Fluke 900 User Manual
Page 37
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FLUKE 900 SERVICE MANUAL
Selftest
b2 - HW oscillator (25MHz) is too slow. There are several possible causes. The
25MHz crystal could be oscillating at the wrong frequency, almost any of the
4 frequency chips coiild be bad, the 2925 clock generator could be bad, there
could be a problem in the frequency muxes.
bl - No results obtained from freq read. The test has timed out Something is
wrong with the CPU - CIO interface.
bO - Unable to set up the frequency read. Something is wrong with the CPU -
CIO interface.
BYTE 3
b7-
b6-
b5
b4
b3
b2-
bl
bO
The active low duty cycle measured was too long. There are several possible
causes. The 25Nfflz crystal could be oscillating at the wrong frequency,
almost any of the 4 frequency chips could be bad, the WSG pal could be
faulty, the 2925 clock generator could be bad, there could be a problem in
the frequency muxes.
The active low duty cycle measured was too short. There are several possible
causes. The 25MHz crystal could be oscillating at the wrong frequency,
almost any of the 4 frequency chips could be bad, the WSG pal could be
faulty, the 2925 clock generator could be bad, there could be a problem in
the frequency muxes.
No results obtained from low read. The test has timed out. Something is
wrong with the CPU - CIO interface.
Unable to set up the low read. Something is wrong with the CPU - CIO
interface.
The active high duty cycle measured was too long. There are several possible
causes. The 25MHz crystal could be oscillating at the wrong frequency,
almost any of the 4 frequency chips could be bad, the WSG pal could be
faulty, the 2925 clock generator could be bad, there could be a problem in
the frequency muxes.
The active high duty cycle measured was too short. There are several
possible causes. The 25MHz crystal could be oscillating at the wrong
frequency, almost any of the 4 frequency chips could be bad, the WSG pal
could be faulty, the 2925 clock generator could be bad, there could be a
problem in the frequency muxes.
No results obtained from high read. The test has timed out. Something is
wrong with the CPU - CIO interface.
Unable to setup the high read. Something is wrong with the CPU - CIO
interface.
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