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5.6
Troubleshooting
5.6.1 Troubleshooting equipment
Table 5-4 summarizes recommended equipment for
troubleshooting the Model 7012.
Table 5-4
Recommended Troubleshooting Equipment
Manufacturer
Description
and model
Multimeter
Keithley 196
Oscilloscope TEK 2243
5.6.2 Troubleshooting access
In order to gain access to the relay card top surface to
measure voltages under actual operation conditions,
perform the following steps:
1. Disconnect the connector card from the relay card.
2. Remove the Model 7001 cover.
3. Install the relay card in the CARD 1 slot location.
4. Turn on Model 7001 power to measure voltages
(see following paragraph).
5.6.3 Troubleshooting procedure
Table 5-5 summarizes switch card troubleshooting.
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Application
Measure DC voltages
View logic waveforms
WARNING
Lethal voltages are present within
the Model 7001 mainframe. Some of
the procedures may expose you to
hazardous voltages. Observe stan-
dard safety precautions for dealing
with live circuits. Failure to do so
could result in personal injury or
death.
CAUTION
Observe the following precautions
when troubleshooting or repairing
the switch card:
To avoid contamination, which could
degrade card performance, always
handle the card only by the handle
and side edges. Do not touch edge
connectors, board surfaces, or com-
ponents on the card. Also, do not
touch areas adjacent to electrical con-
tacts on connectors.
Use care when removing relays from
the PC board to avoid pulling traces
away from the circuit board. Before
attempting to remove a relay, use an
appropriate de-soldering tool, such
as a solder sucker, to clear each
mounting hole completely free of
solder. Each relay pin must be free to
move in its mounting hole before re-
moval. Also, make certain that no
burrs are present on the ends of the
relay pins.
Service Information
5-15
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