Kenwood 1050MD Service Manual Download Page 12

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1050MD/DM-5090/DM-9090

CIRCUIT DESCRIPTION

✜

Don't output the laser power of 7.0mW more than 15sec.

7. Next turn the JOG DIAL to display "LDPWR CHECK".

8. Press ENTER key to display "(0.9mW)$##". Check the

laser power meter reads 0.85-0.95mW.

9. Next set range 10mW of the laser power meter, then

press ENTER key to display "(7.0mW)$##". Confirm that
the laser power meter and digital voltmeterat that time
read the specified value.

Specification :
Reading of laser power meter : 7.0

0.1 mW

Reading of digital voltmeter : Optical pick-up indication value

10%

(Optical pick-up label)

In this case, lop = 82.5 mA

lop(mA) = Reading of digital voltmeter (mV)/1(

Ω

)

10. Press the ENTER key to display “LDPWR CHECK” and

stop the laser emission. (The DELETE key can be
pressed at any time to stop the laser emission.)

Note : The "#" display on the screen indicates an arbitrary
figure.

5-6. Traverse Adjustment

Connection :

Adjustment :
1. Connect the oscilloscope to (TE2) and (VC) on the X33

board.

2. Insert a commercial recordable disc.
3. Turn the JOG DIAL to display “EFBAL ADJUST”.
4. Press the ENTER key to display “EFBAL MO-W” and

after that press the ENTER key again to display
"EF=$##MOW".

5. Turn the JOG DIAL so that the waveform on the oscillo-

scope satisfies the specified value. (When the JOG DIAL
is turned, the #-marked figure in "EF=$##" changes and
the waveform also changes.)During this adjustment, the
oscilloscope changes in units of about 3%. Adjust so
that the waveform comes nearest to the specified value.
(MO groove read power traverse adjustment)

6. Press the ENTER key to display "EFB=##XSAVE"

momentarily. After that, "EF=$##MOR" is displayed.
(Laser power READ power, focus servo ON, tracking
servo OFF, and spindle(S) servo ON.)

7. Turn the JOG DIAL so that the waveform on the oscillo-

scope satisfies the specified value. (When the JOG DIAL
is turned, the #-marked figure in "EF-##" changes and
the waveform also changes.) During this adjustment, the
oscilloscope changes in units of about 2%. Adjust so that
the waveform comes nearest to the specified value. (MO
groove read power traverse adjustment)

8. Press the ENTER key to display “EFB=##XSAVE”

momentarily and save the adjustment result in non-
volatile memory After that, "EFBAL MO-P" is displayed.

9. Press ENTER key to display "EF=$##MOP".(A pick-up

moves automatically to pit block area.)

10. Turn the JOG DIAL so that the waveform on the oscillo-

scope comes near to the specified value. During this
adjustment, the waveform changes in units of about 2%.
Adjust so that the waveform comes nearest to the speci-
fied value.

11. Press the ENTER key to display “EFB=##XSAVE”

momentarily and save the adjustment result in non-
volatile memory. After that, “EFBAL CHANGE” is dis-
played. The disc rotation stops automatically.

Note : The "#" display on the screen indicates an arbitrary

figure.

12. Press the EJECT key to take out a recordable disc.
13. Insert test disc TGYS-1.
14. Press the ENTER key to display “EF=$##CD”. A servo

is established automatically.

15. Turn the JOG DIAL so that the waveform on the oscillo-

scope comes near to the specified value. During this
adjustment, the waveform changes in units of about 2%.
Adjust so that the waveform comes nearest to the speci-
fied value.

(Traverse waveform)

In this case, lop = 82.5 mA
lop(mA) = Reading of digital voltmeter(mV)/1(

Ω

)

(optical pick-up label)

KMS

260A

27x40
B0825

TE2
VC

Oscilloscope

X33
ADJUSTMENT

V: 0.5V/div H: 10ms/div
INPUT: DC mode