6-10
REMOVING AND
REPLACING THE A16
OR A17 PCB
This paragraph provides instructions for removing and replacing the
A16 CPU Interface PCB or the A17 CPU PCB, both of which are lo-
cated in the CPU housing assembly (see Figure 6-3).
Preliminary
Disconnect the power cord from the unit and remove
the top cover as described in paragraph 6-2.
Procedure
Remove and replace the A16 or A17 PCB as follows:
Step 1
Remove the CPU cover and set aside.
Step 2
Lift up on the edge tabs of the PCB and
lift it out of the CPU housing.
Step 3
To replace the PCB, reverse the removal
process.
6-11
REMOVING AND
REPLACING THE A18
OR A19 PCB
This paragraph provides instructions for removing and replacing the
A18 Power Supply PCB or the A19 AC Line Conditioner PCB, both of
which are located in the power supply housing assembly (see Figure
6-3).
Preliminary
Disconnect the power cord from the unit and remove
the top cover as described in paragraph 6-2.
WARNING
When power is removed from the instrument, always allow
five minutes for the capacitors on the A21 Line Filter/Recti-
fier PCB to discharge before removing either the A18 or A19
PCB.
Procedure
Remove and replace the A18 or A19 PCB as follows:
Step 1
Remove the power supply cover and set it
aside.
Step 2
If the A19 PCB is being removed, (1) dis-
connect the cable assembly from the A21
Line Filter/Rectifier PCB at A19P2 and
(2) remove the Nylatch fastener used to
connect the PCB to the housing assembly.
Step 3
Lift up the edge tabs on the PCB and lift
it out of the power supply housing.
Step 4
To replace the PCB, reverse the removal
process.
690XXB/691XXB MM
6-13
REMOVAL AND
A16 OR
REPLACEMENT PROCEDURES
A17 PCB
Summary of Contents for 680 C Series
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