SONY HCDGRX90AV
Instrukcja Serwisowa

3. Mode: Playback
test tape P-4-A100 (10kHz, �10dB) oscilloscope MD OUT

Tape Speed Adjustment (Deck A) Note: Set the test mode using the following method and begin tape speed adjustment. In the test mode, the speed will switch to double speed or normal speed each time the HI-DUB button is pressed. Procedure: With the power turned ON, press the p button, ENTER/NEXT button, and DISC 3 button simultaneously. (The �CD TABLE INDICATOR� on the fluorescent display tube will blink while in the test mode.) To exit the test mode, press the 1/u button.
Waveform of oscilloscope

set

1. Insert the WS-48B into deck B. 2. Press the ( button of deck B. 3. Press the HI-DUB button and play the tape at double speed. 4. Adjust RV1001 of the LEAF SW board so that the reading of the frequency counter becomes 6000 ± 180 Hz. 5. Press the HI-DUB button and play the tape at normal speed. 6. Adjust RV1002 of the LEAF SW board so that the reading of the frequency counter becomes 3000 ± 90 Hz. Adjustment Location: LEAF SW board

in phase

45° good

90°

135°

180° wrong

4. After the adjustments, apply suitable locking compound to the parts adjusted. Adjustment Location: Playback Head (Deck A) Record/Playback/Erase Head (Deck B)

Sample Value of Wow and flutter W.RMS (JIS) less than 0.3% (test tape: WS-48B) Playback Level Adjustment (Deck A, Deck B) Procedure: Mode: Playback
test tape P-4-L300 (315Hz, 0dB) set level meter

Reverse

Foward

MD OUT

Deck A is RV311 (L-CH) and RV411 (R-CH), deck B is RV301 (L-CH) and RV401 (R-CH) so that adjustment within the following adjustment level. Adjustment level: CN301 playback level: 301.5 to 338.3 mV (�8.2 to �7.2 dB) level difference between the channels: within ± 0.5 dB Adjustment Location: AUDIO board

Adjustment Location [LEAF SW BOARD]
RV1001(High Speed) RV1002(Normal Speed)

RV1002

RV1001

� 15 �