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MITSUBISHI DD8020
Service Manual


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

Description of MITSUBISHI DD8020 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 19 (click to view)
7
Does pulse of L = 1.65V and H = 3.3V develop at pin 131 and L = 0V and H = 1.65V develop at pin 132 of IC401? Y Y Check signal process system following to IC402. Does RF output higher than 1 V(p-p) develop at pin 30 (TP502) of IC502? Y N

Disc playback is NG (DVD).

N

Is PLL locked? (Refer to waveforms.)

N

Check peripheral circuits of IC401 and IC306.

Check IC502. Lens cleaning.

N

Pin 43 of IC502 = 2.4V Pin 44 of IC502 = 3.0V

Pickup mechanism replacement

Y Check peripheral circuits of IC401 and IC306. Check peripheral circuits of IC502 and IC401.

Fig. 1-3-16

PLL works as a servo loop to generate a clock signal for reading RF signal binary data. With the PLL locked, the eye pattern is identified clearly when triggered with the read clock PLCK.
DVD RF signal
DVD playback waveform

DVD RF signal Pin 30 (TP502) of IC502
DVD RF signal Pin 30 (TP502) of IC502

V : 500 mV/div H : 50 ns/div

DVD PLCK Pin 117 (TP409) of IC401

Fig. 1-3-17

CH1 : TP502 DVDRF 500 mV/div CH2 : TP409 DVDPLCK 5 V/div 50 ns/div

Fig. 1-3-19
CD RF signal

CD playback waveform

CD RF signal Pin 30 (TP502) of IC502

CD RF signal Pin 30 (TP502) of IC502

V : 500 mV/div H : 100 ns/div

CD PLCK Pin 117 (TP409) of IC401 CH1 : TP502 CDRF 500 mV/div CH2 : TP409 CDPLCK 5 V/div 100 ns/div

Fig. 1-3-18

Fig. 1-3-20

1-13

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