MOD E L 3S62A
S E RV I C E
8-7 A3 PRO(iRAM ROM
The information in this section shou ld be used to isolate faulty subblocks on the A3 Program
ROM assembly. All procedu res assume that the Fault Isolation proced ures of Section V I I
were used to determ ine that this board has fai led and that the C ircu it Descriptions of
Section VI are u nderstood.
WARNING
Service procedures described in this section are performed with
protective covers removed and power applied. Hazardous voltages
in these circuits can cause personal injury if contacted.
CAUTION
Do not insert or remove any circuit board in the HP 3562A while
power is on. Power transients caused by insertion or removal may
damage the circuit boards.
How to Use This Section
Ref.erence
Afh�r-Repair
Start troubleshooting with part A, Program ROM Diagnostics.
Refer to Section IX for the component locators and schematics. refer
to figu re 4-1 in Section IV for location of cables and boards.
Use tab le A3-3 to determine which adjustments and tests need to be
performed to complete instrument service.
Troubleshooting Hint
The ROM board is very sensitive to changes in + 5 V. Check this voltage before proceeding
with the rest of this section.
A. IProgram ROM Diagnostics
The PROG ROM test runs at turn-on. Table A3-1 lists and explains the A2 LED annunciations
of test fai lures. The test seq uence fol lows:
1 . Verifies system bus. This is done by echoing data from the FFT board. I f the FFT board
is not present, the system bus can not be verified.
2. Verifies ROM bus. The system CPU reads the contents of two locations in the lowest
ROM pair and verifies that they are correct. One number is the comp lement of the
other so that a l l ROM bus l ines are toggled. If this test fails, the LED annunc iations
also indicate whether the system bus was verified.
8-39
Содержание 3562A
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