DV-NC65H/S
DV-NC70H
YesYesNo
Replace IC3704.Replace IC3301.
Replace the remote control receiver or replace the remote control transmitter if necessary.Check AT 5V line.Replace the remote control receiver.Check the line between the remote control receiver and the pin(42) of IC3501.Replace IC3501.Check pin(61) of IC3701. Check LOAD signal line between IC3701 and IC3704.Check IC3704.Check the line between the IC3704 and the loading motor. Check CN3702.See FLOW CHART NO.6. <The [No Disc] indication. (In case focus servo does not function.)>Is there input signal on the pins(49), (50), (51), (52) of IC3301?Check the connection of optical pickup cable. If it is normal, replace the optical pickup.
Yes
NoNoNoNoNoNoNoNoNoNo
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 from pin(1) terminal of receiver when the infrared remote control is activated?Is pulse signal supplied to the pin(42) of IC3501?FLOW CHART NO.4The disc tray cannot be opened and closed.Is the LOAD signal inputted to R3763?Is loading motor drive voltage outputted from the pins(11) and (12) of IC3704?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 outputted from the pin(22) of IC3301 when the disc is set?Is FE signal inputted into the pin(117) of IC3701?Check or replace IC3701.Check the line between the IC3301 and IC3701.
2
�
PLAY
SW8052KEY
�1
OFFSTOP
SW8053KEY
YesYes
Check the STBY 5V line.Check the pins(38) and (39) of IC8051 and their periphery circuit.Check signal line of LCD RESET, LCD CS, LCD DATA, LCD CLK on pins(6), (12), (8) (10) of IC801.Check the signal lines between IC801 and IC8051.Check signal of LCD RESET, LCD CS, LCD DATA, LCD CLK on pins(5), (13), (9), (11) of IC801.Check or replace IC801.Check signal line between IC3501 and IC801.Check periphery circuit of pin(41) of IC8051.Replace IC8051.Replace key switch.
NoNo
0V
3.3V2.5V1.8V0.9V
NoNoNoNoNoNoKEY-1/2
YesYesYesYesYesYes
FLOW CHART NO.1The fluorescent display tube does not light.Is the supply voltage of 5V fed up to pin(37) of IC8051?Is the supply voltage of 3.4V, 1.7V fed up to pin (38), (39) of IC8051?Check the signal lines of LCD RESET, LCD CS, LCD DATA, LCD CLK on pins(36), (42), (43), (44) of IC8051.Is the OSC signal present on pin(41) of IC8051?Are common and segment signals supplied from IC8051 (LCD driver IC) to LCD8052 (LCD)?Check that the flourescent display tube is free from damages.FLOW CHART NO.2The key operation is disabled.Is key switch contact and installation state normal?Is the control voltage normally into the pins(72), (73) of IC3501?
(DVD)
60 |
ACEC
