CMT-C7NT, HCD-C7NT - Sony Audio Service Manual (repair manual). Page 30

30

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

• 0.9 mW power

Specified value : figure1

• 8.4 mW power

Specified value : figure2

Iop (at 8.4mW)

• Labeled on the optical pick-up

Iop value ± 10mA

• Unsatisfactory if displayed as “NG: XXXX”

(X is an arbitrary number)

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

(@@, ## are both arbitrary numbers)

Laser power check
(6-2 : See page 37)

Auto check
(6-4 : See page 38)

Temperature
compensation
offset check
(6-1 : See page 37)

(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)

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

• In this test mode, the causes for retry of the unit during recording can be displayed on the fluorescent indicator tube. During

playback, the “track mode” for obtaining track information will be set.
This is useful for locating the faulty part of the unit.

• The following will be displayed.

During recording and stop : Retry cause, number of retries, and number of retry errors.
During playback

: Information such as type of disc played, part played, copyright.

These are displayed in hexadecimal.

Precedure:
1. Load a recordable disc whose contents can be erased into the unit.
2. Press the  

MENU/NO “R”  

button. When “Edit Menu” is displayed on the fluorescent indicator tube, press the

. 

“R”

or  > 

“R”

  button to display “All Erase?”.

3. Press the  

ENTER/YES “R”

  button.

4. When “All Erase??” is displayed on the fluorescent indicator tube.
5. Press the  

ENTER/YES “R”

  button to display “Complete!”.

6. Press the  

REC/REC IT

  button to start recording. Then press the  u

 

  button and start recording. If recording cannot be performed,

press the  

FUNCTION 

z  button and set a different function.

7. Press three buttons of

  VOL -  

,

  

u

  

and

  CD SYNC HIGH  

simultaneously to enter the retry cause display mode.

8. To check the “track mode”, press the

  

u

  

button to start playback.

9. To release this mode, press the  ?/1  button to turn the power off. When “TOC” goes off, disconnect the power plug from the

outlet.
If the test mode cannot be released, refer to “Factory Preset” on page 24.

KMS-262A

KMS-262E

8.1 to 8.7 mW
8.4 to 8.9 mW

KMS-262A

KMS-262E

0.84 to 0.92 mW
0.90 to 0.96 mW