
....
................. .
..
..................... .
................................................
................................................
Level
Trans
. ..............................
•.•....
Readings·••••••··••••·••••••···••···••·••·••••
is
Detector••·•••••··••••••···••••··•••··••••····
Settings
tors
....
.•..•.......................••.••..•
.•••
•••
•.••••.••••••••••••..•••
.••.•••..•...••••..•..•..••...•..••
....
.......
•••
•••.•
..•
·
.
.
.
.
1-1
1-1
2-1
3-1
3-1
3-1
3-1
3-2
3-2
3-2
3-3
4-1
4-1
4-1
4-2
4-2
4-2
4-3
4-3
4-4
4-4
4-4
4-5
4-5
4- 6
4- 6
4-6
4-7
4-7
4- 7
4-7
4- 9
4-9
4-9
4-9
4-10
4-10
4-11
4-11
4-12
4-12
.,.,..-----.,.,
'---
·
iv
WARNING:
Disconnect
888-2126-026
primary
power
prior
to
servicing.
Page 9
www.SteamPoweredRadio.Com
TABLE
OF
CONTENTS
(Continued)
Paragraph
4-52.
4-54.
4-55.
4-56.
4-59.
4-62.
4-65.
4-71.
4-
74.
4-77.
4-81.
4-
83.
4-
85.
4-
87.
4-92.
4-95.
4-113.
4-115.
4-116.
4-118.
4-134.
4-
136.
4-
138.
4-141.
4-144.
4-
150.
4-
153.
4-155.
4-156.
4-157.
4-158.
4-159.
4-172.
4-186.
4-194.
4-196.
4-200.
4-207.
4-210.
4-213.
4-217.
4-223.
4-
224.
4-235.
4-240.
4-249.
4-265.
Internal
Testing
Corrective
Replacing
IPA
Module
PA
Module
PDM
Amplifiers
RFI
Board
RF
Oscillator
PDM
Genera
Directional
Phase
AC
Angle
Controller
References•••••••••••·•••••••·••••····•·•·•·•••••
The
Maintenance
Boards
•.•••••••.••••••.•••.•...•
••••••••••••.•••••••••••.••••••••••••••••.•.••.•
A24
tor
Coupler
Detector
Check The 5
Check
Status
Setting
Setting
Plus
and
Multimeter
Up
The
The Band
Programming The
Aligning
Adjustment
Adjustment
Output
Third
Bandpass
The
Of
Of
Network
Harmonic
Filter
Tee Network - Load
L2
Sliding
11
Tap
....................................................
Meter
Calibration
Mechanical
Forward/Reflected
PA
Volts
PA
Amps
Power
Overload
R55
Overvoltage
R54
Power
R57
PA
R58
Underdrive
R56
Overdrive
R51
VSWR -Reflected
R53
VSWR -Phase
Tuning Procedure
IPA
Tuning
Tuning
Adjusting
SX-1 Top Removal
Technical
.......
•••••••••••••••••••••••••••••••••••••••••••••••••••
Supply
Adjustment
Supply
Current
Procedure
And
Loading
The
Modulation
Assistance
Display
Segments··•••••••••••·····••••••••••••
And
and
Replacing
Adjustment
Board
Procedures
Components····•••••••··
•
.••••••••......•.••..••
••••••••••••••
..............................................
.••.•...••.•.......••..•..........•............
A16
...........................................
A15
••••••••••••••••••••••••••••••••••••••.••••
A18
A27Al
Board A25
Volt
And
Supply
Minus
15
Board
Optional
Switches •••
Frequency
PDM
Generator·••··········•
Directional
Phase
Cold
Trap
L2-C2
Angle
Tuning••
L7-C4
And
Tap
......................•.......
Procedure
Zeroing
Current
••••.•••••••••
Power
...
.........
Calibration
Procedures
(Status
Current
(Status
(Status
(Status
Indication
Indication
Indication
Power
Angle
...........
Detector
Controls•••••••••••···•·•··•··••
Monitor
Procedure
•••••··
•···•••••······••··••••••••••••••••••
••••••••••••.•••••••••••••••
Volts•••••••••
Frequency
Coupler•·•·••••••••••••·······•···
Detector••••••••••••••••••••••
••••••••••·············••···••••••••·
Tune•·•••··••••••••••••••••••·•··•
••.••.••.•
Indication
(Status
.
. . .
·
·••••••··••••••·••••·•·•·•···
••••••••••••••••••••••••••••••••••
•••
·•··•••·•••••··•·
A12
······•·•••••••••••••·•••••·•
Synthesizer•••••••••••••••
••••••••••••••••••
•
•••••••••••
Synthesizer•••••••••••••••••••••
·
··••··•·••••·••·••·
••
•···········•••·•·•••
•••••
••••••••••••••••••••••••••••
•
.
...........•.
. ............................
•
•••••••••••••••••••••••••
•••.
••.•..••
.......
.......................
••
••••••••••
••••••••••••••••••••••••••••••••
"1")
••····•·•·•····•·••··
Indication
"2")
"4")
••••••••••••••••••••••
••••••••••••••••••••••
"8")
(Status
.............
.. ..
Indication
(Status
Sample
. ....
Indication
.
...................
Output
....••..................
.•
• •
••.••••••
•
•.•••.•••••••
"16")
And
"32") ••• ••••••
"64")
•
•·••••••
••••••••••••••••
•
••••••
••••••·•
..........................................
•
..
••
•••
. .
•
•
.
.
Page
4-14
4-
14
4-14
4-14
4-15
4-15
4-15
4-16
4-16
4-
16
4- 17
4-
17
4-17
4-17
4-18
4- 18
4- 20
4-20
4-21
4-22
4-23
4-25
4- 27
4-28
4-28
4-28
4-29
4-29
4-29
4-29
4-29
4-29
4-31
4-32
4-34
4-34
4-34
4- 35
4- 35
4-36
4-36
4- 37
4-37
4-38
4-39
4-40
4-41
WARNING:
Disconnect
888-2126- 026
primary
power
prior
to
servicing.
V
Page 10
www.SteamPoweredRadio.Com
TABLE
OF
CONTENTS
(Continued)
Paragraph
5-1.
5-3.
5-5.
5-6.
5-8.
5-9.
5-10.
5-11.
5-12.
5-13.
5-14.
5-15.
5-16.
5-17.
5-18.
5-19.
5-20.
5-21.
5-23.
5-24.
5-26.
5-27.
5-28.
5-29.
5-30.
5-31.
5-32.
5-33.
5-34.
5-36.
5-37.
5-38.
5-39.
5-40.
5-41.
5-43.
5-44.
Introduction
Initial
Troubleshooting•••••••••••••••••••·••••••·••••••••••••
Symptom:
Buttons
Passi
Are
ble
Loss
Loss
System
Loose
Single
Symptom:
Illuminated
Possible
Fault
Symptom: Low,
But
Contactors
Or
Status
Possible
Open
Failsafe
Fuse
AC
Voltages
Open
Symptom:
Light
Scale
00
Illuminated.
Approximately
On
Keypad Shows
Possible
Transmitter
RF
Contactor
Acorn
Output
Burnt
Phase
Glass
Symptom:
On. The
May
Want
Possible
Power
Ribbon
System
Status
Symptom:
Display
Voltages
Possible
U40, The
SECTION
V.
TROUBLESHOOTING
..................................................
Transmitter
Illuminated•••••••••••••••••••••••••••••••••••••
Causes
Of
AC
Power
Of
Plus
Controller
Ribbon
System
Transmitter
....................................
Causes····••·•···········•···•••••••··•••••·•••••
Status
Med
Do
Indicated··•••••····••···•••••••···•••••••••···•••
Causes
Door
••.••••••••••••••••••••••••
Interlock
Open
Contactor
•••••••••••••••••••••••••••••••••••••••••••••••
On
Transmitter
Causes••••••·••••••·•··•••····••············•···•
Grossly
Arc
Gap Above
Tuning
Or
Loose
Angle
Arc
Detector
Gap
Transmitter
Digital
To
Perform
Causes
Supply
Cable
Controller
And
Multimeter
Transmitter
Causes·•·••••···•··••••••••••••••••••••••••••••••
Analog
Will
....•........................•.....•.....•.
•••••••••••••••••••••••••••
Or Minus 15
Locked
Connectors······••·•••·•······•••••••••••••
Controller
Will
•................•.•...........•..•.•.......
Or
Not
Energize.
......••.•........•...••.•••.•••...........
A25
Coil••••••·•·••
All
1/8
32,
Or
Transmission
Or
Loading
Connections
On
Directional
Display
An
··
·······•••·····••
Voltages
Not
Turn
On -No
Volts••••••••••••••••••••••••••
Out···•••••••••••••••••••••••••
Malfunction
Not
Turn
High
Pushbutton
Open
•••••••••••••••••••••••••••••••••
.••...••••..•..••••.•.•.••••...••••.•.
Fault
Three
And
64,
Light
Are
or
Panel
96
Mistuned
On -Fault
No
Fault
•
•••••••••·····•••••·····•
Illuminated.
Meters
Oscillating.
•••••••••••••••••••••••
Or
Antenna
Line
Loading
Control••·•••••···••···••·••
Control
In
Output
Cable
Bad Or
Coupler
May
Or
May
Not
May
Be
Garbled.
"ON"
Function
On
Status
And
••••••••••••••••••••
Indicators
Lamp
o
•••••••••••••••••••
Connector
Defective
Network
Disconnected
Board
Be
Able
The
By
Itself
•
•••·•••···••·······••··
Multimeter
Control
••••
Lamp
•......
Illuminated
Raise
Indicate
Position
Problem •••••••••
Failure
••••••••••••••
••••••••••••••
To
Be
Transmitter
••••••••••••••
Connections··••••••·•·•••·•••••••••••·•••••
Read
To
Board··•·····••··
Board
Operates
••••.••••••••••••
Normally
Incorrectly•••••••·••••••••·•••••••••
Digital
Converter
·
·•·•·•••••••••••••••
But
All
Digital
Is
Bad··•••··••••••
••
••••
...•..
Illuminated
Up
••
•••••
••••••••••••
••••••••••
Turned
Board
••
••••
••••••
•••
•··
••••
•
Page
5-1
5-4
5-4
5-4
5-4
5-4
5-4
5-4
5-4
5-4
5-4
5-4
5-5
5-5
5-5
5-5
5-5
5-5
5-5
5-5
5-5
5-5
5-6
5-6
5-6
5-6
5-6
5-6
5-6
5-6
5-6
5-6
5-6
5-6
5-6
5-7
5-7
~
~-
vi
WARNING:
Disconnect
888-2126-026
primary
power prior
to
servicing.
Page 11
www.SteamPoweredRadio.Com
Paragraph
5-
45.
5-46.
5-47.
5-48.
5-49.
5-
50.
5-
54.
5-56.
5-5
7.
5-
58.
5-59.
5-
60.
5-61.
5
-62.
5-
63.
5-
64.
S-76.
5
-77.
5-
78.
5-
81.
5-83.
5-
84.
5-
86.
S-
87.
5-88.
5-89.
5-92
.
5-95.
5-
96.
5-
97.
5-99.
5-
100.
5-
101.
5-
105.
5-
106.
5-111.
5-114.
5-116.
5-
118.
5-
120.
U38,
lOV
Q31, Q30,
U57
Analog
Symptom:
Transmitter
Contactors
Possible
Fault
Symptom:
But
No
Not
Be
Status
Transmitter
Power
On
. • • . . . . . . . . . . . . . . . . . . . . . . . • • . . . . . • . . . . . • . • • • • • • • . . • 5-7
Symptom: Remote
Possible
REMOTE/LOCAL
Remote
Remote
Loss
Ribbon
Of +10
Optical
Troubleshooting
Possible
Fault
Supply
Causes
Status
Voltage
Overloads
Fault
Fault
Fault
Fault
Overload
Status
Random
PA
PA
PA
Trips
Current
Current
Current
Status Indication
Status
Status
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . • . . . . . . . . . . . . . • . . 5-
Random
Shorted
Trips
Damper
Mechanical
Shorted
HV
Is
Modul
Fault
Reflected
Trips
Power
Continuous
Fault
Output)
B+
Applied)
ator
Status
Sample)
Occur
.......
Status
......................•.....•.....•••.••••....••.
Continuous
Fault
Handling
Status
MOSFETS
TABLE
OF
CONTENTS
(Continued)
Reference••••••••••••••••••••••••••••••••
U40's
Buffer•••••••·•··••••••····•••••••••••·•·····
Click
Causes
Output
Causes•·•••••••••·•••
Control
Control
Or
Voltage
Shuts
Chatter
Regulators•·•••••••••••••••••·••
Off
Immediately After
Or Drop Out
Intermittently
•••••••••••••••••••••••••••••••••••••••••••
. . . . . . . . . . . . . . . . . . . . . . . . . . . . • . . . . . . . . . . . . . . . 5- 7
Stays
And
Control
Switch
Improperly
Unit
On
(Contactors
High
Voltage
Functions
Supply
Do
Not Wor
•
•·•••••••••••••••••••••••·•
•••••••••••••••••••••••••••••••••••••
Wired•··•···············••••••
Not
Functioning·••••••••••••••·•••••
Volts•··••••••···•••••••••••••·•·····•••••
Connectors
Isolator
A 5
for
Indication
Too
Without
"2",
With
Overloads
Overloads,
Overloads
Indication
Indication
With
Diode
Failure
Filter
....
Efficiency•·••••••••••••••••••••••••••••••••••••
Indication
Loose
.••.•..•••.•••.•••••.••.•.••.••.•
Failure••••••••··••••••••···••·••••••••
Volt
Supply
Overloads
"l",
High•••••••••••••
The
High
PA
Current
Failure··••••••••••
•••••••••••••••••••••••••••••••••
Power
Supply
••••
Voltage
Overload
On
•••••••••••••••••••••
•••••••••••••••••••••••
Audio••·••·•··········••••••••••••••
At
Turn
Continuous
Without
"4",
"8",
"16",
On
•••••••••••••••••••••••••••
Cycling
The
High
Underdrive
Voltage
•••••••••••••••••••••
Overdrive····••·····••·•··•••·
Power
Supply
Audio••••••••••••••••••··•·
....................................•.
Of
Safety
Capacitor
..
.................
"32",
Shorting
(May
VSWR
Switches On
Only
Short
.....
(Directional
·•···•···••••••••·••····•••••·•·•••••••••••
With
High
•...
Cycling
Indication
Cycling,
Indication
Levels
............
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-
"64",
No
Power Out
"96",
Of
Modulation
.
.•..........................•
VSWR
(Phase
••••••••••••
VSWR
(Both
VSWR
Angle
. . . . . . • • • . . • . • • • • • • • . . . • • • • • • • • • • • • • • • • • • • • • 5-
Turn
Energized),
May
Or
May
k••••••••••••••
••
Voltage
•••••••••••
••••••••••••
••••••••••••••••••
On
••••••••••
Current
·
•·•••·•·····
Doors
Out
Whe
n
........
Co
And
upl
High
..
er
Detector
•
•••••••••••••
Sensors)
•
•••••
On,
••••••
··•••··
• • •
••
.....
•
•..
••••••
5-7
5- 7
5- 7
5-7
5-
7
5-8
5-8
5- 8
5-8
5-8
· •
5-8
5
-8
5
-8
5-8
5
-10
5-1
••• 5-10
5-
10
5-
10
·•
5-10
5-11
5
-11
5-
11
5- 11
·
5-11
12
5-12
5-
12
••• 5-12
.
5-12
5-13
5-
13
5-13
14
5-
14
5-14
5-
15
15
0
WARNING:
Disconnect
888-2126-026
primary
power
prior
to
servicing
vii
.
Page 12
www.SteamPoweredRadio.Com
TABLE
CONTENTS
OF
(Continued)
Paragraph
5-123.
5-128.
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164.
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.
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222.
5-
5-223
.
5-225.
5-226.
5-227.
5-228.
5-229.
Testing
In-Circuit
In-Circuit
Ohmmeter
MOSFETS
Ohmmetering The
Ohmmetering The
Testing
Troubleshooting
Symptom:
Open
Ql,Q2
Ul,CR4
U2
U3
Fuse/Loss
,CRl
..................................................
....................................................
..
.......
Troubleshooting
Symptom:
Symptom:
Troubleshooting
Symptom:
Come On •
To
Blown
Check
IPA
PA
Check IPA
Tuning
IPA Output
IPA
Circuit
Half
Check IPA
Check
Oscillator/Frequency
Oscillator/Frequency
Coax Open
Troubleshooting
Causes
Passi
ble
Impedance
Failure
PA
Modulator
Modulator
odulator
M
Voltage
Drive
The
Phasing
Probing
Low
Procedure
RF
Troubleshooting
Troubleshooting
Symptom:
Noise
Level
DC
No
De
012
R30 De
Sample
f
fective
Symptom:
The
From
Symptom:
.............................................
••••••
•••••••
•••·•··••••
•.••••••••
•
No
The
the
Output
.•.•.•
And
(A6
AMP
PDM
A4)
And
(Al
PA
•••••••••••••••·
·
•·
IPA•·
RF
....••.•••.••.••••••••••.••.
+30V
of
••..•.•.•••••..•..••••••••....••••.••••.
•
•
Oscillator•••···•••·••·•·•••····•••·•
••••••••••••••••••••••••••••••••••
MOSFETS
A7)
Transistors
• ••
...............................................
·••••••••••••
Frequency
The
J2
Output
No
Improper
The
Underdrive
•••••••
Fuse
Drive
Square
Tuning···•••••••·••••••••·•·••••••·••••••••••
Failure
Drive
At
Output
Drive
RF
Overload
•••••
•
••••..•.••••••.
...............................
Waves
Open·••··•·•••••••••···•··•·
•••.••••.••.•••••••.••••.••••••••.••••••
Supply
And
Synthesizer•••••
•••••••••·••····•••••·•·•••
6
Pin
Frequency/Loss
System•••••·•········••••··•···
Will
•••••••••••••••••••••
•
................................ .
.
Not
.•..•••••••..•.•••••.•••••
•
Voltage••••••••••••••••••••••
Synthesizer
To
Ratio
. . .
Change
............••......•..•.
··•·····•·•·········•···•
No
Has
...
. .
..
.
Zero
Pulse
Widths
••••••••••••••••••••••••••••••••••••••••••
•
••••
Volts/PA
PA
a
.........
. .
Change
• •
Failure
Failure
Failure
Inside
Testing
.........
.
..........................•...
•.•••••••••••••••••••.••••••.••.•••••.•
..••••
•
- Open Or
-
-
Of The
•.••....•••..••••.••.••.•.•....•••.••••••
.
Measurement•·
Noise•••••·•·••••·•••••
AM
PDM
the
Null
Hum
........
ective
Pulses
No
Transmitter••••
Imba
Control
.
••••••••••••••••••••••••••••••••••••••••••••
.........................................
.
.....
At
lance
In
Synthesizer
Amps
.....
.
Short····•••···•·•·
Short
•..•.•...•••..•...•....••...••.
Open•••••··•••••••••••·••••••••••·•·
Transmitter·•·•
........................••......•.
.
...
·
Generator•••••••••••••••••••••••••••
R30
J4,
...
Causing
··•·•·•·•••·•••·•·••••·•··••·•
•
••
•
......
.......•.............•..........
.
Output
Allow
IPA
Effect
..
.
•
Lock••••••••••
Of
Transmitter
••••••
•
•.••......
•
•••••••••
•
Output•••••
Drive
•••••••••••••••
•••••••••••
•
·••····•••
·
·•••·••·••·•••••
•
••••••••••••
•
••
•
The
On
.......
.
Power
.
Output
•
........
••••
•
•
···•·
•
....
.
··
• •
·••
• •
Page
5-15
5-16
5-17
5-18
5-20
5-20
5-20
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5-21
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5-24
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.
.
,-....._
5-24
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5-34
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5-36
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5-37
5-38
viii
WARNING
Disconnect
:
888-2126-026
primary
power
prior
servicing.
to
Page 13
www.SteamPoweredRadio.Com
TABLE
OF
CONTENTS
(Continued)
Paragraph
5-230.
5-231.
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5-241
5-242.
5-243.
5-246.
6-1.
6-3.
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6
6-44.
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15.
-43
.
.
.
Symptom:
Causing
Tro
ubleshooting
High Ambient
Air
Obstruction
Module
PA
Output
Abnormal
RF
Introduction
Personnel
Principles
AC
RF
AC
Switch
System
Stat
Purpose
Overview
Description
Bus
Read
'A'
'B'
PDM
PDM
PDM
PDM
Oscillator
Optional
Heat
Temperature
PA
Tuning
Drive
Power
Power
Controller
Board
Controller
us
and
Arbitration
Write
Bus
Synthesizer
Status
Overload
PDM
PDM
And
Analog
Status
A-Bus
MUX
And
Analog
Bus
Analog-Digital
Keyboard
Analog
Genera
Amplifier
Pull-Up
Filter
Output(s)
One
Or More
High
At
J4
Always
PDM
Amplifiers
Temperature
In
A High
To
Readings
State,
Conduct
•••••••••••••••••••••
Full
Time
. .............................................. .
...........•.........•.•..•.••.........•.
Sinking
Is
Power Too High
.................................
High
••••••••••••••••
.
................................... .
•••
••••
••••••••••••
........
.................................................
RF
Drive
Phase
SECTION
Level
Balance
VI.
PRINCIPLES
...................................
. .................................. .
OF
OPERATION
..................................................
Protection
Of
Operation•·••·•····•••••••·•••••·•••••••••••••••
Flow
Flow
.....•.••..•.••...••..•.....••
.....•••.
. ........................................ .
.•..
•.
...•
•.•••.•
...••..
•..
•••...•.••..•.•...•••..••.•.
..........................................
. .............................................. .
Board
Multimeter
................•..................................
..................•......................•........
Of T
he
Logic
Selection
Devices
Input
Input
Power
Status
And
LEDs
Address
Scaler
Multiplexer
Devices
And
Outputs
tor
. ......................................... .
Control
Latch
Latch
Latch
Latch
Relay
Latch
Decoder
Data
....•.••..•.•.•••........••.............•..
Converter
Display
..••.......•...•................•.•••.....
••••••••
...............................................
Board
...........................................
..................................................
Al6
. ............................................ .
Frequency
Synthesizer
.
........
···•••••••·
Bus
. .................................. .
........................... .
·
••••••••··•••••
•
••·••··
.....................................
. .................................... .
Latch
U42
U46
U47
. ...............
U48
Control
U53
Latches
System
Controller
•
••••••••••••••••
U54
. ......................... .
. ................................ .
.
........
...................... .
..
.................. .
. .............................. .
Latch
U49
.
..
.................. .
. ................................. .
U52
. .....................
U29
And
U30
•••••••••••••••
U40 ••••
(Al6)
••
U6
. ...................... .
. .................... .
. .................... .
••
••••••••••••••••
••••••••••••••••••••
..
...... .
•••
....
••
....
•
.
·
6-9
6-11
6-12
6-12
6-13
6-13
6-14
6-14
6-14
6-14
6-14
6-15
6
6-17
6-19
6-20
6-21
6-21
6-22
Page
5-39
5-39
5-39
5-40
5-40
5-40
5-40
5-40
5-41
5-41
6-1
6-1
6-2
6-2
6-2
6-3
6-5
6-6
6-7
6-7
6-7
6-7
6-8
6-9
6-9
6-9
-17
WARNING:
Disconnect
888-2
primary
126-026
power
prior
to
servicing
ix
.
Page 14
www.SteamPoweredRadio.Com
TABLE
OF
CONTENTS
(Continued)
Paragraph
6-128.
6-132.
6-134.
6-140.
6-
144.
6-146.
6-153.
6-155.
6-
159.
6-
160.
6-163
6-171.
6-172.
6-173.
7-1.
7-3.
8-1.
.
IPA Board e I t t t t t t t t t t t t t t t t I t t t I t I t I t t I t I I I t I t I t t I t t t t I I I t t I
IPA
Toroid
PA
Board
PA
Toroid
Output
Theory
Directional
VSWR
High
Low
Introduction
Replaceable
Introduction
Board
Voltage
Introduction
Description
Voltage
Introduction
Description
Board
....................................................
...................................................
Network ..............................................
Of
Design
Coupler
(Or
Power
•..
Power
........................
........
Parts
SECTION
..•••.••.........•........................
Phase
...........•.......•.................•........
••••••••.••.•••••••••••••.•...•••••.••••••••••
SECT
Angle
Supply
.....................•••••••................
Supply
ION
.....
Service••••••••••
VIII.
Detector
Board)
.................
··
·······•••••••••········•·••·••·•·
VI
PARTS
I.
...
......
MAINTENANCE
LIST
.....•.....
•
•••••••·••
.
.....................
AIDS
..................
..
•.....•...•••..
••••••••••
••••••
..................................................
.
Page
6-23
6-24
6-24
6-25
6-25
6-26
6-28
6-28
6-29
6-29
6-29
6-32
6-32
6-32
7-1
7-1
8-1
,,,-----_.
A-1.
A-4.
A-6.
A-8.
A-17 .
A-18.
A-23.
A-25.
A-
26.
A-28.
A-29.
A-32.
A-
34.
A-
35.
A-36.
A-40.
A-42.
A-44.
A-47.
A-54.
A-56.
A-89.
Introduction
Unpacking
Returns
General
Setup
General
Equipment
Pre-Installation
Inspection
Mechanical
Ground
Electrical
Power
Electrical
Customer
Audio
Output
Pre
- Turn
Initial
Initial
Technical
......
And Exc
Installation
Procedures
Requirements
Placement·
Installation•·•
Positioning
Strap
Installation
Requirements
Interface
Input
Coax
On
Electrical
Turn
Turn
Assis
APPENDIX
INSTALLATION
A.
..................................................
.........
hanges
..•............•.•..........••.•..............
Inspection·····••····••••••••••••••••••••••••
......................................
. ..................................... .
Information••••••••••••••••••••••••••••••
•
•••••••••••••••••••••··••••••••••••••••
·•••••••••••••••
•••······••••••••·····•
·
. ................................................ .
•
••··············•••••·········•••••
. ..................................... . Equipment
Installation
Installation
Connections••••••••••••••••
Installation
Cable
On
Installation···
Procedures
.............................................
On
tance
..........................................
. ..............................
. ..................................... .
••••..•••••.•••..•••••••.••••••.........
Procedure·••······•···•··•
Procedure•·
Checks
. ............................... .
···
·•···••••·······••••·
·
········•·••••••••••••••••
. .................................. .
•• ••
•
••••·•••·
••••
..
••••••
. .
A-1
A-1
A-1
A-1
A-4
A-4
A- 6
A-6
A-6
A-7
A-7
A-7
A- 7
A-7
A-7
A-8
A-8
A-8
A-12
A-12
A-13
A-17
--
X
WARNING:
Di
sconnect
888-2126-026
primary
power
prior
to
servicing.
Page 15
www.SteamPoweredRadio.Com
TABLE
OF
CONTENTS
(Continued)
Paragraph
B-1.
Introduction
APPENDIX
B.
TEST
EQUIPMENT
..................................................
Page
B-1
WARNING:
888-2126-026
Disconnect primary power prior
to
servicing.
xi
Page 16
www.SteamPoweredRadio.Com
LIST
OF
TABLES
/ ~
Table
2-1.
2-2.
2-3.
2-4.
2-5.
2-6.
2-7.
2-8.
2-9.
2-
10.
2-11.
2-12.
2-13.
2-14.
2-15.
2-16.
5-1.
5-2.
5-3.
Oscillator
System
Status
System
PDM
Generator
Base
PDM
PDM
AC
Indicators
and
PA
AC
PC
Rear
of
Amplifier
Filter
Controller
IPA
Board
Indicators
Board
Power
Power
View
Optional
Typical
Board
Controller
and
Multimeter
Controller
SX-1,
Board AlO,
.......
A5
and IPA Power
Al,
Controls
Panel,
Panel,
of
Transmitter
Frequency
Readings ....
Troubleshooting
Listing
Fuses,
of
Protection
SX-1
Xmtr
Al6,
Board
Controls
Boards
Board
.................................................
Controls
Controls
the
Controls
Board
Al3,
Board A12,
Board A14,
Al5,
Controls
and
A6
and
Controls
A25
and
.........................•.....................
and
and
and
Showing
Synthesizer,
•.....•..•..
SX-1
AM
Devices
•.•••..••.•..••••••..•.•••.•..••••.•••.••...•.•.
and
Indicators
Controls
and
Controls
Controls
and
and
Indicators••••••••••••••••
Indicators•••••••••·••••••••••••••••·
A7,
Controls
and
Indicators••
Fuse Al9F2,
Splitter
Board A26Al,
Indicators••••
Indicators••····••••·••·
Indicators
Interlock
Controls
•.•
......•.•.••.••.••..•.....•.•
Transmitter••••••
in
SX-1
••••··••••···•••••··••••···
•••••••••••••••••••
Indicators••••••••••••
and
Indicators
Indicators
and
Indicators
Controls
•••••
and
••••••••
••••••••••••
•••••••••
•••••••••••
Controls
·
·••••••••••••
•••
•••·•••
•
•••••·····
•••••••••••••••••••••••••
Switches
and
Indicators
•••••
•••••••••••••
•••••••••
•••••••••••••·
•
.
Page
2-3
2-5
2-7
2-11
2-13
2-15
2-17
2-19
2-21
2-23
2-25
2-27
2-29
2-31
2-33
2-34
5-1
5-49
5-51
.
.,.,.-,---.___
6-1.
7-1.
7-2.
7-3.
7-4.
7-5.
7-7.
7-8.
7-
9.
7-10.
7-11.
7-12.
7-13.
7-14.
7-15.
7-16.
7-17.
7-18.
7-19.
7-20.
7-21.
7-22.
7-23.
7-24.
Analog
Replaceable
SX-1
Spare
SX-1
Transformer,
Transformer,
Oscillator
Frequency
IPA
PA
Crystal
Phase Angle
SX43
SX43S
Rec S/C and Fuse
SX-1
Coax
SX-1
PDM
PC
Status/Multimeter
System
PDM
Signals
lkW
Fuses,
PA
Toroid
Toroid
Software
Software
Parts,
Cable,
Basic
Amp
Bd
Assy,
Controller
Gen
and
Parts
SS
AM
Xmtr
SX-1
Board ...
Toroid
Toroid
Bd
•••.•••••.•.
Syn Board
Board,
Bd
••.•...•..
Selection
Detector
Pkg
Format/Freq
PA/Pwr
lkW
AM
Board
Boa
•••••
PDM
r d
••••••••••••••••••••••••••••••
Multiplexer
List
Xmtr
..•..........•
Index••••
••...••.••••....••.•.••••••••••••.••••••.••.•
.••••••....•..••••..•••••••.••••••.•••••••
.
...........................................
....................•.................•...•..
Pins
• .••.•••.••
.............................
••••••••••••
.
......•.•...
•••.
••••••••••••••••••••••••
. ........................................... .
16
to
2
............•.........•...•...•.....•..
.••...•
List•···••••·•··•••••··••••••·•·••••••••••••••
....•...
....•.....•.......•••••....••.•..•••••••••••.••
Pkg
..•.•............••••..•••••••...•••••••••••••
Kit
.•...
........••.•••••••.••.••.••..••••••.....•
Split••••••••••••••••••••••••••••••••••··••••
Xmtr •..
•••••••••••
Amp
•••••••••••••••••
Bd
•··•••·•··•••·••••••••••••••••••••••••••••••
Board••·••••••••••••••••·•••••••••••••••••••••
••.
....•..•
....••.....•••
•...•.••
••••
.•••••
••..••••••••••••••••.•••••••••••••.
•••••
••
•••••
•••••••
......
...•••••
••••••••••••
••••••••
..
.••••.•.•.••••••.••
•..•....•..••..•..
••.....
•••••
••
..•.•••••••••••
•••..•
••••
••••••••••••••••
•••
•••••••••
• •
••...•...
•
••••••••••
•••••
•••••••
6-16
7-2
7-6
7-7
7-10
7-
11
.
7-
12
7-13
7-15
7-
18
7-19
7-20
7-
23
7-24
7-25
7-26
7-27
7-28
7-29
7- 37
7-39
7-40
7- 44
7-46
•
••
xii
WARNING:
888-2126-026
Disconnect primary
power
prior
to
servicing.
Page 17
www.SteamPoweredRadio.Com
LIST
OF
TABLES
(Continued)
Table
7-25.
7-26.
7-27.
7-28.
7-29.
7-30.
7-31.
7-32.
7-33.
7-34.
7-35.
7-36.
7-37.
7-38.
7-39.
A-1.
A-2.
A-3.
Switch
Dir.
Customer
RFI Board
1
kW
Keyboard/Display
H.V.
IPA Pwr
PDM
Cable
Cable
Cable
Cable
Cable
AC
Special
Equipment
List
Customer
Board
Coupler
Int.
.......................................................
PDM
Filter
Filter
Splitter
Pull-Up
114,
Power
Ill SX-1 Main
#6,
Control
113,
HV
#5,
Jumpers
Controller
Installation
Supplied
Supplied
Interface
............................................ ,• ....... .
Board
Board
Bd
Board
Filter
Board
with
. ...........................................
.............................................
Bd
..............................................
Bd
. .......................................... " .
...............................................
Bd
.............................................
......
Supply
......•
Drawer
.........................................
..........................................
..
. .
•...•••.•...•.•.•..............•.
.
........
.......
.......................
.............................................
. ............
. ........................................... .
Tools
with
Transmitter••••••••••••••••
Connection
Transmitter
...
.............................. .
and
Equipment
and
Points•••••••••••••••••••••••••••
.......................
Listed
on
•
••••••••••••••••
Packing
Check
,,
.
...
.
,..
.
Page
7-50
7-51
7-52
7-54
7-58
7-59
7-60
7-61
7-62
7-63
7-64
7-66
7-67
7-68
7-69
A-5
A-5
A-9
WARNING:
888-2126-026
Disconnect primary power prior
to
servicing.
xiii
Page 18
www.SteamPoweredRadio.Com
LIST
OF
ILLUSTRATIONS
Figure
2-1.
2-2.
2-3.
2-4.
2-5.
2-6.
2-7.
2-8.
2-9.
2-10.
2-11.
2-12.
2-13.
2-14.
2-15.
4-1.
4-2.
4-3.
Oscillator
System
Status
System
PDM
Base
PDM
PDM
AC
Indicators
IPA
and
PA
AC
Panel
PC
Rear
Controller
and
Controller
Generator
of
SX-1,
Amplifier
Filter
Controller
Board
Indicators
Board
Power
Removed From
Power
View
Optional
View
Showing
Directional
Top
of
SX-1
Board
Multimeter
Board AlO,
.....................................................
AS
Al,
Panel,
Al6,
Board
Controls
Boards
Board
and
.................................................
Controls
Controls
Controls
Board
Al3,
Board
Board
Al5,
Al4,
Controls
and
A6
and
Controls
A25
and
IPA Power
and
and
and
Controls
Al2,
Controls
Controls
Indicators•
A7,
Controls
and
Fuse
A19F2,
Splitter
Indicators··•••··············•••····••
Indicators
Transmitter·••••••••
Panel,
of
Frequency
Controls
Transmitter
Synthesizer,
11
Cover
Coupler
••..•..••..•..
Cover
and
Indicators
Showing
Interlock
Controls
.. ..
.•.................•....•...•••.•......
Screws···•••·
•
•••.•.•••••.•••••••.••.•••••••••.•..••
Indicators•••••••••••
and
Indicators
and
Indicators
and
Indicators
and
Indicators••••••••••••••••
•
••••••••·•·••••••
and
Indicators•••••••••
Indicators••••··••
Controls
Board A26Al,
and
Controls
Top View With Power
•·•••••·••••·••••••···•••
Front
View
Switches •••••••••••••
and
Indicators
••
•·•••••••••·•••••••••••
•••••
••••••••••••
••••••••
••••••••••••
•
••••·
••··
·•····•
••••••••••••••
•••••••••
•••
•·
.
.
Page
2-2
2-4
2-6
2-10
2-12
2-14
2-16
2-18
2-20
2-22
2-24
2-26
2-28
2-30
2-32
4-42
4-43
4-44
5-1.
5-2.
5-3.
5-4.
5-5.
5-6.
5-7.
5-8.
5-9.
5-10.
5-11.
5-12.
5-13.
5-14.
5-15.
Out
line
PA
Transistor
J4
on
Ql
Collector
50
usec
Upper
Lower
By 4
Upper
Lower
PA
Transistor
PA
Transistor
PA
RF
PA
RF
60
kHz
15
volts
Upper
Lower
ground
Upper
Lower
Upper
Lower
PDM
Amp
JS,
J6
of
MOSFET
Identification•••··••••
A16
Oscillator
on
A25
per
division••••••
Trace -A16
Trace -Q2
•••••••••••••••
Trace
Trace
- IPA
- IPA
Collector,
Outputs
Outputs
Drive
Drive,
Trace
Trace
Trace
Trace
Waveform,
PA
Square
p-p
.........•............•.......•..............•......
- U5-9
Q2
by 2
to 4 volts
- U7-6
- U8-6 (R59)
ON
Waves
Collector
Trace -Ul0-12
Trace
- U9-7 (R46)
A6,
A7
(Cases
Outputs,
of
••••••..••••.•••.••.••••••••••.••.••.••••••..••
·
••·····••••••······•••••••
-
15
AC
Controller
Oscillator
••
•••••••••••••••••••••••••••••
Input,
Transistor
from
from
PA
at
lkW, 30
at
A15
on
A15
(2
(R42),
(R62),
250
MOSFETs)
volts
10
One
One
OFF,
PDM
on
volts
3.5
U8
U9
•••••••••••••••••••••••••••••••••••••••
p-p
·••••••··•••··•·•
30
volts
•••
••••••••••••••••••••••••••·•••••···
Board
A16
volts
Output,
Output
Oscillator
per
division
20
p-p,
at
Board
volts
Quad 1450 kHz,
Quad 550 kHz,
30
volts
PDM
volts
Generator
p-p
p-p
•••••••••••••
••••••••••
U5-ll
Generator
A15, Waveform
per
division
volts
leads
15
volts
leads
volts
p-p
by 90
by
p-p
p-p
90
is
degrees
degrees
ClO
10-25
before
•
per
division••••••
No
Modulation
No
Modulation
•••••••••••••••
and
U5-14,
de
offset
on
both
••••••••••••••••
•••••
•
••••••·····
volts
Divide
•••••••••••••
••••••
•
••••••••
above
traces)
••••
•••••••
p-p
•••••
5-16
5-19
5-42
5-42
5-43
5-43
5-44
5-44
5
-45
5-45
5-46
5-46
5-47
5-47
5-48
·
-------------
xiv
WARNING:
Disconnect
888-2126-026
primary
power
prior
to
servicing.
Page 19
www.SteamPoweredRadio.Com
,..,..-----.._
Figure
LIST
OF
ILLUSTRATIONS
(Continued)
6-1.
6-2.
8-1.
8-1.
8-2.
8-3.
8-4.
8-5.
8-6.
8-7.
8-8.
8-8.
8-
8.
8-8.
8-9.
8-9.
8-10.
8-11.
8-12.
8-13.
8-13
8-14
8-15.
8-16.
8-17.
8-18.
8-19.
8-20.
8-20.
8-20.
8-20.
8-20.
8-
20.
8-20.
8-20.
8-20.
8-20.
8-20.
8-21.
8-22.
8-23.
8-24
8-25.
Output
TEE
Wiring
Wiring
Wiring
Schematic
Schematic
Schematic
Schematic
Schematic
Schematic
Schematic
Schematic
Schematic
Schematic
Schematic
Schematic
Schematic
Schematic
Schematic
.
Schematic
.
Schematic,
Schematic
Schematic
Schematic
Schematic
Outline,
SX-1 Running
SX-1 Running
SX-1 Running
SX-1 Running
SX-1
SX-1
SX-1
SX-1
SX-1 Running
SX-1 Running
SX-1 Running
Optional
Block Diagram SX-1 - 839 5695 333
Simplified
Simplified
Simplified
Network
Network •••••
Diagram SX-1
Diagram SX-1
Diagram Power
AC
Controller••••••••••••••••••••••••••••••
Keyboard/Display•••••••••••
Switch
Oscillator
System
Status/Multimeter
Status/Multimeter
Status/Multimeter
Status/Multimeter
PDM
Generator
PDM
Generator
PDM
Amplifier•••••••••••••••••••••••••••••••••••·••••
lkW
PDM
IPA
Board
PA
Module
PA
Module
Phase
Directional
RFI Board (P/N 992 5886 003)
RFI Board (P/N 992 5886 002)
Customer
SX-1
Running
Running
Running
Running
Frequency
...••..............................................
Sheets
Sheets
Sheets
Sheets
Sheets
Sheets
Sheets
Sheets
Sheets
Sheets
Sheets
HV
Power
LV
Power
Control
••••.•.•••.....•..•..•.•••.•..•.•••.•..••••••.•••.
••••••••••••••••••••••••••••••••••
(Sheet 1 of
(Sheet 2 of
Supply
Board
Controller
Filter
Angle
.....••.•••...••.•••......••.•..•.••...•••
Board·•······•····••••····
Board
Board
.•.•.•••..••••.•......•.•••......•..•...
••••••••..••........•.••......•....•.......••
(Sheet 1 of
(Sheet 2 of
Detector
Coupler
Interface
Explanation
-
(Sheet
(Sheet
(Sheet 4 of
(Sheet
(Sheet
(Sheet
(Sheet
(Sheet
(Sheet
(Sheet
Synthesizer••••
Supply
Supply
Circuit
10
11
Diagram - 839 5695 336
Diagram - 839 5695 337
Diagram - 839 5695 338
2)
2)
SX-1
•••••••••••••••••••
Board
(Sheet
(Sheet
(Sheet
(Sheet
(Sheet
(Sheet 2 of
2)
2)
Board•••••••••••••••••••••••
Board••••••••
Board
2
of
11)
3
of
11)
11)
of
of
of
of
of
of
of
11)
11)
11)
11)
11)
11)
11)
5
6
7
8
9
••
••••••••••••
••••••••••••••••••••••••••••••
•••••••••••••••••••••••••••
•
••••••••••••
•
•
••••••••·•••••··•••••••·••
·
•••·••••••••·•••
••••••••••
•••
...............................
1
of
4)
......................
2
of
4)
......
3
•••••••••••••••••·•••••••·••••
•••••
Sheet
4)
of
4
of
1
••••····•••··••··••••·····••··
......................
4)
. .....................
2)
of
2)
•
••••••••••••••
••••••••••••••••••••••••••
•••
•••••••••••••••••••••
(Sheet
...
......
.
...................
.
.....
...
•••••••••••••••••·••
••
1
of
11)
.......
...........
••··
••••••••••
.........
•
.............................
. ............................
.............................
.............................
........................
.....
.............................
.............................
.............................
............................
........................
••••
••••••••••••••
••••••••••••••••••.•••••••••••.
•
•••••••••••
•••·•••••••••••
···
•• ••••••••••
•••••••••••••••
....
8-3
8-5
8-7
8-9
8-11
8-13
8-15
8-17
8-19
8-21
8-23
8-25
8-27
8- 29
·
8-31
8-33
8-35
8-37
8-39
8-41
8-43
8-45
8-47
8-49
8-51
8-53
8-55
8-57
8-59
8-61
8-63
8-65
8-67
8-69
8-71
8-73
8-75
8-77
8-79
8
8-83
6-27
6-27
-81
A-1.
Correction
Factors
WARNING:
..............................................
Disconnect
888-2126-028
primary
power
prior
to
servicing.
xv/xvi
A-3
Page 20
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Page 21
www.SteamPoweredRadio.Com
SECTION
I
1-1.
1-2.
1-3.
maintain
manual
INTRODUCTION
SCOPE
This
provide
a.
b.
c.
d.
e .
AND
technical
the
SX-1
SECTION
cal
SECTION
boards
well
SECTION
modes
SECTION
tenance
SECTION
PURPOSE
the
manual
and
as a list
of
as
devices
troubleshooting
GENERAL
manual
AM
TRANSMITTER.
following
I,
GENERAL
contains
types
INFORMATION,
contents.
II,
OPERATION,
other
III,
internally
of
typical
EMERGENCY
operation.
IV,
MAINTENANCE,
well
as
alignment
V,
TROUBLESHOOTING,
in
the
transmitter
procedures.
INFORMATION
information
The
various
of
information.
provides
provides
identification
mounted
readings
OPERATING
provides
procedures.
provides
as
well
necessary
sections
introduction
controls
for
the
SX-1
PROCEDURES,
preventive
a
listing
as
low
of
and
and
AM
provides
and
of
power
to
install
this
technical
to
techni-
functions
indicators
TRANSMITTER.
emergency
corrective
the
protection
and
high
and
of
as
main-
power
f.
SECTION
operation
g.
SECTION
h.
SECTION
nance
i.
APPENDIX
dures
j.
APPENDIX
provided
transmitter.
VII,
of
and
VI,
PRINCIPLES
of
the
PARTS
VIII,
the
A,
DIAGRAMS,
transmitter.
INSTALLATION,
initial
B,
TEST
and
OF
various
LIST,
sections
provides
provides
turn
on
instructions.
EQUIPMENT,
recommended
OPERATION,
of
parts
diagrams
provides
provides
to
perform
provides
the
transmitter.
list
detailed
a
list
detailed
for the
to
aid
in
installation
of
the
test
maintenance
theory
transmitter.
the
mainte-
proce-
equipment
on
of
the
WARNING:
888-2126-008
Disconnect
primary
power
prior
to
servicing.
1-1/1-2
Page 22
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Page 23
www.SteamPoweredRadio.Com
SECTION
OPERATION
II
2-1.
2-2.
tion
sary
controls
section.
2-3.
section
on
to
Figure
Figure
Figure 2-3.
Figure
Figure
Figure
Figure
Figure
Figure
Figure
Figure
Figure
Figure
Figure
Figure
INTRODUCTION
Refer
setup
The
of
front
and
following
the
2-1.
2-2.
2-4
2-5.
2-6.
2-7.
2-8 .
2-9
2-10.
2-11.
2-12.
2-13.
2-14.
2-15.
to
the
panel
and
operate
indicators
IF
MITTER
ONLY
USED.
OF
FULFILL
REPLACEMENT.
technical
Oscillator
System
Status
System
.
PDM
Base
PDM
PDM
AC
.
IPA Board
PA
AC
AC
Rear
Interlock
Optional
Operator's
controls
the
on a board
ANY
OF
REQUIRE
AN
A
THE
SAME
is
a
list
manual.
Controller
and
Controller
Generator
of
SX-1
Amplifier
Filter
Controller
AS
Board
Power
Power
View
Al
Panel
Panel
of
Switches
Frequency
Manual
and
indicators,
transmitter
by
WARNING
THE
FUSES
REPLACING,
EXACT
DIFFERENT
SIZE
THE
Board
Multimeter
Board
and
Transmitter
AND/OR
REQUIREMENT
of
figures
A16
Board
Board
Board
Boards
AlO
Board
IPA Power
Top View
Front
supplied
board
on a
basis
with
along
daily
I
IN
THE
SX-1
ENSURE
REPLACEMENT
MANUFACTURER'S
RATING
FOR
and/
or
Al3
Board
Al5
A6
A25
View
Synthesizer
A12
Al4
and
A7
and
Fuse
Splitter
Showing
transmitter
with
basis.
will
TRANS-
THAT
FUSE
FUSE
DOES
A19F2
NOT
EXACT
tables
Board
information
Information
be
supplied
IS
supplied
A26Al
for
informa-
neces-
in
in
2
-2
2-4
2-6
2-10
2-12
2-14
2-
16
2-18
2-20
2-22
2-24
2-26
2- 28
2-30
2-32
on
this
this
Table
2-
16.
Typical
WARNING:
Readings
888-2126-001
Disconnect pri
mary
power
prior
to
servicing.
2-34
2-1
Page 24
www.SteamPoweredRadio.Com
_
,,.--..__
Figure
2-2
2-1.
WARNING:
Oscillator
Board
A16,
888-2126-024
Disconnect primary
Controls
power
prior
and
to
servicing.
2126-lA
Indicators
Page 25
www.SteamPoweredRadio.Com
Table
2-1.
Oscillator
Board
Al6,
Controls
and
Indicators
REF.
1
2
3
4
.5
6
CONTROL/INDICATOR
Frequency
Adjustment
Al6Cl
+30V
FUSE
Al6Fl
Output
Adjustment
Frequency
Level
Al6R27
Monitor
Al6J4
Frequency
Selector,
External
Source
Al6P5
Drive
A16Jl
Adjusts
imately
Protects
within
Adjusts
level.
Output
Counter
lent).
Used
to
lator
or
external
Input
(e.g.
Common
volts
the
~20
the
the
for
(e.g.
select
as
frequency
for
AM
Drive)
p-p.
FUNCTION
carrier
Hz.
+30
volt
oscillator.
oscillator
optional
HARRIS
onboard
source
external
Stereo
.
Nominal
frequency
supply
Frequency
AF-80
crystal
source
(jumper
frequency
Exciter,
from
output
or
(jumper
1-2).
input
approx-
faults
drive
Monitor/
equiva-
oscil-
1-3)
source
Combiner
level
5
WARNING
888-2126-001
:
Disconnect primary
power
prior
to
servicing.
2-3
Page 26
www.SteamPoweredRadio.Com
Figure
2
-2.
Sy
st
em
Co
n t
ro
lle
r
Boa
r d
Al3,
Co
ntr
o
ls
an
d
Indicators
2-4
WARN
ING:
Disconnect
888- 2126-001
primary
power
orior
to
servic
in
o.
Page 27
www.SteamPoweredRadio.Com
Table
2-2.
System
Controller
Board
Al3,
Controls
and
Indicators
REF.
1
2
3
CONTROL/INDICATOR
Reset
Controller
Indicator,
Control,
Status
GO,
Al3S1
Al3DS1
Controller
Indicator,
Status
NO
GO
Al3DS2
Depressing
perform
power
pushbutton
LED
comes on.
Glows
GREEN
functioning
Glows
RED
malfunction.
FUNCTION
S1
causes
fail
should
to
normally.
to
indicate
restart.
be
depressed
indicate
Controller
if
Controller
Controller
to
This
RED
WARNING:
Disconnect
888-2126-001
primary
power
prior
to servicing
2-5
.
Page 28
www.SteamPoweredRadio.Com
Figure
2-3.
Status
and
Multimeter
Board A12,
2-6 888-2126-026
Con
trols
and
2126-3A
Indicators
WARNING
:
Disconnect primary
power prior
to
serv.icing
.
Page 29
www.SteamPoweredRadio.Com
Table
2-3.
Status
and
Multimeter
Board
Al2,
Controls
and
Indicators
REF.
1
2
3
4
CONTROL/IND
Local
RF
Overload
Switch
Drive
Level
Adjustment
R56
Final
fier
Overload
Power
Peak
Adjustment
Current
R57
RF
Drive
Minimum
Overload
Level
Amplitude
Adjustment
R58
ICATOR
Control
Ampli-
When
mote
When
remote
Adjusting
sensitivity
Adjusting
creases
Sl
is
control
Sl
is
control
sensitivity
in
in
R56
of
R56
Overload.
Adjusting
sensitivity
Peak
Current
R57
of
counterclockwise
of
Final
Power
Overload.
Adjusting
sensitivity
Amplitude
R58
of
Overload.
counterclockwise
of
RF
Drive
Overload
.
FUNCTION
the
UP
position,
inputs
the
DOWN
inputs
are
clockwise
RF
Drive
counterclockwise
of
clockwise
Final
Overload.
increases
Amplifier
clockwise
RF
Drive
decreases
Level
Minimum
are
disabled.
position,
enabled.
decreases
Level
RF
Overload.
Drive
decreases
Power
Amplifier
Adjusting
sensitivity
Peak
increases
Level
Adjusting
sensitivity
Amplitude
the
rethe
in-
Level
R57
Current
Minimum
R58
5
6
7
A/D
Converter
Calibrate
Adjustment
R59
Forward Power
Calibration
Potentiometer
Reflected
Power
Calibration
Potentiometer
R62
R61
NOTE
The
high
RF
Drive
limits
Adjusting
the
reading
the
adjusted
Calibrates
meter
Calibrates
voltage
-
both
Digital
for
.
level
maximum
R59
seen
Display.
10.00
forward
reflected
will
is
not
not
and
clockwise
on
#/*
on#/*
power
power
come
within
minimum.
will
52
display
R59
should
52
display.
on
on
on
if
preset
deerease
on
be
power
power
meter.
888-2126-026 2-7
WARNING:
Disconnect
primary
power
prior
to
servicing
.
Page 30
www.SteamPoweredRadio.Com
Table
2-3.
Controls
Status
and
Multimeter
and
Indicators
Board A12,
(Continued)
REF.
8
9
11
12
13
CONTROL/INDICATOR FUNCTION
PA
Current
Calibrates
CURRENT
PA
meter.
Calibration
Potentiometer
Voltage
PA
R60
Calibrates
VOLTAGE
PA
meter.
Calibration
Potentiometer
Adjustment
Antenna
VSWR
Adjustment
Module
PA
Overload
R53
R63
R52
R51
VSWR
Adjustment
function
No
Adjusting
sensitivity
justing
sensitivity
Adjusting
sensitivity
Adjusting
creases
this
at
R51
VSWR
of
counterclockwise
R51
VSWR
of
R53
PA
of
R53
counterclockwise
sensitivity
time.
clockwise
Overload.
clockwise
Module
of
load.
Supply
Current
Overload
R54
Adjustment
Adjusting
sensitivity
Current
R54
of
Overload.
counterclockwise
Power
VDC
260
of
clockwise
VDC
260
increases
Suppl
load.
Spare.
decreases
Overload.
increases
decreases
Overload.
Module
PA
decreases
Power
Adjusting
sensi
Current
y
Ad-
in-
Over-
Supply
R54
ty
vi
ti
Over-
14
Supply
Overload
R55
Voltage
Adjustment
Adjusting
sensitivit
Voltage
counterclockwise
VDC
260
of
load.
2-8 888-2126-026
er
pow
y
WARNING:
Disconnect
primar
R55
260
of
y
Overload.
Power
servicing
to
prior
clockwise
VDC
Adjusting
increases
Supply
.
decreases
Power
sensitivity
Voltage
Supply
R55
Over-
Page 31
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~
THIS
PAGE
LEFT
BLANK
INTENTIONALLY
888- 2126- 001 2- 9
WARNING : Disconnect primary power prior to servicing.
Page 32
www.SteamPoweredRadio.Com
2126-4
Figure
2-4.
2-10
System
WARNING: Disconnect
Controller
Board
Al4,
888-2126-001
primary
power
Controls
prior
to
and
servicing.
Indicators
Page 33
www.SteamPoweredRadio.Com
Table
2-4.
System
Controller
Board
A14,
Controls
and
Indicators
REF.
1
2
3
CONTROL/INDICATOR
Reset
Controller
Indicator,
Control,
Status
GO,
Al4S1
A14DS1
Controller
Indicator,
Status
NO
GO
A14DS2
Depressing
perform
power
pushbutton
comes on.
Glows
GREEN
functioning
Glows
RED
malfunction.
FUNCTION
Sl
causes
fail
should
to
normally.
to
be
pushed
indicate
indicate
Controller
restart.
if
Controller
Controller
RED
to
This
LED
WARNING:
888-2126-001
Disconnect
primary
power
prior
to
servic
ing
2-11
.
Page 34
www.SteamPoweredRadio.Com
us
CMOS
U4
240kHz
DIVIDER
TO
60kHz
240
kHz
OSCILLATOR
Ull
3
Ul2
AMPLIFIER
AND
SJ!IFT
OPERATIONAL
HUM
CARRIER
CANCELLING
U6
CIRRENT
MIRROR
DIGITAL
POTENTIOMETER
U3
Figure 2-5.
RC
FILTER
PDM
Generator
OUTPUT
COMPARATORS
U9,
Board
Al5,
UlO
Controls
and
aize-5
Indicators
U7,
U8
OUTPUT
CONNECTOR
J4
2-12
WARNING:
Di
sconnect
888-2126-001
primary
power
prior
to
servicing.
Page 35
www.SteamPoweredRadio.Com
REF
Table
.
2-5.
CONTROL/INDICATOR
PDM
Generator
Board
Al5,
Controls
FUNCTION
and
Indicators
~
1
3
4
5
6
2
Hum
Null
Adjustment
Al5R30
+30V
-30V
Fuse,
Fuse,
Flat/Bessel
Control,
Maximum
Al5Sl
Output
Adjustment,
Zero
Output
Adjustment,
Al5Fl
Al5F2
Select
Power
Al5R28
Power
Al5R98
Adjusts
best
ning
• 5
volt
tion
. s
volt
signal
Proof
Amp
supply
•
Amp
supply
fuse
fuse
tion.
Selects
transmitter
will
while
be
With
.999,
put
With
,000,
from
be
flatter
obtained
multimeter
adjust
power from
multimeter
adjust
transmitter.
Power
to
of
Performance
(JAG)
from
(JAG)
from
type
will
obta
i ned
in
for
R98
Supply
noise
used
over
used
over
of
frequency
have.
in
BESSEL
frequency
FLAT
position.
position
maximum
transmitter
position
for
zero
hum.
ratio
•
to
current
to
current
Best
response
desired
.
output
Adjust
when
protect
protect
response
loudness
position,
44
reading
44
reading
for
run-
+30
condi-
-30
condi-
will
out-
power
,,---...__
Degree
7
180
Balance
Al5Rl4
Phase
Adjustment
Adjusts
System
each
for
to
of
the
closest
multimeter
two
balance
RF
positions
phases
the
Amplifiers.
match
of
the
phase
of
06,
Polyphase
voltages
Adjust
voltages
07,
08,
at
Rl4
on
and
09.
8
Audio
Adjustment,
Input
Level
Al5R21
Adjusts
+10
audio
dBm.
888-2126-001
input
level
from
-10
2-13
to
WARNING:
Disconnec1 p
rima
ry power prior
to
:;,
ervic;ing.
Page 36
www.SteamPoweredRadio.Com
MODULATION
MONITOR
SAMPLE
ADJUSTMENTS
C40-C43
AlO
Rl-R4
Al9
R4
POWER
SUPP
LY
CURRENT
METERING
SHUNT
MODULATiON
MONITOR
SAMPLE
Al
(MOUNTED
BEHIND
PANEL
2-14 888-2126- 001
·
RZO
9
AC
IN
Figure
.A20
+lOV
POWER
SOME
WARNING:
UNITS)
2-6.
RS
AND
REMOTE
SUPPLY
Base
of
Disconnect
CR2
OUTPUT
SX-1,
primary
4
Controls
power
A20
±3ov
SUPPLY
RECTIFIER
and
Indicators
prior
to
servic
CRl
Al
Cl &
±30V
CAPACITORS
ing
.
C2
FILTER
Page 37
www.SteamPoweredRadio.Com
,,-----._
Table
2-6.
Base
of
SX-1,
Controls
and
Indicators
REF.
1.
2
3
4
CONTROL/INDICATOR
Power
Transformer
Al9Tl
30V
Power
former
Interlock
Trans
A20Tl
Fuse
-
A20Fl
IPA
ment
Supply
A20R3
Adjustand
A20R4
Main Power
volt
de
supply
Secondary
+30VDC,
2
Amp
external
dental
-30VDC,
fuse
interlock
grounding
transmitter
Adjus
FACTORY
t s
the
PRESET -DO
FUNCTION
Supply
.
Power
(Slo-Blo)
will
supply
transformer
Supply
and
24
circuits
.
If
not
return
voltage
NOT
transformer
VAC.
used
to
from
fuse
to
for
is
air.
the
ADJUST.
for
260
for
protect
acciblown
IPA.
WARNING
:
Di
sconnect
888-2126-001
primar
y power prio r
to serv
icin
2-15
g.
Page 38
www.SteamPoweredRadio.Com
2
3
Al9
C2
DAMPER
CAPACITOR
HIGH
VOLTAGE
RECTIFIERS
Al9
CR1-CR4
VARISTOR
.
RVl
Al9 Cl
CAPACITOR
POWER
FILTER
Al9
Al9
R2
AND
HIGH
VOLTAGE
DISCHARGE
DAMPER
A4
R3
FAST
CIRCUIT
HIGH
VOLTAGE
DISCHARGE
SWITCH
Figure
2-
16
2-7.
PDM
Amplifier
WARNING:
Boards
Disconnect
A6
and
A7,
888-2126-001
primary
power
Al9
Controls
prior
CS
to
servicing.
and
2126-7
Indicators
Page 39
www.SteamPoweredRadio.Com
Table
2-7.
PDM
Amplifier
Boards
A6
and
A7,
Controls
and
Indicators
REF.
1
2
3
4
5
6
CONTROL/INDICATOR
PDM
Amplifier
Fuse
AlOFl-A
PDM
Amplifier
Fuse
Al0Fl-B
PDM
A10F2
PDM
Amplifier
-A
Amplifier
Fuse
Fuse
A10F2-B
A6Fl
A7Fl
Protects
current
Protects
current
Protects
current
Protects
current
Protects
current
Protects
current
the
surges
the
surges.
the
surges.
the
surges
+30
surges
+30
surges
FUNCTION
PDM
Amplifier
.
PDM
Amplifier
PDM
Amplifier
PDM
Amplifier
.
volt
on
volt
on
PDM
PDM
supply
Amp
supply
Amp
from
from
from
from
from
Board A6.
from
Board A7.
over
over
over
over
over
over
WARNING:
888-2126-001
Disconnect
primary
power
prior
to
servicing.
2-17
Page 40
www.SteamPoweredRadio.Com
Al0 Fl-A, Fl-B
F2-A,
AND F2-
Figu
re 2-8.
B
2 1
PDM
AMP
LIF
,
IER
2,-1
A6
PDM
Filter
Board
Al0,
Controls
and Indicators
2-18
WARNING:
Disconnect
888-2126-00
p r
imary
power
1
prior
to
servicin
g .
Page 41
www.SteamPoweredRadio.Com
Table
2-8.
PDM
Filter
Board AlO,
Controls
and
Indicators
REF.
1
CONTROL/INDICATOR
Interlock
Switch
Al9S3
Rear
Al9S3
from
thus
260
volt
FUNCTION
Door
is
return
control
disengaged,
leads
preventing
power
of
unwanted
supply.
interlock.
ground
main
is
con
energizlng
When
removed
tac
tors;
of
WARNING
:
Discunne
888-2126-001
ct
primary pow
er
prior
to
;,ervicing.
2-19
Page 42
www.SteamPoweredRadio.Com
2
J I
:::,HARR
LJ
IS w
"'
~ \
~
om
R
2'
RZZ
C"J
5
·tO
~
- z
"'"'
( RI
CRZ
--,
51
I
.........1
i ~=
A(
CONTROLL
c;i
qz
S880
8'+
"3 l655 200
......,
~
._J
ER
002
R[\I' A
t
"'
"'
"' "'
-
.......J
V V
+
0
Figure
2-20 888-2126-014
2-9. AC
WARNING:
Controller
Disconnect primary
Board
A25, Controls
power
prior to servicing.
and
2126-9A
Indicators
Page 43
www.SteamPoweredRadio.Com
Table
2-9.
AC
Controller
Board
A25,
Controls
and
Indicators
REF.
1
2
3
4
5
6
CONTROL/INDICATOR
24
VAC
Fuse
A25Fl
+30V
Adjustment
PA
PA
Fuse,
Current
Current
A25F4
Zero
A25R3
Calibration
Adjustment
PA
Volt
Adjustment,
Supply
A25R2
Zero
A25R22
Current
Calibration
Adjustment,
A25R23
2
Amp
the
Solid
over
current
3
Amp
+5
volt
over
Used
current
to
Current
Used
PA
Used
PA
Used
volt
to
Current
to
voltmeter.
to
power
position
(Slo-Blo)
State
conditions.
(Fast)
power
conditions.
adjust
meter.
adjust
digital
adjust
adjust
supply
02.
FUNCTION
fuse
relays
fuse
used
supply
electrical
the
calibration
reading
the
electrical
the
calibration
current
used
to
from
on
to
protect
from
supply
protect
accidental
zero
of
position
zero
of
multimeter
of
the
PA
the
05.
of
260
888-2126-014
WARNING: Disconnect
primary
pow
er
prior
to
servicing.
2-21
Page 44
www.SteamPoweredRadio.Com
FREQUENCY
MONITOR
SAMPLE
CUSTOMER
INTERFACE
BOARD
IPA
TUNIN
G
CAPACITOR
A26
Cl
2-22
Figure 2-10.
IPA
Board
C
ont
.AS
and
rols and
888-2126-001
lPA
Power
Indicators
Splitter
Board
IPA
2126-10
A26Al,
MODULE
WARNING:
Disconnect
p r
imary
power
prior
to oervicing.
Page 45
www.SteamPoweredRadio.Com
Table
2-10.
IPA Board
Controls
A5
and IPA Power
and
Indicators
Splitter
Board A26Al,
REF.
1
2
3
CONTROL/INDICATOR
IPA
Tuning
A26Ll
+30V
+30V
Fuse,
Fuse,
A5Pl2
A5Fll
Used
input
to
of
Protects
conditions
Protects
conditions
FUNCTION
adjust
PA
Module.
+30V
on
+30V
on
match
supply
the
IPA.
supply
the
IPA.
between
from
from
over
over
IPA
and
current
current
WARNING:
Disconn
888-2126-001
ect prim
ary
power
prior
to
servic
2-23
ing
Page 46
www.SteamPoweredRadio.Com
RF
DRIVE
BYPASS
CAPACITORS
QUAD
4
RF
DRIVE
INPUT
B+
CHOKES
B+(260V)
QUAD
3
.
QUAD
QUAD
2
1
Figure
2-24
2-11.
WARNING:
PA
D
isconn
Boar d
Al, Controls
888-2126-001
ec t prim a
ry
pow
er
prior
and
to servicing
2126-1
Indicators
,
Page 47
www.SteamPoweredRadio.Com
Table
2-11.
PA
Board
Al,
Controls
and
Indicators
REF
1
8
.
thru
CONTROL/INDICATOR
PA
Current
Limiting
Fuses
THESE
FUSES
RECTIFIERS
REGULAR
TION
THE
PERSONNEL
FROM
TRANSMITTER
FUSES
ESPECIALLY
GLASS
AND
CAN
GLASS
CASE -POSSIBLY
INJURY
GLASS
ARE
AND
PARTICLES
INTERIOR.
These
the
fail
transmitter
.
scheme
tions
and
still
of
the
properly
WARNING
SPECIAL
DESIGNED
TRANSISTORS.
FUSES
RESULT
DEFEATS THE
IN
FROM
FUNCTION
fuses
of
As
used
a power
protect
a
in
allow
power
.
I
RECTIFIER
TO
PROTECT
USE
DESTRUCTION
RESULTING
FLYING
THROWN
GLASS
INTO
other
should
result
the
transmitter,
amplifier
the
remaining
amplifier
TYPE
OF
PROTEC-
OF
IN
OR
THE
a
of
circuitry
PA
module
the
fusing
may
sections
to
operate
in
secfail
THE
ACTING
FUSES
CADING
CUR
RECTIFIER
THAN
AND
FAILURES
WITHOUT
TOR. USE
FEATS
THIS
WARRANTY.
WARNING:
D i
TYPE
THE
SO
REGULAR
IS USED
. A
UNDUE STRESS
OF
THE
GLASS
PROTECTION
888- 2126-001
sconnect pri
mary powe
FUSE
TO
PA
FAILURE
AND
IS
FAST
PREVENT
ON
THE
TYPE FUS
WILL
r p ri
or
VOID THE
to
FASTER
ACTING
CAS-
MAY
OC-
MODULA-
ES
DE-
servicing .
2-25
Page 48
www.SteamPoweredRadio.Com
STEP
START
RESISTOR
A
l9Rl
Figur
2-26
e
Top V
iew
WAR
2-
12.
With
NI
NG:
AC
Power
Power
Disconnect
Panel,
Pane
888-2
l
Removed
primary
Controls
126
-0
powe
01
r p r
Fro
io
m T
r
a
nd
I
ransmitter
to
serv
2.
ndicators
ic
ing.
I
2.
$ -
l
2.
.
Page 49
www.SteamPoweredRadio.Com
Table
2-12.
AC
Power
Panel,
Controls
and
Indicators
REF.
1
2
3
4
5
CONTROL/INDICATOR
Relay
Lamp
Circuit
Lamp
Relay
K2
DSl
Breaker,
DS2
Kl
CBl
Relay
high
current
start
DSl
applied
10
low
current
DS2
K2
voltage
sequence.
will
to
Amp
circuit
voltage
condition.
will
limiting
applied
Switch
(i.e
power) .
Relay
Kl
directly
transformer.
FUNCTION
is
used
transformer
illuminate
the
low
power
illuminate
from
.
cabinet
is
used
to
to
resistor
voltage
breaker
supply
the
to
the
apply
ac
through
during
when power
circuitry.
to
protect
from
when power
Main
is
apply
Disconnect
receiving
ac
high
to
the
step
the
an
over
mains
voltage
a
is
is
ac
WARNING:
888-2126-001
Disconnect primary power
prior
to servicing.
2-27
Page 50
www.SteamPoweredRadio.Com
Figure
2-13.
AC
Power
Panel,
Front
Controls
View
2-28 888-2126-001
and
2126-34
Indicators
WARNING:
Disconnect
primary
power
prior
to
servicing.
Page 51
www.SteamPoweredRadio.Com
Table
2-13.
AC
Power
Panel,
Controls
and
Indicators
REF.
1
2
3
CONTROL/IND
POWER
LOW
AC,
VOLTAGE
Circuit
AC,
indicator
indicator
Breaker
ICATOR
POWER
When
power
When
power
illuminated,
is
set
to
supplies.
lines
When
with
illuminated,
supplied
transmitter.
FUNCTION
applied
to
ON
low
voltage
Provides
over
to
low
indicates
to
transmitter.
position,
low
current
indicates
voltage
applies
transmitter
voltage
protection.
ac
circuits
main
power
power
power
ac
ac
in
WARNING:
Disconnect
888-2126-001
primary
power
prior
to
:;ervicing,
2-29
Page 52
www.SteamPoweredRadio.Com
Figure
2-14.
Rear
View
Interlock
of
Transmitter
Switches
2-30 888-2126-014
2126-35A
Showing
WARNING:
Disconnect
primary
power
prior
to
servicing.
Page 53
www.SteamPoweredRadio.Com
Table
2-14.
Rear
View
Interlock
of
Transmitter
Switches
Showing
REF.
1
2
3
4
CONTROL/INDICATOR
Door
Switch
Door
Interlock
A19S3
Safety
Switch
A19S6
Door
Safety
Switch
Al9S1
+260V
Fuse,
Al9F2
When
will
the
to
rear
interrupt
primary
deenergize.
When
this
switch
storage
resistors
When
switch
directly
Protects
the
PA
door
rear
door
capacitors
for
rear
door
will
to
260 V
module.
FUNCTION
is
opened,
the
con
tac
tors,
is
will
discharge
current
is
short
ground.
supply
control
partially
through
limiting.
fully
the
from
this
voltage
allowing
the
opened,
power
faults
switch
to
them
opened,
energy
large
this
supply
on
WARNING
:
Disconnect
888-2126-014
primary
power
prior
to
servicing
2-31
.
Page 54
www.SteamPoweredRadio.Com
6
2
3
Fi
gure
2-
32
2-15. Optional
WARNING:
Frequency
Disconnect
Synthesizer,
888-2126-001
primary
power
prior
Controls
to
servicing
2126-32
and
Indicators
.
Page 55
www.SteamPoweredRadio.Com
Table
2-15.
Optional
Frequency
Synthesizer,
Controls
and
Indicators
REF.
1
2
3
4
CONTROL/INDICATOR
External
Source
RF
Source
Frequency
Jack
Jl
Selector
P2
Fuse,
Frequency
Selection
Dip
Fl
Package
Band
Switches
Sl
An
external
the
oscillator
mately
into
1
and
To
quency
1
and
the
a
Jl.
2.
select
Synthesizer
3.
external
tween 1 and
This
for
To
VCO
(only
fuse
the
select
circuit
one):
525-800
801-1175
entire
kHz
kHz
1176-1605
FUNCTION
frequency
10
volt
P2
must
the
To
select
input
2.
protects
board
which
close
kHz
by
injecting
peak-to-peak
be
connected
RF
source
connect
the
Jl
the
(2A
choke
the
S3
S2
Sl
source
from
P2
RF
source
connect
30
volt
fuse).
is
used
following
can
drive
approxi-
signal
between
the
between
P2
wiring
in
switch
Fre-
from
be-
the
This
5
Output
Adjustment
Level
R41
potentiometer
age
supplied
tors.
clockwise
Turning
will
to
increase
adjusts
the
the
the
output
potentiometer
the
DC volt-
transis-
output
level.
6
Frequency
Adjustment
Reference
Rl4
Adjust
exactly
turret
A
7
Frequency
Jack
Sample
J4
15
a
50
frequency
El6.
volt
ohm
this
10.00
source
potentiometer
MHz
out
peak-to-peak
is
available
calibration.
of
the
square
to
wave
at
obtain
TCXO
with
.J4
at
for
WARNING;
Disconnect
888-2126-001
primary
pow<>r
prior
to
s<>rvic
ing
2-33
.
Page 56
www.SteamPoweredRadio.Com
Table
2-16.
Typical
Readings
Panel
PA
PA
RF
Reflected
Internal
Code
01
02
03
04
05
06-09
10
11
15
16
17
20
21
25
26
27
41
42
43
44
50
Meters
Volts
Amps
Power
(watts)
(watts)
Status
Parameter
PS
PS
Fwd. Power
Refl.
PA
Phase
IPA
PA
IPA
PDM
PDM
Phase
PA
IPA
PDM
PDM
Low
Med
High
Current
+5
51 +15
52
88
Ref.
Lamp
1100 W
Carrier
99
12
1100
0
Readouts
Volts
Current
Power
Current
Voltage
Drive
(Al)
Temp
(A5)
(A6)
(A7)
Det.
(Al)
Fuses
(A5)
(A6)
(A7)
Pwr
Set
Pwr
Set
Pwr
Pwr
Volts
Volts
Volts
Test
Level
Temp
Temp
Temp
Fuses
Output
Output
Set
Reading@
MED
PWR
100%
67
8.4
540
0
1100
Watts
249
5.9
120
0
12.0
105
100
52
32
37
37
0.14
119
119
15
15
.448@
.639@
.938@
.938
5.25
15. 44
10.00
8.8.8.8.8.
Mod
250
500
1100
Carrier
Watts
Watts
Watts
LO
PWR
100%
48
6
270
0
Mod
2-34
WARNING:
Disconnect
888- 2126-001
primary
power
prior
to
servicing.
Page 57
www.SteamPoweredRadio.Com
SECTION
III
3-1.
3-2.
cy
3-3.
3-4.
the
itself
ued
on
of
the
3-5.
3-6.
INTRODUCTION
This
operating
EMERGENCY
The SX-1
protection
.
operation
the
air
the
do's
safety/protection
VSWR
The
protection
ment
tem.
trol
mended
OF
TROLS.
fort
itself
power
which
In
general
circuitry
levels
THE
TRANSMITTER
The
to
change
from
to
connected
open
ter
This
i s
times
capacitors
will
feature
for
the
the
reflected
erly
tuned
section
procedures
transmitter
of
In
most
is
in
all
and
PROTECTION
VSWR
of
the
might
should
set
directional
the
the
air.
increase
between
or
most
likely
is
protection
TUNING
power
antenna.
EMERGENCY
of
the
on
OPERATING
operating
cases
the
acceptable
but
the
don'ts
of
devices
protection
high
be
the
power
installed
VSWR
not
at
the
BE
INCREASED
coupler
load
If
a
thorough
the
transmitter
inductors
detect
as
much
of
and
LOADING
as
indicated
OPERATING
technical
the
SX-1
PROCEDURES
is
equipped
personnel
transmitter
following
most
severe
operation
or
circuits
built
circuitry
between
overloads
be
bypassed
factory.
WITH
within
impedance
a
change
investigation
in
the
this
for
the
the
transmitter
controls
on
manual
AM
TRANSMITTER.
FOR
with
and
is
a
cases.
that
into
the
and
the
and
limits
or
UNDER
THE
the
and
will
in
antenna
and
the
antenna
as
a
protection
should
the
transmitter
PROCEDURES
contains
SX
TRANSMITTERS
several
the
reliability
capable
failure
This
should
be
activated.
SX-1
the
transmitter
protection
transmitter
set
limits
NO
CIRCUMSTANCES
USE
OF
transmitter
cause
impedance
should
antenna.
matching
high
and
VSWR
of
the
should
be
information
safety
of
determining
and
will
section
be
followed
in
the
increased
THE
LOADING
the
be
If
equipment
condition
external
not
adjusted
when
devices
of
the
continue
will
is
of
external
and
the
transmitter's
past
SHOULD
OR
will
detect
transmitter
causes
made
of
there
and
equipment
be
defeated.
so
as
operated
on
transmitter
if
to
discuss
should
both
antenna
the
THE
TUNING
to
the
reflected
all
equipment
are
shorted/-
the
transmit-
shut
to
into
emergen-
both
for
contin-
remain
some
any
of
for
the
equip-
sys-
con-
recom-
POWER
CON-
this
ef-
remove
down.
as
it
At
all
minimize
a
prop-
3-7.
3-8.
ter
CURRENT
power
or
POWER
When a failure
will
show a
and
of
the
LOADING
transmitter
personnel
circuits
are
will
AMPLIFIER
reduction
in
most
transmitter
controls
to
continue
available
continue
WARNING:
FAILURE
of
cases
under
to
the
main
in
output
will
should
this
operating
to
correct
monitor
Disconnect
Power
power
not
show a
not
be
increased
condition.
at
this
the
malfunction.
the
888-2126-001
primary
Amplifier
and a similar
change
It
is
reduced
operation
power
prior
has
occurred
in
PA
by
adjustment
permissible
power
The
of
the
to
servicing.
the
decrease
VOLTAGE.
of
to
until
transmitter
failed
transmit-
in
the
PA
The
output
the
TUNING
allow
the
maintenance
control
module
and
3-1
Page 58
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there
power
should
output.
demodulated
nance
as
soon
be
audio
as
no
ill
If
abnormal
is
noted,
possible.
effects
the
on
transmitter
operation
transmitter
such
operation
as
should
audible
be
other
distortion
scheduled
than
for
reduced
in
the
mainte
,,,-.....
,
-
3-9.
3-10.
series
This
failure.
PDM
When a failure
with
will
certain
in
the
carrier
is
being
stalled
the
output
front
be
quickly
3-
3-12.
be
tain
safely
a
of
removed from
as
11.
POWER
If
performed
components
operated.
step
start
transmitter
of
circuit
damage
the
AMPLIFIER
each
result
The
rare
instances
operated
in
the
power
the
possible.
SUPPLY
the
in
will
breakers
transmitter
MODULE
amplifier
in a reduction
same
comments
power.
at
PDM
circuitry.
to
an
transmitter.
service
FAILURE
main
most
can
One
power
cases
fail
of
resistor
increase
in
itself.
FAILURE
of
a
PDM
section
apply
when a
This
condition
reduced
acceptable
If
and
maintenance
supply
before
and
these
fail
in
dramatically
the
primary
amplifier
in
PDM
power
In
this
should
with
items
the
to
remove
output
here
as
Amplifier
is
or
these
cases
level
condition
personnel
fail,
operation
proper
is
the
open
.
service
module
that
power
for
a
much
Power
fails
most
the
apparent
incorrect
it
with
the
occurs
corrective
can
precautions
step
mode
This
to
the
can
the
occurs
section
like
Amplifier
there
may
be
LOWER
the
alerted
be
restored,
the
start
inrush
cause
transmitter
there
are
from
a Power
will
when
fuses
be
the
have
impossible
pushbutton
transmitter
to
the
action
will
However
transmitter
resistor(s).
current
premature
but
fuses
operation.
Amplifier
failure.
an
increase
transmitter
been
to
lower
on
should
problem
have
can
Should
into
tripping
will
in
In
in-
the
as
to
cer-
be
the
not
3-13.
simply
diodes
a
If
removing
in
severe
Another
damage
of
operation
3-14,
CRYSTAL
3-15. If
maintain
cases
the
detected
a st
able
ternal
input
frequency
for
correct
frequency
quired
by
3- 2
a
rectifier
the
power
degradation
problem
the
power
is
not rec
FAILURE
a
crystal
the
proper
oscillator
by
the
rf
signal
on
sources.
operation.
care
must
the
FCC
the
failed
supply
with
ommended
control
generator.
the
oscillator
This
be
.
should
diode.
and
in
the
this
procedure
transformer
and
should
fail
frequency
will
shut
circuits.
is
a 50
If
a
taken
to
fail
the
This
will
increase
signal
due
i s
discouraged
the
control
down
An
The SX
board
ohm
signal
insure
888-2126-001
transmitter
can
to
noise
will
to
be
high
transmitter
as
required
causing
acceptable
-1
transmitter
for
use
input
and
generator
proper
cause
the
failure
power
ratio
increased
peak
by
the
will
a
fault
frequency
by
stereo
requires
is
used
frequency
can
not
supply
of
heating
currents.
manufacturer
lose
by
the
in
drive
is
equ
i pped
exciters
5
volts
to
of
be
operated
of
the
ripple
the
transmitter.
and
T
his
its
ability
FCC
and
level
reference
with
and
peak
set
the
operation
remaining
causing
possible
mode
,
in
most
to
can
an
ex-
external
to
peak
carrier
as re-
by
of
to
be
be
WARNING:
Disconnect pri
mary
power
prior
to servicing.
Page 59
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3-16.
SYSTEM
CONTROLLER
BOARD
FAILURE
3-17.
or
or
If
may
not
Digital
flashing
open
have
3-18.
press
not
3-19.
ribbon
3-20.
on
3-21.
It
green
the
their
If
that
illuminate,
Remove
connector
Reapply
the
single
Have
is
possible
LED
Controller
mine
which
normally
one
display
Display
of
status
pullout
green
one
board's
the
on.
board
board
with
of
the
any
problems,
lights,
drawer
LED's
of
the
then
all
power
from
power
System
defective
for
In
this
at a time.
is
only
one
two
System
symptoms.
and
illuminated.
two
System
blue
reset
assume
from
the
failed
and
the
Controller
a
System
instance
causing
good
which
or
garbage
look
pushbutton.
that
the
transmitter
board.
board
Controller
Using
the
System
Controller
If
the
may
include
on
to
see
Controllers
this
board
transmitter
board.
replaced
operate
this
problem.
Controller
boards
transmitter
the
Digital
if
both
has
If
has
should
or
repaired
board
the
transmitter
method
Again
board
fails,
changing
Display.
System
a
red
that
board's
failed,
and
disconnect
return
to
be
it
may
the
transmitter
connected.
the
starts
power
Controller
LED
to
as
soon
defective
with
be
possible
transmitter
to
show
for
no
At
this
illuminated,
green
the
normal
long
operation
as
possible.
LED
yet
only
one
to
will
may
control
reason,
point
boards
de-
does
blue
have
System
deter-
operate
a
WARNING:
Disconnect
888-2126-026
primary
power
prior
to
servicing.
3-3/3-4
Page 60
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Page 61
www.SteamPoweredRadio.Com
SECTION
IV
MAINTENANCE
4-1.
4-2.
tive
to
promote
is
4-3.
4-4.
emphasized.
tenance
problem
4-5.
4-6.
maintenance
status.
provide a data
INTRODUCTION
This
maintenance
provide
placed
section
guidance
operational
on
STATION
The
importance
activities.
areas
MAINTENANCE
The
maintenance
A
listing
DISCREPANCY
procedures.
preventive
RECORDS
Separate
and
analyzing
LOGBOOK
activities
of
base
for a failure
provides
for
establishing
readiness
maintenance
of
keeping
logbooks
These
maintenance
records
equipment
logbook
required
preventive
The
information
and
eliminate
and
station
should
can
malfunctions.
should
to
information
reporting
Describe
including
performance
maintenance
contained
a
comprehensive
downtime.
record-keeping
performance
be
maintained
provide
contain
keep
data
a
the
to
system
the
all
characteristics.
information
in
this
maintenance
Particular
functions.
records
by
for
complete'description
equipment
be
recorded
is
as
nature
observable
of
cannot
operation
predicting
in
and
follows:
the
symptoms
and
correcsection
program
emphasis
be
over-
and
main-
potential
of
all
operational
analyzed
malfunction
and
is
to
to
CORRECTIVE
DEFECTIVE
SYSTEM
Ni
l.ME
OF
STATION
PART(S)
ELAPSED
REPAIRMAN
ENGINEER
ACTION
TIME
Describe
rect
List
repaired
a.
b.
c.
d.
e.
Total
Person
Indicates
the
the
all
TIME
PART
SCHEMATIC
ASSEMBLY
REFERENCE
time
repair
the
repair
malfunction.
parts
and
include
IN
USE
NUMBER
NUMBER
NUMBER
DESIGNATOR
on
equipment
who
actually
Chief
of
the
procedure
and
components
the
made
Engineer
equipment
used
following
the
repair
noted
and
to
replaced
details:
approved
cor-
or
WARNING:
Disconnect
888-2126-026
primary
power
prior
to
5ervicing.
4-1
Page 62
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4-7.
PREVENTIVE
MAINTENANCE
4-8.
Preventive
periodically
discriminately,
consists
justing,
of
and
a.
INSPECT. Inspection
operation
Become
order
Inspect
1.
2.
3.
b. FEEL. Use
this
some
occurs
recognize
maintenance
on
equipment
specific
six
operations:
.
instructions
painting.
because
thoroughly
to
recognize
for
the
following
Overheating, which
parts,
and
peculiar
Oxidation.
Dirt,
corrosion,
this
means
defect
. Become
the
can
lack
be
familiar
deviations
is a systematic
Because
these
are
inspecting,
is
the
it
determines
acquainted
and
identify
:
is
indicated
odors.
rust,
operation
of
mildew,
to
proper
detected
with
from
the
procedures
necessary
feeling,
most
with
check
ventilation
and
corrected
operating
normal
series
tightening,
important
the
necessity
normal
abnormal
by
discoloration,
and
fungus
parts
range
of
operations
cannot
.
Preventive
preventive
for
operating
conditions
growth
for
overheating.
or
the
before
serious
temperatures
.
performed
be
applied
maintenance
cleaning,
maintenance
the
conditions
bulging
.
existence
in
order
in-
ad-
others
readily.
trouble
.
in
of
By
of
to
4-9.
4-10.
tenance
4-11.
by
performing
c.
TIGHTEN.
indiscriminately
sure
d.
CLEAN. Clean
for
required
e.
ADJUST.
are
necessary
f.
PAINT.
prime
or
coat
broken
MAINTENANCE
The
following
of
components.
TRANSISTOR
S.
the
following
Tighten loo
which
they
parts
and
only
Make
adjustments
to
Paint
paint
OF
surfaces
if
necessary)
film
COMPONENTS
paragraphs
Preventive
se
as
fittings
are
only
use
approved
maintain
.
provide
maintenance
steps:
screws,
that
designed
when
only
normal
w
ith
the
whenever
information
bolts, and
are
may
be
inspection
cleaning
when
operation
original
inspection
of
transistors
nuts.
tightened
damaged
shows
solvent.
inspection
.
t y
pe
shows
necessary
Do
beyond
or
broken
that
shows
of
is
not
tighten
the
pres-
.
cleaning
that
paint
rust,
for
the
(using
or
main-
accomplished
is
they
worn
4-2
WARNING
: Di
sconnect
888-2126-026
primary
power pri
or
to servicing.
Page 63
www.SteamPoweredRadio.Com
a.
b.
c.
Inspect
lations
Use
compressed
Examine
Tighten
pounds.
silicon
through.
nate
ware
frequently
down
through
mounting
the
transistors
of
dirt
or
dry
all
the
transistors
transistor
Overtightening
insulators
When
replacing
between
evenly.
an
insulator.
hardware
IF
THE
TRANSISTORS
CHANGING,
SISTORS
ARE
ARE
FROM
THE
dust
air
to
mounting
to
curl
This
is
5
inch-pounds.
ENSURE
OF
THE
SAME
and
surrounding
could
form
remove
for
leakage
dust
loose
hardware
the
transistor
up
on
the
a
the
will
Torque
THAT
MOSFET
mounting
minimize
IN
ALL
SAME
transistor,
specification
THE
IPA
OF
TYPE
MANUFACTURER.
area
paths.
from
the
connections
to
no more
hardware
ends
posts
the
to
possibility
REQUIRE
THE
TRAN-
NUMBER
AND
for
area.
and
be
tighten
dirt
or
than
will
possibly
sure
of
for
as
accumu-
corrosion.
5
inch-
cause
the
short
to
alter-
the
hard
shorting
transistor
-
4-12.
is
INTEGRATED
accomplished
a.
b.
4-13.
CAPACITORS.
performing
a.
b.
CIRCUITS.
by
performing
USE
ELECTRICITY
GRATED
Inspect
the
accumulations
Use
compressed
Preventive
the
following
Examine
all
corrosion.
Ensure
capacitor
internal
that
mounting
shorting
Preventive
the
CARE
TO
AVOID
CIRCUITS.
integrated
of
dirt
dry
air
maintenance
steps:
capacitor
component
of
following
THE
WHEN
WORKING
circuits
or
dust
to
remove
terminals
mountings
straps
the
capacitors.
maintenance
steps:
BUILDUP
AROUND
and
could
form
dust
of
capacitors
are
as
excessive
of
OF
STATIC
INTE-
surrounding
leakage
from
for
tight.
the
loose
(Do
pressure
integrated
area
for
paths.
area.
is
accomplished
connections
not
could
circuits
dirt
overtighten
cause
as
by
or
WARNING:
Disconnect
888-2126-026
primary
power
prior
to
servicing.
4- 3
Page 64
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c.
Examine
or
d.
Use
low-wattage
e.
Clean
f.
Inspect
capacitors.
other
standard
cases
the
body
evidence
practices
soldering
and
the
bleeder
of
of
bodies
each
capacitor
breakdown.
to
repair
iron.
of
all
resistors
poor
capacitors
when
for
swelling,
solder
.
inspecting
discoloration,
connections
the
electrolytic
with
a
4-14.
FIXED
accomplished
a .
b.
c.
4-15.
VARIABLE
accomplished
a.
b.
RESISTORS.
by
performing
When
inspecting
component
heating.
possible
When
replacing
responds
parts
Clean
list.
dirty
RESISTORS.
by
performing
Inspect
the
connections
alignment).
should
damage
If
cloth
be
the
necessary,
.
assembly,
Discolored
overload.
a
to
the
resistors
variable
,
and
Sliding
snug,
resistor.
clean
Preventive
the
following
a
chassis,
examine
,
cracked,
resistor
component
with a small
Preventive
the
following
resistors
control
taps
but
not
component
maintenance
steps:
printed-circuit
resistors
or
,
ensure
designated
maintenance
steps
and
knob
on
setscrews
adjustable
excessively
with
of
fixed
board,
for
dirt
or
chipped· components
that
by
the
replacement
the
schematic
brush.
of
variable
:
tighten
all
(do
loose
not
resistors
tight.
a
dry
Overtightening
brush
or
resistors
or
signs
indicate
value
diagram
resistors
mountings,
disturb
such
a
discrete
of
over-
cor-
knob
as
A20R3
lint-free
is
a
and
is
can
,,.----.__
,
c.
4-16.
FUSES.
following
a.
4-4
When
free
dirt
cloth
Preventive
steps:
When
a
replacement.
WARNING
is
difficult
moistened
fuse
:
with
maintenance
blows,
Disconnect
to
remove,
an
approved
is
determine
888-2126-026
primary
power
clean
component
cleaning
accomplished
the
cause
prior
to
servicing
solvent.
by
before
.
with
a
performing
installing
lint-
the
a
Page 65
www.SteamPoweredRadio.Com
b.
c.
d.
Inspect
Examine
brush.
If
necessary,
The
tension
clip
sides
IF
ANY
OF
TRANSMITTER
THAT
USED.
OF
FULFILL
ONLY
THE
AN
A
DIFFERENT
SAME
SIZE
THE
REPLACEMENT.
fuse
caps
clips
for
and
dirt,
tighten
of
the
fuse
closer
together.
THE
REQUIRE
EXACT
FUSES
REPLACING,
REPLACEMENT
MANUFACTURER'S
AND/OR
REQUIREMENT
mounts
for
and,
fuse
clips
clips . may
IN
RATING
charring
if
necessary,
and
be
THE
SX-1
ENSURE
FUSE
FUSE
DOES
FOR
EXACT
and
connections
increased
IS
NOT
corrosion.
clean
by
with
to
the
pressing
a
small
clips.
the
4-17.
SWITCHES.
performing
a.
b.
c.
d.
e.
f.
g.
4-18.
cator
lowing
INDICATORS
lamps and
steps
the
following
Inspect
mounting
Examine
Inspect
looseness
Check
contacts
Operate
positive
Tighten
Be
sure
switches
indicator
:
Preventive
steps:
switch
and
connections.
cases
for
accessible
of
mountings
the
switches
in
action.
all
loose
to
include
located
AND
INDICATOR
maintenance
for
defective
chips
contact
for
pitting,
connections
an
at
the
switches
or
cracks.
switches
or
connections.
corrosion,
to
determine
and
inspection
bottom
SWITCHES.
is
accomplished
of
switches
mechanical
Do
not
or
if
mountings.
of
the
of
the
door
Preventive
is
action
disassemble
for
dirt,
wear.
they
move
power
opening.
maintenance
by
performing
accomplished
or
looseness
switches.
corrosion,
freely
supply
and
discharge
of
the
by
of
or
are
indi-
fol-
a.
To
remove
LOWER)
lamp
pull
may
re-inserting
Therefore,
operation
WARNING
an
then
.
indicator
straight
be
the
care
:
Disconnect
bulb
out
(OFF/FAULT,
on
the
removed from
lens,
must be
depressing
taken
888-2126-026
prima
ry
indicator
the lens
the
to
power
prior to
LOW,
MED,
button.
(indicator
switch
avoid
servicing.
HIGH,
The
button).
is
unavoidable.
disrupting
RAISE
indicator
When
normal
4-5
or
Page 66
www.SteamPoweredRadio.Com
b.
To
the
replace
Switch
one
board
of
the
behind
front
the
panel
meter
switches
panel.
requires
removal
of
4-19.
any
TOROIDS.
signs
of
Inspect
stress.
These
T21, T22, T31, T32, T41,
particular,
of
over
normal
it
4-20.
when
any
of
glossy
would
The
the
core
inspecting
complete
4-21.
boards
PRINTED-CIRCUIT
is
a .
b.
c.
d.
check
the
zener
dissipation.
fini.sh.
be
wise
toroids
modules
may
visual
to
are
cause
the
toroidal
inspection.
check
on
removed
damage
accomplished
Inspect
Inspect
the
the
Check components
Clean
off
dust
When
If
the
BOARDS.
by
printed-circuit
wiring
the
drive
would
and
T42
diodes
overdissipated,
any
of
these
the
rf
drive
backside
for
replacing
to
the
transistors
cores
is
Preventive
performing
for
open
for
breakage
and
dirt
transformer
be
Tll
and
on
the
Power
on
these
transformer
zeners
system.
of
the
IPA and
transistors.
of
by
rotating
maintenance
the
following
boards
for
circuits
or
discoloration
with a clean,
assemblies
Tl2
on
Amplifier
these
are
the
the
steps:
cracks
or
raised
dry
the
assemblies
zeners
found
PA
should
A
same
core.
or
lint-free
periodically
IPA and
board
will
in
this
be
crack
quad.
of
The
This
will
printed-circuit
breaks.
foil.
due
to
overheating.
cloth.
Tll,
Al.
for
signs
lose
their
condition,
inspected
or
break
best
allow
for
Tl2,
In
in
way
a
4-22.
e.
AIR
a.
b.
Use
standard
40
watt
SYSTEM.
The
air
tween
cleaning
Replace
practices
soldering
ENSURE
TO
PDM
THAT
CONNECTING
AMPLIFIER
INSTALLED
WARE
SECURING
PROPERLY
THIS
THE
INSURE
ON
IS
TRANSISTOR
THE
filter
NO
MATING
should
will
filter
if
iron.
THERMAL
PLATES
BOARDS
ON
HEAT
BOARD
TORQUED
ALSO
THE
BURRS
SURFACES.
be
depend on
worn
out.
to
repair
COMPOUND
OF
BEFORE
SINKS
TO
TO
TORQUE
MOUNTING
OR
DIRT
cleaned
the
poor
PA,
solder
IS
APPLIED
IPA,
THEY
AND
THAT
HEAT
5-INCH
SINK
POUNDS.
REQUIRED
SCREWS.
PARTICLES
routinely.
environment.
connections
AND
ARE
HARD-
IS
FOR
ALSO
ARE
T
he
intervals
with
a
be-
,,,---,
4-6 888-2126-026
WARNING:
Disconnect
primary
power
prior
to
servicing.
Page 67
www.SteamPoweredRadio.Com
4-23.
USING
THE
KEYPAD
AND
DISPLAY
UNIT
4-24.
4-25.
nostic
familiar
BASIC
There
purposes.
with
diagnosing
4-26
.
STATUS/FAULT
powered up
status
on.
the
display
If
the
display
transmitter
reasonably
are
the
drive
current,
on
because
eration
is
powered up
faults
fault
still
blank
will
sed
display
DRIVE
Status
timeter
shooting
and
.
is
conditions
exist
when
be
echoed
two
times
will
LEVEL
and
board. If
the
CONTROL
are
several
the
almost
both
the
and
display
and
what
and
possible
expected
level
VSWR
these
If
one
of
try
99.
By
and
.
When
the
*
in
the
indicate
are
Multimeter
RF
drive
AND
STATUS
features
In
this
section
operation
any
board
Remember
or
it
actually
learning
process.
DISPLAY.
fl
and * display
should
does
indicate
not
particular
causes
to
exist
overloads.
conditions
signals
only
these overloads
to
first
depressing
then
*99
is
the
display
still
the
reexami
is
depressed, for
depressed
upper
display
will
any
faults
indicated,
board
driv
as
e l e
system,
designed
we
of
the
Keypad
module
failure.
NOTE
will
use
When
the
be
Keypad
the
should
O
read O refer
fault(
for
these
when
the
The power
should
only
exist
are
clear
*99
or
ne
and
these
#99
the
then
are
a .
change
which
r
efer
an
aid
to
vel
faults
into
will
better
the
explore
in
enough
if
during
transmitter's
read
if
the
transmitter
to
Table
s)
or
alarm(
. The
transmitter
supply
occur
during
found
if
actual
to
faults.
the
System
fault
detectors
example,
when
back
still
to
When
to
exist.
Section
depressing
the
00
troubleshooting
are
still
SX
transmitter
these
detail
personnel
this
low
00
.
4-1
for
s)
may
only
has
faults
just
voltage,
the
transmitter
transmitter
exist
The
when
key
Controller
the
upper
digit
and
the
If
VI
indicated
features
voltage
This
is
an
exist
supply
for
each
9
next
faults
for
the
to
assist
is
the
ready
explanation
inside
which
been
powered up
current,
the
transmitter
number
will
faults
display
9
the
has
been
line
other
theory
Status
begin
for
diag-
and
is
first
fault/-
to
can
is
turned
air
to
clear
clear
which
will
number
depres-
on
than
on
and
trouble
get
with
turn
of
the
be
PA
op-
all
may
go
the
RF
the
Mul-
4-27.
used
SUPPLY
on
the
operation
measures
transmitter
consulted
tested
of
observe
display
Test
probably
the
the
Data
power
at
three
the
should
tapped
transmitte
of
the
DC
is
to
determine
the
power
main
Sheet.
supply
VOLTAGE,
Positions
r since these
the
main
voltage
on
the
factory
buttons
power
be
within
If
incorrectly
(.e.g.
WARNING: Disconnect prima
air.
what
.
supply
this
power
on
supplies
the
The
supply voltage
Bri
ng
the
and
ent
volta
+10%
is
of t
not
for
open
rec
tifi
main
Factory
er the
the case
line vol
888-2126-026
O
through
positions
and
high
Final
transmitter
following
ge '*01'.
he voltage
then
tage or
er
or
ry
pow
10
will
are
concerned
output
voltage
Test
the
transmitter
on
the
sequence
The voltage
recorded
the
main
a component
faile
d c
ontactor).
er prior to servic
be
the
modules,
power
Data
air
supply
Sheets
by
on
displayed
on
the
power
ing
.
most
with
frequently
the
Position
when
should
had
when
depressing
the
Keypad
Factory
transformer
has
failed
Refer
actual
it
on
to the
the
was
one
the*
Fin
4- 7
01
be
to
al
is
in
Page 68
www.SteamPoweredRadio.Com
Table
4-1.
SX
MULTIMETER
CODE
DESCRIPTIONS
CODE
00
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
17
18
. 19
20
21
22
23
24
25
26
27
28
29
36
37
38
39
40
41
42
43
44
45
46
II
BASIC
DESCRIPTION
CONTROL & STATUS
STATUS/FAULT
POWER
POWER
FORWARD
SUPPLY
SUPPLY
POWER
REFLECTED
POWER
AMPLIFIER
PHASE 2 PA
PHASE 1 PA
PHASE 4 PA
PHASE 3 PA
IPA
DRIVE
TEMPERATURE
Al
TEMP
A2
TEMP
A3
TEMP
A4
TEMP
IPA
TEMP
PHASE 2 TEMP
PHASE 1 TEMP
PHASE 4 TEMP
PHASE 3 TEMP
PHASE
ANGLE
OUTPUT
FAULT/STATUS
Al
FUSE
A2
FUSE
A3
FUSE
A4
FUSE
IPA
A6
Q19 & QZO
A7
Ql9 &
A8
Q19 & Q20
A9
Ql9 &
A6
Q39 & Q40
A7
Q39 & Q40
A8
Q39 & Q40
A9
Q39 & Q40
USER
IDLE
LOW
MEDIUM
HIGH
PRESENT
FINDER
FINDER
FINDER
FINDER
FUSE
PROGRAMMING
POWER
POWER
POWER
POWER
POWER
FREQUENCY
FREQUENCY & LOCK
TOTAL
NUMBER
DISPLAY
VOLTAGE
CURRENT
[UNCAL.]
POWER
[UNCAL.]
CURRENT
VOLTS
VOLTS
VOLTS
VOLTS
LEVEL
READINGS
DETECTOR
PER
MODULE
FINDER
Q20
Q20
LEVEL
LEVEL
LEVEL
LEVEL
LEVEL
SYNTHESIZER
IND
OF
FAULTS
FORMAT
999
999
99.9
999
999
99.9
999
999
999
999
999
999
999
999
999
999
999
999
999
999
9.99
999
999
999
999
999
999
999
999
999
999
999
999
999
.999
.999
.999
.999
.999
9999.F
or
.O
999
CODE
II
50
51
52
71
72
73
74
75
76
77
78
79
80
81
88
95
99
DESCRIPTION
INTERNAL
+5
VOLT
+15
VOLT
+10.0000
STORED
STORED
STORED
STORED
STORED
STORED
STORED
STORED
STORED
STORED
STORED
REFERENCES
POWER
POWER
VOLT
PWR
PWR
FORWARD
REFLECTED
PA
PHASE 2 VOLTS
PHASE 1 VOLTS
PHASE 3 VOLTS
PHASE 4 VOLTS
IPA
PHASE
DETECTOR
TEST
LAMP
ROUTINES
TEST
COMMANDS
FREQUENCY
FREQUENCY
CLEAR
FAULT
SUPPLY
SUPPLY
REFERENCE
SUPPLY
SUPPLY
VOLTAGE
CURRENT
POWER
POWER
CURRENT
DRIVE
LEVEL
ANGLE
VOLTAGE
.8.8.8.8.8.
SYNTHESIZER
PROGRAMMING
STATUS
MEM
FORMAT
9.99
99,99
99.99
999
99.9
999
999
99.9
999
999
999
999
999
9.99
95XXXX
4-8
WARNING:
Disconnect
888-2126-026
primary
power
prior
to
servicing.
Page 69
www.SteamPoweredRadio.Com
installation
and
low
voltage
instructions
power
transformers.
for
directions
on how
to
set
the
taps
on
the
main
...---,,__
4-28.
will
power
cause
supply.
indicated
0.
80).
Data
Sheet
4-29.
This
will
can
be
the
following
To
do
this
03
with
POWER
The
the
by
actual
at
SUPPLY
II
display
This
the
following
rated
CURRENT.
to
reading
reading
power
FORWARD/REFLECTED
display
used
simply
the
to
transmitter
the
compute
table
divide
relative
the
by
calculating
the
unmodulated.
Key
indicate
should
equation:
at
output.
POWER.
signals
VSWR
number
RATIO
o.oo
0,01
0.025
0,05
0,075
0.10
0.15
0.20
the
in
what
be
factory
Key
seen
the
on
the
following
current
approximately
I =
POWER
is
in
the
out
of
by
the
ratio
of
position
Then
refer
VSWR
1:1
1.02:1
1.05
1.11:1
1.16
1.22:1
1.35:1
1.50:1
is
being
OUT / (MAIN
recorded
following
the
Directional
power
amplifier
reflected
04 by
to
the
:1
:1
sequence
drawn by
equal
on
the
sequence
to
the
number
table
'1102'.
to
DC
Factory
the
VOLTAGE
This
the
main
current
Test
'*03/104
Coupler. This
modules
forward
on
below
using
volts.
position
for
VSWR.
X
1
•
4-30.
VSWR
of
The
the
position
match.
chart
the
In
shows
LOADING
overloads
However
the
since
transmitter
transmitter
be
reduced
03
and
04
justed
cant
to
change
matching
mitter
4-
31.
read
itself.
PA
closely
position
CURRENT
meter
calculating
4-32.
of
the
PA
PDM
tuning
PA
and
04
zero
will
practice
the
purpose
and
are
adjusted
only
will
is
observed
manually
and
the
correct
in
the
equipment,
CURRENT.
to
is
for reference
on
power
VOLTAGE.
phases
procedure
from
make
it
TUNING
to
the
tolerate
and
above
for
minor
VSWR
or
even a problem
Position
the
analog
the
transmitter
using
Positions
within
of
this
table
the
may
be
of
the
controls
trip
reflected
a
to
trip
the
VSWR
chart.
changes
could
05
meter
only
the
indirect
06,
the
transmitter
the
SX
it
can
VSWR
seen
impossible
positions
in
minimizing
at
or
below
voltage
higher
off
do
at
the
The
TUNING
in
indicate
is
the
on
and
the
should
method.
07,
transmitter
be
seen
by
the
to
hold
03 and 04 and
1.5:1
is
capable
VSWR
to
high
PA
module(s)
at
and
antenna
a
problem
with
08,
PA
current
the
actual
be
09
,
the
front
current
used
are
These
calls
that
PA
VSWR
VSWR
equal
the
at
making
VSWR
at
of
reduced
VSWR
power
the
checked
LOADING
impedance;
with
output
network
meter
of
the
as
for
the
the
phase
positions
for
minimizing
the
to
1:1
or a perfect
at
1:1
the
interaction
the
PA.
full
output
causing
output.
output
power
using
controls
however a
the
antenna,
of
position
transmitter.
displayed
station
voltages
should
reading
but
The
an
overload
positions
can
signifi-
the
and
on
log
and
of
all read
the
on
this
of
VSWR
power.
If
the
should
be ad-
or
the
trans
should
This
the
PA
for
each
-
WARNING:
Disconnect
888-2126-026
primary
po\N
e r
prior
to
servicing
4-9
.
Page 70
www.SteamPoweredRadio.Com
approximately
readings
would
which
would
indicate
refer
amplifiers
the
trouble
the
indicate
that
to
has
failed.
shooting
same
the
positions
guide
voltage
a
PA
PDM
20
If
not,
for
within
or
PDM
Generator
through
then
this
board.
+5%. A
amplliier
may
39
to
suspect
failure
need
adjustment.
determine
the
gross
PDM
imbalance
and a minor
To
if
one
Generator
be
of
and
in
these
imbalance
sure
the
power
refer
of
to
4-33.
by
10.
to
the
the
number
4-34.
(i.e.
installed
cates
and
the
discuss
IPA
The*
final
If
more
a
reading
fuses
how
DRIVE
or#
power
displayed
the
number
than
the
IPA
should
to
check a fuse
LEVEL.
display
amplifier.
on
The
different
the
air.
should
setting
is
mitter
readings
future
15-20%)
module
which
be
Display
will
position
reading
air
as
The
be
and
off
the
is
for
displayed
from
or
Oscillator
is
nearly
checked
on
position
then
This
10
obtained
when
the
opposed
readings
recorded
also
air
at
installed
may
be
diagnostic
on
that
noted
zero
for
the
IPA
indicate
is
is
used
NOTE
transmitter
when
the
referenced
position
may
the
failure.
and
10
by
a
unitless
for
on
position
to
being
on
position
at
the
time
so
purposes.
10
when
be
the
faulty.
IPA
PA
modules.
depressing
the
relative
number
reference
10
is
off
each
power
transmitter
the
trans-
that
these
in
is
significantly
transmitter
module
The
following
only.
is
on
the
10
the
If
is
producing
*
or
amount
which
was
position
paragraphs
II
followed
of
drive
means
different
originally
10
indi-
no
power
will
that
4-35.
flowing
fuse
which
to
operate
board
where
isolator
blown
fuse
System
isolator.
Final
is
data
Test
observed
sheet,
missing.
fail
without
series
removed
is
replaced
the
circuit
following
4-10
FUSE
FINDER.
through
is
a
transistor
the
and
display
detector
Controller
This
Data
which
one
In
certain
a
with
from
the
the
and
with
modules
a
blown.
System
will
reading
Sheets
or
fuse
IPA
cabinet
it
the
have
The
resistor
This
Controller
this
for
be
and
is
significantly
both
cases
opening
on
blows
blown
blown
blown
and
LED
allows
whose
output
as a relative
the
IPA
instructed
is
normally
is
typically
of
the
it
is
up
the
SX-1.
can
lead
again
fuse
then
and
fuse
fuse
detectors
circuit
the
LED,
is
can
measure
reading
is
position
to
display
that
less
fuses
possible
due
to
A
simple
to
the
there
the
IPA
detectors
888-2126-026
instead
contained
fed
into
25.
which
between
that
on
the
for
the
ohmmeter
fuse
is
probably
module
installed:
are
the
the
on
By
the
is
110
the
number
IPA
a
transistor
current
that
operated
of
flowing
within
Status
voltage
the
digital
pressing*
reading
indicated
and
is
limiting
test
has
blown.
a
faulty
should
an
and
out
out
on
120.
on
the
probably
on
with
be
replaced.
by
current
through
optoisolator,
Multimeter
of
the
opto-
display.
or#
of
the
If
the
Factory
a
reading
25
opto-
final
blown
the
IPA
resistor
the
power
If
the
transistor
the
The
the
test
or
to
in
fuse
in
The
WARNING:
Disconnect
primary
power
prior
to
servicing.
Page 71
www.SteamPoweredRadio.Com
~ ,
POSITION
POSITION
POSITION
POSITION
POSITION
21
22
23
24
25
The
module
will
module
Al-----POWER
A2-----POWER
A3-----POWER
A4
- ----POWER
A5-----IPA
fuse
not
is
finders
is
powered up
indicate
powered
AMPLIFIER
AMPLIFIER
AMPLIFIER
AMPLIFIER
MODULE
NOTE
only
a bloYn
off.
operate
and
the
fuse
(SX-1,
(
(
(
(SX-1,
when
detector
if
SX-2.5,
SX-2.5,
SX-2.5,
the
the
SX-5)
SX-5)
SX-5)
SX-5)
SX-5)
4-36.
fuse
display.
the
opened up
faulty
or
4-37.
module
ature
digital
the
grade,
by
properly
There
detector
The
reading
on
fuse(s)
replaced
TEMPERATURE
there
of
each
display.
IPA module
This
noting
the
and
module. The
POSITION
POSITION
POSITION
POSITION
POSITION
POSITION
POSITION
POSITION
POSITION
is
also a fuse
can
be
displayed
procedure
from
the
are
at
the
the
module
required
earliest
is
final
indicated.
the
convenience
READINGS.
are
also
of
and
feature
temperature
then
following
11
temperature
these
An
sensors
example would be *15
display
can
be
of
watching
modules
Al-----POWER
12 A2-----POWER
13 A3-----POWER
14 A4-----POWER
15
16
17
18
A5-----IPA
A6-----PDM
A7-----PDM
A8-----PDM
19 A9-----PDM
detector
same
test
data
then
Along
can
the
temperature
used
to
each
for
have
on
the
by
displaying
as
for
reading
If
repeated
the
module
of
maintenance
with
sensors
be
the
on
read
will
determine
module when
significant
temperature
AMPLIFIER
AMPLIFIER
AMPLIFIER
AMPLIFIER
MODULE
AMPLIFIER
AMPLIFIER
AMPLIFIER
AMPLIFIER
PA
module. The
position
the
IPA module
is
observed
attempts
should
blown
all
in
fuse
power
degrees
select
of
the
if
a module
the
increases
sensors
(SX-1,
( SX-5)
( SX-5)
(
(SX-1,
(SX-1,
(SX-1,
(
(
21
and
then
at
be removed
personnel.
detectors
modules.
Centigrade
the
sensor
IPA
in
has
transmitter
in
installed:
SX-2.5, SX-
SX-2.5,
SX-2.5,
SX-2.5,
SX-2.5,
status
(Al)
if
a
a
fuse
of
on
drop
replacing
and
serviced
on
each
The
temper-
on
attached
degrees
Centi-
malfunctioned
is
operating
a
particular
5)
SX-5)
SX-5)
SX-5)
SX-5)
SX-5)
SX-5)
this
the
in
has
the
RF
the
to
4-38.
does
an
4-39.
amplifier
sist
tors.
It
for
If
not
exist
error
in
PDM
modules
of a detector
The number
will
decrease
typical
a
request
in
entry
AMP
readings.
is
made
the
transmitter
of
the
position
TRANSISTORS.
to
detect
which
measures
displayed
as
power
is
If a transistor
WARNING
:
Disconnect
to
There
if
a
is
relative
turned
display
the
the
display
number
are
also
transistor
the
average
to
up.
Consult
fails
888-2126-026
primary
power
temperature
will
sensors
has
failed.
voltage
the
power
the
it
will
prior
to
show
EEEEEE
contained
on
the
setting
factory
in
most
servicing
of
a module which
to
indicate
on
These
sensors
output
transis-
(pulse
test
data
cases
.
the
PDM
con-
width).
sheets
fail
4-11
in
Page 72
www.SteamPoweredRadio.Com
the
shorted
nearly
AMPS
O
and
following
PDM
amplifier
drain
volts
when
possibly
positions
modules:
to
PA
source
the
VOLTS
are
mode.
transmitter
will
read
available
When
is
this
in
substantially
for
use
occurs
operation.
to
detect
the
sensor
In
higher
failed
will
this
than
MOSFETS
indicate
condition
normal.
on
PA
The
the
POSITION
POSITION
POSITION
POSITION
POSITION
POSITION
POSITION
POSITION
4-40.
Detector
when
Test
PHASE
the
Data
voltage.
transmitter
to
4-41. POWER
play
ter.
is
The power
the
100%
made when
stations
positions
The
within
audio
of
transmitter
the
levels
input
full
changing
where more
day.
26
27
28 A8-----PDM
29
36
37 A7-----PDM
38 A8-----PDM
39 A9-----PDM
ANGLE
find
LEVEL
FCC
power
This
the
SETTINGS.
which
type
for
level
power
DETECTOR.
voltage
is
properly
minimum number
indicate
is
equipped
accepted
LOW,
MEDIUM,
tracks
so
no
adjustment
levels.
than
one power
A6-----PDM
A7-----PDM
A9-----PDM
A6-----PDM
Position
is
a
tuned.
obtained
The
following
the
relative
to
power
and
the
power
This
level
AMPLIFIER
AMPLIFIER
AMPLIFIER
AMPLIFIER
AMPLIFIER
AMPLIFIER
AMPLIFIER
AMPLIFIER
20
will
reference
As
power
handle
range
HIGH
are
output
of
the
feature
is
(SX-1,
(SX-1,
SX-2.5,
SX-2.5,
(
( SX-5)
(SX-1,
(SX-1,
SX-2.5,
SX-2.5,
(
(
indicate
only
and
always,
at
the
factory.
discussion
settings
virtually
at
the
adjustable
level
audio
within+
processing
should
required
refer
touch
simplify
through
the
should
will
of
any
power
of a pushbutton.
independently
SX-5)
SX-5)
SX-5)
SX-5)
SX-5)
SX-5)
SX-5)
Phase
be
at a null
to
the
cover
the
transmit-
level
2%
from
gear
procedures
the
broadcast
Angle
Factory
the
10%
need
disthat
and
to
be
at
4-42.
each
By
power
using
setting
4-43. Position
4-44. Position
4-45. Position
4-46.
width
from
fier
and
sing
button
controlled
The
of
.000
pulse
.500
either
on
relative
the
to
width
may
the
the
by
4-12
the
positions
is
correct
41
will
42
will
43
will
power
POLYPHASE
.999.
Remember
and
not
represent
RAISE
upper
R28
on
right
the
40
for
indicate
indicate
indicate
settings
PULSE
that
output
500
watts)
(increase
front
PDM
Generator
through
the
particular
the
relative
the
relative
the
relative
are
DURATION
these
power
.
These
setting)
panel
. The
board
888-2126-026
44
the
operator
used
power
power
power
power
to
set
output
setting
setting
setting
the carrier
MODULATOR, These
are
(e.g
relative
••
800
settings
or
LOWER
actual
settings
may
represent
are
(decrease
power
.
can
be
assured
desired
for
LOW
for
MEDIUM
for
HIGH
level
settings
of
PDM
1000
changed by
setting)
setting
limits
.
power.
power.
power.
pulse
may
range
ampli
watts
depres-
push-
that
-
are
WARNING;
Disconne
ct
primary
power
prior
to
servicing
.
Page 73
www.SteamPoweredRadio.Com
4-47.
ter
is
position
built
The
System
currently
42
in
limitation
will
Controller
operating
be
affected).
which
will
(e.g.
forces
adjust
if
the
It
is
MEDIUM
the
setting
transmitter
important
power
to
be
to
less
on
is
note
which
on
MEDIUM
than
that
HIGH
the
there
transmit-
power
is
power.
then
no
4-48.
the
transmitter
tion
is
the
fault
40.
discharged
.400.
transmitter
The
condition
regardless
4-49.
Position
actually
same
above
trol
the
as
with
section
air
up from
action
the
the
4-50.
at
lower
upper
to
and
can
high
lower
Now
full
display
display.
indicate
observe
position
43
it
should
nated
briefly
Position
This
pulse
of
being
position
regard
by
depressing
zero
be
power
display.
depress
power.
that
the
44
and
also
40
is
setting
by
the
width
is
in
the
indications
44
used
40 when
to a fault
of
the
to
the
observed
setting
the
While
changed
The
the
change
42
have
while
is
used
off
the
determines
power
setting
off
the
which
is
by
case
used
the
the
transmitter
LOW,
setting
with
on
the
HIGH
the
transmitter
to
.000
raise
power was
in
are
now
been
the
change
for
the
air
depressing
the
amplifiers.
will
air
except
the
of
positions
to
indicate
System
transmitter
condition
is
MEDIUM,
programmed
the
following
upper
pushbutton
and
then quickly
pushbutton
being
position
the
same.
observed
in
power was
'HV
OFF'
setting.
RAISE
rate
move
in
pulse
at
A
to
that
the
width
which
desirable
case
40-43.
the
relative
Controller
.
that
or
when
HIGH
.
is
off
Another
the
pushbuttons
earlier
sequence
display
is
to
bring
coming
and
increased
also
raised.
was
Depress
illuminated
44. Depressing
If
position
that
the
LOWER
being
In
or
LOWER
the
high
setting
set
by
position
of a potentially
setting
will
power
Normally
the
air
except
feature
of
transmitter
the
or
at
the
'*43#44'.
the
present
the
transmitter
on
the
air
to
the
'*42'
42
is
less
pushbutton
made.
other
will
affect
voltage
is
always
setting
this
will
as
the
is
power
factory.
This
power
observe
be
equal
during
MEDIUM
should
than
was
words
when
posi-
supply
.300
40
whenever
damaging
be
.000
that
be
mentioned
power
con-
brought
is
ramped
This
will
show
setting
on
the
that
to
this
time
pushbutton
show
that
position
illumi-
to
is
the
on
on
air
the
the
4-51.
pow
this
use
feature
er
During
to dri
new
the
is
level
next time
matically
existed before
special
retain
unlikely
all
ses
vents
will
rechargeable
certain
event
power
one
of
the
have to
settings
operator
the
ft
useful
return
the
be
broadcast
the
power
will
be
the
during
to
the
the
AC
maintenan
information
that
to
three
the
.000
power
from
depressed
WARNING
:
day
can
be
recorded
transmitter
a power
air
aft
failed.
ce
about
battery
and
remain off
buttons.
turning
and
held
Disconnect
if
changes
changed
by
the
is
failure
by d
System
operated
because
er a power f a
Th
is
feature
free
the
should
battery
operation
fail
the
Fai
lure
on
the
transmitter
until
the
888-2126-026
primary pow e r
in power
epressing
Controller
at
this
the
ilure
is
on
of
at
made
the
the
the System
air
until
of
the
however
correct
prior
power
to
servicing
line
voltage
RAISE
automatically
power
transmitter
the
same l
possible
System
transmitter.
Controller
the
operator
battery
the
output
.
cause
or
LOWER
level.
will
evel
by
using
Controller
will
depres-
i n no way
RAISE
is
reached.
the
and
for
This
auto-
that
to
In
the
reset
pre-
button
4-13
a
Page 74
www.SteamPoweredRadio.Com
4-52.
the
are
INTERNAL
operation
as
follows:
POSITION
POSITION
POSITION
POSITION
REFERENCES.
of
the
status
50
51
52
88
5
volt
15
volt
10.00
LAMP
There
and
power
power
volt
TEST
are 4 positions
metering
circuitry
supply
supply
reference
NOTE
output
output
for
AID
which
itself.
voltage
voltage
converter
are
concerned
These
(multimeter)
with
positions
4-53.
by
not
Position
adjustment
be
made
52
of
to
converter-automatic
meter
reads
supply
replaced.
board
volts
4-54.
display
to
segment
4-
board
less
has
and
the
TESTING
light
55.
CORRECTIVE
The +15
if
AC
for
up
does
should
that
failed
the
Controller
THE
burned
all
segments
not
When a reading
is
questionable
ence
should
automatic
ating
should
R59
read
on
the
10.
normally.
read
Status
00
calibration
be
repaired
4.
75
volts
somehow
volt
+15
power
drops
and
below
should
DISPLAY
out
SEGMENTS.
segments.
so a check
light
up
then
MAINTENANCE
observed
be
checked
calibration
10.00
and
volts
through
system
or
or
more
the
AC
supply
13,5
be
rfpaired
Depressing
that
AND
ADJUSTMENT
the
10.
volts
Multimeter
has
replaced.
than
Controller
is
also
volts
Position
can
be
LED
digit
on
the
00
volt
to
see
system
and
is
small
adjustment
failed
If
5.50
volts
board
contained
or
increases
or
replaced.
88
'#88*88'
made
for
should
PROCEDURES
display
refer-
if
the
oper-
corrections
board.
of
and
the
the
then
should
is
used
will
display
be
replaced
5
on
If
position
R59
Status
volt
the
the
to
more
to
cause
failure.
then
power
5
be
AC
test
.
can
repaired
the
be
made
52
can
the
A/D
and
Multi-
supply
volt
power
Controller
that
the
17,0
LED
display
If
any
or
4-56.
4-57
without
REPLACING
. The
the
System
PDM
PDM
Switch
Customer
Keyboard/Display
4-14
BOARDS
following
need
for
Controller
Pull
UP
Filter
board
Interface
WARNING:
AND
boards
adjustments
boards
board
Al7
board
REPLACING
may
boards
boards
Al2Al
Disconnect
BOARD
be
replaced
or
measurements:
A13
and
A14
A22
and
888-2126-026
primary
COMPONENTS
or
A23
power
prior
have
to
servicing.
components
replaced
Page 75
www.SteamPoweredRadio.Com
IPA Power
IPA
and
PA
PDM
Power
Splitter
Toroid
Filter
board
boards
board
4-58.
checked
4-59.
4-60.
scope
an
IPA
the
4-61.
The
prior
IPA
The IPA module
probe
rf
square
supply
troubleshooting
When
compound
down
the
4-62. PA
4-
63.
Refer
PHASING,
drive
usually
4-64.
pound
down
sure
amplitude
necessary
When
is
the
the
boards
to
MODULE
tip
wave
voltage
replacing
is
applied
captive
MODULE
to
and
LOW
replacing
applied
captive
RF
drive
which
turning
to
A5
at
the
.
If
section.
to
fasteners
the
procedure
VOLTAGE
on
the
to
readjust
to
the
fasteners
cable
follow
on
can
Ql2
operating
square
the
the
TESTING.
module
the
PA
mating
J2
the
be
checked
or
Ql3
IPA
mating
which
before
the
module,
which
is
fully
have
high
voltage.
while
frequency
waves
module,
heat
mou
nt
for
checking
It
turning
IPA
be
heat
mount
locked
no
adjustments,
with
only
are
not
be
sure
sink
the
IPA
is
usually
tuning.
sure
sink
surfaces.
the
into
an
oscilloscope
the
low
with
found
an
surfaces.
module
RF
DRIVE
on
the
an
even
PA
module
position
but
voltage
an
amplitude
at
Ql2
even
Be
to
the
AMPLITUDE,
advisable
high
voltage.
coating
Be
to
.
can
by
is
and
coating
certain
heat
to
of
certain
the
heat
be
partially
touching
on. Expect
equal
Ql3
of
to
to
refer
thermal
tighten
sink.
RF
DRIVE
check
thermal
It
to
the
is
com-
tighten
sink.
the
the
to
RF
not
Be
4-65.
4-66
in
4-67.
range,
Connect
A
tors.
PDM
. Check
the
correct
With
check
15
volts
The
an
away from
4-68.
VOLTAGE
4-69.
thermal
The
TESTING.
When
compound
tighten
the
heat
attaches
AMPLIFIERS
jumper
position
only
the
oscilloscope
peak-to-peak
resistors
the
output
PDM
Amplifiers
replacing
down
sink
the
the
.
PDM
plug
the
PDM
for
low
drive
P4
next
transmitter
voltage
to
across
60
kHz
listed
are
transistors.
may
the
PDM
is
applied
to
captive fasteners
Be especially
Pull
WARNING:
Up
board
Disconnect
to
the
(SX-1,
on
and
the
output
R21,
R22 , R41
pulse
should
1000 ohms , 2
be
further
Amplifier
the
mating
which
sure
to
the
to
large
888-2126-026
primary
Molex
SX-2.
a *
or
transistors
and
be
watts
checked
module,
heat
mount
tighten
capacitor.
power
prior
connector
5,
f/44
reading
of
R42
on
found
each.
using
be
sure
sink
the
the
to
surfaces.
PDM
captive
servicing
J2
SX-5).
the
the
at
The
the
procedure
an
Amplifier
.
to
in
PDM
PDM
all
ground
even
fastener
ensure
the
300-400
Amplifiers.
Amplifiers.
eight
side
for
coating
Be
certain
module
it
resis-
LOW
which
4-15
is
is
of
to
to
Page 76
www.SteamPoweredRadio.Com
4-70.
The
following
boards
require
adjustment:
4-71.
4-72.
tor
tion
4-73.
SAMPLE
output
4-74.
4-7
be
4-76.
RFI
The
level.
sample
Refer
OUTPUT
.
RF
5.
Al6Cl
adjusted
Al6R27
OSCILLATOR
oscilloscope.
age
on.
little
tions.
loss
result
Adjust
drive
Too
in
IPA
in
overworking
BOARD
only
A24
adjustments
If
the
is
not
to
the
for
trims
according
should
Connect
A16R27
to
the
much
rf
efficiency.
on
transmitter
used,
disregard
paragraph
proper
procedure
Al6
the
carrier
to a frequency
be
adjusted
an
oscilloscope
for
good,
IPA
may
result
drive
will
Excessive
of
the
Al6
the
RFI
is
located
these
entitled
to
frequency
monitoring
while
stable
in
poor
cause
considerable
output
output
board
at~
pertain
remote
adjustments.
ADJUSTING
adjust
at
the
least
observing
to
A5Ql2
class
D
class
from
stage.
to
site
THE
modulation
+20 Hz.
instrument
the
IPA
and
turn
operation
D
operation
IPA
ringing
the
Oscillator
the
modulation
where
the
MODULATION
monitor
This
or
square
only
of
should
service.
waves
the
the
or
IPA
and a slight
board
moni-
modula-
MONITOR
sample
only
on
an
low
volt-
IPA. Too
oscilla-
will
4-77.
4-78.
adjustment
may
4-79.
be
PDM
GENERATOR
If
the
should
wise
Check
transmitter
If
there
titled
where
4-80.
is
ALIGNING
in
the
Turn
approximately
power
justment
of
t r
ansmitter
to
PDM
be
to
perform
the
06-09
power
some
output
imbalance
THE
modulator
the
transmitter
970,
R28
in
DO
NOT
VOLTAGE
IF
THE
JUSTMENT
Al5
Generator
necessary
the
readings
up.
PDM
GENERATOR. A severe
system
but
do
. The
the
preceeding
ADJUST
ON.
IPA
THIS
OSCILLATES
PROCEDURE.
is
being
.
If
following
on
These
in
these
.
on
at
HIGH
not
allow
output
power
step.
Al6R27
MAY
replaced
the
PDM
alignment
the
digital
readings
readings,
power.
the
power
should
WITH
THE
ENDANGER
DURING
THE
with
Generator
procedure.
display
should
refer
imbalance
Raise
output
be
low
HIGH
THE
PA
AD-
a new
is
one,
being
after
agree
to
within
the
may
the*
to
or
exceed
as a result
very
repaired,
bringing
2-3
paragraph
be a fault
#44
reading
the
of
little
volts.
else-
rated
the
it
the
en-
to
ad-
4-16
WARNING
:
Disconnect
888-2
prima
126-026
ry
power
prior
to
servicing.
Page 77
www.SteamPoweredRadio.Com
4-81.
DIRECTIONAL
COUPLER
Al8
4-82.
DIRECTIONAL
Refer
to
COUPLER.
placing a diode.
4-83.
4-84.
ANGLE
4-85.
4-86.
repaired,
voltage
4-87.
meter
necting
4-88.
PHASE
Refer
ANGLE
to
DETECTOR.
AC
CONTROLLER
When
installing
there
.
CHECK
board
P14
THE 5 VOLT
Al2.
will
Connect a
the
procedure
Readjustment
DETECTOR
procedure
No
adjustment
BOARD
a new
are
a few
This
take
de
is
the
voltmeter
described
A27Al
given
should
A25
AC
checks
SUPPLY.
the
cable
load
off
between
should
in
paragraph
be
Controller
that
can
Disconnect
that
of
the 5 volt
Pl4-3
in
paragraph
not
required
board
be
P14 from
supplies
(wire
entitled
be
necessary
entitled
when
or
replacing a diode.
one which
made upon
the
5
volts
supply.
#63)
and
ADJUSTMENT
when
ADJUSTMENT
has
just
application
Status
to
and
Al2.
ground.
only
OF
PHASE
of
Multi-
Discon-
OF
re-
been
low
IN
THE
FOLLOWING
SET
THE
LOW
ON
TO
MINIMIZE
DAMAGING
ON
THE
LEAVE
ON
FOR
PROBLEM
SUPPLY.
ANY
OF
CONTROLLER
DO
NOT
MITTER
HAS
FILTER
THE
AC
THE
MORE
EXISTS
IF
THE
APPLY
UNTIL
BEEN
CAPACITORS
STEPS
VOLTAGE
CIRCUIT
THE
+5
VOLT
CONTROLLER
LOW
VOLTAGE
THAN
ANY
FILTER
BOARD
LOW
THE
5-10
IN
THE
ODOR
CAPACITORS
APPEAR
VOLTAGE
CAUSE
DETERMINED
HAVE
ONLY
MOMENTARILY
POSSIBILITY
FILTER
BOARD.
CIRCUIT
SECONDS
+5
VOLT
IS
OBSERVED
TO
BE
TO
OF
THE
AND
THE
BEEN
REPLACED
BREAKER
TO
OF
COMPONENTS
NEVER
BREAKER
IF
A
POWER
OR
IF
ON
THE
AC
DAMAGED,
THE
TRANS-
DAMAGE
DAMAGED
,
WARNING:
888-2126-026
Disconnect
prima
ry
pow
er
prior
to
servicing.
4-17
Page 78
www.SteamPoweredRadio.Com
4-89.
the
voltage
paragraph
Momentarily
at
Pl4-3
entitled
set
the
LOW
VOLTAGE
would
TROUBLESHOOTING
be
about 6 volts.
A 5
circuit
VOLT
If
SUPPLY
breaker
it
is
FAILURE.
to
not,
ON.
refer
Normally,
to
the
4-90.
ning
4-91.
4-92.
cathode
the
troller
4-93.
they
nearly
which
obtained
plished
paragraph
4-94
may
4-95.
4-96.
faster
set
Plug
Al2Pl4
properly.
The
digital
CHECK
of
anode
board
All
are
PLUS
CR12
of
CR15.
schematic
new
shipped.
calibrated.
are
wired
by
including
by
following
entitled
.
In
general,
affect
meter
STATUS
AND
Replacement
and
smoother
using a volt/ohmmeter.
back
display
AND
MINUS
on
the
AC
If
troubleshooting
and
boards
PA
are
VOLTS,
Being
into
the
these
the
METER
readjustment
calibration
MULTIMETER
of
the
if
the
in
when
should
15
it
then
VOLTS.
Controller
check
.:!:_30
tested
PA
AMPS,
that
these
transmitter
elements
meter
calibration
CALIBRATION
should
is
replaced.
BOARD
Status
Al2
and
calibration
is
determined
light
+15
board.
is
necessary,
volts
and
going
calibrated
and
supply
metering
cabinet,
in
the
PROCEDURE.
be
made
Multimeter
and
overload
the 5 volt
up.
volts
-15
to
should
volts
the
in
current
circuits
exact
calibration
calibration.
procedures
whenever
board
potentiometers
be
should
refer
to
board.
a
transmitter
metering
consist
This
beginning
a component
may
be
supply
found
be
the
is
at
found
AC
before
will
of
elements
can
only
is
accom-
with
accomplished
are
run-
the
at
Con-
be
be
the
which
pre-
4-97.
this
all
when
4-98.
record
on
the
4-99.
4-100.
and
record
makes
of
eight
4-18
A
digital
task
since
the
If
the
the
front
keypad
Turn
With
the
the
measurements
blue
multimeter
the
final
high
voltage
transmitter
panel
.
transmitter
only
the
voltages
calibration
BE
CAUSE
BOARD
rather
objective
is
on.
is
operational,
PA
VOLTS,
off
.
transmitter
on
the
following
much
easier.
potentiometers
CAREFUL
DAMAGE
IF
IC
PINS
than
is
PA
CURRENT,
low
The two
IN
MEASURING
CAN
OCCUR
ARE
888-2126-026
an
analog
to
make
set
FORWARD
voltage
IC
pins.
IC's
on
the
VOLTAGES
TO
IC' S ON
SHORTED
meter
little
it
to
or
its
POWER,
circuit
Use
are
breaker
of
located
board.
BE-
THE
TOGETHER.
is
no
normal
and
an
IC
best
suited
adjustment
power and
#44
position
on,
pin
extender
under
to
at
measure
the
row
WARNING: Disconnect
primary
power
prior
to
servicing.
Page 79
www.SteamPoweredRadio.Com
4-101.
Measure
and
record
the
following
points
to
ground:
OVERLOAD
Overvoltage
PA
Current
Underdri
Overdrive
Power
Phase
Directional
Reflected
ve
Supply
Angle
Current
VSWR
Coupler
Power
SHUT
WITH
ADJUSTMENT
R55
R57
R58
R56
R54
R53
R51
OFF
ALL
THE
FOLLOWING
WARNING
AC
POWER
STEPS.
IC
U44
U44
U44
U44
U45
U45
U45
I
BEFORE
PIN
7
5
10
9
11
5
6
PROCEEDING
VOLTAGE
MEASURED
4-102.
Multimeter
and
measurements.
4-103.
connector
ometer
possible.
4-104.
even
There
pin
the
Pins
Shut
board.
set
it
Use
pin
settings
All
numbered
should
1.
The
connector.
4,
6,
8,
METER
PA
REFLECTED
FORWARD
AFFECTED
CURRENT
off
on a
the
ohmmeter
numbers.
of
of
the
pins
be
an
next
POWER
pins
On
etc.
POWER
all
If
piece
the
ribbon
on
arrow
the
will
ac
power
desired,
of
to
These
new
connectors
the
in
would
other
then
and
remove
totally
cardboard
measure
will
board.
other
one
be
3,
side
be
ADJUSTMENT
R60
R61
R62
side.
corner
5,
down
determine
have
7,
the
this
all
remove
on
a
table
the
resistance
Read
the
odd numbered
Look
on
the
etc.
pin
down
opposite
side
MEASUREMENT
J4-4
J4-8
J4-14
plugs
the
board
for
the
meter
resistance
at
one
outside
the
of
the
and J9-8
and
Jll-17
and
from
from
making
between
calibration
pins
of
the
. The
length
pin
1 would
connector.
BETWEEN
Jll-15
the
the
as
on
ribbon
of
Status
transmitter
the
following
the
following
potenti-
critically
one
side
cables.
arrow
this
denotes
side
be
pin
RESISTANCE
and
as
and
of
2.
PA
VOLTAGE
WARNING:
R63
Disconnect
J4-2
888-2126-026
primary
power
and
prior
J9-14
to
servicing.
4-19
Page 80
www.SteamPoweredRadio.Com
4-105.
meter
the
same
Make
board,
values
the
but
same
adjust
as
recorded
resistance
the
meter
previously.
measurements
calibration
on
the
new
potentiometers
Status
and
Multi-
(R60-R63)
to
4-106.
tors
4-107.
is
fault
Install
in
place.
Turn
illuminated
light
on
may
showing. Thisis
display.
System
4-108.
If
it
4-109.
should
4-110.
load
will
ensure
4-111.
power
displayed
stabilize
FORWARD
Also
Controller
Depress
is
off,
set
Depress
read
approximately
Using
potentiometers
the
Once
this
level.
number
for
POWER
should
the
new
the
low
and
is
displaying
be
illuminated
normal
check
to
boards.
#52
on
the
it
to
10.00
#50
and
the
table
to
the
overloads
is
completed,
Display
the
/144
same
approximately
be
equal
Status
voltage
at
this
see
digital
#51.
15V.
where
same
are
and
as
and
Multimeter
and
check
O's
at
this
time.
that
the
display.
with
R59
Number 50
overload
voltages
set
to
the
bring
use
the
recorded
five
to
minutes.
the
readings
to
in
the
Key*
time
and
Otherwise
green
on
the
should
voltages
as
same
the
transmitter
RAISE-LOWER
previously.
The
board
make
sure
and
there
there
LED's
This
should
Status
read
were
recorded
threshold
PA
first
recorded.
and
fasten
the-digital
Key#
may
are
positions.
be a fault
will
be
illuminated
read
and
Multimeter
approximately
recorded,
in
that
as
on
the
power up
pushbuttons
Let
the
VOLTS,
PA
all
connec-
display
O's
in
on
10.00
board.
5V
and
set
the
table.
old
board.
to
the
to
make
transmitter
CURRENT,
The
number
the
both
+.OlV.
#51
over-
This
normal
the
and
4-112.
tion
may
procedures
be
necessary,
bration
4-113.
4-114.
operating
frequency
the
set
the
instructions
4-115.
the
Frequency
If
the
meter
in
the
especially
potentiometers.
Be
switch
mal
SETTING
The
over
source
frequency
UP
THE
Frequency
the
is
first
for
SETTING
THE
Synthesizer
readings
appear
paragraph
if
sure
to
to
the
transmitter
OPTIONAL
Synthesizer
entire
AM
broadcast
programmable
select
programming
BAND
SWITCHES.
board
questionable,
entitled
an
analog
NOTE
place
proper
operation.
FREQUENCY
in
the
from
the
the
the
proper
frequency of
Located
is
a
four
METER
meter
the
position
CALIBRATION
is
REMOTE-LOCAL
for
SYNTHESIZER
SX-1
band
Keypad
band
transmitter
(525
on
for
operation.
within
pole
dual
follow
used
kHz
the
to
nor
-
to
pull-out
operation
the
VCO
in-line
the
meter
PROCEDURE.
preset
is
capable
1605
kHz).
drawer.
and
then
(copper
switch
calibra-
the
follow
box)
Sl.
This
cali-
of
This
To
on
Sl
4-20
WARNING:
Disconnect
888
- 2126- 026
primary
power
prior
to
servicing
.
Page 81
www.SteamPoweredRadio.Com
must
three
be
bands
525
801
1176
set
to
as
kHz
kHz
kHz
the
correct
follows:
to
800 kHz
to
1175 kHz
to
1605
Sl
ment
in
Frequency
kHz
can
the
band
be
tool
copper
Synthesizer
for
reached
through
cover
the
frequency
S1
and
S2
and
and
S3
S3
Sl
S2
NOTE
with a small
the
rectangular
over
the
board.
open
open
open
VCO
of
operation.
S3
closed
S2
closed
S1
closed
adjust-
hole
on
the
There
are
·~
4-116.
using
PROGRAMMING
the
example:
To
display
The
entering
operation
be
blanked.
repeat
other
4-
117.
the
key
To
Synthesizer
Frequency
Key
THE
FREQUENCY
special
key
code
obtain a frequency
will
the
at
procedure.
code
last
1000
If
(i.e.
echo
digit
kHz
an
4
all
and
error
To
*45).
digits
quency;
*950610.
check
use
Synthesizer
in
the
the
the
frequency
key
code
lock
following
95
the
the
the
is
exit
are
e.g.
45
detect
- #45
SYNTHESIZER.
followed
of
1000 kHz
digits
depressed
Frequency
digits
detected
the
NOTE
required
610
that
to
view
signal.
by
the
key
Synthesizer
that
were
while
frequency
to
kHz
is
is
the
For
The
frequency
frequency
in
*951000
on
the
will
entered
entering
entry
set
the
entered
programmed
frequency
example:
upper
in
the
mode
fre-
as
into
and
is
in
kilohertz.
display
be
programmed
the
frequency
simply
the
the
status
programmed
and
display
simply
enter
Frequency
of
For
upon
for
will
any
the
display
The
status
of
frequency,
locked
some
in
a
conditions
and
locked
the
out
condition
will
the
lock
the
display
of
lock
show
detect
display
will
of
unlocked
causing
is
established.
WARNING:
the
signal.
will
show
the
Disconnect
frequency
If
show
the
the
frequency
operation
display
888-2126-026
primary
followed
the
Frequency
frequency
attempted
the
status
to
rapidly
power
by a
followed
signal
change
prior
decimal
Synthesizer
followed
will
from.Oto
to
servicing
point
by .O
by
temporarily
.
is
and
.F.
and
locked
if
During
.F
until
the
on
un-
go
4-21
Page 82
www.SteamPoweredRadio.Com
NOTE
4-118.
4-119.
000
4-120.
Generator.
the
4-121.
U9-9
4-
122.
printed
kHz
ALIGNING
Turn
using
Verify
photos
Use a
and
Connect
circuit
pulses.
the
the
The
at
Ul0-9.
4-123. 'Adjust
counterclockwise
The SX-1
components
Network
These
if
changed.
THE
transmitter
LOWER
the
existence
triangle
the
end
digital
an
oscilloscope
board.
R98
in a clockwise
until
and
components
the
frequency
PDM
GENERATOR
pushbutton.
waves
of
Section
voltmeter
Set
the
the
pulses
uses
in
Modulation
on
at
of
triangle
should
V.
to
to
oscilloscope
direction
just
frequency
the
IPA,
may
need
of
the
LOW
power.
look
verify
the
side
disappear.
PA's,
Monitor
to
transmitter
waves
very
that
of
to
until
determinant
Output
Sample.
be
changed
Lower
at
the*
U9-9
linear,
there
R46
is less
nearest
measure
pulses
is
and
as
15
appear.
or
#44
Ul0-9
those
than
the
volts
reading
on
shown
10
edge
p-p
Rotate
the
mVdc
of
of
to
PDM
in
at
the
60
R98
~ -
4-124.
very
narrow
125.
4circuit
ceeding
4-126.
4-127.
reading
1100
R28
watts
in
4-128.
highest
For
example
R28
for
4-
129.
agree
not,
make a
Depress
Move
board
step,
Rotate
Turn
to
the
Adjust
normal
1000
Check
with
the
RAISE
pulse
will
the
oscilloscope
edge
is
observed
R28
the
transmitter
.
several
approximately
The
output
preceeding
R28
on
power
if
1000
watts
watts.
the*
each
slight
or
other
readjustment
not
Adjust
(should
970,
power
step.
the
the
transmitter
#06-09
and
pushbutton
reach
15
probe
R14
until
be
turns
counterclockwise
on
at
but
should
PDM
Generator
is
the
transmitter
readings
with
the
of
Rl4.
until
volts
to
the
a
of
the
HIGH
do
power.
not allow
be
low
will
on
PA
voltmeter
a
very
p-p
.
side
very
same
of
narrow
amplitude).
.
Raise
the
as a result
to
produce
operate
normal
the
digital
narrow
R45
pulse,
or
power
1100
at,
high
display.
within
pulse
nearest
as
lower
output
of
the
watts
whichever
power
2
or
appears.
the
printed
in
the
the*
to
or
exceed
adjustment
or
to
is
lower.
level,
These
3
should
volts.
A
pre-
#44
to
the
set
If
4-22
WARNING:
Disconnect
888-2126-026
primary
power
prior
to
servicing.
Page 83
www.SteamPoweredRadio.Com
~.
4-130.
desired
Switch
low
power
to
setting
LOW
power
is
and
reached.
depress
the
RAISE
pushbutton
until
the
4-131.
-10
dBm
4-132.
affect
4-133.
or
//44
charges
4-134.
4-135.
board
R21
should
and
+10
R30
should
noise
Turn
reading
ADJUSTMENT
The
for
the
proper
when
the
HV
following
be
set
dBm.
be
adjusted
adjusted
transmitter
to
300-400.
following
OF
DIRECTIONAL
procedure
operation.
This procedure
mainder
the
transmitter
and
only
adjustment.
Output
section
first
procedure.
for
to
extremes.
off
This
an
OFF
of
the
Network
on
before
the
desired
to
minimize
and
set
determines
command.
COUPLER
can
be
NOTE
assumes
the
Output
is
Directional
If
other
need
Output
beginning
audio
120
(with
the
used
to
that
Network
properly
Coupler
portions
adjustment
Network
input
Hz
noise.
the
LOWER
rate
adjust
the
within
adjusted
of
see
adjustment
with
sensitivity
at
the
Directional
re-
needs
the
the
this
R30
should
pushbutton)
which
the
between
always
the
PA
dis-
Coupler
*
Ensure
a.
b.
Disconnect
Coupler
c.
Connect a Vector
post
d.
Adjust
impedance
the
transmitter
at
that
the
ENSURE
MITTER
BEEN
P
USED
OTENTIAL
BEFORE
the
which
the
the
connects
rear
front
reading
transmitter
WARNING
ALL
POWER
AND
THAT
TO
DISCHARGE
WHERE POWER HAS BEEN
PERFORMING
strap
for
from
the
Impedance
of
the
ground.
panel
of
50+j0
888-2126-026
is
connected
IS
REMOVED
GROUNDING
THE
FOLLOWING
the
post
Directional
Meter
Directional
LOADING
on
the
I
FROM
STICK
ANY
or
impedance
RESIDUAL
STEPS.
at
the
Coupler
other
Coupler
and
APPLIED
TUNING
to a 50
TRANS-
HAS
rear
of
to
Impedance
using
controls
bridge.
ohm
the
L2.
the
dummy
Directional
Bridge
roof
for
load.
to th
top
4-
e
of
an
23
WARNING: Disconnect primary
power
prior
to
servicing.
Page 84
www.SteamPoweredRadio.Com
e.
Reconnect
f.
Adjust
least
sing
triggered.
g.
Bring
h,
Observe
meter.
Directional
accessed
right
capacitor
i,
Increase
station
ammeter
calorimetric
j.
Adjust
k.
Turn
the
R51
on
12
turns
circuit
the
transmitter
the
forward
If
there
Coupler
through
side
near
closest
power
monitoring
connected
dummy
C9
to
minimize
transmitter
strap
the
Status
to
desensitize
registers
is
a
hole
the
to
of
transmitter
in
load,)
off
removed
and
a
on
the
and
reflected
significant
to
minimize
in
rear
the
of
front
equipment.
series
reflected
and
wait
in
step
Multimeter
the
'32'
air
on
at
indications
reflected
the
the
roof
the
cabinet.
of
the
to
full
(Typically
with
power
for
power
b,
board
VSWR
overload.
the
50%
of
reflected
of
transmitter.
power
the
50
as
in
to
(A12)
digital
rated
on
power
power.
the
transmitter
C9
as
a
ohm
step
decrease
The
display
power.
the
adjust
is
the
indicated
calibrated
dummy
h,
above.
to
clockwise
VSWR
front
C9
C9
panel
on
can
on
adjustable
by
load
zero
or
.
at
sen-
when
the
be
the
the
RF
a
1.
Note
Coupler.
of
plugs
plugs
they
m,
Bring
Status
cates
n.
Switch
not
forward
transmitter
is
Recheck
using
ATTEMPTING
ON
TIONAL
DEVELOP
which
the
cabinet
are
and
were
transmitter
and
the
to
zero,
power.
the
adjustable
reflected
R61
MAY
RESULT
COUPLER
WHEN
way
plugs
These
plugs
on
connected
insert
in.
Multimeter
correct
forward
adjust
C2
on
the
on
Status
STEP
IN
THE
P2
can
the
right
side
them
on
at
the
board
power
power
C2
on
can
right
capacitor
power
and
1.
WITH
DAMAGE
BECAUSE
PLUGS
and
P3
be
ARE
reached
side
by
side
90
degree
air
at
so
output
and
for
observe
the
be
accessed
side
near
closest
calibration
Multimeter
THE
TRANSMITTER
TO
THE
AN
ARC
REMOVED.
are
installed
through
near
in
the
two
angles
full
power
that
the
the
transmitter
the
Directional
through
the
to
and
board.
DIREC-
MAY
rear,
sockets.
to
and
reflected
indication,
Coupler
rear
the
of
rear
adjust
in
a
hole
the
adjust
the
the
of
the
Directional
in
Notice
Remove
positions
R61
position
,
to
roof
cabinet,
the
if
the
top
that
the
both
that
on
the
indi-
If
it
is
minimize
of
the
C2
cabinet.
necessary
4-24
WARNING:
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888-2126-026
primary
power
prior
to
servicing
.
Page 85
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o.
Switch
to
LOW
power
and
set
NOTE
output
power
at
90
watts.
p.
Adjust
the
output
power
display
q.
Turn
This
protection
r.
Reconnect
before
The power
will
position
R51
on
VSWR
protection
will
level.
position
transmitter
will
take
and
ATTEMPTING
ON
MAY
TIONAL
DEVELOP
the
step
be
at
Status
be
A
longer
is
RESULT
COUPLER
WHEN
plugs
1.
output
indicated
this
and
takes
fluttering
'32'
00 . The
off
and
that
normal
STEP
IN
THE
on
of
on
time.
Multimeter
effect
at
will
be
OFF/FAULT
wait
normal
.
r.
WITH
DAMAGE
BECAUSE
PLUGS
the
ARE
Directional
the
transmitter
the
board
.
PA
some
amount
registered
lamp
for
due
THE
TRANSMITTER
TO
THE
AN
REMOVED
reflected
VOLTS,
should
power
to
the
DIREC-
ARC
.
Coupler
counterclockwise
PA
below
in
to
decrease
effects
AMPS,
the
the
be
and
normal
FAULT/
illuminated.
to
of
MAY
the
way
they
STAT
the
until
POWER
set
US
zero.
VSWR
were
4-136.
4-137.
s .
Turn
t.
Adjust
power
u.
Transmitter
ADJUSTMENT
the
R62
meter
OF
This procedure
transmitter
on
the
indicates
is
now
PHASE
can
ANGLE
be
back
Status
the
ready
DETECTOR
used
to
on
and
power
for
adjust
at
full
Multimeter
measured
operation.
the
power.
board
in
Phase
step
Angle
until
1.
Detector
the
forward
board.
WARNING:
Disconnect
888-2126-
primary
026
power
prior
to
servicing.
4-25
Page 86
www.SteamPoweredRadio.Com
NOTE
This
remainder
the
and
adjustment
Output
section
first
dure.
just
the
quency
installed.
ENSURE
MITTER
BEEN
POTENTIAL
BEFORE
procedure
transmitter
only
Network
before
Also,
gone
field,
determined
ALL
AND
USED
PERFORMING
of
the
Phase
.
If
on
Output
beginning
through
insure
POWER
THAT
TO
WHERE
assumes
the
Output
is
Angle
other
need
if
WARNING
adjustment,
Network
the
a
frequency
that
components
IS
REMOVED
GROUNDING
DISCHARGE
POWER
THE
that
Network
properly
Detector
portions
adjustment
with
this
transmitter
change
the
proper
have
I
FROM
STICK
ANY
HAS
BEEN
FOLLOWING
the
within
adjusted
needs
of
the
see
the
proce-
has
in
frebeen
TRANS-
HAS
RESIDUAL
APPLIED
STEPS.
a.
With
Phase
connector
b.
Connect
the
RMS
c.
Adjust
a minimum. At
required.
d.
Reconnect
close
e.
Bring
full
(displayed
until
f.
Key
pull-out
g.
"Refer
Factory
need
the
transmitter
to
power.
in
to
TRANSMITTER
Angle
JZ
CZ
the
the
it
the
the
Detector
.
an
RF
and
(middle
Jl
and
door
main power up
If
as
stops.
following
drawer
reading
Test
be
adjusted
Data
signal
and
connect
capacitor)
this
J2
of
the
the
'64'
'*20'
in
Sheets.
POWERED
noting
generator
adjusted
an
RF
voltmeter
point
to
transmitter.
Phase
on
sequence
and
step
until
there
the
same
on
the
Angle
FAULT/STATUS
note
f.
If
the
OFF
disconnect
which
tuned
for
a
until
the
the
is
BNC
transmitter
Detector
on
the
reading
to
that
the
reading
reading
cable
level
to
no
connectors
position
connects
to
the
between 1 and
Jl.
voltage
further
and
overload
Keypad on
(.01
which
is
is
nulled.
Jl
and
carrier
measured
adjustment
as
increase
00)
the
typical).
is
recorded
higher,
J2
to
which
frequency
in
step
output
is
recycling
decrease
front
Cl
Cl
and
from
10
on
of
a.
of
on
and
C3
the
BNC
of
volts
Jl
is
CZ
and
to
power
the
the
CJ
can
4-26
WARNING:
Disconnect
888-2126-026
primary
power
prior
to
servicing.
Page 87
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only
TRANSMITTER
then
be
turned
adjusted
MUST
back
BE
on
with
TURNED
after
WARNING
the
OFF
closing
rear
BEFORE
the
I
door
ADJUSTING
rear
door.
open,
therefore
Cl
OR
C3
the
and
4-138.
4-139.
replaced
h.
Since
must
interaction
first
i.
Once
close
complete.
OUTPUT
The
Output
.
If
ENSURE
MITTER
BEEN
POTENTIAL
BEFORE
both
both
and
the
to
the
NETWORK
Network
this
occurs
THE
MEASURED
CLOSED.
MATELY
DOOR
ALL
AND
USED
PERFORMING
Cl
and
be
adjusted
between
then
reading
the
Factory
COLD
TUNING
should
ensure
RESONANT
ONLY
A
4
IS
OPEN.
POWER
TO
WHERE
other.
on
FREQUENCY
KHZ
IS
THAT
DISCHARGE
POWER
THE
C3
affect
for
the
position
Test
require
that
FREQUENCY
WHEN
WILL
REMOVED
GROUNDING
HAS
FOLLOWING
the
best
two
controls
Data
the
following
OF
THE
SHIFT
BE
FROM
ANY
BEEN
reading
null;
20
is
Sheet
retuning
L2-C2
REAR
OF
NOTED
TRANS-
STICK
RESIDUAL
APPLIED
STEPS.
however,
so
nulled
reading,
only
caution
MUST
DOOR
APPROXI-
WHEN
HAS
on
one
and
BE
IS
THE
position
there
may
be
is
equal
the
adjustment
if
a component
note
is
20,
is
minimum
adjusted
to
followed.
they
or
is
is
4-140
Output
attempted
to
. The
cold
Network.
tune
following
the
in
the
WARNING
ENSURE
FROM
USED
RF
POWER
CEEDING
paragraphs
All
voltage
Output
presence
WARNING
ALL
TRANSMITTER
TO
Network.
:
Disconnect
VOLTAGE
GROUND
HAS
WITH
THE
must
of
an
ALL
BEEN
describe
be
Tuning
rf
888-2126-026
primary
I
HAS
AND
GROUNDING
POINTS
APPLIED
FOLLOWING
a
removed from
the
field
on
power
BEEN
WHERE
PROCEDURE.
cold
REMOVED
STICK
BEFORE
tuning
the
Output
or
near
prior
to
AC
PRO-
Network
the
servicing
IS
OR
procedure
transmitter
should
frequency
.
for
in
order
not
of
the
be
the
4-27
Page 88
www.SteamPoweredRadio.Com
transmitter.
standby
adjacent
For
transmitter
frequency
example,
is
on.
will
make
the
procedure
The
achieving
presence
the
for
of
proper
set
an
adjustment
up
rf
cannot
field
be
on
very
used
the
same
difficult.
while
a
or
4-141.
the
the
4-142.
the
THIRD
strap
third
Adjust
carrier
impedance
between
4-143.
used
with
a
low
where
4-144.
input
4-145.
17
Resonance
with
the
capacity
the
BANDPASS
side
Disconnect
enclosure
-146.
4
Connect
impedance
Directional
HARMONIC
which
harmonic
17
frequency.
meter,
and
ground
an
oscilloscope
RF
signal
probe
amplitude
(towards
containing
measuring
Coupler
TRAP
goes
trap
for
to
A21L7,
circuit
resonance
This
or
may
any
near
also
suitable
A21C4.
be
and a resistor.
going
on
to
to
the
the
oscilloscope
FILTER L2-C2.
rear
the
an
device
and
strap
A21Ll
RF
bridge,
ground.
of
transmitter)
and
between
L7-C4.
the
from
(minimum
may
determined
the
trap
trap
Disconnect
which
A21Cl.
vector
Disconnect
third
the
rest
be
accomplished
impedance
circuit.
coil.
is
of
connects
impedance
the
strap
from
harmonic
of
the
impedance)
measuring
with
Put
a
variable
a
!Ok
Connect
Resonance
minimum.
the
strap
the
Directional
to
the
which
the
loading
coil.
Output
at
the
with
an
ohm
the
occurs
which
feedthrough
meter,
was
disconnected
coil
This
will
Network.
third
rf
harmonic
bridge,
device
RF
genera
resistor
oscilloscope
at
the
connects
Coupler.
bolt
or
any
(A21L5)
separate
vector
connected
tor
when
in
series
with
frequency
to
the
on
the
suitable
from
the
of
4-147.
L2-C2
frequency.
loosen
4-148.
the
be
4-149.
4-150.
back
set
mounting
Due
to
At
TEE
Directional
enclosure
is
set
Adjust
12
hardware
THE
MEASURED
CLOSED.
IMATELY
DOOR
to
the
close
door
closed
resonance
no
resonance
NETWORK -LOAD
Coupler.
should
still
for
by
rotating
in
RESONANT
IS
proximity
for
reading
more
the
impedance
The
be
disconnected.
resonance
order
to
FREQUENCY
ONLY
A
4
WHEN
FREQUENCY
KHZ
WILL
OPEN.
the
than 2 kHz
AND
TUNE.
strap
(maximum
the
entire
accomplish
THE
BE
of
the
exact
from
of
L2-C2
Connect
to
the
coil.
this.
OF
L2-C2
REAR
SHIFT
OF
NOTED
back
door,
resonance
carrier
is
2500 ohms
feedthrough
impedance)
It
will
MUST
DOOR
BE
IS
APPROX-
WHEN
it
of
THE
is
L2-C2.
frequency.
or
L2-C2
to
bolt
at
the
be
necessary
necessary
L2-C2
more.
the
input
on
the
carrier
to
have
should
of
the
Ll-Cl
to
4-28
WARNING:
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888-2126-026
primary
power
prior
to
servicing.
Page 89
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4-151.
(towards
Connect
front
the
RF
of
transmitter).
bridge
to
the
output
end
of
the
Directional
Coupler
4-152.
4-153.
PA
impedance,
4-154.
loading
4-155.
operate
frequency
4-156.
4-157.
meters
each
removing
mechanical
Adjust
L2
module.
Sliding
of
Ll
into.
METER
MECHANICAL
by
meter.
TUNING
SLIDING
The
with
and
unplugging
the
the
the
the
PA.
TAP.
The
performan
CALIBRATION
Access
dress
zero
of
and
Refer
data
TAP. The
impedance
Ll
on
resistive
tap
towards
sets
PA
normally
ce
ZEROING.
J4
from
to
the
panel.
the
meters
LOADING
to
impedance
that
the
related
PROCEDURE
Be
for
factory
tap
on
the
part
the
reactive
sees a reactance
conditions
Check
the
Status
mechanical
sure
.
50 ohms jO
NOTE
test
of
12
L2
is
PA
being
the
approximately
ground
component
mechanical
to
plug
at
this
data
and
set
module
end·
.
and Multimeter
zero
sheet
Ll.
for
the
operates
of
12
that
of 1 to
zeroing
adjustments
J4
back
point.
for
correct
into
7 ohms.
will
the
5 ohms
of
board
may
in
after
loading
result
PA
modules
the
is
a
complex
in
heavier
depending
front
and
examining
be
gained
checking
of
the
should
on
panel
by
the
4-158.
covered
4-159.
setting(*
low
4-160.
4-161
board
board,
adjustment.
c
ounterclockwise
recheck
FORWARD/REFLECTED
in
paragraph
PA
VOLTS.
or#
power.
The
.
If
the
will
all
power
the
on
ADJUSTMENT
Turn
44)
front
have
electrical zero
panel
IF
RE
TRANSMITTER
PA
VOLTS
to
will
Adjusting
moves
the
to
000.
PA
ACCESS
QUIRED, REMOVE
does
be
adjusted
have
R22 clockwis
the
POWER.
transmitter
Turn
VOLTS
TO
BEFORE
not
. Due
to
be
meter
with
Calibrat
OF
DIRECTIONAL
transmitter
reading
WARNING
THE
ALL
ATTEMPTING
r e
ad exactly
to
removed
e moves
pointer
the
high
i on
of
on
at
low
off
should
I
AC
CONTROLLER
POWER
zero,
the
location
from
downscale.
voltage
transmitter
the
the
COUPLER.
power
and
read
exactly
FROM
ACCESS.
R22
meter
Adjust
on
and
power
then
THE
pointer
output
and
lower
back
zero.
IS
on
the
of
the
before
R22
a 000 power
the
on
AC
Controller
AC
Controller
making
up
scale and
slightly
meter
power
again
setting.
is
at
the
and
WARNING:
Disconnect
888-2126-026
primary
power
prior
to
servicing
4-29
.
Page 90
www.SteamPoweredRadio.Com
4-162.
shut
After
the
transmitter
correct
electrical
off.
zeroing
of
the
PA
VOLTS
meter
is
achieved,
4-163.
differential
high
it
can
4-164.
following
4-165.
access
the
holes
allow
4-166,
appropriate
side).
be
holes
tran
located
access
In
Route
The
smitter
The
the
following
between
Place
read
accurately.
the
paragraphs.
voltmeter leads
and
by
in
into
voltmeter
connections.
the
the
ENSURE
TRANSMITTER
THE
voltmeter
up
through
sliding
the
the
main
procedure
PDM
DC
Voltmeter
ALL
LEADS
upper
enclosure.
leads
IN
leads
may
the
the
right
may
Filter
WARNING
POWER
BEFORE
THE
inside
be
Remote
drawer
hand
have
a
DC
Voltmeter
outputs
outside
of
I
IS
REMOVED
ATTEMPTING
FOLLOWING
to
the
routed
out
to
through
Wiring
and
side
be
extended
(PA
low
the
cabinet,
FROM
TO
STEPS.
connections
grommet
routing
of
the
is
used
side)
THE
ROUTE
one
or
the
drawer
in
and
positioned
described
of
the
from
wiring
enclosure
order
to
the
to
measure
the
B+
in
bottom
front
through
reach
the
(PA
where
the
side
of
the
which
------..,,
the
4-167.
(260V)
4-168.
output
4-169.
transm
4-170.
meter
4-171.
cabinet.
Connect
connection
Connect
E42.
Close
itter
agree
on
Adjust
with
Remove
the
positive
on
the
the
negative
the
at
R63
rear
LOW,
on
the
DC
ENSURE
TRANSMITTER
THE
all
power
PA
Module
lead
door
MEDIUM
the
Status
Voltmeter
ALL
LEADS
IN
from
lead
or
of
Al
of
and
HIGH
and
reading.
WARNING
POWER
BEFORE
THE
FOLLOWING
transmitter
an
accurate
(the
large
the
voltmeter
return
power
Multimet
power
level.
er
I
IS
REMOVED
ATTEMPTING
STEPS.
and
DC
red
plug
to
to
board
FROM
TO
REMOVE
remove
Voltmeter
J3).
the
PDM
transmitter.
to
make
THE
voltmeter
to
Filter
the
leads
the
PA
B+
board
Bring
VOLT
from
4-30
WARNING:
Disconnect
888-
prima
2126-026
ry
power
prior
to
servicing
.
Page 91
www.SteamPoweredRadio.Com
4-172.
setting(*
4-
173.
PA
The
AMPS.
or
#44)
PA
AMPS
Switch
to
000.
meter
the
should
transmitter
read
on
exactly
at
zero.
low
power
and
lower
the
power
,,,..,..---.
,
4-174.
adjust
4-175.
board
troller
making
with
in
the
age
is
wiring
4-176.
turn
IF
R3
If
will
board,
the
the
high
PA
applied,
near
After
the
transmitter
PA
AMPS
on
the
AC
the
PA
have
adjustment.
current
voltage
the
correct
to
all
it
PA
meter
Controller
IF
REQUIRED,
TRANSMITTER
AMPS
meter
current
ACCESS
does
be
adjusted
power
on
may
electrical
off
does
not
will
Adjust
and
reading
indicate
shunt
and
open
not
read
board
WARNING
TO
THE
REMOVE
BEFORE
read
. Due
have
R3
slightly
a 000
is
obtained
a
problem
(A19R5) .
zeroing
the
WARNING
exactly
A25.
I
AC
CONTROLLER
ALL
ATTEMPTING
to
power
back
POWER
exactly
to
the
be
setting
of
door.
removed
and
when
on
I
zero,
ACCESS.
zero,
limited
recheck
the
the
PA
it
FROM
R3
from
.
If
the
AC
AMPS
will
THE
on
access
a
transmitter
Controller
be
IS
the
of
transmitter
the
electrical
substantial
meter
necessary
AC
Controller
the
high
or
is
achieved,
AC
Con-
before
zero
change
volt-
in
to
the
177.
4and
through
4-178.
sure
not
capable
4-179. If
Also
insulation.
4-180. Turn
power
rent
Locate a DC
route
the
The
the
external
short
meter.
to
of
note
has
been reached
its
leads
Remote
positive
ground.
12 amps
a Clamp
that
transmitter
Note
ENSURE
TRANSMITTER
THE
Ammeter where
Wiring
lead
DC
Ammeter
and
On
the
readings
ALL
LEADS
through
grommet.
of
Also
Ammeter
heat
be
has
at
on
as
determined
on
POWER
BEFORE
IN
THE
one
the
ammeter
and
its
sure
least
is
used,
from
at
HIGH power
external
IS
REMOVED
ATTEMPTING
FOLLOWING
it
can
be
of
the
bottom
should
connections
the wiri
a 300
the
by
888-2126-026
ng
volt
insure
PA
Current
the
Ammeter.
FROM
STEPS
seen
connect
are
to th
insulation
that
and
increase
power
TO
ROUTE
.
from
side
positioned
e e
it
Shunt
meter
THE
front
access
to
the
xternal
rating.
is
not
could
power
or
of
RFI
the
transmitter
holes
PA
shunt.
so
they
DC Amm
sensitive.
damage
until
antenna
and
eter
up
Be
will
is
the
ful
cur-
4- 31
l
WARNING:
Disconnect
primary
power
prior
to
servicing.
Page 92
www.SteamPoweredRadio.Com
4-181.
display
Enter*
should
or
#05
agree
with
IF
QUIRED
ALL
ATTEMPTING
on
the
the
ACCESS
IN
POWER
digital
reading
WARNING
TO
THE
THE
FOLLOWING
FROM
ACCESS.
THE
display
on
the
external
I
AC
CONTROLLER
STEPS, REMOVE
TRANSMITTER
. The
reading
DC
Ammeter.
IS
RE-
BEFORE
on
the
digital
4-182.
nal
A25. Due
have
slightly
4-
183.
Ammeter
4-184.
the
panel
4-185.
leads
If
DC
Ammeter,
to
Repeat
reading
Once
Status
PA
Remove
from
the
digital
it
to
the
be
removed from
and
then
until
.
the
and
AMPS
meter
all
cabinet.
reading
will
limited
recheck
digital
Multimeter
ENSURE
TRANSMITTER
THE
be
transmitter
R2
is
read
correctly.
LEADS
power from
necessary
access
the
calibration.
properly
reading
board
ALL
IN
does
POWER
BEFORE
not
to
of
the
before
adjusted
agrees
Al2
should
WARNING
IS
ATTEMPTING
THE
FOLLOWING
transmitter
agree
adjust
AC
with
with
Controller
making
to
the
be
I
REMOVED
STEPS.
and
the
R2
on
the
agree
external
adjusted
FROM
TO
remove
reading
the
AC
board,
adjustment.
with
DC
to
THE
REMOVE
external
on
the
Controller
all
power
Adjust
the
external
Ammeter,
make
the
DC
Ammeter's
exter-
board
will
R60
front
R2
DC
on
4-
186.
play
the
4-
187.
transmitter
and up
4- 32
POWER
reads
AC
Controller
Locate
through
SUPPLY
power
and
the
CURRENT
supply
board
a
DC
route
WARNING
.
ENSURE
TRANSMITTER
THE
LEADS
Ammeter where
its
Remote
CALIBRATION.
current.
ALL
IN
leads
Wiring
: Disconnect
Calibration
WARNING
POWER
BEFORE
THE
throu
grommet.
Function
of
I
IS
REMOVED
ATTEMPTING
FOLLOWING
it
can
gh one
888-2126-026
prima
ry
pow
STEPS.
be
of
er
this
seen
the
prior
02 on
reading
FROM
TO
ROUTE
from
bottom
to ser
THE
vicing.
the
the
side
digital
is
made on
front
access
of
holes
dis
A25
the
-
Page 93
www.SteamPoweredRadio.Com
4-188.
it
to
the
The
removed from
Route
in
series
the
front
DC
Ammeter
negative
the
with
of
to
side
the
wiring
the
the
high
the
of
shunt.
for
supply
voltage
shunt
the
meter
the
DC
current
(leave
should
Ammeter
shunt
rectifiers.
the
white
connect
through
resistor
Connect
wire
to
this
Al9R4.
the
in
place
the
black
opening
This
positive
on
welding
and
is
the
connect
located
side
shunt).
of
cable
4-189.
4-190.
4-191.
nal
DC
board
will
Adjust
4-192.
Ammeter
have
Turn
The
Ammeter,
A25. Due
R23
the
digital
If
the
to
be
slightly
Repeat
reading.
transmitter
reading
IF
ACCESS
QUIRED
ALL
POWER
ATTEMPTING
digital
it
to
removed from
until
will
the
and
reading
limited
then
R23
on
IN
be
is
properly
on
at
HIGH
function
WARNING
TO
THE
THE
FOLLOWING
FROM
ACCESS.
necessary
the
recheck
THE
does
access
transmitter
WARNING
POWER
02
should
AC
CONTROLLER
TRANSMITTER
not
agree
to
adjust
of
the
the
calibration.
adjusted
.
I
STEPS,
with
AC
Controller
before
to
I
agree
IS
REMOVE
BEFORE
the
R23
agree
with
RE-
reading
on
the
making
with
the
DC
on
AC
board,
the
the
Ammeter.
the
exter-
Controller
all
power
adjustment.
external
DC
4-193.
Ammeter's
to
the
Remove
shunt.
leads
ENSURE
TRANSMITTER
THE
LEADS
all
power from
from
cabinet.
ALL
IN
POWER
BEFORE
THE
Be
IS
ATTEMPTING
FOLLOWING
the
transmitter
sure
888-2126-026
REMOVED
STEP.
to
reconnect
FROM
TO
REMOVE
and
the
THE
remove
black
external
welding
DC
cable
4-33
WARNING:
Disconnect
primary
power pri
or
to
servicing.
Page 94
www.SteamPoweredRadio.Com
4-194.
OVERLOAD
ADJUSTMENT
PROCEDURES
4-195. All
Multimeter
4-196.
4-197.
this
reading
R55
Check
reading
differs
adjustment
4-198.
power
After
output
pushbutton.
absence
of a load
overload
threshold
board.
OVERVOLTAGE
the
supply
to
the
figure
significantly
will
have
to
ENSURE
TRANSMITTER
USED
THAT
ATTEMPT
TAPS.
an
acceptable
to
zero
This
will
on
the
(STATUS
voltage
on
be
made
ALL
TO
MAY
AT
by
switching
allow
supply.
adjustments
INDICATION
on
the
factory
from
in
the
WARNING
AC
POWER
AND
THAT
REMOVE
BE
PRESENT
CHANGING
supply
the
the
digital
the
transformer
GROUNDING
ANY
RESIDUAL
BEFORE
voltage
to
low power
supply
are
"1")
test
test
I
IS
REMOVED
ANY
has
voltage
made
display(*
data
data
on
A12,
sheet
value,
or
.
tapping.
FROM
STICK
IS
VOLTAGE
MAKING
ANY
TRANSFORMER
been
and
to
observed,
depressing
increase
the
Status
#01).
If
the
an
appropriate
reduce
due
Compare
present
the
to
and
the
LOWER
the
4-199.
displays
from
this
Rotate
the
point.
4-200. R54
(STATUS
4-201.
the
present
the
4-202.
INDICATION
Check
factory
reading
cause
Locate
before
approximately
R55
fault
POWER
the
test
is
proceeding
R57
three
counterclockwise
condition.
SUPPLY
CURRENT
"2")
R54
and
R57
to
be
set
trips
slightly
CURRENT).
setting
both
conditions
off
by
1/3
present
data
PA
sheet
CURRENT
significantly
with
on
the
Status
turns.
Rotate
(STATUS
NOTE
overload
so
that
before
This
overloads
but
backing
of a turn
for
the
higher,
the
following
and
until
R55
one
INDICATION
adjustments
R57
R54
is
accomplished
under
the
.
reading(*
same
i t
will
Multimeter
the
transmitter
and
(PA
CURRENT)
(POWER
the
R54
overload
or
operating
be
R57
adjustment.
one-half
"16")
need
SUPPLY
by
same
#05)
against
co
necessary
bo
ard
and t
trips
turns
AND
R57
nditions
to
urn clockwise
off
clockwise
PA
CURRENT
the
value
.
If
investiga
and
on
the
te
...---....
,
4- 34
WARNING
:
Disconnect
888-2126-026
primary
power
prio
r to
servicing
.
Page 95
www.SteamPoweredRadio.Com
4-203.
the
value
If
the
present
investigate
Check
on
the
the
the
reading
cause
present
factory
before
power
test
is
significantly
proceeding
data
supply
sheet
current
for
different,
with
the
the
reading
same
it
R54
adjustment
(*
or
operating
will
be
/102)
against
conditions.
necessary
procedure.
to
~ -
4-204.
SX-1, 2750
to
until
trip
producing
4-205.
at
transmitter
4-206.
ducing
4-207.
100%.
the
point.
this
With
watts
Increase
transmitter
full
Adjust
setting.
should
Decrease
full
power.
R.58
UNDERDRIVE
4-208. Before
the
PA
module
for
specific
4-209.
(1100
Adjust
fault.
Modulate
watts
R58
Rotate
point.
the
transmitter
for
the
FAULT
light
power.
R57
counterclockwise
Transmitter
be
audio
adjusting
to
be
within
information
the
for
SX-1, 2750
clockwise
R58
one
operating
SX-2.5,
audio
and
level
faults.
should
cycling
level
0,5dB
(STATUS
the
normal
on
checking
transmitter
watts
until
and
one-half
5500
0.5dB
Adjust
now
R54
be
until
FAULT
on
and
off.
(6%)
INDICATION
underdrive
limits.
the
to
100%
for
the
transmitter
at
110%
watts
for
(6%).
1/3
of a turn
illuminated
the
transmitter
light
and
should
verify
"4")
threshold,
Refer
drive
level.
with
SX-2.
5,
turns
counterclockwise
power
SX-5),
Adjust
but
to
400
and
trips
output
modulate
R54
transmitter
remain
that
verify
the
IPA
Hz
at
5500
off
(1100
watts
with
counterclockwise
clockwise
from
should
faults.
Leave
illuminated
transmitter
the
rf
tuning
110%
watts
and
procedure
power
for
displays
from
20
is
drive
output
SX-5) .
the
for
Hz
this
be
R57
but
pro-
on
the
trip
4-210.
4-211.
PA
module
specific
4-212.
(1100
Adjust
fault.
R56
OVERDRIVE ( STATUS
Before
to
adjusting
be
information
Modulate
watts
R56
Rotate
for
counterclockwise
R56
within
the
normal
on
checking
transmitter
SX-1, 2750
one
and
INDICATION "8" )
the
overdrive
limits.
the
to
watts
until
the
one-half
threshold,
Refer
drive
100% with
for
transmitter
turns
888-
2126-026
to
level.
SX-2.
5,
clockwise
the
400
and
verify
IPA
Hz
5500
trips
from
the
tuning
at
110%
off
the
rf
watts
and
trip
drive
on
procedure
power
for
output
SX-5).
displays
point.
the
for
the
4-35
WARNING;
Disconnect
primary
power
prior
to
servicing
.
Page 96
www.SteamPoweredRadio.Com
4-213.
R51
VSWR -REFLECTED
POWER
(STATUS
INDICATION
"32")
4-
214.
400
button.
reach
Coupler.
towards
needlenose
4-215.
paragraph
same
point
clockwise
Set
watts
zero.
Turn
as
where
ENSURE
WAY
OF
P2
P2
OR
STILL
AT
P2
the
power
for
the
Shut
the
. Forward power
set
Remove
These
right
pliers
the
in
the
from
the
are
the
sensing
the
output
SX-5
transmitter
and
accessed
rear
will
transmitter
previous
point
THAT
DOWN
AND
P3
POWER
AND
using
rotate
(as
be
needed.
will
circuit
where
WARNING
THE
POWER
BEFORE
P3
IN
THE
ARE
REMOVED
OUTPUT,
P3.
to
90
watts
the
LOW
off
and
90
degrees
through
viewed
back
on
now
read
paragraph.
operates.
the
sensing
I
OUTPUT
CHANGING
FOLLOWING
WHILE
ARCING
for
power
allow
plugs
a
hole
from
at
front
the
zero
Adjust
circuit
power
Adjust
IS
ALL
THE
POSITION
STEP.
THERE
MAY
DEVELOP
SX-1, 200
position
time
and
for
P2
and
in
the
of
transmitter).
level
reflected
R51
R51
operated.
THE
IF
IS
watts
and
the
P3
top
set
counterclockwise
one
the
power
on
of
in
power
third
the
for SX- 2.
LOWER
Directional
the
the
will
of
5,
push-
output
cabinet,
A
set
previous
be
to
a
or
to
of
the
the
turn
~
4-216.
zero
.
t
he
action
original
4-
217.
Shut
This
R53
the
will
of
positions
VSWR -PHASE
ENSURE
WAY
OF
P2
STILL
AT
transmitter
take
the
VSWR
on
DO
PE
THAT
DOWN
P2
OR
P2
longer
the
NOT
RFORMING
BEFORE
AND
P3 IN
P3
POWER
AND
P3.
protection
Directional
ANGLE
MODULATE
WARNING
THE
POWER
THE
ARE
REMOVED
OUTPUT, ARCING
off
and
than
THE
normal
DETECTOR
WARNING
FOLLOW
OUTPUT
CHANGING
FOLLOWING
wait
circuit
Coupler.
(STATUS
THE
TRANSMITT
I NG
I
IS
ALL
THE
POSITION
STEP.
WHILE
for
due
.
THERE
MAY
DEVELOP
the
to
the
Put
P2
INDICATION
I
ER
PROCEDURE.
THE
IF
IS
power
low
and
WHEN
output
power
P3 back
"64")
to
setting
in
reach
and
their
4-36
WARNING: Disconnect
888-2126-026
primary
power
prior
to
servicing.
Page 97
www.SteamPoweredRadio.Com
4-218.
Clear
the#
display
with
a #99
entry
on
the
Keypad.
4-219.
watching
tection
4-220.
clockwise
4-221.
until
with
the
4-222.
the
a
"64"
1199
4-223.
4-224.
While
should
If
If
reading
Rotate
*20
a "64"
until
a "64"
*20
entry
on
on
TUNING
IPA
TUNING
HIGH
the
operate
it
reading
is
TUNING
power,
Digital
and a "64"
is
not
does
is
displayed
can
on
the
displayed
control
appear
Keypad
PROCEDURE
PROCEDURE
ENSURE
ARE
TURNED
THE
FOLLOWING
rotate
Display
displayed
.
before
be
raised
on
to
THE
HIGH
OFF
the
.
should
on
*20
to 3 .30.
and
then
the#
the
display.
right
WARNING
VOLTAGE
BEFORE
STEPS.
PA
TUNING
When
*20
be
displayed
the
reaches
rotate
to
II
I
AND
PROCEEDING
control
reaches
display,
3.30,
Clear
R53
minimize
LOW
VOLTAGE
to
the
left
3.30,
on
the#
rotate
rotate
the
counterclockwise
the
WITH
the
display.
R53
overload
*20
reading.
VSWR
R53
while
pro-
counter-
clockwise
display
until
4-225. With
scope
on
connect
4-226.
imately
Qll
modules.
range.
4-227.
of
slightly
the
and
rf
across
drive
appropriate
to
the
Set
25-30
Ql2 .
All
The IPA
on
the
Rl3
side
the
low
volts
Now
levels
tuning
voltage
the
capacitive
high
on
voltage
the
standoff.
of
Rl3
voltage
p-p
proceed
should
coil
. The
BEFORE
SETTING
VOLTAGE
CUIT
ENOUGH
and
PA
module
away from
circuit
of
rf
drive
to
check
be
(A26Ll)
best
BREAKER
POWER
IPA
side.
MAKING
ON
THE
BY
SETTING
the
Al.
The
ground
the
breaker
present.
the
relatively
is
tuning
WARNING
ANY
IPA COIL,
THE
TO
OFF. THE
TO
CAUSE
low
voltage
If
Rl3
lead
copper
to
rest
equal; within
normally
occurs
I
CHANGE
REMOVE
LOW
VOLTAGE
IPA PR
AN
RF
BURN
off,
is
not
of
the
heatsink.
ON.
of
IN
This
the
set
at
THE
.
There
at
the
THE
ODUCES
connect
used,
oscilloscope
should
checks
drive
the
or
very
peak
TAP
LOW
CIR-
place
the
levels
25-30
near
of
an
be
rf
rf
oscillo-
the
should
approx-
drive
on
volt
the
drive
probe
to
both
p-p
peak
or
WARNING:
888-2126-026
Disconnect primary
pow
er prior
to
servicing
4-37
.
Page 98
www.SteamPoweredRadio.Com
4-228.
voltage.
Before
THE
making
IPA
PRODUCES
any
change
ENOUGH
in
the
POWER
WARNING
TO
tap
CAUSE
I
setting,
AN
RF
shut
BURN.
off
the
low
4-229.
should
4-230.
ments
the
oscilloscope.
4-231.
to
produce
will
IPA
4-232.
either
square
yield
efficiency
If
be
Proper
to
It
Move
of
wave
the
adjusted
IPA
the tap
is
desired
stable,
poor
and
the
the
transistors
with
REMOVE
BEFORE
OR
rf
drive
to a higher
tuning
on
the
Changing
require
yet
stability.
overworking
scope
ringing
ALL
MAKING
A20R4.
exceeds
may
IPA
the
that
efficient
connections
to
should
POWER
ANY
32
volts
resistance
be
found
tuning
the
retuning
the
Over-driving
of
the
be
coil
NOTE
PA
module
Oscillator
class
the
inside,
present
FROM
ADJUSTMENTS
.
by
and
of
A26Ll.
D
the
Oscillator
to
the
Q12
TRANSMITTER
p-p,
making
then
(Al)
board
operation.
IPA
IPA,
or
on
both
TO
the
small
observing
should
drive
will
output
AS.
Ql3.
Ql2
A20R3
tap
on
A20R3
incremental
the
not
the
IPA
Under-driving
cause
transistors.
Place
A 30
and
to
Q13.
and
results
sufficiently
a
decrease
the
probe
60
volt
A20R4
adjust-
the
p-p
on
IPA
in
on
rf
4-233. Adjust
the
oscilloscope,
decrease.
(switching)
4-234.
fashion, but
on
the
4-235.
4-236.
minimize
the
location
4-237,
found
these
properly
measured
4-38
controls
Eventually,
mode
Adjust
IPA waveform.
TUNING
The
TUNING
reflected
During
to
be
tuned.
and
R27
and
A16R27
do
not
AND
of
the
the
well
adjusted
within
require
The
on
A16,
As
will
adjust
LOADING
and
power.
Direc~ional
initial
impedance
if
the
the
the
possibly
so
that
CONTROLS
LOADING
This
the
considerable
necessary.
RF
drive
IPA
transistors
R27
so
may
Coupler
tune-up,
range
at
Oscillator
to
the
oscillate.
the
IPA
far
that
controls
seem a
within
the
null
of
the
adjustment,
the
transmitter
888-2126-026
and
observe
IPA
is
decreased,
will
is
considerable
should initially
bit
TUNING
stop
operating
unconventional,
the
in
the
operating
Output
reflected
and
LOADING
antenna
output
the
IPA waveform
ringing
in
stable
ringing
be
but
Network.
power
controls.
is
terminal
in
class
class
is
produced
adjusted
is
due
should
probably
should
on
will
D
D
to
to
be
If
not
be
WARNING
:
Disconnect primary
power
prior
to
servicing.
Page 99
www.SteamPoweredRadio.Com
4-238.
obtained
on
position
The
minimum
More
by
exact
using
20
by
position
adjustment
position
alternate
20
number
of
20
on
adjustment
should
the
the
TUNING
Digital
of
coincide
and
Display.
the
with
LOADING
PA
TUNE
minimum
controls
Minimize
and
LOAD
reflected
may
the
number
controls.
power.
be
4-239.
intermodulation
result
TUNING
monitor
not
4-240.
4-241.
divider
A24.
modulation
4-242.
fixed
capacitors.
operating
customer
capacitors
sample
4-243.
levels.
Slight
in
control
be
moved
ADJUSTING
The
with
A
The
capacitors
level
C40,
the
BNC
monitor
power
selection
adjustment
distortion
some
(C40
reflected
sacrifices
PA
efficiency
more
modulation
the
adjustable
connector
level
These
levels
thru
for
each
the
bottom
than
one-half
THE
MODULATION
.
out
of
that
are
capacitors
but
of
C43)
of
of
(IMD)
power
PA
while
monitor
is
provided
the
installed
the
which
allow
the
trimmer
the
efficiency
turn
MONITOR
sample
portion
BNC
are
switches
capacitors
customer
affects
PA
TUNING
by
a
being
making
to
of
on
connector
in
normally
fine
power
control
few
tenths
indicated.
to
some
this
reduce
SAMPLE
circuit
the
the
the
associated
adjustment
the
adjustment.
circuit
RFI
is
RFI
factory
will
levels
sample
degree,
IMD,
OUTPUT
consists
board
primarily
board
be
in
of
.
may
of
a
Reducing
located
selected
with
circuit.
the
level
be
made
percent.
so
PA
of
on
for
connecting
dependent
next
the
capacitors
modulation
at
all
IMD
it
TUNING
a
the
to
the
for
The
to
improve
This
with
is
wise
should
capacitive
RFI
on
trimmer
customer
trimmer
monitor
three
may
the
to
board
to
the
allow
power
a
4-
244,
4-245.
4-246.
4-247.
advised
error
transmitter.
Due
settings,
C41
C42
C43
that
is
exclusively
is
exclusively
is
exclusively
to
the
these
ENSURE
MITTER PRIOR
JUSTMENTS
GROUND
BEEN
APPLIED.
proximity
adjustments
with
changes
for
low
for
medium
for
high
ALL
POWER
IN
ALL
CONNECTIONS
of
the
in
power
power
power
WARNING
IS
REMOVED
TO
MAKING
THE
FOLLOWING
trimmer
be
made
settings
888-2126-026
(located
(located
(located
I
ANY
WHERE
capacitors
through
made
FROM
OF
STEPS
POWER
a
with
just
to
just
just
TRANS-
THE
to
succession
all
right
to
to
right
ADAND
HAS
high
voltage
of
right
voltage,
of
C40).
of
C41).
of
C42).
trial
removed
it
from
4-39
is
and
WARNING:
Disconnect
primary
power
prior
to
servicing.
Page 100
www.SteamPoweredRadio.Com
4-248.
Loosening
parallel
these
amounts
will
capacitors
not
Tightening
will
to
of
adjust
increase
the
fixed
to
the
trimmer
the
trimmer
out
capacitance
the
capacitors
will
proper
monitor
increase
should
level.
capacitors
level.
will
the
monitor
only
will
Adding
reduce
be
done
reduce
the
level.
if
the
capacitors
monitor
Adding
the
trimmer
monitor
in
positions
level.
or
subtracting
capacitors
level.
Taking
4-249.
4-250.
with
4-251.
remove
4-252.
Cl
4-253.
shorting
shield.
compartment.
LS.
4-254.
to
14.
SX-1
Make
Remove
Mark
Mark
Remove
TOP
REMOVAL
ENSURE
COMPONENTS
STICK BEFORE
PROCEDURE.
sure
all
stick.
eight
Refer
position
position
10-32
PROCEDURE
ALL
power
screws
to
figure
of
clip
of
clip
Phillips
POWER
ARE
PERFORMING
is
turned
holding
4-1.
on
11
on
L7
head
WARNING
IS
REMOVED
SHORTED
off
perforated
and
then
and
then
screw
I
WITH
THE
and
remove
from
AND
SHORTING
FOLLOWING
network
bottom
remove
C3
connector
NETWORK
components
shield
and
fold
clip
and
on
strap
fold
strap
Ll
are
shorted
cover
back
back
that
and
into
---------
near
goes
4-255.
4-256.
side
see
4-257.
cabinet
4-258.
ward
4-259.
jack
4-260.
board
4-261.
cabinet.
4-40
panel
figure
and
Jl
Remove
Remove
bracket
4-2.
Remove two
top.
Remove
down
Disconnect
located
Disconnect
unit
located
Remove
BNC
coax
the
(near
6-32
(Screws
the
Directional
past
above
the
the
the
the
above
1/4-20
two
are
end
BNC
and
blue
connector
6-32
screws
and
left
located
of
coax
to
the
ribbon
to
nut
screws
side
L2.
and
on
J2
holding
of
that
Coupler
the
hold
on
top
connector
left
plug
left
lock
888-2126-026
(cable
L2
of
shield
of
12.
from
of
washer
A27AlP2).
Directional
looking
the
Directional
cabinet.)
from
from
jack
12.
from
in
from
See
cabinet
Directional
on
Directional
Ll
support
Coupler
back
of
Coupler
figure
by
taking
Coupler
bolt
shield
cabinet)
shield
4-3.
it
PC
Coupler
on
top
to
-
to
for-
board
PC
of
WARNING:
Di:sconnect
primo
ry
power
prior
to
servicing.
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