HP 35601A Operating And Service Manual page 90

6-28. HP-IB Test with Digital Signature Analysis
This test checks the operation of the digital control circuitry on the Al Board. The program
executes a routine that will generate predictable signatures at various points in the circuit if
the circuit is working properly. Figure 6-20 shows the circuit diagram for the HP-IB control
portion of the Al Board. After initializing the test, simply check for the proper signatures at
all the indicated points in the circuit. Chances are quite good that if all the previous tests
have passed, the circuitry checked in this test is working properly. This test passes if all the
signature readings are correct.
NOTE
If you find that the -hp- 35601A is not responding to HP-IB com-
mand. proceed directly to Service Group Four (Al • HP-IB control
and Power Supply). The HP-IB handshake circuitry must be
working be/ore this test can be of any use.
eTest
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Alk-i
IB INTERFACE 03S601 6SS01
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With the Low Frequency Menu displayed, press SFK K7 to initialize the test. After initializa­
tion, follow the instructions displayed on the computer. This test will not be initialized in the
automatic mode.
What if the Test Fails?
If this test fails, check the circuitry around the faulty signatures. If the handshake circuits
are working, the problem is probably in one of the latches or multiplexers; this type of prob­
lem should be easy to isolate with signature readings. If the handshake circuits are not work­
ing, probably none of the signatures on the board will be correct. Refer to Service Group
Four for troubleshooting techniques of the handshake circuitry. Also refer to Service Group
Four for schematics, component locators, and circuit descriptions.
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'LISTEN INDICATOR
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Figure 6-20. HB-IB Test with Digital Signature Analysis
COP HUGH I 1981 BT HEW.ETT-PACKARD COWANY ~ " 3S60J I A l l
HB-IB Test with Digital Signature Analysis
6-45