The servo circuit of this model is designed to be adjustment-free and the adjustment value and disc distinction (CA-DA. CD-R and CD-
RW etc.) is adjusted by within the IC. Therefore the adjustment is performed by each TOC reading. The adjustment conditions within the
IC of each servo can be monitored in this test mode.
1. How to start the Test Mode
Starting method of the test mode differ depending upon the type of disc being used. This is because the adjustment values of each
servo also differ depending upon the type of disc.
When using the CD-DA or CD-R
1)
Short-circuit the test land and the OPEN/CLOSE SW land.
2)
Insert the AC plug and install the CD-DA or CD-R disc.
3)
Press the PLAY and STOP buttons in this sequence and read the TOC.
4)
Press the DISPLAY/ENTER button and confirm that all LCD light up.
When using the CD-RW
1)
Short-circuit the test land and the OPEN/CLOSE SW land.
2)
Insert the AC plug and install the CD-RW disc.
3)
Press the PLAY, STOP and DSL buttons in this sequence and read the TOC. The LCD display should display CD-r at this point.
4)
Press the DISPLAY/ENTER button and confirm that all LCD light up.
Note 1) If the TOC cannot be read, press the DISPLAY/ENTER button once “Err” has appeared on the LCD, causing all the LCDs to
become lit up. The following steps 2 and 3 can be confirmed even if the TOC cannot be read.
Note 2) By repeatedly pressing the DISPLAY/ENTER button, all LCD will light up and the TOC display will be repeated.
Note 3) By repeatedly pressing the DSL button, the “CD-d” and “CD-r” displays will be repeated.
When the LCD displays “CD-d,”
→
CD-DA, CD-R is selected.
When the LCD displays “CD-r,”
→
CD-RW is selected.
Note 4) The test mode is cancelled by disconnecting the AC plug and removing the soldering of short land.
2. DISC distinction (confirmation of FE waveform)
This mode is possible to perform a confirmation of the disc distinction.
Confirmation method
1)
Press the DSL button and select “CD-d” or “CD-r” (Refer to Note 3).
2)
Install the disc.
3)
Press the MODE button.
The LCD will change as follows.
Example: Test disc: TCD-782, DISC type select: CD-d, Judgement value: 7F, Measurement value: 3D BE.
Measurement value
*All numerical values are displayed in HEX
LCD displays “CD-r”
No disc
No disc
CD-RW
No disc
32 < Judgment value < C8
CD-DA and CD-R
CD-RW
C8 < Judgment value
CD-DA and CD-R
The state of the FE waveform can also be understood from this judgment value.
3. Confirmation of sled movement
By pressing the F. SKIP or B. SKIP button continuously when all LCD light up, it is possible to transfer the pick-up to either the outer
circumference or the inner circumference (the LCD is to remain all light up).
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