Tape Speed Adjustment (Deck 1/2) - Panasonic SA-AK18 Service Manual

- Please replace both azimuth adjustment screw (RHE5152ZB) and springs (RM0331) simultaneously when readjusting the
head azimuth. (shown in Fig. 2) Even if you wish to readjust the head azimuth without replacing the acrews and springs,
a fineadjustment to the azimuth screw and spring.
- Please remove the screw-locking bond left on the head base when replacing the azimuth screw.
- If you wish to readjust the head azimuth, be sure to adjust with adhering the cassette tape closely to the mechanism by
pushing the center of cassette tape with your finger. (shown in Fig. 3)
1. Playback the azimuth adjustment portion (8 kHz, -20dB) of the test tape (QZZCFM) in the forward play mode. Vary the
azimuth adjustment screw until the output of the R-CH (PB OUT-R) are maximized.
2. Perform the same adjustment in the reverse play mode.
3. After the adjustment, apply screwlock to the azimuth adjusting screw.

12.1.2. Tape Speed Adjustment (Deck 1/2)

1. Set the tape edit button to "NORMAL" position.
2. Insert the test tape (QZZCWAT) to DECK 2 and playback (FWD side) the middle portion of it.
3. Adjust Motor VR (DECK 2) for the output value shown below.
Adjustment target: 2940 ~ 3060 Hz
(NORMAL speed)
4. After alignment, assure that the output frequency of the DECK 2 REV and DECK 1 FWD are within ±45Hz and ±60 Hz
respectively of the value of the output frequency of DECK 2 FWD.
12.1.3. Bias and Erase Voltage Check
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