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Thanks for this "hard to find" service manual. This Sony PS212A is a very good turntable that needed to be restored !
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Excellent quality on these manuals. Same as having the original printed manual and incredibly useful when doing a custom install like me. Keep it up on the good work.
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This is an excellent information source. Great quality and tons of info regarding technical service for the Technics SH8065.
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5 stars on this manual since it is the complete version, not the half manual you find free for download all over the web. Good job.
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Thank you very much you are helping me a lot with my preferred hobby!!! this manual of an old TV is going to be very helpful!!!!
You are very honest competent great job very clear and well done!!!!
Matteo
TAPE DECK ADJUSTMENTS
1. HEAD REPLACEMENT
� After replacement, demagnetize the heads by using a degausser. � Be sure to clean the heads before attempting to make any adjustments. � All wiring should be returned to the original position after work is completed.
2. HEAD AZIMUTH ADJUSTMENT
(1) Load the test tape(VTT-703, etc., 10 kHz) for azimuth adjustment. (2) Press the PLAY button. (3) Use a cross-tip screwdriver to turn the screw for azimuth adjustment so that the left and right output are maximized. (4) Press the STOP button. (5) After completion of the adjustment, use thread lock(TB-1401B) to secure the azimuth-adjustment screw.
3. AC BIAS FREQUENCY ADJUSTMENT
(1) Connect counter to T201(BS). (2) R/P switch in recording state. (3) Adjustment T801 a plastic screw , AC bias frequency : 80 kHz.
4. MOTOR SPEED ADJUSTMENT
(1) Insert the test tape(TCC-119, etc., 3,000 Hz). (2) Press the PLAY button. (3) Use a flat-tip screwdriver to turn the SVR(located inside the rear of the motor) to adjust SVR so that the frequency counter become 3,000 Hz.
5. CHECKING THE MECHANISM TORQUES AND TENSION
� Clean the head, capstan and pinch roller before making any measurement.
Measurement Cassette for measurement PLAY F.FWD REW Take-up torque PLAY : TW-211A F.FW/REW : TW-2231 30 - 60 gr.cm 55 - 120 gr.cm. 55 - 120 gr.cm. Back tension PLAY : TW-2111A 2.0 - 4.5 gr.cm --------Tape tension Drive-power cassete TW-2412 60 gr or more. ---------
This is a basic adjustment.
IC BLOCK DIAGRAM & DESCRIPTION
IC903 LA6541D(CD Driver)
Vcc 24 Vref 23 11k VIN4 22 VG4 21 Vo8 20 Vo7 19 Vcc GND Vo6 18 Vo5 17 VG3 16 11k VIN3 15 CD 14 RES 13
Level Sift
BTL Driver
BTL Driver
Level Sift
RESET
Level Sift
BTL Driver
BTL Driver
Level Sift
Regulator
11k 1 Vcc 2 Mute 3 VIN1 4 VG1 5 Vo1 6 Vo2 GND 7 Vo3 8 Vo4 9
11k 10 11 12
VG2
VIN2 Reg OUT Reg IN
-3-
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