AIWA CDCRV407YZ Repair Manual

CD TEST MODE
1. How to activate CD test mode3. CD test mode functions
1) Remove the resistor R907 (100k&) from the MAIN C.B, and add
ModeOperation KeyLCD DisplayOperationContents
R999C 22k& or chip resistor to the MAIN C.B. (Fig. 1)
2) Connect +12V to ACC/BACK UP and � (minus) to the ground of
Start ModeAll LCD light upActivate test mode
the CONNECTOR ASSY.
3) Turn on the power.DISC LOADINGY Loading
4) Test mode will be activated and all LCD display will light up.
&UNLOADINGY All servo off
(Fig. 2)
DISC CHUCKINGY Laser on
Y VCC on
&
Y Continual focus search
Y Check APC circuit
Search ModeRANDOM(The pickup lens repeat the
Y Laser current measurement
full-swing)
Y Check focus error waveform
*NOTE 1
Y TOC readingY Focus servo
Y Normal playback
Play ModeREPEAT 1Y Display Track No. and Play timeY Tracking servo
Fig. 1Y Same operation as search mode if
Y Display Level/Ing.Y CLV servo
TOC cannot be read
Y SLED servo
Traverse ModeINTY Display Track No. and Play timePlayback pause statusTracking servo off
Stop ModeREPEATAll LCD light upWait statusY All servo off
Y Laser on/off
Y Pickup moves to outer track Y Sled servo
Sled ModeAll LCD light up
Y Pickup moves to inner track Y Check mechanism operation
Y Do not insert the CD disc when checking the search mode.
Y Press the REPEAT key to release each mode.
Fig. 2
* NOTE 1 : There is a case that the CD cannot be operated owing to the protection circuit being operated when heat builds up in the driver IC if
the focus search is opereated continually for more than 10 minutes.
2. How to cancel CD test modeIn this case, the power supply should be switched off for 10 minutes until the heat has been reduced and then re-start.
1) Turn off +12V to ACC/BACK UP
2) Solder back the resistor R907 (100k&) and remove the R999
(22k&) from the MAIN C.B
3) Disconnect +12V from ACC/BACK UP and � (minus) from the
ground of the CONNECTOR ASSY.
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