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7

tray

gear(B)

First turn the whole of cam block in the arrow 

A

 direction with fingers, 

then put out tray by turning gear (B) in the arrow 

B

 direction.

• Perform after removing front panel.

B

A

cam block

Before performing repairs, perform the following checks to determine the faulty locations up to a certain extent.
Details of the procedures are described in “Section 5  Electrical Adjustments”.

The criteria for determination above is intended merely to determine if satisfactory or not, and does not serve as the specified value for adjustments.
When performing adjustments, use the specified values for adjustments.

• 0.9 mW power

Specified value : 0.80 to 0.96 mW

• 7.0 mW power

Specified value : 6.8 to 7.2 mW

Iop (at 7.0mW)

• Labeled on the optical pick-up

Iop value 

±

 10mA

• Unsatisfactory if displayed as “NG : XXXX”NG

(XXXX are arbitrary numbers)

• Unsatisfactory if displayed as “T=@@ (##) [NG]”

NG

(@@, ## are both arbitrary numbers)

Laser power check

(6-2 : See page 33)

Auto check

(6-4 : See page 34)
Temperature

compensation

offset check

(6-1 : See page 33)

Criteria for Determination
(Unsatisfactory if specified value is not satisfied)

• Clean the optical pick-up

• Adjust again

• Replace the optical pick-up

• Replace the optical pick-up

• Replace the optical pick-up

• Check for disconnection of the circuits around

D101 (BD board)

• Check the signals around IC101, IC151, CN102,

CN103 (BD board)

Measure if unsatisfactory

8

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

I+3V

CN105

Iop

TE

VC

GND

FE

RF

I+3V
Iop
GND
TE
FE
VC
RF

I+3V

Iop

GND

TE
FE

VC

RF

1

7

for

MDM-7B4M

9

1

 Floating screw

3

 BU-K4BD43

2

 CD mechanism deck

4

 Rotate it in the 

     direction of the arrow 

A

. 

A

B

5

 Move it in the 

     direction of the arrow 

B

. 

6

 Clean the lens block 

     by cotton swab

Optical pick-up 

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.

In cleaning, do not use a cleaner other than exclusive

   cleaning liquid. (KK-91 or isopropyl alcohol)

Wipe the obujective lens spirally from center toward

    outside. (See Figure A)

(FIGURE A)

10

This section is extracted
from instruction manual.

3

1

6

7

qj

qh

qg

qf

4

8

9

0

qa

qs

qd

qk

ql

w;

wa

CD disc tray qs (9)
CD NX 3 (9, 11)
Cover qj
Display window 4
ENTER/START  qd (22, 24, 46,

47)

FM MODE qg (44)
FUNCTION wa (9, 11, 13, 15, 17,

18, 21, 25, 26, 31–39, 41, 46,
48, 53)

GROUP indicator 2 (18, 21, 22,

32–34)

MD insertion slot 5
MD NX 3 (15, 17, 18, 21, 25)

PHONES jack qk
PLAY MODE/DIRECTION qh

(9, 11, 13, 15, 17, 24, 30,
46–48)

REC MODE qd (26)
Remote sensor 6
REPEAT  qg (10, 16)
SYNCHRO MODE qd (22, 24,

46, 47)

TAPE  nN w; (46–48)
TUNER BAND ql (43, 44)
TUNING MODE qh (43, 44)
TUNING +/– 8 (44)
VOLUME +/– 0

?/1 (power) 1 (8, 20, 30, 43,

44, 50, 52)

Z PUSH OPEN/CLOSE 7 (46)
m/M 8 (10, 16, 37, 39, 43,

44, 46)

l/L 8 (10, 11, 13,

16–18, 26, 31, 33–38, 40, 41,
43)

x 

8 (10, 16, 21, 23–25, 29,

46–48)

Z MD 9 (15, 16, 20, 30)
Z CD qa (9, 10)
z MD qd (21, 25, 28, 40)
z TAPE qd (48)
X TAPE qf (46, 48)

5

2