Electrical Measurement - Sharp SC-103H Service Manual

14. CASSETTE HOLDER FALL TIME ADJUSTMENT (Refer to Fig. 32)
1) Check that the cassette tape exact-
ly falls into the cassette holder
(112) when inserted.
For adjustment, refer to the figure.
\
075
ADJUSTING SCREW
Figure 32
ELECTRICAL MEASUREMENT
SPECIAL EQUIPMENT REQUIRED
The following items will be required for performing electrical checks and adjustments:
1. DC constant-voltage power source (DC 20.0V)
DC voltmeter (DC 20V)
V.T.V.M.
Frequency counter
Signal generator
Attenuator
Distortion meter
Test tape (MTT-113, 6.3kHz recorded)
Oscilloscope
8 ohm dummy resistor (5%, 10W)
Test tape (MTT-112, 333Hz recorded)
Test tape (MTT-117A 63Hz, 1kHz, 8kHz recorded)
Blank tape
AC ammeter
Band Pass Filter (1 kHz)
CPN ANAwWD
eRe PP Pe
WRoONES
—_
POWER AMPLIFIER CHECK (Refer to Fig. 33)
1) Set Mode Selector Switch (SW-8) at "CASSETTE PLAY".
2) Set VOLUME Control (R207, R208), RECORD MONITOR VOLUME Control (R213, R214) in the minimum
position, and BASS Control (R209, R210) and TREBLE Control (R211, R212) in the central position.
3) Connect DC constant voltage power source (DC 20.0V) to the power lead wire of main amplifier.
4) Connect PLUS side of DC voltmeter to TP101 (TP102) and MINUS side to TP2. Adjust R307 (R308) so that the
voltmeter's reading becomes 10.0V.
5) -Connect PLUS side of DC voltmeter-to TP103 (TP104) and MINUS side to TP105 (TP106). Adjust R317 (R318)
so that voltmeter's reading becomes 20mV.
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