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|  (6) Tuning unit 4.
Probable trouble
Correction
Symptom
Step
Same as for step 1, tuning unit 1.
Defective connection at terminal
1
Tuning unit 4 interconnected
A2 on connector P501 (fig. 72).
through test harness to main
Poor or no connection between
Same as for step 1, tuning unit 1.
unit; POWER switch at ON;
subminiature connector plug
IMPULSE GENERATOR DB
P515, at harness end of wires
above 1V/MC switch at ON;
running from receptacle P501,
impulse generator output con-
to connector J2 on detector and
trols fully clockwise; but no
electrometer assembly A501.
meter indication at either posi-
Same as for step 1, tuning unit 1.
Poor or no connection between
tion of FREQUENCY RANGE-
protruding coaxial connector
MC switch.
plug P514, on if. amplifier
subassembly (fig. 76), and
coaxial connector jack J1, on
detector and electrometer
assembly A501 (fig. 72).
Check P502 and J201 for secure
Poor or no connection between
mechanical and electrical con-
connector plug P502, which
nection.
terminates coaxial cable from
terminal A2 on P501 (rear of
chassis), and mating jack J501
or right-angle adapter CP504
Poor or no connection between
Check P503 and J502 for secure
connector plug P503 of right-
mechanical and electrical connec-
angle adapter CP504 and input
tion. If this does not remedy trou-
jack J502 of coaxial switch
ble, check inner conductor of
CP504 for continuity from J501 to
S501.
P503. Also check for infinite
resistance between inner conduc-
tor of CP504 and outer shell.
Replace if defective.
Check for secure connections of
No driving power from rf tuner to
42-mc if. preamplifier (fig.
coaxial cables terminating in
plugs P507 and P509. Be sure
that connector plug P507 securely
mates if. preamplifier jack J507;
and that plug P509 securely mates
if. preamplifier input jack J509;
if this does not remedy trouble,
suspect other faulty cable connec-
tions.
No driving power from if. pre-
Check for secure connections of
amplifier to if, step attenuator
cable assembly W502. Be sure
that connector plug P511 mates
AT501 (fig. 72).
if. preamplifier output jack J511
mates if. step attenuator jack
AT501J1 (fig. 72). If this does
not remedy trouble, disconnect
cable assembly W502 and check
inner conductor of cable assem-
bly W502 for continuity between
P511 and P512. Also check for
infinite resistance between inner
conductor and outer shell.
Repair or replace cable assem-
bly W502 if defective.
Check for secure connection of con-
No driving power from if. step
attenuator AT501 (fig. 72) to
nector plug P513 to mating jack
if. preamplifier (fig. 76).
AT501J2 on if. step attenuator
coaxial cable is soldered to ter-
mination CP503 at input to if.
amplifiler (fig. 76). Check and
141
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