CMT-M333NT, HCD-M333 - Sony Audio Service Manual (repair manual). Page 13

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The Iop value labeled on the optical pick-up can be stored in the non-volatile memory. By storing the value, it will eliminate the need to look
at the value on the label of the optical pick-up. When replacing the optical pick-up or non-volatile memory (IC195 of BD (MD) board), store
the Iop value on the optical pick-up according to the following procedure.

Record Precedure:
1. Press the   ?/1

  

button to turn on the power.

2. Press the  FUNCTION  button to select the “MD” function.
3. While pressing the  x  button and the  REC MODE  button at the same time, press the  Z  (MD) button.
4. Press the  

>

 “R”  button to display “[Service]”. Then press the  ENTER/YES “R”  button.

5. Press the  

>

 “R”  button to display “Iop Write” (C05) and press the  ENTER/YES “R”  button.

6. The display becomes “Ref=@@@.@” (@ is an arbitrary number) and the numbers which can be changed will blink.
7. Input the Iop value written on the optical pick-up.

To select the number : Press the  

.

 “R”  button or the  

>

 “R”  button.

To select the digit

: Press the  TIMER SET “R”  button.

8. When the  ENTER/YES “R”  button is pressed, the display becomes “Measu=@@@.@” (@ is an arbitrary number).
9. As the adjustment results are stored for the 6 value. Leave it as it is and press the  ENTER/YES “R”  button.
10. “Complete!” will be displayed momentarily. The value will be stored in the non-volatile memory and the display will become “Iop

Write” (C05).

11. Press the  REPEAT “R”  button to exit the mode.
12. Press the  ?/1  button to turn off the power.

Display Precedure:
1. Press the  ?/1  button to turn on the power.
2. Press the  FUNCTION  button to select the “MD” function.
3. While pressing the  x  button and the  REC MODE  button at the same time, press the  Z  (MD) button.
4. Press the  

>

 “R”  button to display “[Service]”. Then press the  ENTER/YES “R”  button.

5. Press the  

>

 “R”  button to display “Iop Read” (C26) and press the  ENTER/YES “R”  button.

6. “@@.@/##.#” is displayed and the recorded contents are displayed.

@@.@ : indicates the Iop value labeled on the optical pick-up
##.#

: indicates the Iop value after adjustment

7. To end, press the  MENU/NO “R”  button to display “Iop Read” (C26). Then press the  REPEAT “R”  button.
8. Press the  ?/1  button to turn off the power.

Before performing repairs, perform the following checks to determine the faulty locations up to a certain extent.
Details of the procedures are described in “Section 5  Electrical Adjustments”.

The criteria for determination above is intended merely to determine if satisfactory or not, and does not serve as the specified value for adjustments.
When performing adjustments, use the specified values for adjustments.

• 0.93 mW power

Specified value : 0.84 to 0.92 mW (KMS-262A)

0.90 to 0.96 mW (KMS-262E)

• 8.65 mW power

Specified value : 8.1 to 8.7 mW (KMS-262A)

8.4 to 8.9 mW (KMS-262E)

• Iop (at 8.65 mW)

Labeled on the optical pick-up

Iop value 

±

 10mA

• Unsatisfactory if displayed as “NG : XXXX”

(XXXX are arbitrary numbers)

• Unsatisfactory if displayed as “T=@@ (##) [NG]”

(@@, ## are both arbitrary numbers)

Laser power check

(6-2 : See page 39)

Auto check

(6-4 : See page 40)
Temperature

compensation

offset check

(6-1 : See page 39)

Criteria for Determination
(Unsatisfactory if specified value is not satisfied)

• Clean the optical pick-up

• Adjust again

• Replace the optical pick-up

• Replace the optical pick-up

• Replace the optical pick-up

• Check for disconnection of the circuits around

D101 (BD (MD) board)

• Check the signals around IC101, IC151, CN102,

CN103 (BD (MD) board)

Measure if unsatisfactory