MDS-JB920 - Sony Audio Service Manual (repair manual). Page 7

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The IOP value labeled on the pick-up can be recorded in the non-volatile memory. By recording the value, it will eliminate the need to look
at the value on the label of the optical pick-up. When replacing the pick-up or non-volatile memory (IC171 of BD board), record the IOP
value on the pick-up according to the following procedure.

Record Precedure:
1. While pressing the 

[        AMS        ]

 knob and p button, connect the power plug to the outlet, and release the 

[        AMS        ]

 knob

and p button.

2. Rotate the 

[        AMS        ]

 knob to display “[Service]”, and press the 

[YES]

 button.

3. Rotate the 

[        AMS        ]

 knob to display “lop.Write” (C28), and press the 

[YES]

 button.

4. The display becomes “Ref=@@@.@” (@ is an arbitrary number) 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”.

9. Press the 

[REPEAT]

 button to complete. “Standby” will be displayed.

Display Precedure:
1. While pressing the 

[        AMS        ]

 knob and  p  button, connect the power plug to the outlet, and release the 

[        AMS        ]

 knob

and  p  button.

2. Rotate the 

[        AMS        ]

 knob to display “[Service]”, and press the 

[YES]

 button.

3. Rotate the 

[        AMS        ]

 knob to display “lop.Read” (C27).

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

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

: indicates the Iop value after adjustment

5. To end, press the 

[        AMS        ]

 button or 

[MENU/NO]

 button to display “Iop Read”. Then press the 

[REPEAT]

 button to display

“Standby”.

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