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ADJUSTMENT
Microcomputer built in the unit, comprises service program to facilitate servo adjustment by pushing operation button.
1. Start service program
(1) Turn power switch OFF.
(2) Shortcircuit J6 (SWOP) and J8 (SWCL) of TP102 on P.W.B. (Main Unit)
(Caution) Do not touch other jumper wires..
(3) Turn power switch ON.
(Service program starts, and displays track number
[jf | )
(Caution)
* When service program started normal operation of buttons will be defeated.
ee
4 OPEN/CLOSE
Opens or closes the disc holder.
@ Opens or closes only when disc is stopped.
@ Operate other keys after open or close.
-
@ STOP
Stops system function.
@ Displays track number {J /.
@ Push when adjustment completed, or do it again.
»
PLAY
Starts focus servo and disc turns.
@ Push when adjust tracking offset.
,
|
@ When completed, displays track number Gc' .
*
a
Hf PAUSE
Starts focus servo, tracking servo,
| @ When PLAY button is pushed, starts tracking servo and slide servo.
slide servo, spindle servo.
@ When completed, track number
973 .
;
Other button
No normal operation.
@ Do not operate buttons other than above.
@ If misoperated, immediately turn power switch OFF
(Caution)
* Do not use remote control during service program mode.
2. Service program function
;
3. Adjustment
(1) Necessary equipment for adjustment
1. Dual trace oscilloscope
2. Reference disc (CA-1094) BHT
3. Oscillator (10 Hz ~ 10 kHz, 0 ~ 3 Vp-p)
4. Frequency counter (readable more than 5 KHz)
33 kQ
J7 TEO
O
TO
0.001 pF
O,
FEI[O
TO] Fi
J11 FEO O
TT a Wes
J3 GND O
|O] GND
(Filter for measurement in Main Unit)
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