JVC RC-W305 Service Manual page 7

e. FM Adjustment
Adjusting
Step
Circuit Input
Connect sweep
generator to
1 IF
IC101(24)pin (B)
2 Tuning Connect FM SG to
3 coverage FM ANT & D105(-)
4 Connect FM SG to
Tracking
5 FM ANT &D105(-)
偩.TAPE DECK ADJUSTMENTS
1. HEAD REPLACEMENT
After replacement, demagnetize. the heads by using a degausser.
Be sure to clean the head before attempting to make any adjustments.
All wiring should be returned to the original position after work is completed.
2. HEAD AZIMUTH ADJUSTMENT
(1) Load the test tape(VTT-703, etc., 10 KHZ) for azimuth
adjustment.
(2) Press the PLAY button.
(3) Use a cross-tip screwdriver to turn the screw for azimuth
adjustment so that the left and right output are maximized
(4) Press the STOP button.
(5) After completion of the adjustment, use thread lock(TB-1401B)
to secure the azimuth-adjustment screw.
3. MOTOR SPEED ADJUSTMENT
(1) Insert the test tape(MTT-111N, etc., 3,000 HZ)
(2) Press the PLAY button.
(3) Use a flat-tip screwdriver to turn the SVR(located inside the
rear of the motor) to adjust SVR so that the frequency counter
become 3,000 HZ
4. CHECKING THE MECHANISM TORQUSE AND TENSION
Clean the head, capstan and pinch roller making any measurement.
Measurement
Cassette ofr
measurement
PLAY
F.FWD
REW
Band switch : FM
Connection
Output
Connect sweep
generator to IC101
(18)PIN(A)
Connect VTVM to
speaker terminals.
Connect VTVM to
speaker terminals.
Take-up torqe
PLAY:TW-211A
F.FWD/REW:TW-2231
30-60 gr.cm
55-120 gr.cm
55-120 gr.cm
FM Dummy antenna : 75 ohms unbalance
position of
SG Frequency
tuning dial
10.7 MHz Low
87.4 MHz Low end
108.4 MHz High end
90.0 MHz 90.0 MHz
106.0 MHz 106.0 MHz
Back tension
PLAY: TW-2111A
2.0 - 4.5 gr. cm
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7
RC-W305
VTVM
Adjustment
Oscilloscope
T101~ T103
L103
Max.
PVC101-C1
L102
Max.
PVC101-C2
Tape tension
Drive-power cassette
TW-2412
60 gr or more
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