HP HP-97 - Page 112

Component-Level Maintenance HP-97
Table 4-15. Card Reader Troubleshooting Procedure (Continued)
STEP ACTION
11.
Monitor the voltage across the
motor. Insert a card. If the motor voltage,
VM > 2V, replace the motor.
Then go to step 12.
If not, replace the sense amp.
Then go to step 12.
12.
Insert a card. If the motor starts, return to
step 2.
If not, replace ROM 6. Insert a
card.
If the motor starts, return
to step 2.
If not, check the traces.
Then return to step 9.
13.
Perform the following procedures
in sequence using an oscilloscope
set to 2 V/div vertical gain and
1 msec sweep.
a.
Monitor
the
head
switch
(TP11
to
If
the
oscilloscope
shows
clean
TP8). Turn the head switch ad- switch action, go to step 13b.
justing screw until the trace
goes off the screen. Then back If not, see note below.
the screw off 1/8 turn.
b. Monitor the protect switch (TP10 If the oscilloscope shows clean
to TP8). Turn the protect switch switch action, go to step 13c.
adjusting screw until the trace
goes off the screen. Then back If not, see note below.
the screw off 1/8 turn.
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