MDS-JB980 - Sony Audio Service Manual (repair manual). Page 6

6

The special jig (J-2501-196-A) is useful for checking the waveform of the BD board. The names of terminals and the checking items to be
performed are shown as follows.

GND : Ground
I+3V : For measuring Iop (Check the deterioration of the optical pick-up laser)
Iop

: For measuring Iop (Check the deterioration of the optical pick-up laser)

TE

: TRK error signal (Traverse adjustment)

VC

: Reference level for checking the signal

RF

: RF signal (Check jitter)

FE

: Focus error signal

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 label of the optical pick-up. When replacing the optical pick-up, record the Iop value on the optical pick-up
according to the following procedure.

Record Procedure:
1. While pressing the  l AMS L  knob and  x  button, connect the power plug to the outlet, and release the  l AMS L  knob and

x  button.

2. Rotate the  l AMS L  knob to display “[Service]”, and press the  YES  button.
3. Rotate the  l AMS L  knob to display “Iop Write” (C05), 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  l AMS L  knob.
To select the digit

: Press the  l AMS L  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.

Display Procedure:
1. While pressing the  l AMS L  knob and  x  button, connect the power plug to the outlet, and release the  l AMS L  knob and

x  button.

2. Rotate the  l AMS L  knob to display “[Service]”, and press the  YES  button.
3. Rotate the  l AMS L  knob to display “Iop Read” (C26).
4. “@@.@/##.#” is displayed and the recorded contents are displayed.

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

: indicates the Iop value after adjustment

5. To end, press the  l AMS L  button or  MENU/NO  button to display “Iop Read”. Then press the  REPEAT  button.

CN105

RF

VC

TE

IOP

I+3V

GND

RF

VC

for 
MDM-7S1A

IOP

TE

I+3V

GND

VC

RF

TE

IOP

I+3V

GND

1

7

FE

FE

FE