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Test
Test Name
22
DIN Keyboard
Interface
23
Centronics Interface
Note: Tests numbered: 8, 11, and 14-17 are not run during power-up.
Error Occurs During DSP Initialization or Calculating Coecients
Clear the Nonvolatile SRAM
Cycle the the analyzer's power.
After about 8 seconds, the analyzer will emit a double beep. Immediately after this double
beep, press
PRESET
he analyzer will pause after performing the CPU main self-tests and ask if you want to zero
the SRAM. (Note the caution message!) Answer YES by pressing the
the error persists.
Measure the 5 MHz Reference Signal
he DSP requires this signal from the fractional-N/reference assembly for proper operation.
his signal is routed on the backplane board. Make sure that the fractional-N/reference
assembly is pushed all the way in and making good contact with the backplane. Measure the
5 MHz signal at J101-C24 on the backplane board with an oscilloscope. If the signal is present,
refer to \ esting the DSP Circuitry" to check the DSP, or replace the CPU board.
If there is no 5 MHz signal at the backplane:
Check the reference board. If an external reference signal is used, make sure it's a 10 MHz
reference with a level of at least
If the internal 10 MHz reference is being used, check the output at A3J3 to verify
that the crystal oscillator is working. If the 10 MHz signal is not present, replace the
A3 fractional-N/reference assembly.
4-14
T roubleshoot ng and Block D agrams
Table 4-1. Analyzer Self-Tests (continued)
Errors:
DIN Keyboard test F ILED
Problem with DIN Keyboard Power Supply! Check Fuse.
Tests DIN keyboard control portion of the Super I/O.
Replace CPU board or check Super I/O chip, U607, or its clock, U606.
Errors:
Centronics port test F ILED.
Strobe bit error.
Printer reset bit error.
Printer select bit error.
Replace CPU board or check Super I/O chip, U607, or its clock, U606.
several times.
5
0
5 dBm.
Applicable Error Messages and Notes
key. Continue if
BEGIN
5
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