Advertisement
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
I F
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
Advertisement
