Table of Contents
Advertisement
Service lnformarion
5.6.2
Troubleshooting
access
In order to gain access to the r&y
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 5-6 s-aims
switch card troubleshooting.
WARNING
Lethal
voltages
are present
within
the 7001 mainframe.
Some of the pm-
cedures may expose you to hazard-
ous
voltages.
Observe
standard
safety precautions
for dealing
with
live circuits. Failure to do SD could re-
suit 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
EOII-
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.
5-18
Advertisement
Table of Contents
Troubleshooting
