SONY TCWE675
Manual de Servicio

TC-WE675

Record/Playback Head Azimuth Adjustment DECK A Procedure: 1. Forward Playback Mode
test tape P-4-A100 (10 kHz, �10 dB) 47 k� set level meter

DECK B

Tape speed Adjustment Adjust DECK A first Procedure: � Forward Playback Mode �
test tape WS-48B (3 kHz, 0 dB)

DECK A

DECK B

frequency counter 47 k� set

LINE OUT

LINE OUT

2. Turn the adjustment screw for the maximum output levels. If these levels do not match, turn the adjustment screw until both of output levels match together within 1 dB.

L-CH peak

output within 1 dB level

within 1 dB

screw position

R-CH peak L-CH peak R-CH peak

screw position

3. Playback Mode
test tape P-4-A100 (10 kHz, �10 dB) L-CH 47 k�

(High speed adjustment) 1. Press the PITCH CONTROL button to set to OFF . 2. Set to test mode. (Refer to page 11.) 3. Press the H button to playback. 4. Press the HIGH/NORMAL button to playback at double speed. 5. Adjust RV316 (DECK A), RV416 (DECK B) so that the frequency counter reading becomes 5,980 ± 80 Hz. (Normal speed adjustment) 6. Press the H button to playback. 7. Press the HIGH/NORMAL button to playback at normal speed. 8. Adjust RV317 (DECK A), RV417 (DECK B) so that the frequency counter reading becomes 3,000 ± 90 Hz. (Pitch control adjustment) (DECK A) 9. Press the PITCH CONTROL button to set to ON . 10. Set PITCH CONTROL knob to mechanical center. 11. Press the H button to playback. 12. Adjust RV318 so that the frequency counter reading becomes 2,990 ± 90 Hz. Adjustment Location: MAIN board (See page 14.)

oscilloscope

set

V

H

Sample value of wow and flutter W.RMS (JIS) less than 0.3% . (test tape : WS-48B) Playback Level Adjustment Procedure: � Forward Playback Mode �
test tape P-4-L300 (315 Hz, 0 dB) 47 k�

DECK A

DECK B

R-CH

47 k� LINE OUT Screen Pattern

level meter

In phase

45� good

90�

135�

180�

set

wrong

LINE OUT

4. Change the reverse playback mode and repeat the steps 1 to 3. 5. After the adjustment, lock the adjustment screws with suitable locking compound. Adjustment Location: � record/playback head �

Adjust DECK A : RV111 (L-CH), RV211 (R-CH) and DECK B : RV121 (L-CH), RV221 (R-CH) so the level meter reading becomes the adjustment limits below. Adjustment Value: LINE OUT level : �7.7 dBs ± 0.5 dB (0.301 to 0.338 V) Level difference between channels : within 0.5 dB Confirm that the LINE OUT level does not change in playback mode while changing the mode from playback to stop several times.

reverse side

forward side

Adjustment Location: MAIN board (See page 14.)

adjustment screws

9