HP 3320A Operating And Service Manual page 96

Replace A24 if output amplitude only is incorrect.
Replace A23 if output frequency only is incorrect.
Replace A23 and A24 if both output frequency
and output amplitude are incorrect.
II
b. If the unit fails any test, replace the board
indicated for that test. If the unit passes the
tests, proceed to Steps c thru e.
Insert Diagnostic Card No.5.
3320A-D-2958
a. Perform the tests outlined in Tables 3 through
5.
d. !nsert Card No.1. The logic code should be
l·b·' at XA37 pin 12 and O-b-O at XA37 pin
13. If the unit fails this test, replace A37.
e. If the unit passes all tests, replace A25.
13
NO
f------o~--------;~
c.
~~~~~g~Cia~On~:t~~o~~~d b~oi_ktt,f~~7c~~e ~~
not correct, replace A23. If the code is
correct, go to Step d.
Are pin states as shown inTable 2?
b Insert Diagnostic Card No.1.
a. Connect logic probe to XA37 pin L.
b. Check pins listed in Table 2 with logic probe.
a. Insert Diagnostic Card No.2.
RepiaceA37 Is XA36 pin 15 high? lsXA24 pin Y high?
b. Check pins listed in Table 1 with logic probe.
a. Insert Diagnostic Card NO.1.
Go to 3260A Troubleshooting Trees.
a. Disconnect the Card Reader from the 3320B.
Check the following pins on XA37 ; they
should all be high: 3,4,5,6,7,8,9,10,11,
R. If they are all high, go to Step b. If they
are not all high, replace A37.
b. Reconnect the 3260A Card Reader to the
3320B. Using the logic probe and Table 6,
determine if the Card Reader is functioning
properly.
26
Enter here.
Figure 7-1. System Component Isolation And GPI B Troubleshooting Tree.
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