DV-L70U
NOYES
Check the line from the pin 52 of IC707, through Q304, to the base of Q301. Check the line between the pin 45 of IC303 and base of Q307. Check the line between S502 and R397.Check the D_3.1V line and A_4.8V line.Check the Q301 and line between Q307 and CN301.Check the line between the pin 4 of IC303 and base of Q308. Check the line between S502 and R397.Check the A_4.8V line.Check the line between Q308 and CN301.Check the loading switch (S502).Replace the optical pickup unit.Check for contamination of objective lens of optical pickup.It is laundered by the disk cleaner.
NONONONONONONONONONO
YESYESYESYESYESYESYESYESYESYES
The DVD disc is not recognized.The CD disc is not recognized.
(When the laser beam does not go on)(When the laser beam does not go on)
Both picture and sound do not operate normally.
FLOW CHART NO.10Is the drive signal (SEL) of Q301 (LD POWER ON) being output to the pin 52 of IC707? Is the drive signal (LDO1) of Q307 (LD POWER CTL) being output to the pin 45 of IC303? When S502 is pressed, is the base of Q309 0.8V?Is the voltage of 3.1V being applied to the emitter of Q301? And, is the voltage of 3.4V being applied to the emitter of Q307?Is the voltage of 3.1V and 2.3V being applied to the pins 14 and 23 of CN301, respectively?Check the connection of optical pickup cable. If it is normal, replace the pickup.FLOW CHART NO.11Is the drive signal (LDO2) of Q308 (LD POWER CTL) being output to the pin 4 of IC303? When S502 is pressed, is the base of Q309 0.8V?Is the voltage of 3.4V being applied to the emitter of Q308?Is the voltage of 2.3V being applied to the pin 9 of CN301?Check the connection of optical pickup cable. If it is normal, replace the pickupFLOW CHART NO.12Set the disc on the disc tray.Is it possible to hold normally the disc with the check?Is the level of RF signal which is output from the pin 28 of IC303, normal?Does a signal come out in the following, each output terminal of the integrated circuit? Picture signal IC201 20pin Y-SIG. IC201 22pin C-SIG. Sound signal IC801 16pin AUDIO(L-CH)-SIG. IC801 13pin AUDIO(R-CH)-SIG.Replace the main pwb unit.
YESNONONONO
YES
Refer to "The disc is not recognized. (When the focus servo does not function)".In case of DVD:Is the input signal supplied to the pins (58, 63), (59, 64), (60, 3), and (61, 2)of IC303? In case of CD: Is the input signal supplied to the pins (49, 55), (50, 54), 46, and 47 of IC303?Check the connection of optical pickup cable. If it is normal, replace the optical pickup cable.Check the line between pin 21 of IC303 and pin 38 of IC707.Check the power supply peripheral circuit. If it is normal, replace the IC707.Check the line between IC707 and IC702.Is the focus control voltage being input to the pin 17 of IC702?Is the voltage of 4.8V being applied to the pins 5 and 20 of IC702?Check the AT 8V line.Replace the IC702.Check the line between IC702 and connector CN301.
YES
NONONONONONO
YESYESYESYESYES
(In case of focus error)
The disc is not recognized.The disc is not recognized.
(When the focus servo does not function)
FLOW CHART NO.8When the playback button is pressed while both tray switch(S1001) and LD switch(S502) are held down with a disc loaded, the disc rotates but stops immediately.Is the FE signal output to the pin 21 of IC303?FLOW CHART NO.9Is the FE signal being input to the pin 38 of IC707? (Check item for the symptom)Is the focus control signal being output to the pin 43 of IC707?Is the focus control voltage being output from the pins 24 and 25 of IC702?Is the focus control drive voltage being applied to the pins 4 and 2 of CN301?Check the connection of optical pickup cable. If it is normal, replace the pickup.
8-2 |
ACEC
SHARP
