JVC RC-W305, Руководство по обслуживанию

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RC-W305
7
e. FM Adjustment Band switch : FM FM Dummy antenna : 75 ohms unbalance
Adjusting Connection position of VTVM
Circuit Input Output tuning dial Oscilloscope
Connect sweep
1 IF generator to IC101 10.7 MHz Low T101
~
T103
(18)PIN(A)
2 Tuning Connect FM SG to Connect VTVM to 87.4 MHz Low end L103
3 coverage FM ANT & D105(-) speaker terminals. 108.4 MHz High end PVC101-C1
4 Connect FM SG to Connect VTVM to 90.0 MHz 90.0 MHz
L102
5 FM ANT &D105(-) speaker terminals. 106.0 MHz 106.0 MHz PVC101-C2
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 Take-up torqe Back tension Tape tension
Drive-power cassette
Cassette ofr PLAY:TW-211A PLAY: TW-2111A
measurement F.FWD/REW:TW-2231 TW-2412
PLAY 30-60 gr.cm 2.0 - 4.5 gr. cm 60 gr or more
F.FWD 55-120 gr.cm ------ ------
REW 55-120 gr.cm ------ ------
Step SG Frequency
Tracking
Max.
Max.
Adjustment
Connect sweep
generator to
IC101(24)pin (B)