Sony HCD-MD555, Service Manual

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IOP DATA RECORDING AND DISPLAY WHEN THE OPTICAL PICKUP AND NON-VOLATILE MEMORY
(BD (MD) BOARD IC171) IS REPLACED
The IOP value that is indicated on the optical pickup unit can be saved in the non-volatile memory. By saving the IOP value saved in the non-
volatile memory, it is no more necessary to read the IOP value on the optical pickup unit. It is recommended to save the IOP value saved in
the non-volatile memory when the optical pickup unit and/or non-volatile memory (BD (MD) board IC171) is replace as the followings.
How to save the IOP value in the non-volatile memory:
1. Turn on the power and select the MD function. Press the three buttons simultaneously, i.e., the ENTER/YES , NAME EDIT , and
MD3 buttons to activate the test mode.
2. Turn the MULTI JOG dial to show the message “[service]” on display. Press the ENTER/YES button.
3. Turn the MULTI JOG dial to show “Iop Write” (28) on display. Press the ENTER/YES button.
4. “REF=@@@.@” (@ is an arbitrary number) appears, and the number that can be changed as described in the next step, flashes.
5. Input the IOP value that is indicated on the optical pickup, as follows.
Selection of numeral : Select a number by turning the MULTI JOG dial.
Selection of digit
: Select the desired digit by pressing the MD WALKMAN SYNC button.
6. Press the ENTER/YES button and the message “Measu=@@@.@” appears. (@ is an arbitrary number.)
7. Press the ENTER/YES button without changing the number because the result data of adjustment is saved as the value of step 6.
8. The message “Complete!!” appears for a moment. This value is saved in the non-volatile memory, and the message “Iop Write” is
displayed.
9. After saving is complete, press the REPEAT button to return to the normal operating mode.
How to display the IOP value saved in the non-volatile memory:
1. Turn on the power and select the MD function. Press the three buttons simultaneously, i.e., the ENTER/YES , NAME EDIT , and
MD3 buttons to activate the test mode.
2. Turn the MULTI JOG dial to show “[Service]” on display. Press the ENTER/YES button.
3. Turn the MULTI JOG to show “Iop Read” (C27) on display.
4. “@@.@/##.#” appears, and the saved contents are displayed.
@@.@ : The Iop value that is indicated on the pickup
##.#
: The Iop value after adjustment is complete
5. To exit this mode, press the MENU/NO button to show “Iop Read” on display. Press then the REPEAT button to return to the normal
operating mode.