Model 8901B
llable
8B-4.
Measurement Progress
Error
Codes
Service
Error
Code
44
I
46
48
50
52
54
56
58
Flow
Chart
Segment
Non-Measurement Display
Measurement Display
Set Up Hardware
Frequency Tuning
Signal Leveling
Audio Ranging
Measure
Manipulate
1
60
I
Exit Manipulate
Service Error Messages (Errors
65
through
89)
These Service Error Messages are quite diverse and are enabled in three ways.
1.
Special Function 43.1 enables the Service Error Messages and allows the AUTOMATIC
2. Special Function 43.2 enables the Service
Error
Messages but does not allow AUTOMATIC
3.
Special F'unction 43.N enables the measurement
to
pause
or
halt when the Service Error Message
second) when
a
specified Service
Error Message occurs, key in 43.N SPCL, where
N
is
the Service Error Message code. After
pausing and displaying the Service Error Message code, the measurement will continue on.
b.
To
cause the measurement
to
halt when a specified Service Error Message occurs, key in 43.N
SPCL, where N is the specified Service Error Message code plus 100. Once the measurement
is halted, pressing any key will terminate the halt feature unless testpoint
TEST
A
on the
A13
Controller Assembly
is
grounded.
If
the testpoint
is
grounded, pressing any key allows the
measurement to proceed until the error is encountered again (permitting single-stepping
of
the
measurement cycle). Press the AUTOMATIC OPERATION key rapidly twice in succession to
exit this function.
OPERATION key to clear them.
OPERATION
to
clear them.
specified by N
or
100 minus N
is
encountered. The
two
alternatives are
as
follows:
a. To cause the measurement to pause (approximately
The Service
Error
Messages are as follows:
Error
70.
Phase Lock Loop Step-Down.
The LO phase lock loop has stepped to a lower harmonic
of
the LF
VCXO
in an attempt to tune the LO to the required frequency. Stepping down once
is
occasionally necessary during normal tuning. See Service Sheet BD2 and
Service Special
Ihnction
54
in paragraph
8-7.
Error
71.
Phase Lock
Loop
Step-up.
This error message
is
the same as
Error
70
except that the loop
has stepped to a higher harmonic.
Error
72.
Audio Overload.
The Audio Overvoltage Detector has tripped. This may have been due to
the nature of the audio signal
(for
example, a high-frequency audio signal which overrides the circuits
preceeding
a
low-pass filter)
or
due to a problem in the audio circuits. See Service Sheet BD4.
Error
73.
No
IF
Signal Found after Finding an
RF
Input.
An RF input signal has been sensed by the
Peak RF Level Detector but no
IF
signal has been sensed by the
IF
Level Detector. See Service Sheets
4 and 9.
Error
74.
FM Calibrator Underdeviation.
The frequency deviation of the FM Calibrator
is
less than
30
kHz. See Service Sheet 29.
Error
75.
FM
Calibrator Overdeviation.
The frequency deviation
of
the FM Calibrator
is
greater than
38
kHz. See Service Sheet
29.
Error Messages
8B-15
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