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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 !
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.
This is an excellent information source. Great quality and tons of info regarding technical service for the Technics SH8065.
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.
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!!!!
Level drop at the guide roller (supply side) C D
(3) Press the channel buttons (+, â) simultaneously to enter the manual tracking mode. This also brings tracking to the center (centre). (4) Adjust the AUDIO OUT waveform and Control pulse waveform by turning the screws (1), (2) and (3) little by little until both waveforms reach maximum. The screw (1) and (3) are for adjustment of tilt and the screw (2) for azimuth.
Level drop at the guide roller (take-up side)
Audio control head (3)
â¢ Proper waveform variation: Always flat
AUDIO OUT â¢ Improper waveform variation: Higher Lower CTL. P
Fig. 2-3-2a 2.3.3 Checking/Adjustment of the Audio Control Head Phase (X-Value)
Signal Mode (A1) (B) (C) (D) (E) (F) (G) (H)
(a) Guide roller
Equipment Measuring point External trigger Adjustment part
â¢ Alignment tape(SP, stairstep, NTSC) [MHP] â¢ PB â¢ Oscilloscope â¢ TP106 (PB. FM) â¢ TP111 (D.FF) â¢ A/C head base [Mechanism assembly] â¢ Maximum V.PB FM waveform â¢ A/C head positioning tool [PTU94010]
(b) Guide pole
Specified value Adjustment tool
Fig. 2-3-1d 2.3.2 Checking/Adjustment of the Height and Tilt of the Audio Control Head Note: â¢ Set a temporary level of the height of the A/C head in advance to make the adjustment easier after the A/C head has been replaced. (See Fig.2-2-6c.)
Signal Mode Equipment Measuring point External trigger Adjustment part Specified value (A) (B) (C) (D1) (D2) (E) (F) (G)
(1) Play back the alignment tape (A1). (2) Apply the external trigger signal to D.FF (E), to observe the V.PB FM waveform at the measuring point (D). (3) Press the channel buttons (+, â) simultaneously to enter the manual tracking mode. This also brings tracking to the center (centre). (4) Loosen the screws (4) and (5), then set the A/C head positioning tool to the innermost projected part of the A/ C head. (See Fig. 2-3-3a.) (5) Turn the A/C head positioning tool fully toward the capstan. Then turn it back gradually toward the drum and stop on the second peak point position of the V.PB FM waveform output level. Then tighten the screws (4) and (5). (6) Perform the tracking operation and make sure that the V.PB FM waveform is at its maximum. If it is not at maximum, loosen the screws (4) and (5), and turn the A/C head positioning tool to bring the A/C head to a position, around where the waveform reaches its maximum for the first time. Then tighten the screws (4) and (5).
â¢ Alignment tape(SP, stairstep, NTSC) [MHP] â¢ PB â¢ Oscilloscope â¢ AUDIO OUT terminal â¢ TP4001 (CTL. P) â¢ TP111 (D.FF) â¢ A/C head [Mechanism assembly] â¢ Maximum waveform
(1) Play back the alignment tape (A). (2) Apply the external trigger signal to D.FF (E), to observe the AUDIO OUT waveform and Control pulse waveform at the measuring points (D1) and (D2) in the ALT mode.