
Troubleshooting and Block Diagrams 8712ET/ES and 8714ET/ES
Category 1 Failures: Dead or No Display RF Network Analyzers
4-14 Service Guide
8 (number not used) Test number not used because test status LED powers up
with this as default. An “8” on the LED indicates the 68030
was unable to power-up and execute basic instructions.
Check power supplies. If power supplies are good, then
replace CPU board.
9 DSP SRAM Errors: same as for test #4.
Checks program SRAM used by the digital signal processor.
Typical memory size about 65536 bytes. Replace CPU board,
or check SRAM chips U716 and U717, and chips U704,
U705, and U713.
10 320C32 DSP
Processor
Test not implemented.
11 68030 &320C32
Communication
Test not implemented.
12 Backplane Bus Errors:
Reference clock not toggling.
Unable to gain control of DSP bus.
Cannot perform backplane bus tests.
Access error: wrote <num>, read <num>,
right shift=<num>
Source board: Failed self-test.
Receiver board: Failed self-test.
Test reads version numbers from fractional-N/ref, source,
and receiver boards.
Checks for 5 MHz clock from fractional-N/reference board.
Make sure all boards are pushed in and making good contact
with backplane.
Check 10 MHz output from A3J3. If not found, see
“Troubleshooting the Fractional-N/ Reference Board (A3)” on
page 4-30. Replace CPU board or check U807, U810, and
U811.
13 Non-volatile SRAM Errors:
SRAM battery test FAILED - Saved states lost.
SRAM battery test ERROR - Cannot access SRAM.
Tests integrity of battery-backed SRAM; detects loss of
power to SRAM.
Writes/reads pattern to part of SRAM.
Remove CPU board and measure voltage on battery BT301;
replace if below 2.2 volts. Replace CPU board or check the
U327 and U100 controller, U329 and U330 SRAM, and U325
voltage regulator.
14 LAN Tests the operation of the LAN circuitry.
Replace U1020.
Test Test Name Applicable Error Messages and Notes
Note: Tests numbered: 8, 11, and 14−17 are not run during power-up.
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