CMT-DC500MD, HCD-J300 - Sony Audio Service Manual (repair manual). Page 26

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If the nonvolatile memory data is abnormal, “E001 MEMORY NG” will be displayed so that the MD deck does not continue operations. In

this case, set the test mode promptly and perform the following procedure.

Procedure:
1. Enter the MD test mode.
2. Normally a message for selecting the test mode will be displayed. However if the nonvolatile memory is abnormal, the following will be

displayed “INIT EEP?”.

3. Press the

x

(MD) and Z (MD) buttons simultaneously.

4. Press the

. “R”

or

 > “R”

button to display “MDM-7B”.

5. Press the

REC MODE

button. If the nonvolatile memory is successfully overwritten, the normal MD test mode will be set and a message

to select the MD test mode will be displayed.

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 6  Electrical Adjustments”.

• 0.9 mW power

Specified value : figure1

• 7.0 mW power

Specified value : figure2

Iop (at 8.4mW)

• Labeled on the optical pick-up

Iop value ± 10mA

• Unsatisfactory if displayed as “NG : XXXX”NG

(XXXX are arbitrary numbers)

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

NG
(@@, ## are both arbitrary numbers)

Laser power check
(6-2 : See page 32)

Auto check
(6-7 : See page 33)

Temperature
compensation
offset check
(6-1 : See page 32)

• 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 board)

• Check the signals around IC101, IC151, CN102,

CN103 (BD board)

Note:
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.

Figure1:

SPECIFIED VALUE

KMS-260B
KMS-260E

0.85 to 0.91 mW
0.90 to 0.96 mW

Figure2:

SPECIFIED VALUE

KMS-260B
KMS-260E

6.8 to 7.2 mW
7.0 to 7.5 mW

[CD SERVO Test Mode]
• Use this mode when checking CD servo.

Procedure:
1.

Press  ?/1  button to turn the set ON.

2.

Select the function “CD”.

3.

Press three buttons  M  (TAPE),  SYNCHRO REC  and  >  (MD) simultaneously.

4.

Press the appropriate button for the following tests.

Button

Function Button

Function

Z(CD)

TEST 1

PLAY MODE DIRECTION

TEST 6

x(CD)

TEST 2

u(CD)

TEST 7

>

TEST 3

x(MD)

TEST 8

.

TEST 4

x(TAPE)

TEST 9

REPEAT TEST 5

5.

To exit from this mode, turn off the set.