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SONY DE885
Service Manual


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

Description of SONY DE885 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 11 (click to view)
D-E808/E885

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. ⢠When gain is rased, the noise when 2-axis device operates increase. ⢠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. ⢠Optical pick-up ⢠RV503 (Focus gain VR) ⢠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. ⢠VOLT/DIV: 500 mV ⢠TIME/DIV: 5 ms ⢠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)

Fig. 1
⢠Waveform when fundamental wave disappears. (no large waves)
âââ 0 V

Fig. 2
⢠Waveform with no traverse waveform during 100 track jump. (Brake application is smooth because of adjustment)

âââ 0 V TP522 (RFO)

TP401 (VCC)

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¦
+ â

100 track jump waveform

Fig. 3
⢠Waveform with traverse waveform during 100 track jump. (Brake application is poor because of adjustment)
RV401 (VCC) RV401 (VCC)

0.0022 µF
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)

Fig. 4
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

5.

6.

7.

8.

â 11 â

â 12 â

â 13 â

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