13.1. Cassette Deck Section
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Measurement Condition
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Reverse-mode selector switch:
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Deck Tape Select: NORMAL
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Make sure head, capstan and press roller are clean.
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Judgeable room temperature 20 ± 5 °C (68 ± 9°F)
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Measuring instrument
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EVM (DC Electronic voltmeter)
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Digital frequency counter
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Test Tape
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Tape speed gain adjustment (3 kHz, -10 dB);
QZZCWAT
13.1.1. Tape Speed Adjustment (Deck 1/2)
1. Insert the test tape (QZZCWAT) to DECK 2 and playback
(FWD side) the middle portion of it.
2. Adjust Motor VR (DECK 2) for the output value shown
below.
Adjustment target: 2910 ~ 3090 Hz (NORMAL speed)
3. After alignment, assure that the output frequency of the
DECK 1 FWD are within ±60 Hz of the value of the output
frequency of DECK 2 FWD.
Fig. 1
13.1.2. Bias Voltage Check
1. Set the unit “AUX” position.
2. Insert the Normal blank tape (QZZCRA) into DECK 2 and
the unit to “REC” mode (use “
l
REC/STOP” key).
3. Measure and make sure that the output is within the
standard value.
Bias voltage for Deck 2
14±4mV (Normal)
Fig. 2
Fig. 3
13 Adjustment Procedures
13.1.3. Bias Frequency Adjustment (Deck 1/2)
1. Set the unit to “AUX” position.
2. Insert the Normal blank tape (QZZCRA) into DECK 2 and set the unit to “REC” mode (
l
use “REC/STOP” key).
3. Adjust L1002 so that the output frequency is within the standard value as below.
Standard Value: 89 ~ 110 kHz
Fig. 4
13.1.3.1. Cassette Deck Section
Below is the locations of test points for Deck P.C.B.:-
44
SA-AK640PL
Summary of Contents for SA-AK640PL
Page 12: ...7 Accessories Remote Control FM Antenna Wire AC Cord AM Loop Antenna 12 SA AK640PL ...
Page 13: ...8 Operating Instructions Procedures 13 SA AK640PL ...
Page 14: ...14 SA AK640PL ...
Page 23: ...10 3 Main Parts Location 23 SA AK640PL ...
Page 39: ...39 SA AK640PL ...
Page 41: ...12 2 Checking and Repairing of Transformer P C B 41 SA AK640PL ...
Page 42: ...12 3 Checking and Repairing of Panel Deck Deck Mechanism P C B 42 SA AK640PL ...
Page 43: ...12 4 Checking and Repairing of Power P C B 43 SA AK640PL ...
Page 48: ...48 SA AK640PL ...
Page 49: ...14 2 Power P C B Transformer P C B 49 SA AK640PL ...
Page 50: ...14 3 Waveform Chart 50 SA AK640PL ...
Page 51: ...51 SA AK640PL ...
Page 58: ...58 SA AK640PL ...
Page 60: ...SA AK640PL 60 ...
Page 62: ...SA AK640PL 62 ...
Page 68: ...SA AK640PL 68 ...
Page 70: ...SA AK640PL 70 ...
Page 76: ...SA AK640PL 76 ...
Page 84: ...SA AK640PL 84 ...
Page 89: ...21 Exploded Views 21 1 Cabinet Parts Location SA AK640PL 89 ...
Page 90: ...SA AK640PL 90 ...
Page 91: ...21 2 Deck Mechanism Parts Location RAA4502 S SA AK640PL 91 ...
Page 92: ...21 3 Packaging SA AK640PL 92 ...