Sony CRF-150 Service Manual page 4

Trouble Band Symptom Cause Remedy
Oscillation | FM 1) Oscillating noise | 1) Coupling between | 1) Separate 1319 from
1319 and СЕЗІ. CF301
2) Oscillating noise | 2) °S" curve is too | 2)Lower the curve
sharply adjusted level
3) Oscillating noise | 3) Leads from the tuner | 3) Separate the leads from
and antenna to 5301-2 | the printed circuit board.
disturb te if stage.
Tuning FM Pointer does not | Leaky G77 between | Replace C377.
meter move. IFT F301 and 5301-8.
MW
Minimum pointer | R313 misadjusted.
Readjust R313 for 0.25 to
movement. 028V at the emitter of
0303.
Wrong FM 1) Pointer docs mot aide | 1) Make the pointer side
dal
properly.
more smoothly.
pone 2) Incorrect frequency | 2) Readjust the frequency
indication
pem
w.
Mw
T) Incorrect
frequency | 1) Readjust the frequency
coverage.
coverage.
2) Backlash 2) Loose screw on the | 2) Engage gears, and tighten
double gear. the screw.
sw2-10
1) Loose core in the first | 1) Fix the core with an
oscillator сой. elastic band, or replace
the coil
2) Normal when | 2) Damaged second oscil- | 2) Replace the сой.
the core of the | Шогсой.
second oscillator
coil is pulled
ош.
Unstable 392-16 | 1) No reception | D Faulty or beni жаза | 1) Repair or straighten the
reception when the band | іп the turret tuner. | contact
selector is turned
counterclockwise.
Normal тесер.
tion when these-
lector is ішпей
clockwise.
2) Reception okay | 2) Imperfect solder joint. | 2) Resolder the defective
joint.
Battery cur- | АШ
'Shorted 0502.
Replace 0502
rent flows voltage at any point
when ac in the circuit.
power sup-
ply isop-
erating.
Reverse Lw Connect the cut foil with
operation
on the low fre | CF302
and CF303 is cut. | a jumper lead.
of the quency range.
SELECTIV-
ITY switch.
FM tuning | FM Tight dial Defective gear Deepen gear teeth, and
shaft gear
apply lubricating oil
skips.