HP 7936 Support Manual page 130

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Troubleshooting and Diagnostics
7936 and 7937
need not be disconnected from power distribution
PCA-A5 and read/write PCA-A2. A voltmeter
probe can be inserted into the openings on the rear
of the connector. Figure 8-3 lists the voltage and
ripple limits for the power supply output voltages.
NOTE
There are no adjustments for the power
supply output voltages.
Power supply output signals Power On Reset
POR-L and Power Fail PF-L can be monitored at
pins I and 2. respectively. of connector 15 on
PCA-A5. See figure 8-3.
8-21. SERVO TEST POINT PCA
Servo test point PCA, part no. 07937-60208, allows
a number of servo system digital and analog signals
to be monitored with suitable test equipment,
while the drive is in operation. See figure 8-4. To
install the PCA in the drive, proceed as follows:
a. Extend the anti-tip feet on the cabinet.
b.
Extend the drive out of the cabinet on its rack
slides.
c. Remove the two T9 screws which secure the
access cover for servo PCA-AI to the top of
the drive and remove the cover. The location
of the cover is shown in figure 9-1, item 81.
d.
Plug the servo test point PCA into the 50-pin
connector on PCA-AI, visible through the
8-8
opening in the top of the drive.
The mnemonics used in figure 8-4 to identify the
test PCA signals are described in table 8-3. The
test points are identified by number in the servo
system functional diagrams
II
and
II
in chapter
12.
8-22.
READfWRITE TEST POINT PCA
Read/write test point PCA, part no. 07937-60209,
allows a number of read/write system digital and
analog signals to be monitored with suitable test
equipment, while the drive is in operation. See
figure 8-5. To install the PCA in the drive, proceed
as follows:
a. Extend the anti-tip feet on the cabinet.
b.
Extend the drive out of the cabinet on its rack
slides.
c. Remove the two T9 screws which secure the
access cover for read/write PCA-Al and con-
troller PCA-A6 to the top of the drive and
remove the cover. The location of the cover is
shown in figure 9-1, item 81.
d. Plug the peA into the 16-pin connector on
PCA-A2, visible through the opening in the top
of the drive.
The mnemonics used in figure 8-5 to identify the
test PCA signals are described in table 8-4. The
test points are identified by number in the
read/write system functional diagram
III
in chap-
ter 12.