Tektronix Y-T Service manual
Y-l
bnART
RE
INSTRUCTION
ORDER
MANUAL
---
COMMITTED
TO
EXCELLENCE
Tektronix, Inc.
P.O.
Box
500
Beaverton,
OR
970TI
PLEASE CHECK
FOR
CHANGE
INFORMATION AT THE REAR
OF
THIS MANUAL.
Y-T
CHART
RECORDER
INSTRUCTION MANUAL
First Printing
Revised
OCT
NOV
1987
1984
Copyright
O
1984, 1985, 1986,
and
1987
Tektronix, Inc. All
rights reserved. Contents of this publication .may not be repro-
duced in any form without the written permission of Tektronix,
Inc.
Products of Tektronix, Inc. and its subsidiaries are covered by
U.S.
and foreign patents andtor pending patents.
TEKTRONIX, TEK. and
are registered trademarks of
Tektronix, Inc. TELEQUIPMENT is a registered trademark of
U.K.
Tektronix.
Limited.
Printed in U.S.A. Specification and price change privileges are
reserved.
REV
DEC
1986
TABLE
List of
Safety Summary
Section 1 INTRODUCTION AND SPECIFICATION
Section
Installation
Stylus Alignment
Chart Paper Alignment
Record
Evaluation
Battery Operating Time
Installing Chart Recorder Paper
illustrations
2
OPERATING INSTRUCTIONS
..........................................................................................
................................................................................................
..........................................................................................
..............................................................................
..........................................
................................................................................
OF CONTENTS
.
.......................................................................
..........................................
.........................................................
................................
............................
Page
iv
v
2-1
2-1
2-1
2-1
2-2
2-2
2-2
Y-T
Chart Recorder
TABLE
3
Section
Motor Voltage Control
Heater Vottage Regulator
Pen Drive Amplifier
Speed Sensing 3-2
Section 4 CALIBRATION
Calibration for
Calibration for
CIRCUIT DESCRIPTION
1500
Stylus Temperature and Gain Adjustment
Chart Recorder Checks
Motor Speed Control Adjustment
OF
Stylus Temperature and Gain Adjustment
Motor Speed Adjustment
Chart Recorder Checks 4-8
Linearity Checks
OF
CONTENTS
(cont)
......................................................................
...................................................................
.........................................................................
...................................................................................
TDR Series
........................................................
......................................
..................................................................
....................................................
TDR Series
...........................................................
......................................
...............................................................
..................................................................
..........................................................................
Page
3-1
3-1
3-2
4-1
4-2
4-3
4-6
4-7
4-7
4-8
4-9
REV DEC
1986
LE
OF CONTENTS
5
Section
Chart Recorder Repair
Changing the Stylus
Replacing the Rubber Rollers
Repacking for Shipment
Section 6 OPTIONS
Section
Section
Y-T
Section 9 REPLACEABLE MECHANICAL PARTS
Section
MAINTENANCE
.......................................................................
...........................................................................
............................................................
.....................................................................
7
REPLACEABLE ELECTRICAL PARTS
8
DIAGRAMS
Chart Recorder Schematic
10
ACCESSORIES
..........................................................
(cont)
Page
5-1
5-1
5-3
5-5
8-4
Y-T
Chart
Recorder
REV DEC 1986
iii
Y-T
Chart
Recorder
TABLE OF ILLUSTRATIONS
Title
Tektronix Y-T Chart Recorder
Chart Recorder Controls
Stylus Position Adjusted
Chart Recorder Motor
Motor Speed Control
Verifying Peak-to-Peak Signals
Aligning Chart Paper
Location of Chart Recorder Components
Correct Alignment of Stylus Assembly Connecting Wire
Y-T Chart Recorder Circuit Board
Motor Speed Control Circuit Board
Modified Circuit Board
Y-T Chart Recorder Exploded View
Accessories 9-13
.................................................................................
.................................................................
..................................................................
...................................................................
.................................................................
.....................................................
..............................................................
..............................................................
..................................................
....................................
.............
...............................................
..............................................
............................................
Page
2-3
4-4
4-4
4-5
4-5
4-9
4-10
5-2
5-4
8-6
8-7
8-8
9-12
REV
JUN
1987
Y-T
Chart
Recorder
ERATOR
The general safety information in this part of the sum-
mary is for both operating and servicing personnel. which could result in personal injury or loss of life.
Specific warnings and cautions will be found throughout
the manual where they apply, but may not appear in this
summary.
TERMS
In This
CAUTION
which could result in damage to the equipment or other
Property.
REV
Manual
statements identify conditions or practices
DEC
1986
SAF
WARNING
As
Marked
CAUTION
ately accessible as one reads the marking, or a hazard
to property including the equipment itself.
DANGER
accessible as one reads the marking.
statements identify conditions or practices
on
Equipment
indicates a personal injury hazard not irnrnedi-
indicates a personal injury hazard immediately
Y-T
Chart Recorder
SYMBOLS
In
This
Manual
This symbol indicates where applicable cau-
tionary or other information is to be found.
As
Marked on Equipment
b
@
DANGER-High Voltage
AlTENTION-refer to manual.
Protective ground (earth) terminal.
Power Source
This product is intended to operate from a power source
supplied by the parent instrument (fiber or metallic TDR).
Do not attempt to power this module by any other
means.
Grounding the Product
This product is grounded through the parent instrument.
A
protective ground connection is essential for safe
operation.
Danger Arising From Loss
Upon loss of the protective-ground connection, all acces-
sible conductive parts (including knobs and controls that
appear to
be
insulating) can render an electric shock.
of
Ground
REV DEC
1986
Y-T
Chart
Recorder
Do Not Operate in Explosive
Atmospheres
To avoid explosion, do not operate this product in an
it
explosive atmosphere unless
certified for such operation.
has been specifically
Do Not Service Alone
Do not perform internal service or adjustment of this pro-
duct unless another person capable of rendering first aid
and resuscitation is present.
REV
DEC
1986
Use Care When Servicing With Power
On
Dangerous voltages exist at several points in this pro-
duct. To avoid personal injury, do not touch exposed
connections and components while power is on.
Disconnect power before removing protective panels,
soldering, or replacing components.
Do Not Remove Covers or Panels
To avoid personal injury, do not remove the product cov-
ers or panels. Do not operate the product without the
covers and panels properly installed.
vii
INTRODUCTION AND SPECIFICATION
INTRODUCTION
The Tektronix
sory for the Tektronix Metallic and Optical Fiber Time
Domain Reflectometers.
place of the Blank Module or the
The chart recorder uses a heated stylus, and
heat sensitive chart paper to reproduce the
A
chart recording is a permanent record. It can be of
great service in fault interpretation (e.g., a chart record-
ing of a faulty twisted pair can
good twisted pair).
REV
DEC
1986
Y-T
Chart Recorder is an optional acces-
It
plugs into the instrument in
XY1
Output Module.
CRT
be
compared to that of a
4
cm wide
display.
SPECIFICATION
Table
1-1
lists the electrical characteristics and features
that apply to the Tektronix Y-T Chart Recorder when it is
installed in the Tektronix
TDR Series instruments after a
The Performance Requirement column describes the lim-
its of the characteristic and the Supplemental Information
column describes features and typical values or informa-
tion that may be helpful.
1500
TDR Series or the OF
20
minute warm-up.
Y-T
Introduction and Specification
Table
1-1
ELECTRICAL CHARACTERISTICS
Characteristic Performance Requirement
Chart dimensions corresponding
to full CRT graticule area
Chart running time
Chart distance scale linearity
(corr. to CRT graticule)
Chart vertical scale linearity
(corr. to CRT graticule
Power Requirements
+
0.2 major division match
at any point
+
5%
of deflection from
+
0.3
center,
major division
Supplemental Information
16 seconds
after setting Stylus
Position adjustment
Power is obtained from the
parent instrument via P1096
REV
DEC
1986
OPERATING INSTRUCTIONS
CAUTION
D
Turn the parent instrument's power switch
removing or installing the
Y-T
Chart Recorder.
Installation
The Tekronix Y-T Chart Recorder can be installed in the
instrument's plug-in module compartment. The LOCK
knob secures the chart recorder in the instrument.
Stylus Alignment
When the parent instrument's RECORD switch is
pressed, power is applied to the recorder stylus.
position of the stylus can then be aligned by adjusting
the STYLUS POSITION screw. Align the stylus to
correspond with the position of the CRT trace.
REV
DEC
1986
OFF
prior to
The
Chart Paper Alignment
To align the chart horizontally, pull the paper until a dark
line on the paper is aligned with the red reference line
visible through a sprocket hole.
Record
When the RECORD switch is pressed, then released, a
chart recording starts. The chart recording circuitry
automatically shuts off when the recording is completed.
Extra graph paper is run out to allow removal of the
recording. When removing the recording, tear paper
upward.
Y-T
Operating Instructions
Evaluation
In evaluating a graph, the distance between two dark
horizontal lines corresponds to one vertical division of
the CRT display. The distance between two dark vertical
lines corresponds to one major horizontal division of the
CRT display.
Battery Operating Time
The chart recorder can make up to 20 graphs on a full
charge of the batteries; the instrument will still operate
for a minimum of 5 hours. After 20 graphs have been
made, the time that the instrument can be operated
without recharging the batteries will be reduced by
approximately three minutes per recording.
(1
500
Series)
Installing Chart Recorder Paper
Approximately 60 graphs can be made with one roll of
chart recorder paper for the 1500 TDR Series, or approx-
imately 120 for the OF
TDR
Series.
NOTE
Chart paper for the
is different. Check the Mechanical Parts List, Acces-
sories, section of this manual for the proper chart paper
part numbers.
Turn LOCK knob counter-clockwise and pull chart
recorder from the instrument.
Push in on the bottom edges of the bezel and lift
upward.
Remove empty spool from recorder by pulling it
upward.
Place new roll of graph paper in top of recorder
and push into place between the spring-loaded
paper holders. Be sure the grid of the paper faces
up (see Figure
1500
2-1).
TDR
and
OF
TDR
REV
instruments
DEC
1986
Fig.
2-1.
Y-T
Chart
-pp
Recorder.
Y-T
Operating Instructions
Pull the paper over the rollers and down the front
of the recorder. Lower the bezel until it latches
into place.
Align the graph paper so that one of the dark lines
on the paper is lined
up
with the red reference line
visible through a sprocket hole. This sets the
graph paper
so
that a recording will start at one of
the dark lines corresponding to the edge of the
CRT graticule.
Place the chart recorder back into the instrument,
then turn the
LOCK
knob clockwise to lock.
REV
DEC
1986
This section describes the Chart Recorder circuitry using
the circuit diagrams at the back of this manual. The
Chart Recorder contains three basic circuits: the motor
voltage control, heater voltage regulator, and a pen drive
amplifier.
Motor-Voltage Control
When pin 4 of P1096 is switched to 0
Q1015 is turned on and acts as a switch, which applies
12 volts to the Motor Speed Control.
Motor current and torque load are sensed by R2026 and
U2035A, providing a signal to U20358, where it is com-
pared with
circuit U20356 and transistors Q1039 and Q1 024 form
voltage-controlled current source for the drive motor.
REV
DEC
a
reference voltage set by R1015. Integrated
1986
V,
transistor
Heater-Voltage Regulator
This circuit provides 3 A at 1.0 V to the stylus heating
a
element. The circuit is
Transistor Q2023 acts as a series switch that supplies
current to energy storage device L1029. Transistors
Q4021 and Q3023 form the sensing amplifier whose sig-
nal is amplified by Q3028, (23027, Q3026, and Q4027 in
order to switch Q2023. Diode CR2031 shunts the
current that flows through L1029 when Q2023 is turned
off. Resistor R4017 is used to set the output voltage at
1
V.
The 1 V switching supply is controlled by the stylus
heat control line (pin 12), which is grounded when stylus
heat is required.
a
series-switching regulator type.
Y-T
Circuit Description
Pen-Drive Amplifier
The pen-drive amplifier consists of operational amplifier
U3034
Q4033.
adjustment,
chart paper. Gain of the amplifier is controlled by
R2033,
amplifier circuit provides amplification to either positive or
negative going inputs. The
-8
trolled by the chart recorder power switches in the parent
instrument.
Diodes
drive amplifier from high reverse voltages which may
occur on the
Thermistor
motor non-linearity.
and power amplifiers
STYLUS
POSITION, an external screwdriver
R2034,
is used to center the stylus on the
Q4030, (24032, Q3033,
an internal screwdriver adjustment. The power
+5
V
and
-5 V (+8
V
for
1500
Series) to the power amplifiers are con-
CR4030
and
5
5
RT1039
CR4031
V
(5
and
are used to protect the pen
8 V 1500
R1037
Series) power bus.
compensate for pen
V
and
and
Speed Sensing
A speed-sensing circuit consists of
tosensitive transistor
Q0182
is activated by the passing of each sprocket hole.
The on-off rate of
Q0182.
Q01 82
is an indication of the paper
motor speed. This activation rate is used to synchronize
the display sweep speed with the proper paper motor
speed.
DS0282,
and pho-
As the paper travels,
REV
DEC 1986
CALIBRATION
for
1500
TDR
SERIES
Equipment Required for 1502
l.
50 R terminator (01 1-0123-00)
2.
Chart Recorder Extender (067-1 071 -00)
3.
3-inch screwdriver
Equipment Required for 1503
1.
Chart Recorder Extender (067-1 071 -00)
2.
3-inch screwdriver
REV
DEC
1986
1502 Control Settings:
rnp1DIV 200
FEETtD
DISTANCE DIAL 000
MULTIPLIER
DIELECTRICS All out
GAIN
CABLE
IV 20 (Metric
X
1
5
div. pulse
R
terminator
50
5)
Y-T
Calibration
1503
Control Settings:
RET LOSS
OdB SET
DISTANCE DIAL
FEET/DIV
MULTIPLIER
DIELECTRICS
IMPULSE WIDTH
CABLE
Od
B
5
div. pulse
000
l0
(Metric
X1 0
All out
l
OOns
No termination
l)
Stylus Temperature and Gain Adjust-
ment
a.
Remove the chart recorder from the instrument.
b.
Adjust R4017 (STYLUS TEMP) clockwise to
increase the graph intensity or counterclockwise to
decrease the intensity. See Figures 4-1 or
location of chart recorder adjustments.
8-3
for
NOTE
Power consumption goes up as the stylus temperature
increases. Therefore, it is important to have the stylus
temperature as low as possible without sacrificing an
adequate remrding trace.
c.
Adjust R2033 (GAIN) clockwise to increase the
amplitude of the chart trace or counterclockwise to
decrease the amplitude of the trace.
After the chart recording has been made, pull the
d.
paper until a dark line is aligned with the red refer-
ence line seen through a sprocket hole.
Place the chart recorder back in the instrument.
e.
REV
JUN
1987
Y-T
Calibration
Chart Recorder Checks
Using
ZERO
center the trace on the CRT. Baseline should be
one horizontal line from the bottom. The !eading
edge of the 1502 trace should be positioned on
the center graticule line. The leading edge of the
1503 trace should
from the lefi (arrow).
Adjust 1503 VAR for an
Adjust 0-dB SET (1502 GAIN) for a
pulse height.
Press RECORD switch momentarily (for stylus to
heat), then release.
Adjust STYLUS POSITION control so the baseline
position on the chart trace matches the CRT base-
line (see
REV
DEC
1986
REF and POSITION controls,
be
positioned one vertical line
8
division pulse width.
Fig.4-2).
5
division
e.
When the recording is complete, check that the
recording starts at the second division line from
the right. The amplitude of the pulse should match
that of the CRT (5 div.). If it does not, adjust the
chart recorder gain.
The position of the leading edge of the chart
recording should match the position
of
edge of the CRT pulse. (In the 1503, both the
leading and trailing edges should match.)
1
do not match within
minor division, re-check the
the horizontal timing as outlined in the parent
instrilment manual.
the leading
If
they
Calibration
Y-T
-
l
Fig.
4-1. Chart Recorder Controls.
5160-C
Fig.
4-2.
Stylus Position Adjusted.
REV
DEC
1986
Y-T
Calibration
I
REV
DEC
1986
Micro
Fig.
4-3.
MO
@
Chart Recorder Motors.
ESCAP
@
51
60-03
Fig.
4-4. Motor Speed Control.
Loading...