There are currently no product reviews.
The schematic is very helpful and the images are very good.The schematic is very helpful and the images are very good.The schematic is very helpful and the images are very good.The schematic is very helpful and the images are very good.The schematic is very helpful and the images are very good.The schematic is very helpful and the images are very good.
Welcome. The scheme is clearly helped me to repair. Worth to download it.
Excellent manual, very clear, technical specification provided, useful information regarding adjustment and set up.
fast and easy and exactly what I was looking for. Not the cheapest but value for money after all.
The manual for the Sansui P-L75 was not one of the more informative turntable manuals around but for $5 it was helpful enough.
Focus/Tracking Gain Adjustment A servo analayzer is necessary in order to perform this adjustment exactly. However, this gain has a margin, so even if it is slightly off, there is no problem. Therefore, do not perform this adjustment. Focus/tracking gain determines the optical pick-up follow-up relative to mechanical noise and mechanical shock when the 2-axis device operates. However, as these reciprocate, the adjustment is at the point where both are satisfied. â¢ When gain is rased, the noise when 2-axis device operates increase. â¢ When gain is lowered, it is more susceptible to mechanical shock and skipping occurs more easily. This adjustment has to be performed upon replacing any of the following parts. â¢ Optical pick-up â¢ RV503 (Focus gain VR) â¢ RV502 (Tracking gain VR) Normally, be sure not to move RV503 (focus gain VR) and RV502 (tracking gain VR). Adjustment procedure: â Focus Gain Adjustment â This adjustment is not performed. If focus gain VR RV503 is turned, set to mechanical center. Adjustment Location: MAIN Board (SUFFIX-11: See page 12, SUFFIX-12: See page 13)
The waveforms are those measured with the oscilloscope set as shown below. â¢ VOLT/DIV: 500 mV â¢ TIME/DIV: 5 ms â¢ Waveform when tracking gain is lowered. Fundamental wave appears. (large waves)
âââ 0 V
Adjustment and Checking Location: â MAIN BOARD (Side A) â (SUFFIX-11) â MAIN BOARD (Side A) â (SUFFIX-12)
â¢ Waveform when fundamental wave disappears. (no large waves)
âââ 0 V
â¢ Waveform with no traverse waveform during 100 track jump. (Brake application is smooth because of adjustment)
âââ 0 V TP522 (RFO)
TP522 (RFO) TP401 (VCC)
â Tracking Gain Adjustment â (perform at normal operation)
oscilloscope (DC range) MAIN board TP (TE) TP520 (VC) SUFFIX-11: See page 12 SUFFIX-12: See page 13 10 k â¦
100 track jump waveform
â¢ Waveform with traverse waveform during 100 track jump. (Brake application is poor because of adjustment)
RV401 (VCC) RV401 (VCC)
âââ 0 V
1. Place the optical pick-up level, horizontally. (If the optical pick-up is not level, the 2-axis device will be weighted and adjustment cannot be done) 2. Connect the oscilloscope to TP (TE) and TP520 (VC) on the MAIN board. 3. Set the disc (YEDS-18) and press the ^ key. 4. Turn RV502 slightly clockwise (tracking gain drops) and obtain a waveform with a fundamental wave (waveform has large waves) as in Figure 1. Turn RV502 slowly counterclockwise (tracking gain rises) until the fundamental wave disappears (no large waves) as in Figure 2. Set RV502 to the position about 30Ë counterclockwise form the position obtained in step 5. If RV502 contact point is more than 90Ë counterclockwise from mechanical center, tracking gain is too high. In this case, readjust from step 4. Press + or = key and observe the 100 track jump waveform. Check that no traverse waveform appears for both + or = directions. (See Figures 3 and 4) It is acceptable if the traverse waveform appears only now and then, but if it appears constantly, raise tracking gain slightly and check step 7 again. Check that there is not abnormal amount of operation noise (white noise) from the 2-axis device. If there is, tracking gain is too high, readjust starting with step 4.
100 track jump traverse waveform waveform
RV503 Focus Gain Adjustment TP520 (VC) TP (TE)
Adjustment Location: MAIN Board (SUFFIX-11: See page 12, SUFFIX-12: See page 13)
RV503 Focus Gain Adjustment RV502 Tracking Gain Adjustment TP520 (VC) TP (TE) RV502 Tracking Gain Adjustment
â 11 â
â 12 â
â 13 â
Complete owner's manual in digital format. The manual will be available for download as PDF file aft…