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 TM 11-6760-238-34
CHAPTER 4
GENERAL SUPPORT MAINTENANCE
Section I. GENERAL SUPPORT TROUBLESHOOTING
b. Bridge, Impedance, General Radio Type 1650A
WARNING
ANfURM-190.
When troubleshooting or making repairs
4-2. Organization of General Support
on Test Set, Control Panel, Focal Plane
Shutter LS-78A, be extremely careful.
Troubleshooting Procedures
Use insulated test probes when making
General support troubleshooting procedures include all
the required voltage measurements.
troubleshooting performed at lower levels in addition to
Always disconnect the power cord from
the
information
contained
in
this
chapter.
the test panel before touching any of the
Troubleshooting table 4-1 lists possible malfunctions that
internal parts. Ground all points of high
cannot be remedied with the maintenance facilities
potential to ensure any residual voltages
allocated to lower levels. Unless the trouble has been
are removed. Make certain that you are
specifically localized or isolated, perform applicable
not
grounded
when
making
troubleshooting procedures given in TM 11-6760-238-12.
measurements or adjustments inside the
4-3. General Support Troubleshooting Procedures
test set.
Do not deviate from
Steps referenced in the malfunction column refer to the
recommended procedural steps.
operational check (para 3-5)
4-1. Tools and Test Equipment Required for
NOTE
General Support Troubleshooting
Refer to the schematic diagram (fig.*
In addition to the tools and test equipment listed in
when troubleshooting the equipment.
a. Oscilloscope ANIUSM-281C
Table 4-1. General Support Troubleshooting
SYMPTOM
PROBABLE TROUBLE
CORRECTIVE ACTION
1.
NO + 28 VDC MEASURED AT VOLTMETER BINDING POSTS J14 AND J15 (step 2), DC POWER LAMPS ON
Defective MASTER switch S3
Replace MASTER switch (para 4-6 h and l)
2.
NO + 19 VDC MEASURED AT VOLTMETER BINDING POSTS J14 AND J15 (step 3), DC POWER LAMPS ON.
Defective MASTER switch S3
Replace MASTER switch (para 4-6 h and i)
3.
NO + 13 VDC MEASURED AT VOLTMETER BINDING POSTS J14 AND J15 (step 4), DC POWER LAMPS ON
Defective MASTER switch S3
Replace MASTER switch (para 4-6 h and i)
4.
NO + 6 8 VDC MEASURED AT VOLTMETER BINDING POSTS J14 AND J15 (step 5), DC POWER LAMPS ON
Defective MASTER switch S3
Replace MASTER switch (para 4-6 h and l)
5.
NO + 4 2 VDC MEASURED AT VOLTMETER BINDING POSTS J14 AND J15 (step 6), DC POWER LAMPS ON
Defective MASTER switch S3
Replace MASTER switch (para 4-6 h and l)
6.
NO + 6 2 VDC MEASURED AT VOLTMETER BINDING POSTS J14 AND J15 (step 7), DC POWER LAMPS ON
Defective MASTER switch S3
Replace MASTER switch (para 4-6 h and a)
4-1
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