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Service Manual

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

Description of SONY DF400 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 10 (click to view)
Focus/Tracking Gain Adjustment A servo analyzer 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 pick-up follow-up relative to mechanical noise and mechanical shock when the 2-axis device operate. However, as these reciprocate, the adjustment is at the point where both are satisfied. • When gain is raised, the noise when 2-axis device operates increases. • 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) • RV502 (Tracking gain) Normally, be sure not to move RV503 (focus gain) and RV502 (tracking gain). – Focus Gain Adjustment – Procedure : This adjustment is not performed. If focus gain RV503 is turned, set to mechanical center. – Tracking Gain Adjustment – (perform at normal operation) [MAIN BOARD] (Side B)

1. Place the optical pick-up level, horizontally. (If the optical pickup is not level, the 2-axis device will be weighted and adjustment cannot be done.) 2. Connect the oscilloscope between IC501 0 pin (TEO) and #º pin (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 Fig. 1 . 5. Turn RV502 slowly counterclockwise (tracking gain rises) until the fundamental wave disappears (no large waves) as in Fig. 2. 6. Set RV502 to the position about 30°counterclockwise from the position obtained in step 5. If RV502 contact point is more than 90° counterclockwise from mechanical center, tracking gain is too high. In this case, readjust from step 4. 7. Press ^ (+) or = keys and observe the 100 track jump waveform. Check that no traverse waveform appears for both ^ (+) or = directions. (See Fig. 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. 8. Check that there is no 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. The waveforms are those measured with the oscilloscope set as shown below. • VOLT/DIV : 50mV • TIME/DIV : 5mS • Waveform when tracking gain lowered. Fundamental wave appears (Large amplitude appears.)

oscilloscope (DC range) IC501 !º pin (TEO)
+ –

Fig. 1 • Waveform when fundamental wave disappears (Large amplitude does not appear.)

IC501 #º pin (VC)

Fig. 2 • Waveform when no traverse waveform during 100 track jump. (Brake application is smooth because of adjustment.)
30 10

100 track jump waveform

Fig. 3

• Waveform when no traverse waveform during 100 track jump. (Brake application is poor because of adjustment.)


100 track jump waveform traverse waveform

Fig. 4

— 10 —

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