Panasonic SA-PM25 - Measurement, Alignment, and Adjustment; Cassette Deck Adjustments

Error Code Problem Condition Possible Cause
H01 Cassette deck
maifunctions
MODE SW detection error.
Faulty contact or short circuit of mechanism mode switch. (
S971)
H02 Recording not possible
REC INH SW detection error.
Faulty contact or short circuit of REC INH switch. (S974,
S975)
H03 Playback cannot
perform.
HALF SW detection error.
Faulty contact or short circuit of HALF switch. (S972)
F01 The tape advances
slightly and then stops.
Reel pulse detection error.
Faulty reel pulse, faulty hole detect IC. (IC971)
F02 Cassette deck will not
perform TPS function
Faulty TPS drive IC. (IC303)
9. Measurement and Adjustment
9.1. Cassette Deck Section
Measurement condition
- Record timer : OFF
- Make sure head, capstan and pressure roller are clean.
- Judgeable room temperature 20 ± 5 °C (68 ± 9 °F)
Measuring instrument
- EVM (Electronic Voltmeter)
- Digital frequency counter
Test tape
- Headazimuth adjustment (8 kHz, -20 dB); QZZCFM
- Tape speed adjustment (3 kHz, -10 dB); QZZCWAT
- Playback gain adjustment (315 Hz, 0 dB); QZZCFM
- Normal reference blank tape; QZZCRA
- CrO2 blank tape; QZZCRX
9.1.1. Head Azimuth Adjustment
Note :
If you wish to readjust the head azimuth, be sure to adjust with adhering the casette tape closely
to the mechanism by pushing the center of cassette tape with your finger. (Shown in Fig. 1)
1. Connect the measuring instrument as shown in Fig. 2.
2. Playback the azimuth adjustment portion(8kHz, -20dB) of test
tape(QZZCFM). Adjust the azimuth adjusting screw until the
outputs of the L/Rch are maximized. (Refer to Fig. 3)
Make sure that the difference in the peak level between the left and
right channels does not exceed 5dB.
3. Perform the same adjustment in reverse playback mode.
Check of the level difference forward and reverse directions
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