
8712ET/ES and 8714ET/ES Troubleshooting and Block Diagrams
RF Network Analyzers Category 1 Failures: Dead or No Display
Service Guide 4-13
Table 4-1 Analyzer Self-Tests
Test Test Name Applicable Error Messages and Notes
1 680x0 Processor Errors begin with “CPU TEST FAIL.”
Remove CPU board, and check U105, U106, and TP103
(CPU clock). Then check U121 and U122. If test still fails,
replace CPU board.
2 BootROM Checksum Errors:
Bad checksum table at …
ROM Checksum Failure in bank…
Checksum Table is Blank. ROM may be blank.
Unexpected ROM Id at <num>.
Bad ROM count in Checksum table…
Bad ROM size in Checksum table…
This tests checksum of bootROM chip. Replace CPU board or
U335.
3 Main ROM
Checksum
Errors: Same as for test #2.
This tests checksum of main flash EPROM. Reload firmware
from floppy disk. If test still fails, replace the CPU board or
check U301 and the EPROM chips U302-U305 or U308 and
U309 (whichever are loaded).
4 DRAM Errors:
Memory size too small.
Bus error.
At address <num>, write <num> read <num>
RAM bit errors: <num>
RAM refresh errors: <num>
Test writes/reads test patterns. Checks reported size of
DRAM on power-up display. Memory size should be about
32 MB.
Replace CPU board or check the following:
DRAM control circuitry U412-U414, DL401
DRAM data interface chips U406-U409, U421-U424
DRAM address MUX U427-U432
DRAM SIMM (J401)
5 (Not used)
6 340x0 GSP Processor Test not implemented.
7 GSP Video Test not implemented.
Note: Tests numbered: 8, 11, and 14−17 are not run during power-up.
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