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CD TEST MODE
1. How to activate CD test mode
1) Remove the resistor R907 (100kΩ) from the MAIN C.B, and add
R999C 22kΩ or chip resistor to the MAIN C.B. (Fig. 1)
2) Connect +12V to ACC/BACK UP and – (minus) to the ground of
the CONNECTOR ASSY.
3) Turn on the power.
4) Test mode will be activated and all LCD display will light up.
(Fig. 2)
2. How to cancel CD test mode
1) Turn off +12V to ACC/BACK UP
2) Solder back the resistor R907 (100kΩ) and remove the R999
(22kΩ) from the MAIN C.B
3) Disconnect +12V from ACC/BACK UP and – (minus) from the
ground of the CONNECTOR ASSY.
Ω
Ω
Fig. 1
Fig. 2
3. CD test mode functions
Mode
Operation Key
LCD Display
Start Mode
All LCD light up
Search Mode
RANDOM
• TOC reading
Play Mode
REPEAT 1
• Display Track No. and Play time
• Display Level/Ing.
Traverse Mode
INT
• Display Track No. and Play time
Stop Mode
REPEAT
All LCD light up
Sled Mode
All LCD light up
• Do not insert the CD disc when checking the search mode.
• Press the REPEAT key to release each mode.
* 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.
In this case, the power supply should be switched off for 10 minutes until the heat has been reduced and then re-start.
– 28 –
Operation
Contents
Activate test mode
DISC LOADING
• Loading
UNLOADING
• All servo off
DISC CHUCKING
• Laser on
• VCC on
• Continual focus search
• Check APC circuit
(The pickup lens repeat the
• Laser current measurement
full-swing)
• Check focus error waveform
* NOTE 1
• Focus servo
• Normal playback
• Tracking servo
• Same operation as search mode if
• CLV servo
TOC cannot be read
• SLED servo
Playback pause status
Tracking servo off
Wait status
• All servo off
• Laser on/off
• Pickup moves to outer track
• Sled servo
• Pickup moves to inner track
• Check mechanism operation
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