Tektronix TAS 475 Service Manual

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This procedure checks the A62 Front
Panel module. Since the front panel
is difficult to probe while installed,
measurements are taken on J30 of
the processor
module.
Measure the power supply voltages
on J30 of the A5 CPU board.
Pin 10 -5.2V
Pin 1 +5.2V
With
an oscilloscope, measure the
signals on pins 5 and 6 of J30.
Turn knobs and press buttons
while watching the
signals for small
changes in shape .
Connect a
X1 0 probe to the CH 1
input connector
while watching the
Volts/Div readout on the CRT.
Turn the power off.
Disconnect the
cable from
the A62 Front
Panel module
to the A5 CPU board.
Check pins 1 and
10 for
shorts to ground.
Replace the A62 Front
Panel module.
Measure the voltage on pin
13 of
J30 while connecting
and disconnecting the
probe
to channel 1.
Disconnect the front panel
cable
to J84 on the display
control module
and check
the
J30 pins 1 and 10 again
for shorts to ground.
Troubleshooting
Perform the A5 CPU
Board Troubleshooting
Procedure.
Replace
the A3 Display
Driver board.
Replace the A 1 Analog
board.
Figure 6-24: A62 Front Panel module Troubleshooting Procedure
TAS 475 and TAS 485 Service Manual
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Tektronix TAS 475 Specifications

General

Brand	Tektronix
Model	TAS 475
Category	Test Equipment
Language	English