Sony MDS-JB920 Service Manual Download

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7. INITIAL SETTING OF ADJUSTMENT VALUE

Note:

Mode which sets the adjustment results recorded in the non-volatile
memory to the initial setting value. However the results of the tempera-
ture compensation offset adjustment will not change to the initial setting
value.
If initial setting is performed, perform all adjustments again excluding the
temperature compensation offset adjustment.
For details of the initial setting, refer to “4. Precautions on Adjustments”
and execute the initial setting before the adjustment as required.

Setting Procedure :
1. Rotate the

[ AMS ]

knob to display “ADJ CLEAR

(C24)”.

2. Press the

[YES]

button. “Complete!” will be displayed mo-

mentarily and initial setting will be executed, after which “ADJ
CLEAR” will be displayed.

8. RECORDING AND DISPLAYING THE IOP

INFORMATION

The IOP data can be recorded in the non-volatile memory. The
IOP value on the label of the optical pickup and the IOP value
after the adjustment will be recorded. Recording these data elimi-
nates the need to read the label on the optical pick-up.

Recording Procedure :
1. While pressing the

[ AMS ]

knob and

button,

connect the power plug to the outlet, and release the

[ AMS ]

knob and

button.

2. Rotate the

[ AMS ]

knob to display “[Service]”, and

press the

[YES]

button.

3. Rotate the

[ AMS ]

knob to display “Iop.Write” (C28),

and press the

[YES]

button.

4. The display becomes Ref=@@@.@ (@ is an arbitrary num-

ber) and the numbers which can be changed will blink.

5. Input the IOP value written on the optical pick-up.

To select the number : Rotate the

[ AMS ]

knob.

To select the digit : Press the

[ AMS ]

knob

6. When the

[YES]

button is pressed, the display becomes

“Measu=@@@.@” (@ is an arbitrary number).

7. As the adjustment results are recorded for the 6 value. Leave

it as it is and press the

[YES]

button.

8. “Complete!” will be displayed momentarily. The value will

be recorded in the non-volatile memory and the display will
become “Iop Write”.

Display Procedure :
1. Rotate the

[ AMS ]

knob to display “Iop.Read”(C27).

2. “@@.@/##.#” is displayed and the recorded contents are dis-

played.
@@.@ indicates the Iop value labeled on the pick-up.
##.# indicates the Iop value after adjustment

3. To end, press the

[ AMS ]

button or

[MENU/NO]

button

to display “Iop Read”.

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[ ]

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9. TEMPERATURE COMPENSATION OFFSET

ADJUTMENT

Save the temperature data at that time in the non-volatile memory
as 25 ˚C reference data.

Note :

1. Usually, do not perform this adjustment.
2. Perform this adjustment in an ambient temperature of 22 ˚C to 28 ˚C.

Perform it immediately after the power is turned on when the internal
temperature of the unit is the same as the ambient temperature of 22 ˚C
to 28 ˚C.

3. When D101 has been replaced, perform this adjustment after the tem-

perature of this part has become the ambient temperature.

Adjusting Procedure :
1. Rotate the

[ AMS ]

knob and display “TEMP ADJUS”.

2. Press the

[YES]

button and select the “TEMP ADJUS” mode.

3. “TEMP =

[OK” and the current temperature data will be

displayed.

4. To save the data, press the