TM 32-6625-022-24&P
Table 4-2. Direct and General Support Maintenance Tools and Test Equipment - Continued
Use
Item
NSN
Adjustment of RF power output.
RF power meter type 6685
with adaptor type N685-2 (77327)
Connect equipment for trouble-
RF coaxial cable, adaptors,
shooting and alignment procedures.
junctions, etc.
Interconnection.
RF coaxial cable assembly
50 OHM.
Section III. TROUBLESHOOTING
of the sweep generator subassemblies; figures 4-5 through
tional troubleshooting flow charts containing some of the
4-11 show the schematics of the various subassemblies.
more common problems. They are to be used as a general
The main schematic diagram (FO-1) is located in the back
guide in troublehshooting. Once a circuit or stage has been
of this manual.
localized, transistor bias, supply voltages, and forward and
revere resistance measurements can be used to deter-
mine the faulty component. Any trouble that is beyond
4-6 COMPONENT LOCATION. For component location
the scope of Direct and General Support Maintenance
refer to Appendix C.
shall be referred to a higher level of maintenance. Study
the appropriate theory and related schematics before
troubleshooting the equipment.
Section IV. MAINTENANCE OF SWEEP SIGNAL GENERATOR SG-677/U
or replaced at this level of maintenance. Exercise normal
precautionary measures to prevent damage to printed
subassenblies listed below malfunction, they will be re-
placed, in their entirety, and no attempt will be made to
circuitry, heat sensitive components, etc. Also exercise care
repair them.
in physically orienting the plug-in printed circuit boards,
diodes, transistors, and polarized capacitors. For parts
location refer to Appendix C.
b. UHF/VHF Range Switch.
c. VHF Subassembly.
of sweep generator
d. Motitor/Mixer Subassembly.
e. RF Attenuator.
should be performed when:
g. RF Detector.
a. A repair or replacement of a subassembly has been
performed and can be used to determine its serviceability.
4-8 SUBASSEMBLY REPAIR. When any other sub-
b. Six months have elapsed since the last adjustment.
assembly or component malfunctions, it may be repaired
