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SONY HCD-VX777
Service Manual


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  • Contains Circuit Diagrams
  • Download
  • PDF Format
  • Complete manual
  • Language: English
Price: $4.99

Description of SONY HCD-VX777 Service Manual

Complete service manual in digital format (PDF File). Service manuals usually contains circuit diagrams, printed circuit boards, repair tips, wiring diagrams, block diagrams and parts list. Service Manual ( sometimes called Repair Manual ) is used mainly by technicians.

If You just want to know how to use Your tv, video, mp3 player etc. You should look for Owner's Manual. After placing order we'll send You download instructions on Your email address.

The manual is available in languages: English

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Text excerpt from page 15 (click to view)
HCD-VX777

2. Turn the adjustment screw and check output peaks. If the peaks do not match for L-CH and R-CH, turn the adjustment screw so that outputs match within 1dB of peak.

Tape Speed Adjustment

DECK B

Note: Start the Tape Speed adjustment as below after setting to the test mode. In the test mode, the tape speed is high during pressing the CD SYNC HI-DUB button.

L-CH peak Output level

within 1dB within 1dB

Procedure: 1. Turn the power switch on. 2. Press the x button, ENTER button and DISC 3 button simultaneously. (The �TEST MODE� on the fluorescent indicator tube display while in the test mode.) To exit from the test mode, press the ?/1 button. Mode: Playback

Screw position

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

Screw position

test tape WS-48B (3 kHz, 0 dB) set main board CN301 (Pin 3 (Pin 1

frequency counter

3. Mode: Playback
test tape P-4-A100 (10 kHz, �10 dB) L-CH MAIN board CN301 set R-CH pin 1 waveform of oscilloscope pin 3 L R pin 2 V H

+ � : L-CH) : R-CH)

oscilloscope

1. Insert the WS-48B into the deck B. 2. Press the gG button on the deck B. 3. Press the CD SYNC HI-DUB button in playback mode. Then at HIGH speed mode. 4. Adjust RV1001 on the LEAF SW board do that frequency counter reads 6,000 ± 30 Hz. 5. Press the CD SYNC HI-DUB button. Then back to NORMAL speed mode. 6. Adjust RV1002 on the LEAF SW board so that frequency counter reads 3,000 ± 15 Hz. Adjustment Location: LEAF SW board Playback level Adjustment DECK A Procedure: Mode: Playback
test tape P-4-L300J (315 Hz, 0 dB) set

in phase 45 ° good

90 ° 135 ° 180 ° wrong

DECK B

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

level meter

+ �

main board CN301 (Pin 3 : L-CH)

Deck A is RV302 (L-CH), Deck B is RV303 (L-CH) so that adjustment within adjustment level as follows. Adjustment Level: CN301 PB level: 334.4 to 748.7 mV (�7.3 to �0.3 dB) level difference between the channels: within ±0.5 dB Adjustment Location: MAIN board Sample Volue of Wow and Flutter: 0.3% or less W. RMS (WS-48B)

forward reverse

15

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