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 ;
this manual make me repair my vintage radio with easily.
Thank you for your best service
sukpra
;
A good manual. Had everything i needed to make the repair.
;
This manual is a complete guide, including later additions. It has all the necessary information about the replacement items. The material quality is great to read.
 ;
This manual is very helpful, correct shematic diagram, and good exploded view.Perfect!
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Alte gescannte Servicepläne sind oft doch etwas undeutlich . Stromlaufpläne werden auf mehrere DIN A4 Seiten aufgeteilt. Alles ziemlich umständlich und zeitaufwendig. Aber mit etwas Mühe geht alles.
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 Mode: Playback
test tape WS-48B (3 kHz, 0 dB) set
DECK B
frequency counter + � main board MD OUT jack (J101) L-CH, R-CH
L-CH peak Output level
within 1dB within 1dB
Screw position
R-CH peak L-CH peak R-CH peak
Screw position
1. Insert the WS-48B into the deck B. 2. Press the ( button on the deck B. 3. Press the [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 ± 180 Hz. 5. Press the [HI-DUB] button. Then back to NORMAL speed mode. 6. Adjust RV1002 on the LEAF SW board so that frequency counter reads 3,000 ± 90 Hz. Adjustment Location: LEAF SW board Sample value of Wow and Flutter: 0.3% or less W.RMS (JIS) (WS-48B) Playback level Adjustment
3. Mode: Playback
test tape P-4-A100 (10 kHz, �10 dB) L-CH MAIN board CN301 set R-CH R-CH waveform of oscilloscope main board MD OUT jack (J101) L-CH oscilloscope
V
H
DECK A
DECK B
Procedure: Mode: Playback
test tape P-4-L300 (315 Hz, 0 dB) set main board MD OUT jack (J101) L-CH, R-CH
in phase 45° good
90° 135° 180° wrong
level meter + �
4. Repeat step 1 to 3 in playback (REV) mode. 5. After the adjustments, apply suitable locking compound to the pats adjusted. Adjustment Location: Playback Head (Deck A). Record/Playback/Erase Head (Deck B).
Deck A is RV311 (L-CH) and RV411 (R-CH), Deck B is RV301 (L-CH) and RV401 (R-CH) so that adjustment within adjustment level as follows. Adjustment Level: J101 PB 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
forward reverse
� 15 �
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