MDS-W1 - 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.

For buttons or knobs not specified as (Deck A) or (Deck B) in the procedure, use that of the corresponding deck.

Record Precedure:
1. With the power ON, press the  0 (Deck B)  button while pressing the  OUTPUT  and  CLEAR (Deck A)  buttons together.
2. Rotate the  AMS  knob to display “(Service)”, and press the  YES  button.
3. Rotate the  AMS  knob to display “lop.Write” (S: 28), 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. The value will be recorded in the non-volatile memory and the display will become “Iop Write”.
9. Press the  MD SYNC  button to complete.

Display Precedure:
1. With the power ON, press the  0 (Deck B)  button while pressing the  OUTPUT  and  CLEAR (Deck A)  buttons together.
2. Rotate the  AMS  knob to display “(Service)”, and press the  YES  button.
3. Rotate the  AMS  knob to display “lop.Read” (S: 27).
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  MD SYNC  button.