Service manual

64 Chapter 2
Troubleshooting
Perform Measurements
Spectral SNR,
Measure Spectrum
with E5040A
Noise Level is high Verify the noise level at the ‘Signal
In’ connector on the E5040A. If it is
out of limit, replace the E5040A. If it
is acceptable, specify the noise source
in the E5023A system.
Waveform Analysis
and NLTS Dipulse
Extraction / Time
Correlation
Measurement
Measurement data is
unacceptable
Check the SMA - BNC cable which is
connected with ‘Fltrd Out 4’
connector on the E5036A and ‘Ch1’
connector on the Oscilloscope. If
cable connection is good, perform the
self test. If the self test fails, replace
the Oscilloscope.
Measurement with
54845A/B
Oscilloscope
Error message
“Timeout occurred”
appears on the PC
monitor.
Check the BNC - BNC cable which is
connected with ‘TRG OUT 1’
connector on the E5035B and
‘Ch2(3)’ connector on the
Oscilloscope. If cable connection is
good, verify the trigger level at the
TRG OUT 1. If it is wrong, replace
the E5035B.
Write or Read Head
DCR Measurement
Measurement data is
unacceptable
Check the MDR-MDR cable
connecting the ‘Head Amp Ctrl Unit
I/F’ connector on the E5035B and
‘E5035B I/F’ connector on the
E5043A/C. If cable connection is
good, replace the E5035B, E5043A/C
and head amplifier in sequence.
One of the Head DCR
is acceptable, but
another Head DCR is
unacceptable.
It is assumed that connection with the
connection board (E5029K) and
HGA cassette is poor.
Track Profile No Peak Same as R/W offset
NLTS 5th
Measurement
Measurement data is
unacceptable.
If the measurement data with
precompensation is wrong in spite of
the it without precompensation is
acceptable, it is assumed that the
precompensation part within the
E5037C/D gives any problems.
Replace the E5037C/D.
Bit Error Rate
Measurement
measurement data is
unacceptable.
If Bit Error Rate measurement data is
wrong, replace the E5039B/C.
Table 2-11 Trouble Isolation Hints