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5

• As this set has not own power supply, it does not operate indepen-

dently. Therefore, during servicing, connect it to the Pre-Main
amplifier and Tuner Unit (STR-NX5MD) of DHC-NX5MD.

If STR-NX5MD are not available, use the Power Feed Jig (PFJ-
1) and Relay Connector Jig.
In this case, after turn on the POWER switch on the Power Feed
Jig, supply power with the following methods.

Procedure:
1. Press three buttons of G (MD), A (DISC 1), and s (CD)

simultaneously.

function

button

CD AMS –

AMS –

AMS +

AMS +

FR

m

FF

M

MD AMS –

AMS –

AMS +

AMS +

FR

m

FF

M

6

Note 1: In cleaning the lens, do not apply an excessive force.

As the optical pick-up is vulnerable, application of excessive
force could damage the lens holder.

Note 2: In cleaning, do not use a cleaner other than exclusive clean-

ing liquid (KK-91 or isopropyl alcohol).

Note 3: Wipe the objective lens spirally from center toward outside.

(See Figure A)

1

 Remove the case. (Refer to disassembly page 13)

2

3

4

7

The special jig (J-2501-196-A) is useful for checking the waveform of the BD (MD) 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

8

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 or non-volatile memory (IC195 of BD board),
record the Iop value on the optical pick-up according to the following procedure.

Record Precedure:
1. Clicking the  ENTER/YES  button and the  A  (DISC 5) button while clicking the  m  (MD) button causes the program to enter test mode

and the message “Check” to be displayed on screen.

2. Rotate the  MD JOG  knob to display “[Service]”, and press the  ENTER/YES  button.
3. Rotate the  MD JOG  knob to display “Iop Write” (C05), 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 : Rotate the  MD JOG  knob.
To select the digit

: Press the  MD JOG  knob.

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 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” (C05).

9. Press the STR  REPEAT  button to complete.

Display Precedure:
1. Clicking the  ENTER/YES  button and the  A  (DISC 5) button while clicking the  m  (MD) button causes the program to enter test mode

and the message “Check” to be displayed on screen.

2. Rotate the  MD JOG  knob to display “[Service]”, and press the  ENTER/YES  button.
3. Rotate the  MD JOG  knob to display “Iop Read” (C26).
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  MD JOG  button or  MENU/NO  button to display “Iop Read” (C26). Then press the  REPEAT  button.