DV-NC55S/H
DV-NC60H
NoYesYesNo
Replace IC301.
Check AT 8V line.Replace IC7701.
Replace the remote control receiver or replace the remote control transmitter is necessary.Check AT 5V line.Replace the remote control receiver.Check the line between the remote control receiver and the pin(10) of IC8201.Replace IC8201.Check the line between the remote control receiver and the pin(32) of IC504.Replace IC504.Check the LD-RVS/FWD signal line between IC7701 and the IC504.Is 8V voltage applied to the pin(8) of IC7701?Check the line between the IC7701 and the loading motor.See FLOW CHART NO.6<The [No Disc] indication. (In case focus servo does not function.)>Is there input signal on the pins(52), (53), (54) and (55) of IC301?Check the connection of optical pickup cable. If it is normal, replace the optical pickup.
YesYes
NoNoNoNoNoNoNoNoNoNoNo
YesYesYesYesYesYesYesYesYes
FLOW CHART NO.3No operation is possible from the infrared remote control.Operation is possible from the DVD, but no operation is possible from the infrared remote control.Is 5V voltage supplied to the pin(3) terminal of remote control receiver?Is the "L" pulse sent out pin(1) terminal of receiver when the infrared remote control is activated?Is pulse signal supplied to the pin(10) of IC8201?Is pulse signal supplied to the pin(32) of IC504?FLOW CHART NO.4The disc tray cannot be opened and closed.Is the signal from the pins(70) and (69) of IC504 input into the pins(1) and (28) of IC7701?Is loading motor drive voltage output from the pins(9) and (10) of IC7701?Is the loading motor drive voltage applied to the terminal of loading motor?Check for mechanism and gear engagement and breakage.FLOW CHART NO.5The [No Disc] indication. (In case of focus error)Does the optical pickup move up and down after the disc is removed?(Checking of symptom.)Is FE signal output to the pin(21) of IC301 when the disc is set?Is FE signal inputted into the pin(150) of IC701?Check or replace IC701.Check the line between the IC301 and IC701.
S5002 PLAYKEY�2
OFF
S5003 STOPKEY�1
Check the PC 5V line.Check the PC -22V line and Q8202.Check R5014-5, IC5001 and their periphery.Check or replace IC5001 and IC504.Check the power circuit, D5004 and Q8203.Check that the fluorescent display tube is free from damages such as crack.
NoNoNoNoNoNoNo
0V
3.3V2.5V1.8V0.9V
KEY-1/2
YesYesYesYesYesYes
Is the supply voltage of 5V fed to pin(14) and pin (38) of IC5001?Is the control voltage normally into the pins(95) and (96) of IC504?
11. TROUBLESHOOTING(DVD)FLOW CHART NO.1The fluorescent display tube does not light.Is the supply voltage of -19V fed to pin(27) of IC5001?Is there 500kHz oscillation at pin(44) of IC5001?Check the signal lines of FIP DA, FIP CK, FIP CS of IC5001 and IC504.Are the filament voltage applied between (1), (2) and (31), (32) of the fluorescent display tube? Also negative voltage applied between these pins and GND.Check the fluorescent display tube and its periphery?FLOW CHART NO.2The key operation is disabled.Is key switch contact and installation state normal?Replace key switch.
44 |
ACEC
SHARP
