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6

MD mechanism deck
(MDM-7B)

MD DIGITAL board

BD board

CN304

CN301

CN801

CN1001

MAIN board

CD mechanism deck
(CDM55F-K4BD43)

CN302

CN101

CN308

CN1

LOADING board

MAIN board

CD board

7

Tape mechanism deck

CN301

CN303

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-7B

9

BASS wd (40)
CD EJECT Z qh (8, 9, 16, 50)
CD x qj (9, 10, 17, 38)
CD u qk (9, 10)
DSG wh (40)
ENTER/START 5 (17, 18, 38,

39)

FUNCTION wf (9, 10, 13, 14, 19,

22, 23, 37, 39, 43)

MD EJECT Z ql (13, 24)
MD REC z qg (19, 22, 23)
MD u qd (13 – 15, 19)
MD x qf (13, 15, 17 – 20, 38,

39)

PHONES jack wa
PLAY MODE DIRECTION wj

(9, 10, 13 – 15, 24, 37 – 39)

PUSH OPEN/CLOSE Z 6 (37)
REC MODE 3 (20, 50)
Remote sensor 1
REPEAT 2 (9, 13, 34)
STEREO/MONO 2 (35)
SYNCHRO 4 (17, 18, 38)
TAPE REC z 0 (39)
TAPE Y 7 (37 –39)
TAPE x 8 (18, 37 – 39)
TAPE X 9 (37, 39)

1

2

5

8

6

3

4

7

wa

qj

qk

ql

w;

9

q;

qd

qf

qg

qa

qs

qh

wf

wh

wd

wg

wj

ws

TREBLE ws (40)
TUNER BAND qs (34, 35, 50)
TUNING MODE wj (34, 35)
TUNING –/+ qa (34, 35)
VOLUME w; (41)

. > qa (9, 10, 13 – 15)
m M qa (9, 13, 37)
@/1 (power) wg (7, 16, 24, 35, 41,

43, 50)