Measurement And Adjustments; Cassette Deck Section - Panasonic SA-PM21PC Service Manual

14 Measurement And Adjustments

14.1. Cassette Deck Section

14.1.1. Requirements
· Test tape (QZZCFM) (QZZCWAT)
· Normal blank cassette tape (QZZCRA)
· Digital frequency counter
· Oscilloscope
· Electrical voltmeter
· Headphone jack output jig (Fig. 8)
14.1.2. Setting of Unit
· VOLUME: MAX
14.1.3. Preparations
1. Apply under [10. Assembling and Disassembling].
2. Remove 4 screws from the mechanism unit to disassemble. under [10. Assembling and Disassembling].
3. Connect the headphone jack output jig (Fig. 8) to headphone jack.
14.1.4. Tape Speed Adjustment
· Normal speed adjustment (only during forward playback)
(Product reference value: 3,000±90Hz)
1. Connect a frequency indicator. (Fig. 12)
2. Playback the middle portion of the test tape (QZZCWAT).
3. Adjust the motor screw so that the following output level is produced. (Fig. 10)
Adjustment Range: 3,000 ± 90Hz (a constant speed)
Fig. 8
Fig. 9
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SA-PM21PC