TM 32-6625-022-24&P
DIRECT AND GENERAL SUPPORT MAINTENANCE
Section I. GENERAL
(5) RF POWER
0.5 VRMS
voltage and waveform measurement data; troubleshooting
0 DB
(6) RF ATTENUATOR
instructions; directions for removal, repair, and replacement
or installation of components; and electrical test procedures
ON
(7) INT MARKER
for Sweep Signal Generator SG-677/U. Section I contains
a voltage test point table and waveform diagrams. The
MID RANGE
(8) INT MARKER SIZE
took and test equipment required for direct and general
support maintenance are listed in Section II. Trouble-
MID RANGE
(9) EXT MARKER SIZE
shooting procedures are included in Section III; Section
IV contains instructions for performing the corrective
1000 MHz
(10) FREQUENCY
maintenance indicated by the results of troubleshooting.
Setion V conatins procedures that establish acceptable
1000 MHz
(11) FINE TUNING
performance standards for the sweep generator.
4-2 WAVEFORM DIAGRAMS AND VOLTAGE MEA-
WARNING
SUREMENTS
Be extremely careful when performing trouble-
a . Purpose and Use. Waveform diagrams are used to
shooting procedures; dangerous voltages are
localize malfuction to a particular function, module,
present in the equipment.
or single Stahe of a complex circuit. Voltage measure-
ments can then be used to isolate a fault to a defective
circuit element. Figure 4-1 cotains a set of waveforms.
CAUTION
and equipment conditions are listed.
This equipment is transistorized. When mea-
b. Initial Settings. Set all controls on sweep genera-
suring voltages, use tape or sleeving to insulate
tor as follows (refer to figure 1-1):
the entire test probe, with the exception of the
extreme of the tip. A momentary short can ruin
ON
(1) POWER
a transistor.
VAR
(2) SWEEP RATE
CAUTION
WIDE
(3) SWEEP WIDTH
Before using any multimeter to make resis-
tance measurements, be sure power is off.
( 4 ) RANGE
UHF
Normal
Test
Normal
Test
point
point
condition
condition
+205 Vdc
+36 Vdc
TP 9
TP 1
TF 10
+83 Vdc
+36 Vdc
TP2
