DHC-MD777, HMC-MD777 - Sony Audio Service Manual (repair manual). Page 8

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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 on BD (MD) board), record the
IOP value on the pick-up according to the following procedure.

Record Precedure:
1. Enter the test mode. (See the “SECTION 5 TEST MODE” for detail of test mode)
2. Turn the

≠

↔

± dial to display “[Service]”, and press the

[ENTER/YES]

button.

3. Turn the

≠

↔

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

[ENTER/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: Turn the

≠

↔

± dial.

To select the digit

: Press the

[MD WALKMAN SYNC]

button.

6. When the

[ENTER/YES]

button is pressed, the display becomes “Measu=@@@.@” (@ is an arbitrary number).

7. As the adjustment results are recorded for the step 6. value. Leave it as it is and press the

[ENTER/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, and the set returns to normal mode.

Display Precedure:
1. Enter the test mode. (See the “SECTION 5 TEST MODE” for detail of test mode)
2. Turn the

≠

↔

± dial to display “[Service]”, and press the

[ENTER/YES]

button.

3. Turn the

≠

↔

± dial to display “Iop Read” (C27).

4. Press the

[ENTER/YES]

button. “@@.@/##.#” 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

[MENU/NO]

button to display “Iop Read”. Then press the

[REPEAT]

button, and the set returns to normal mode.

This mode is test for fluorescent indicator tube, LED, buttons and jog dial.
This mode can not exit in the middle of the test, therefore finish the test when enter this mode.

Fluorescent Indicator Tube and Buttons Test Mode
1. While pressing the both

[ENTER/YES]

and

[REC]

buttons, turn the power ON.

2. After display “FL AllOn key”, lights up all segments on fluorescent indicator tube immediately.
3. Press every buttons of except

[MD WALKMAN SYNC]

button on the MD section, then each segment goes off and remain the “L-

SYNC”.

4. Press the

[MD WALKMAN SYNC]

button to display “Push YES”.

5. Press the

[ENTER/YES]

button and switch over to next check mode “5x7 Segments on Fluorescent Indicator Tube check”.

1. After display “Seg Chk”, 5x7 segments part changes to display mesh pattern immediately.
2. Press the

[ENTER/YES]

button to display “Jog & LED”, and switch over to next check mode “JOG & LED Check”.

1. Each time the

≠

↔

± dial is turned,

[MD WALKMAN SYNC]

LED lights on/off and

[MD1-5]

LED color changes into green/

amber.

2. Press the

[ENTER/YES]

button to display “Check End!”.

Press the

[ENTER/YES]

button: Exit to “Display Test Mode” and enter the other test mode.

Press the

[MENU/NO]

button : Repeat the “Display Test Mode”