MDS-JB930 - Sony Audio Service Manual (repair manual). Page 7

7

The IOP value labeled on the optical 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 optical pick-up label. When replacing the optical pick-up or non-volatile memory (IC171 of BD board), record
the IOP value on the optical pick-up according to the following procedure.

Record Procedure:
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. Turn the 

[        AMS        ]

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

[YES]

 button.

3. Turn 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 label.

To select the number : Turn 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 

[FILTER]

 button to complete.

Display Procedure:
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. Turn the 

[        AMS        ]

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

[YES]

 button.

3. Turn the 

[        AMS        ]

 knob to display “lop Read” (C27).

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

@@.@ : indicates the IOP value on the optical pick-up label.
##.#

: indicates the IOP value after adjustment

5. To end, press the 

[        AMS        ]

 knob or 

[MENU/NO]

 button to display “Iop Read”. Then press the 

[FILTER]

 button.

The system microprocessor can be reset in the following procedure.
Use these procedure when the unit cannot be operated normally due to the overrunning of the microprocessor, etc.
Procedure :
Disconnect the power plug, short-circuit jumper wire of JW705 and JW706 (RESET).

– BAT BOARD (Component Side) –

[  ]

[  ]

±

≠

±

≠

±

≠

±

≠

±

≠

±

≠

±

≠

±

≠

±

≠

±

≠

[  ]

±

≠

[  ]

JW706 JW705

CN703