Bogen TP-160 Service manual

EBOGEN

MODEL

TP160

INSTRUCTION MANUAL

OPERATINGINSTRUCTIONS

POWER

Depress POWER ON button to turn on tuner. Turn off
tuner by depressing button again to release it to the out
position.

AM/FM TUNER

knob until pointer indicates desired station on FM (top)
dial. Carefully adjust TUNING knob until needle on tuning
meter is at the center of the tuning dial, exactly on the
circle above the letters “FM”.

AM

RECEPTION

Depress AM button. Turn TUNING knob until pointer
indicates desired station on AM (bottom) dial. Adjust TUN­ING knob until needle on tuning meter shows maximum

deflection to right.

FM RECEPTION

Depress FM and FM MUTE buttons. Turn TUNING

SPECIFICATIONS

FM TUNER SECTION
TUNING RANGE: 87.5 MHz to 108.5 MHz @
QUIETING SENSITIVITY:

HARMONIC DISTORTION: 0.3% at 100% modulation.
FREQUENCY RESPONSE:

HUM AND NOISE LEVEL:
ALTERNATE CHANNEL SELECTIVITY: 60 db. LHFM
DETECTOR BANDWIDTH: 900
CAPTURE RATIO: 1.9 db.
IMAGE REJECTION: 60 db.
I.F. REJECTION: 85
CROSS MODULATION REJECTION: 80 db.
ANTENNA:

3OOfI

1.5µV

0.5µV

db.

balanced;

for 30 db @

for 20 db @

20-20,000

70

db below 100% modulation.

kHz.

720

unbalanced or built-in line.

300 f-I

72fl
72n

Hz fldb (after de-emphasis).

NOTE

Muting removes the annoying noise between FM
stations. The muting circuitry may prevent the
receiver from distinguishing a very weak signal

from interstation noise. To tune in very weak

stations, defeat the mute circuit by releasing
the FM MUTE switch to the out position.

AM TUNER SECTION

TUNING RANGE: 530 kHz to 1620 kHz.

@

LOOP SENSITIVITY: 2µV
ALTERNATE CHANNEL SELECTIVITY:
HARMONIC DISTORTION: Less than 1%

AUDIO OUTPUT: Adjustable (rear panel),
OPERATING CONTROLS: Selector (Power, AM, FM, FM

POWER CONSUMPTION: 60W
OVERALL DIMENSIONS: 14-l/2” W
RACK INTERIOR DIMENSIONS: 14” W x

9-l/2

WEIGHT:

Ibs.

6db S/N and 60% modulation.

(±l0

@

SO% modulation

MISCELLANEOUS

0-1.2V

Mute), Tuning.

@

120

vac,

6OHz

x 3-3/4”

3-l/4”

kHz) 40 db.

H x

12”

D

H x 11” D

PRlNTED IN U.S.A.

10-70A

LEAR SIEGLER, INC.

BOGEN

PARAMUS,

DlVlSION

N. J.

07652

54-5516-01

INSTALLATION INSTRUCTIONS

UNPACKING

NOTE

This paragraph does not apply to tuners shipped
as a part of a Bogen Centralized School Sound
tern console or rack.

If the Model TP160 AM/FM Tuner is not part of a Bogen
Centralized School Sound System console or rack, care­fully unpack the carton and inspect the unit for damage.
If a unit shipped to you proves to be damaged, make an
immediate claim with the shipping carrier. If the unit was
picked up directly from a dealer or distributor, make any

damage claim directly to the seller without delay.

RACK INSTALLATION

Sys-

Figure 1 - Rack Mounting With Model

RPK-31

Brackets

NOTE

This paragraph applies only
be installed in a 19”equipment rack.

The Model TP160 may be installed in a standard 19” equip­ment rack by using Model RPK31 rack mounting brackets.
Remove the four screws securing the side of the cover.
Do not remove the cover. Install the brackets as shown
in figure 1, securing them to the tuner with the four screws
supplied with the brackets. Each bracket has two elongated
holes on three-inch centers for fastening to a standard 19”
equipment rack.

to tuners which will

CONNECTING AM ANTENNA

An external antenna must be installed on any Model

TP160 which will be used to receive AM broadcasts. Con­nect the antenna as shown in figure 2.

CONNECTING EXTERNAL FM ANTENNA

IMPORTANT

Always disconnect the FM Line Antenna

when using an external FM antenna.

HI-Z ANTENNA WIR

AM

Figure 2 - Connecting AM Antenna

Connecting To External TV Antenna

For optimum performance, a separate FM antenna is rec­ommended. If a TV antenna must be used for both FM and
TV reception, install an FM signal splitter at the end of the
transmission line, as shown in figure 4.

GND

The Model TP160 has an internal FM Line Antenna which
may be used for receiving FM broadcasts. For improved
reception, particularly in weak signal areas or for tuners
mounted in consoles or racks, installation of an outdoor FM
or “T” antenna is necessary. If you are installing a standard
300-ohm antenna system, connect the twin-lead transmission
line as shown in figure 3a. If conditions require use of a
coaxial transmission line, such as
connect the cable as shown in figure 3b. Coaxial cable must

be used when the transmission line is run in conduit.

RG-11/U

or RG-59/U,

LEVEL CONTROL

Model TP160 AM/FM tuners shipped with Bogen Cen­tralized School Sound System consoles or racks have the
LEVEL control preset to the proper output for the booster
amplifier. Tuners shipped separately have the LEVEL con­trol set for maximum output, which is 1.2 volts.

To decrease the audio output from the tuner, turn the

LEVEL control counterclockwise. To increase the audio

output, turn the LEVEL control clockwise.

MAINTENANCE

There are no user serviceable parts inside
the unit and removal of the dust cover pre-

servicing should be attempted only by a

BOGEN SERVICE

We are interested in your Bogen tuner for as long as you
have it. If trouble ever develops with your unit, please do
not hesitate to ask our advice or assistance. Write to Ser­vice Department, Bogen Division, Lear Siegler, Inc., P.O.
Box 500, Paramus, New Jersey 07652.

When communicating with us, give the model number
and serial number of your unit. Describe the difficulty
encountered and the effects each operating control has
upon the trouble symptoms. Include details on electrical con­nections to associated equipment, and list such equipment.
When we receive this information, we will send you service
information if the trouble appears to be simple. If the trouble
requires servicing, we will send you the name and address
of

the nearest

can send your unit for repairs.

When shipping your unit, pack it carefully using the
original shipping carton, or a similar container and filler
material, to prevent damage in transit. Send the unit, fully

insured and prepaid, via railway express or United Parcel.

Do not ship via parcel post unless so instructed.

DIAL CORD RESTRINGING. Refer to figure 5 and proceed

Bogen authorized service agency to which you

as follows:
a) Remove front panel by pulling off TUNING knob and
removing two Phillips-head screws.
b) Connect dial cord at drum hook marked START in
diagram.
c) String dial around nylon pulleys and tuning shafe to
drum hook marked FINISH in diagram. Make certain cord
winds around tuning shaft from rear toward front, as shown.

d) Attach end of cord with tension spring, making certain
that spring applies enough pressure to prevent cord from
slipping.
e) Tune in a known station and attach dial pointer at proper
position. Before securing pointer, twist cord as shown in
diagram so cord will exert a slight pressure toward panel
bracket and away from dial glass.

REPLACING DIAL LAMP. Remove front panel as described
in step a), above, and replace lamp with 6.3V No. 12 bulb
(Bogen Part

94-0175-01).

REPLACEMENT PARTS

Most components used in the Model TP160 are avail­able through all reputable parts jobbers. The parts listed
here are available from Bogen distributors, service agencies
or directly from the factory.

When ordering parts from
ber and description, as listed below. Also give the Model

TP160 and the Series designation, which is a letter followed
by numbers stamped or screened on rear of the chassis.

When ordering a part for the PC Board, also give the PC

Board component number, which is

Bogen,

specify the part num-

45-9764-01.

PULLEY (SIDE VIEW

POINTER

(FRONT VIEW)

*

PROPER LENGTH WHEN SPRING IS STRETCHED TO I’:

Figure 5 - Dial Stringing Diagram

)

.

C74--1744

4

Ref. No.

Part No. Description

Ref. No.

Part No. Description

Al

c3
C6
c7
Cl3
Cl4

c25
C26
C30

c31
C35,36
c37

C40

c41
C46
CR1,4
CR2,3

FL-l, 2

FL-3

IC-1

IC-2

Ll

MPl

Q1, 2

Q3,4

Q5
Q6,7

R90
Tl
T2

45-9764-01

79-005-044
79-209-001

79-008-057
78-221-121
78-221-116

79-005-049
78-221-113
78-250-005
78-201-099

79-005-049

79-005-055

96-5093-02
96-5093-01
78-959-001

95-5158-01
96-5238-02
96523801
95-5146-01
94-1277-01

96-5221-01
96-5235-01
96-5237-01

96-5213-01
77-001-691
95-5156-01
95-5152-01

RF, IF Component Board Assy,

Complete

Capacitor, Electrolytic, 2µF, 25 V
Capacitor,

5pF,

500 V
Capacitor’50 µ F, 50 V
Capacitor,

470pF

Capacitor, 180pF
Capacitor, 25

Capacitor,

µF,

1OOpF

35 V

Capacitor, .06µ F, 50 V
Capacitor,

6.8pF,

5%
(Same as C26)
(Same as C13)

Capacitor, Electrolytic,

25µF, 25V

Capacitor, Electrolytic, 4µF, 50 V

(Same as C3)

Diode,

Diode,

lN541

lN542,

Matched Pair

Ceramic Filter, FM IF (Specify

Color Code)

Mechanical Filter, 455 KHz
Integrated Circuit, 1st FM IF
Integrated Circuit, 2nd FM IF
Coil, Choke,

56µ

H
FM Tuner Assembly
Transistor,
Transistor,
Transistor,

Transistor,

2N5127
2N5126
BC147B

2N5089
Control, Mute Adj., 47 K
Transformer, AM Oscillator
Transformer, 1st AM IF

T3
T4

96-5153-01

Transformer, 2nd AM IF

965157-01 Transformer, FM IF

T5 96-5151-01 Transformer, FM Discriminator

Chassis Electrical Parts

ClOl-Cl04
Cl07
Cl08

Cl09

Cl10

CRlOl, 102
CR103
1101,102
LlOl, 102

L103

L104
Ml01
R107
SW102-104

.

SW101
TlOl

-

-

-

-

-

-

78-201-115
78-200-100
79-005-062

79-005-054

79-005-039

96-5109-01
96-5248-04
94-0175-01
95-5148-01
95-5159-01
95-5015-01
94-1309-01
77-001-467
81-004-053
81-003-049
83-750-000

12-4503-01

12-4165-01

02-9003-08

Capacitor,
Capacitor,

15OpF, 500

15pF,

Capacitor, Electrolytic,

500µF,

50V

Capacitor, Electrolytic,

700µ

F, 35 V

Capacitor, Electrolytic,

1000µF,

Diode,

15V

lOOmA,
Diode, Zener, 12 V, 1 W
Lamp, Dial
Coil, RF Choke, 3.9
Coil, AM Antenna
Coil, RF Choke,
Meter, Tuning
Control, LEVEL
Assembly, Pushbutton Switch
Switch, SPST, 3 A, with Cover
Transformer, Power

Mechanical Parts

Dial Cord
Dial Glass

Dial Spring

22-5234-01 Cover

14-9064-01

Foot, Cover

03-0629-02 Knob, Tuning

V

1400 V

150 PIV

µ

H

1µ

H

ALIGNMENT

The following instruments (or equivalent) are required

for a complete alignment of the receiver.

DC VTVM, RCA
AC VTVM, HP 400D
AM Signal Generator, Measurements Corp 65-B
FM Sweep Generator, Measurements Corp 88 or Boonton

Radio Corp 202H

AM Alignment

To completely align the AM section, start with the last
AM IF transformer and work back toward the antenna. In
order to limit the effect of the AGC circuit, continually

reduce the generator signal level to the minimum required
for an output indication. Make the adjustments listed in Table
I. See figure 6 for location of alignment adjustments.

WV98-C

FM Alignment

To align the FM section, follow the procedure given in

Table II. See figure

FROM
GENERATOR

A74-1479-01

Figure 6 - Dummy Antenna for FM Alignment

7

for location of adjustments.

(25A)

15on

I

u

1

TABLE I - AM ALIGNMENT CHART (See Figure 7)

NOTE: Set Selector Switch to AM

Step

Band & Dial

Setting

Indicator at Ex- 455 kHz

1

treme left end of at 400 Hz. Generator capacitor to TP-22,

dial output level

AM at

2

3

600

AM at 1400 kHz 1400 kHz, 30% AM Mod Same as Step 2, Same as Step 2,

4

FM at 98 MHz 98 MHz

2

3

FM at 104 MHz

FM at 90 MHz 90 MHz

4

Generator
Frequency

30%,

AM Mod

Signal

Input

Through

Indicator and

Connection

.05

MFD DC VTVM at TP-,

2, terminal 2 of

5µV,

terminal 22 of Al.

Al.

maximum

kHz

600

kHz, 30% AM Mod AM EXTERNAL

Oscilloscope and
at 400 Hz. Generator ANT. and GND. dc VTM at TP-2,
output level 1

mV,

terminal 2 of Al.
maximum.

at 400 Hz. Generator o above.
output level

500µV,

above.

maximum.

Repeat steps 2 and 3, above until all outputs are peaked at the proper frequencies. As a gain
check, 600 kHz input should be less than

3OµV

for output of 0.5 vdc above noise, and 1400

kHz input should be less than 35µV for output of 0.5 vdc above noise.

-

TABLE II

FM ALIGNMENT CHART (See Figure 7)

Set FM MUTE Switch to OUT (button out), and Selector Switch to FM (button in).

Generator

Signal Input

Point

Indicator

Connection

&

Check color code (paint dot) on ceramic filters FL1 and FL2 (figure 2) to determine IF center
frequency. Frequency for each color is: Green
Orange

(10.73),

White

(10.75),

Yellow (10.80). Both filters in any one receiver must have same

(10.60),

Black

(10.65),

Blue

(10.67),

Red (10.70).

colored dots.

±300

kHz sweep
deviation at 400 Hz mod-
ulation. Generator

out-

put level approx. 2OµV.

300

ohm

FM
tenna
through

an-

terminals

dummy Al.

antenna (see

Oscilloscope at

TP-6, terminal 6 of

fig-

Adjust T4 and FM IF XFMR

gure 6)

104

MHz

±75

kHz Same as Step 2,
sweep deviation at 400
Hz modulation.

Genera-

above

Tuning Meter

tor output level approx.

lOµV.

µ75

deviation at

kHz sweep

400

Hz mod-
ulation Generator
put level approx.

out-

1OµV.

Same as Step 2, Tuning Meter

NOTE: Repeat steps 3 and 4 as required to obtain satisfactory tracking at both frequencies.

Adjustment and Indication

Adjust T2 and T3 for maxi­mum indication on meter. As
a gain check, input should be
less than

4µV

for an. output

0.5 vdc above noise.
Tl

Adjust

and Ant Coil

L103
for maximum indication on
meter. Keep dc output level
below 1 volt by reducing in­put as peak is approached.

Adjust (first) AM OSC TRIM,
(then) AM ANT TRIM for
maximum indication on meter.
Keep dc output level below 1
volt by reducing input as peak
is approached.

Adjustment andindication

(in tuner) for max gain with
good symmetry. Adjust T5
for optimum “S” curve.

Check tracking. If necessary,
adjust FM OSC TRIM, FM
RF TRIM and FM ANT TRIM
for max gain.

Check tracking. If necessary,
adjust FM OSC COIL, FM RF
COIL and FM ANT COIL for
max gain. FM OSC COIL is
adjusted by carefully compres­sing turns closer together with
an

insulated

instrument.

5

6

L

FM MUTING CHECK

±75

FM at 98 MHz

98 MHz

kHz sweep Same as Step 2,
deviation at 400 Hz. above scope
Generator output level
20µV.

Same as Step 5,

Same as Step 5, above. Same as Step 2,

above.

ac VTVM and Record ac output level on

at TP-8,

terminal 8 of Al.

Same as Step 5,

above. above.

6

VTVM

Depress FM MUTE switch.
Reading at TP-8 should drop
about 3 db. If required, adjust
MUTE ADJ

(R90)

for proper

reading.