TEST MODE
There are two methods to perform operation check using test mode. One method uses the head unit. The other method uses the repair
jig. Because different operation buttons must be used for entering the operation modes and there are cases that unit does not run at all,
in the method that uses the head unit, the method using the repair jig is described as follows;
1.How to start up the CD test mode
Connect the P.W.B Key in accordance with the step (6). OHow to use the repair jig - When the Control Unit (CDC/CT) is not
used� as described before in "NOTE ON BEFORE SERVICING".
1) While pressing the STOP button of the P.W.B Key, turn on the +12 V power of ACC/BACK UP.
2.How exit the CD test mode
1) Turn off the +12 V power of ACC/BACK UP.
3.Function description of CD test mode
Uses of the respective buttons of the P.W.B Key are
described in Fig-11.Fig-11
YDuring the PLAY mode, the REV, FWD and DISC UP keys are invalid. Press the STOP key once.
YWhen a Head Unit is connected, the Disc No. and the Track No. are shown on display in the same way as in the normal
operation.
ModeOperation keyOperationContents
Servo OFFSTOPAll servo off
Search modeFOCUSContinuous focus searchAPC circuit check
Pickup lens repeats full swing (Note 1)Laser current measurement
Focus error waveform check
Play modeFOCUSNormal playbackFocus servo
VTracking servo
SV ONCLV servo
Sled servo
Sled modeFWDPickup moves to outer circumferenceSled servo
RVSPickup moves to inner circumferenceMechanism operation check
CD changeDISC UPDisc unloadMechanism operation check (cyclic)
V
Magazine change
V
Disc load
Note 1: If the focus search operation is continued for 10 minutes or longer, the driver IC heats up sufficiently to trigger the
protection circuit, which stops the CD system. Turn off the main power and re-start operation about 10 minutes later.
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ACEC
