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SECTION 4
Service Information
4.1 INTRODUCTION
This section contains information
necessary to service the
Model 7071 General Purpose Matrix Card and is arranged
as follows:
4.2
4.3
4.4
4.5
4.6
4.7
Handling
and Cleaning
Precautions:
Discusses
handling
procedures and cleaning methods for the
matrix card.
Relay Test Program: Explains
how to connect the
matrix card to the Model 707 mainframe for the relay
test program.
Performance
Verification:
Covers the procedures
necessary to determine
if the card is operating
properly.
Principles
of Operation:
Briefly
discusses circuit
operation.
Special
Handling
of Static-Sensitive
Devices:
Reviews precautions necessary when handling static-
sensitive devices.
Troubleshooting:
Presents some troubleshooting
tips for the matrix card.
4.2 HANDLING
AND CLEANING
PRECAUTIONS
Because of the high impedance circuits on the Model 7071,
care should be taken when handling
or servicing the card
to prevent possible contamination,
which could degrade
performance.
The following
precautions
should be taken
when
handling
the matrix card.
1. Do not store or operate the card in an environment
where dust could settle on the circuit board. Use dry
nitrogen
gas to clean dust off the card if necessary.
2. Handle the card only by the handle and side edges. Do
not touch any board surfaces, components, or edge con-
nectars. Do not touch areas adjacent to electrical con-
tacts. When servicing the card, wear clean, white cot-
ton gloves.
If making solder repairs on the circuit board, use a flux
that is rosin RMA based. Remove the flux from these
areas when the repair is complete. Use Freon@ TMS
or TE, or the equivalent
along with plenty of clean cot-
ton swabs to remove the flux. Take care not to spread
the flux to other areas of the &it
board. Once the flux
has been removed, swab only the repaired area with
methanol,
then blow dry the board with dry nitrogen
gas.
After cleaning, the card should be placed in a 50°C low
humidity
environment
for several hours.
4.3 RELAY TEST PROGRAM
SETUP
The Model 707 comes equipped
with a test program on
disk that will test all relays of Model 7071s installed in the
mainframe. The test program will flag any relay that fails
to close when energized or open when de-energized.
ln-
structions for
using
the test program with an IBM PC or
XT, or HP 200 or 300 series computer are contained in the
Model 737 Instruction
Manual.
Perform the following
steps to configure
the Model 7071
for relay testing:
1. Remove the relay test terminal block from the rear panel
of the Model 707. This is a quick-disconnect
terminal
block and simply pulls off the rear panel terminal ship.
2. Connect the relay test terminal block to rows A and B
of any Model 7071 card installed
in the mainframe
as
shown in Figure 4-l. Note that terminals 5 and 6 of the
relay test terminal block
must
be shorted together. Ter-
minals H, Land G of row B of the Model 7U7l must also
be shorted together.
3.
Re-install the relay test terminal block into the rear panel
of the Model 707 mainframe and refer to the Model 707
Instruction
Manual to run the test program.
4-l
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