CMT-M100MD, HCD-M10 - Sony Audio Service Manual (repair manual). Page 33

33

These checks are performed before replacing parts according to
“approximate specifications” to determine the faulty locations. For
details, refer to “Checks Prior to Parts Replacement and Adjustments
in MD” (see page 7).

When performing adjustments, set the internal temperature and room
temperature to 22 to 28ºC.

Procedure:
1. Press the

. 

“R” or

> 

“R” button to display “TEMP

CHECK” (C12).

2. Press the ENTER/YES “R” button.
3. “T=@@(##) [OK]” should be displayed. If “T=@@ (##) [NG]”

is displayed, it means that the results are bad.
(@@ indicates the current value set, and ## indicates the value
written in the non-volatile memory.)

Before checking, check the Iop value of the optical pick-up.
(Refer to 8. Recording and Displaying the Iop Information (see page
36)

Procedure:
1. Set the laser power meter on the objective lens of the optical

pick-up. (When it cannot be set properly, press the  m

 

  button

or  M  button to move the optical pick-up.)
Connect the digital volt meter to CN105 pin 1 (I+3V) and
CN105 pin 2 (Iop).

2. Then, press the

.

“R” or

> 

“R” button and display

“LDPWR CHECK” (C13).

3. Press the ENTER/YES “R” button once and display “L

0.9mW$

”. Check that the reading of the laser power meter

becomes specified value.

4. Press the ENTER/YES “R” button once more and display “ L

7.0mW$

”. Check that the reading the laser power meter and

digital volt meter satisfy the specified value.

Specified Value:
Laser power meter reading :

Digital voltmeter reading : Optical pick-up displayed value 

±

 10%

5. Press the MENU/NO “R” button and display “LDPWR

CHECK” (C13) and stop the laser emission.
(The MENU/NO “R” button is effective at all times to stop the
laser emission.)

After step 4, each time the ENTER/YES “R” button is pressed,

the display will be switched to “L 0.7mW$

”and “L 6.2mW$

”.Nothing needs to be performed here.

Checking Location: BD board (see page 40)

The current Iop value at laser power 7 mW output and reference
Iop value (set at shipment) written in the nonvolatile memory are
compared, and the rate of increase/decrease will be displayed in
percentage.

Perform this function with the optical pick-up set at room tempera-
ture.

Procedure:
1. Press the

.

“R” or

>

 

“R” button to display “Iop Compare”

(C27).

2. Press the ENTER/YES “R” button and start measurements.
3. When measurements complete, the display changes to “

±

 xx%

yy”.
xx is the percentage of increase/decrease, and OK or NG is
displayed at yy to indicate whether the percentage of increase/
decrease is within the allowable range.

4. Press the MENU/NO “R” button to end.

* This disc is used in focus bias adjustment and error rate check.

The following describes how to create a continuous recording
disc.

1. Insert a disc (blank disc) commercially available.
2. Press the

. 

“R” or

>

   

“R” button and display “CREC

1MODE” (C35).

3. Press the ENTER/YES “R” button again to display “CREC 1

MID”.
Display “CREC 1(0300)” and start to recording.

4. Complete recording within 5 minutes.
5. Press the MENU/NO “R” button and stop recording .
6. Press the Z MD  button and remove the disc.

The above has been how to create a continuous recorded data for
the focus bias adjustment and error rate check.

 Be careful not to apply vibration during continuous recording.

Optical pick-up
objective lens

laser
power meter

+
–

BD board

digital voltmeter

CN105 pin 

1

 (I+3V)

CN105 pin 

2

 (Iop)

KMS260E

20101

H0576

lop=57.6 mA in this case
lop (mA) = Digital voltmeter reading (mV)/1 (

Ω

)

(Optical pick-up label)

For details of the method for
checking this value, refer to 
“8. Recording and Displaying
the Iop Information”

L 0.9 mW
L 7.0 mW

0.80 to 0.96 mW
6.80 to 7.20 mW