Pioneer MJ-L7 User manual

@~) PIONEER’
The Art of Entertainment
Service
Manual
MINIDISC RECORDER
MJ-L7
THIS MANUAL IS APPLICABLE TO THE FOLLOWING MODEL(S) AND TYPE(S).
ORDER NO.
RRV1848
Power
Requirement
Remarks
AC220-230V
AC230V
e These products are component of systems. This product does not operate normally by itself.
Please connect it to the STEREO CD RECEIVER XC-L7 and the DISPLAY UNIT DU-L7, an accessory
of the XC-L7, for adjustment and operation inspection.
CONTENTS
1.
SAFETY
INFORMATION...
ceeeseeeeseeseeeeees
2
7.
GENERAL
INFORMATION
.......c
ese
rereeeeees
47
2.
EXPLODED
VIEWS
AND
PARTS
LIST
.............
3
CAANG
aac
eiicn
nth
Satelite
47
3.
SCHEMATIC
DIAGRAM
.............0
eee
8
7.2
DIAGNOSIS
....
ee
eect
etter
tenes
50
4.
PCB
CONNECTION
DIAGRAM
........0....
ee
25
7.2.1
DISASSEMBLY
..........0
ee
50
5.;\PCB
PARTS
LIST
setts
cccvessecesveistensiereedacdeevsesens
32
7.2.2
TROUBLESHOOTING
.......
eee
53
6.
ADJUSTMENT
.......eeecececereeeeresseeeeeeeseeeseeenaees
35
7.3
BLOCK
DIAGRAM
.......
ce
eeeeeteeesteeeneteeeees
58
8. PANEL FACILITIES AND SPECIFICATIONS
evans dh bfacsSidd sce da hy octave date added aed eteatvecadeta st 60
PIONEER ELECTRONIC CORPORATION 4-1, Meguro 1-Chome, Meguro-ku, Tokyo 153, Japan
PIONEER ELECTRONICS SERVICE, INC. P.O. Box 1760, Long Beach, CA 90801-1760, U.S.A.
PIONEER ELECTRONIC (EUROPE) N.V. Haven 1087, Keetberglaan 1, 9120 Melsele, Belgium
PIONEER ELECTRONICS ASIACENTRE PTE. LTD. 501 Orchard Road, #10-00 Lane Crawford Place, Singapore 0923
©
PIONEER
ELECTRONIC
CORPORATION
1997
T-KZE
SEPT.
1997
Printed
in
Belgium

MJ-L7
1. SAFETY INFORMATION
LABEL CHECK
1.
Additional Laser Caution
Laser Interlock Mechanism
The position of the switch (SW1956) for detecting loading
state is detected by the MD mechanism microprocessor
(IC1401), and the design prevents laser diode oscillation
when the switch (SW1956) is OFF (Pin 6 of 1C1401 is high
level.). Thus, the interlock will no longer function if the
switch (SW1956) is deliberately set to ON. (Pin 6 of
101401 is low level.)
The interlock also does not function in the test mode*.
Laser diode oscillation will continue, if pin 20 of IR8R50
(IC1101) is connected to GND, or else the terminals
(between emitter and collector) of Q1101 are shorted to
each other.
. When the cover is opened with the shielding case of MD
mechanism assy (AYM7003) is further opened, close
viewing of the objective lens with the naked eye will cause
exposure to a Class 1 laser beam.
CLASS 1 ADVARSEL
* Refer to page 35 .
VORSICHT !
USYNLIG LASERTRALING VED UNSICHTBARE LASER-STRAHLUNG
LASER
P
RODUCT
ABNING
NAR
SIKKERHED
SAF-
TRITT
AUS,
WENN
DECKEL(ODER
ARW1046
BRYDERE ER UDE AF FUNKTION. KLAPPE)GEQFFNET IST! NICHT
UNDGA UDSATTELSE FOR DEM STRAHL AUSSETZEN!
STRALING.
VARO !
VARNING !
Avattaessa ja suojalukitus ohitetta- Osynlig laserstralning nar denna del
essa olet alttiina ndkymattimialle dr dppnad och sparen dr urkopplad.
lasersdteilylle. Ald katso séteeseen. Betrakta ej stralen.
ARW1047
MYXK type
CAUTION
INVISIBLE LASER RADIATION
WHEN OPEN, AVOID
EXPOSURE TO BEAM
ARW1050
NVXK type

2. EXPLODED VIEWS AND PARTS LIST
NOTES: @ Parts marked by “ NSP” are generally unavailable because they are not in our Master Spare Parts List.
@ The {\ mark found on some component parts indicates the importance of the safety factor of the part.
Therefore, when replacing, be sure to use parts of identical designation.
@ Screw adjacent to ¥ mark on the product are used for disassembly.
2.1 PACKING
(1) PACKING PARTS LIST
MJ-L7
Packing Case
Packing Sheet
(750 x 600 x 0.5)
Sub Packing
Operating Instructions
Fuse (T5A)
NVXK type only
(2) CONTRAST TABLE
MYXK and NVXK types are constructed the same except for the following:
Part No.
Symbol and Description
MYXK type NVXK type
ADG7010
ARE7135
ADG7009
Not used
AC Power Cord
Operating Instructions
(English /French /German /Italian)
Operating Instructions (English)
Packing Case
Sub Packing
Operating Instructions
(Dutch /Swedish /Spanish /Portuguese)
Fuse (T5A)
ARB7127
AHD7509
AHD7507
Not used
Not used
AHD7487
Not used
ARE7136
Not used AEK7001
Mark No. Description Parts No.
A AC Power Cord See Contrast table (2)
Operating Instructions See Contrast table (2)
Warranty Card ARY7010
Optical Fiber Cable (L=0.5m) RKX1031
Polyethylene Bag 221-038
(0.03 x 230 x 340)
Protect Sheet AEH7004
Pad MT AHA7176
Pad MTR AHA7195
See Contrast table (2)
223-007
See Contrast table (2)
See Contrast table (2)
See Contrast table (2)
Remarks

MJ-L7
6 "2.3 MD MECHANISM ASSY ".
Refer to
2.2 EXTERIOR
wv N
13 (1/2)

MJ-L7
(1) EXTERIOR PARTS LIST
Mark No. Description Parts No. Mark No. Description Parts No.
1 MD MAIN Assy AWZ8995 21. ~Bonnnet ANE7168
2 MD KEYB1 Assy AWZ8996 22 Screw BBZ30P080FMC:
3 MD KEYB2 Assy AWZ8997 23 «Screw BPZ30PO060FZK
4 Connection Cable ADE7015 24 Screw BPZ30P080FZK
A 5 Power Transformer ATT7024 25 Screw PMH20P080FMC
{AC220-230V)
26 Screw VBZ30P080FZK
6 MD Mechanism Assy AYM7003 NSP 27 Caution Label (F) ARW1046
T Leg AEB7090 NSP 28 Caution Label See Contrast table (2)
8 Leg (Front) AEB7102
9 Rear Panel See Contrast table (2)
NSP 10 Bottom Plate MT ANF7008
11. MD Backet ANG7152
NSP 12 Top Plate ANK7034
13 Button Assy AWL7026
14 MD Flap AAN7172
15 Black Line AAP7033
16 Sub Panel AAP7034
17 Flap Plate AAT7002
18 MD Spring ABH7154
19 Bottom Base MT AMA7004
NSP 20 Top Panel AMB7457
(2) CONTRAST TABLE
MYXK and NVXK types are constructed the same except for the following:
Part No.
Symbol and Description Remarks
MYXK type NVXK type
Rear Panel ANC7591 ANC7593
Caution Label ARW1047 ARW1050

MJ-L7
2.3 MD MECHANISM ASSY
SW1951A/B
01 5
MD MECHANISM
37
405

(1) MD MECHANISM ASSY PARTS LIST
MJ-L7
Mark
No.
Description
Parts
No.
Mark
No.
Description
Parts
No.
1 DRIVE GEAR
AZN7388
401 SHIELD CASE (TOP)
AZN7404
2
DRIVE
SCREW
AZB7071
402
HAED
CUSHION
AZN7405
3 LIGHT PICKUP ASSY
1246170009
403) a sscuene:
4 SHAFT SPRING
AZB7072
404 24P F.F.C
1245120149
5 DRIVE GRIP SPRING
AZB7073
405 SHIELD CASE (BOTTOM)
AZN7406
6 HEAD PLATE ASSY
AZN7389
406 FRAME
AZN7407
7 WASHER
AZB7104
407 RUBBER (A)
AZN7408
8 SCREW
AZB7083
408 RUBBER (B)
AZN7409
9 SCREW
AZB7084
409 4PSHEILD CABLE
1245120155
10 MD PICKUP GUIDE(A)
AZN7390
501 SCREW
AZB7094
11.
PICKUP
GUIDE
SHAFT(A)
AZN7391
502
SCREW
AZB7095
12 CAM PLATE ASSY
RZN1032
503 SCREW
AZB7122
13 RACK SPRING
AZB7074
14. RACK GEAR
AZN7393
M1951 MD SLIDE MOTOR ASSY AZX7028
15 WASHER
AZB7105
M1952 MD DISC MOTOR ASSY AZX7032
M1953 MD LOADING/HEAD
MOTOR = AZX7029
16 DRIVE PLATE ASSY
AZN7394
17.
H/ASHIFT
ARM
AZN7395
SW1951/SW1952_
PUSH
SWITCH
AZS7029
18 SHIFT/A SPRING
AZB7113
$W1953 SLIDE SWITCH
AZS7020
19
MD
GUIDE(B)
AZN7396
SW1954
PUSH
SWITCH
1245300021
20 PICK GUIDE SHAFT
AZN7397
SW1955 PUSH SWITCH
1245300021
SW1956 LEAF SWITCH
1245300020
21 SCREW
AZB7085
22 LOADING GEAR (A) AZN7398
PWB-A_ MD MAIN PCB ASSY
1246840174
23 LOADING GEAR SHAFT AZN7399
PWB-C1,C2_ MD MECHA SW/MO ASSY 1246840031
24 DRIVE SHAFT SPRING
AZB7114
25 SCREW
AZB7086
CW1901 5P CONNECTOR ASSY RZK1026
CW1902 5P CONNECTOR ASSY RZK1027
26
SCREW
AZB7087
CW1903
2P
CONNECTOR
ASSY
RZK1028
27. SCREW
AZB7088
28 LOADING GEAR(B)
AZN7400
29 ROLLER ARM ASSY
1242480073
30 WASHER
AZB7106
31 ROLLER SPRING
AZB7115
32 SCREW
AZB7089
33 CARTRIDGE HOLDERASSY
RZN1033
34 HOLDER ARM
AZN7403
35 SCREW
1249700107
36 HOLDER ARM SPRING
AZB7116
37 MAGNET HAED
AZP7010
BB eceeees
39 SCREW
RZB1003
40 DISK MOTOR SPRING
AZB7117
41 CLAMP
RZN1044
42 CATCH
RZN1045
43 CATCH SPRING
RZN1046
44 HEAD WIRE COVER
RZN1047
45 CUSHION
1243260047
46 EARTH TERMINAL
1245120126
100 MECHANICAL ASSY
RZN1041

;
MJ-L7
3. SCHEMATIC DIAGRAM
Note: When ordering service parts, be sure to refer to "EXPLODED VIEWS
AND PARTS LIST" or "PCB PARTS LIST".
3.1 OVERALL SCHEMATIC DIAGRAM
MD MECHANISM ASSY
(AYM7003: MYXK, NVXK types)
(AYM7001: XJ/JP type)
A (4 me | A-d MD MAIN PCB ASSY
(1246840174)
MD MECHA SW ASSY
(1246840031)
oe
MD
MECHA
MO
ASSY
(1246840031)
!
‘|
Large
size
SCH
diagram
m NOTES FOR SCHEMATIC DIAGRAMS
@ Resistance values unless otherwise specified are in Q.
"K" means 1000Q, and '"M" means 1000kQ.
Capacitors unless otherwise specified are in uF.
"P" is an abbreviation for pF.
For electrolytic capacitors, indication is in the order of
capacity and voltage resistance.
Parts indicated with the A\ mark (£2777 mark) are
important for safety reasons. Be sure to use the
designated parts for replacement in order to ensure
safety and performance.
Voltage value indicated in each part is without signal,
as measured with a digital multimeter.
The schematic and PCB diagrams are subject to
change for improved performance. Thus, they may be
slightly different, depending on the set.
Digital
\N
OPT IN
ees
GP1F32R
!
CN44@9
B4B-PH-K-S
Gy DIG OUT
Oy GNDD
S GNDD
@
DIG IN
VKN1 200
| CN4403
aah | '——lleleisteleielelelolelelo
—————————
|
CN4602
CN4603
D15A1@-@75-2468 D15A@9-075-2468
(09 ©9096 960608) ©000060056
009000008) 000000006
cN4902 CN4903
: Ey@ 22s
A le BE Tag ee a
NOON ai gce Blue Hie ie lie a ease ean
' AKP 7001
= 8 6OG&6GGCOQOOOOOOOOO
From STEREO CASSETTE DECK CT-L7

J4702 |
D2@PMWwOza5E
| MD KEYB1 ASSY
AWZ8996
A ) @ (| LEDPLAY MD KEYB2 ASSY
4 De ee @ @] Kev .N (AWZ8997)
Za
hoe
S
vor, F888
D7APNYA44 2F '
-——= {696 -——_ -—_-
- Menno
Y)
S3RKO4S-4 CN4604
AK77002
me
m4
PBL HS)
GNDA HB
PBR HD
GNDA K8)
RECR |()
GNDA Ki) Ls
RCCL
3)
$
GNDDMD (3) LO fo
-c- }@) 8 =
GNoP 3 i 3
-c- a
B) (Dy, zz) “ig 2 :
ano 18) 8
MD MAIN ASSY Eos. 6 C1) 2
(AWZ8995: MYXK, NVXK types) S. CATA 18)
{AWU7009: XJ/JP type) S. CLK (S: 1)
S. RFQ [4)
D. REQ (M) 13)
D. DATA (M) H@)
p. cl
K
(M)
KT)
1a
Spa 2s 25 2 UMP ype only
, | 5
A
os
sie : rea aa em ee
egos
AKP7005:
2
ee
z
1
ceo
L-
an
BA
Bev
Wes
eee
otto
he
Bi
20@mA
125V;
AKP1123:
a
¢ A XJ/IP type Beast A
1. : BA 125V ia} i
iGarar
\
ae
6
_——
ALK /a25 1 > eal AC Pe Cord J
enw
oe
duce
vexvone
Mere
ips
i 2.58 250V~
A_. CRAMP type Only) ADG7009: NVXK type
1 2.5A 250V~
ane 5 ADG7002: XJIP type
y
7A
125V~
A l
Ti Power Transformer 7 k .
{ATT7024: MYXK, NVXK types)
(ATT7023: XJ/JP type)
—

d
MJ-L7
3.2 MD MAIN PCB ASSY
Al MD MAIN PCB ASSY PWB-A
(1246840174)
SIGNAL ROUTE
™
:
PLAY
BACK
SIGNAL
>:
REC
SIGNAL
[C1101
IRSR50
RF PROCESS:
13 4
8) 4
HS?
an
tae
i]
ig E
_ LIGHT PICKUP ASSY (1246170009)
SWITCH POSITION IN CIRCUITRY DRAWING
No. Switch Name Position
SW1951 | Disc Protect OFF
$W1962 | Disc Media Detect OFF
SW1953 | Read In OFF
SW1954 | MD Playback OFF
SW1955 | MD Rec. OFF
swiese | Loading OFF
Bi MD MECHA SW ASSY
PWB-C1 (1246840031)
SIGNAL ROUTE
& : REC SIGNAL
iw
101251
TC74ACTO2F
HEAD DRIVER:
£35
cali ; ik
tt
swi05t
DISC PROTECT
AZS7029
swigsa,
READ IN
AZSTORS
Put
SW1056
MD PLAYBACK
+ 2a5309021
swiiess.
MO FEE.
seasaoceet
ee
[Smo mecua mo assy
PWB-C2 (1246840031)
1
7
DISG MEDIA we ve
DETECT
coe Cae
AZS7029
1
1
—s
a
101401
IX2645AF
MD SYSTEM MICROCOMPUTER
CONTROL
6
* \c1402 =
DISC MOTOR
AZx7032
1
10
z ow $29194A,
EE-PROM
wae.
Sad 11601
iss BAS996FP
AZXTCQG 5CH MOTOR DRIVER
2 = 3 4 |]

1¢1201
LR37646
ENCORDER/DECORDER
COMPRESSION
EXPAND
Ls!
IC 1602. IC 1603:
OP AMP
4 BIT D-RAM
IC1913
AVHCOBF
INVERTER
pan
bate
101701
TDA1309H
AID, D/A
CONVERTER
SIGNAL ROUTE
=: PLAY BACK SIGNAL
SIGNAL
: REC SI
>. OUTPUT DIGITAL AUDIO SIGNAL
m@ : INPUT DIGITAL AUDIO SIGNAL
SIGNAL ROUTE
™ : PLAY BACK SIGNAL
c>: REC SIGNAL
S OOOO o PPEOPRFITIO
ca i,
DOOOIOS
161803
NJM2804M
OP AMP
C1402 *"
291944
=-PROM
1c1802
NJM2403M
SWITCHING
REGULATOR,
ony
5
CN4409
CN4403

d
MJ-L7
= MD MAIN PCB ASSY (1/4)
SCHEMATIC DIAGRAM POSITION: [A-<A-]
12
A-a ERY
MD MAIN PCB ASSY PWB-A
(1246840174)
SIGNAL ROUTE
m : PLAY BACK SIGNAL
co : REC SIGNAL
AGAIN
AGAINS
BGAINS
BGAIN
FGAIN
FGAINS
EGAINS.
EGAIN
TBAL
TCGAIN
VREF
R1162
R1164
10K
tL _AvA— R1163
15K
[WF 22k
1.27V
=p ci142 |
C1143
}
1.27 v
€1140
2.2
AGAIN
R112.
120K
2
R123 6474
12K 121
R1128
12K
ae Leite
220K ps
R1135,
33K
T
K
@D VR1110
RFA
RFI
RFI2 3}
RFI3 ka
148V FIZ“ | 2
3.07v VCC2 Seqth1 al ix
RF3
RF2
ov
toev_Ar1234 {6 §——
VREFO
VREFC 1.55V
RFADD 1.25V
TCG 1.55V
TCGO 1.55V
TBAL 141V
EOUT 1.3V
EIN 1.55V
FIN 1.55V
FOUT 1.28V
BOUT
1.14V
BIN 1.55V
AIN 1.55V
AOUT 1.14v
rri2 (61
Q
a
z
to)
8
@
<
in
=
2
5
R
6
ov
148V 1.55V 155V
1C1101
IR3R50
RF PROCESS
TCGAV 0.14V GND1
R1140
1.71V 101101
2SB1424R
2.87
Ri
ANN
R1144
390
147 0.047
HFON
7
+3.15V (LASER)
oF
—
CNT101
Y026
DISC
IDVAR
1 DON

AGAIN 3
AGAINS
BGAINS
BGAIN
FGAIN
FGAINS
EGAINS
EGAIN
TBAL
TCGAIN
VREF
am
TP1112
1139 1138 R1161
s|
d
l
“the
a
FE
1.6V
5
0.1
10P
B
WIN
61137
9YTOTAL 2.17V
6800P
LOOOOOOOOO™
&
ae
Lona
ae
83828
8
5
z2
ang
a
GAINS:
11)
AGAINS
1.53V
.<
&
&
& & &
&
Seemy
1136
fia
we
¢
2)
AVCC
3.07
2
ee
a
cm
G3
owe
e &
8B
o
8
peeve
ee
I
AGND
OV
oe
os
a
RFBP1
0.47
|
>
c1i34
BGAINS BGAINS
1.53V
o65v
RFBP2
(61)
ae
Scat
BGAIN
153V
0.02255
|c1135
147V
ADI2
(G9)
=
pea
(LB)
GAIN
159V
0.022
FGAINS
sv
anier
ae
FGAINS
1.53V
on
C1133
EGAINS
1.53V
1101
ae
FS
:
a
--}——-6
BK
mn
154¥ ADO? C1132
‘R50
2
|
18a
TBAL
1.53V
'
1131
=
‘OCESS
Avot
(a3
330P
REF
VREF
1.59V
1130
146V
HPFO
NG
4}
RI158
-}
4
47K
wo
3300P
=
s
68K
Qa}
asyx
157V
(3) R159 47K
AWW: 25) ASY
1.57V =
g2 3
ro ZZ 3
TP1274
| @) &
3] 3] 2
el) ol) <
“
<i]
<i]
& oe 5
- im ft b> = =| oO
9
Z2le
£/5
G&G
So
ug
2
©le
ele
ee
ee
g
ae
IDDOOO@O®
> = 2
g) 8 Jaz] 8] & 3] &
were Gee |”
x 3
=H cree | >
arias
100K
HDON
«LASER?
LDVAR
TCG
13

;
MJ-L7
m MD MAIN PCB ASSY (2/4)
A-a EB
aq <q
al Sl
4] i 4
i
EFMO
a]
<i]
4
-
— 4
oe ¥ =
NF} es S,
ibs
5
guy
as
047 | & 3 =
S| = 2 = S| =| 2] =| =| at al =| zl sl zl el el ele =
ol 3} 3| 6 ele eed ese Ss} sl af 2] =] a] Pf 2] oF] 8 1.58V
QDOODOOO@DQOOOQOQOOOQOQOOQOO@OOO®D
Rise
nD x > wo od > fr Or KK ME “fif~K = LRCK a7.
PEEERREREEESS EEE SSB EGE EY
2|8 |
Gyre a] < 3 cpscix 75)
-@}vo01 cDLACK [74 =x [—>—_e
<@)oenn ov cppaTa {f3) =
4) wei 1.42V 8) A947 EXTCLK [72) aa
TCRS 0AV PLLOSC
eS
lal
aa
pr]
3
(8) aux PLLLR ® 5
2
3
te 1.56V 07 18D 63) 2 Reo 2
(8) Fe 1.6V ACRCER [6 8) eae
TOTAL 2.17V DOUT Né 7; 156V.
50) IC1201 > >
COV AGAIN. 153V pin A668 <a.
i) acains 1.58V LR37646 x10 (65)
sLDO
ae
Spry
ENCORDER/DECORDER
26)
x0
Bd
AGND
OV
DGND
63)
3
(HBAINS 159 COMPRESSION voor (63)
Ceca 1sav EXPAND 1) x700k0_{61) als
(8) roan 1.53 LSI cirvermo (69 &
-GFGAINS 1.53V sPDRR NSS)
(BJecamns 1.59v sporF 658) -
Ceca 159v SLDRR (G7) 1S nese AW
Cdl rBAL —1.59v © suorF (5+ a :
“GIy TCGAIN 157v TADAR {6 5)155¥ ress Work
GH vrer —1.50v tronr {6 4-1SY ;
FMI 1.38V Fopra (63}1% urge Wx +
GA asyx 4.879 Foorr [52)18Y ress Ware Bx
G3) asy z X176KO gj) 15 =” py 10K
ao * so
Mill.
28)
3
ges
PERERSEES
aa:
_ls
hat
ia
gee é 8ée¢e td cee eceze tee BGS 1650
=
OWVO® DOVQDOOOD@DOOOOG pes oe
al & 3 cee
a] 3 3 i ee DIGIN
a
at :
al 3 4 a3 q t
“
as 7 3.12V gee
e ¢ wet [ vee {fa} z
6 ov. 2 Ney 5 Oneus
Fd wey k {2-2
Es WG et Xt)
Fsw mol 151V
{sy ©
176.4K
wey
5]
(s)
2124
2 q Z| zl ov. GND {2} 1.56V. —p
3
3
3)
8]
8]
8
ia
1C1913
_& IOOOO 74VHCO8F
are 2 INVERTER
2 @g¢2 oul e| 4
Olst|
alN|a
i
nr
a
sale
S|
I
ON
al
x
F
58 waa oS « 8 I= ><a a} g |
\N\
3
@
«4
Sako
BS
role
al
ol
al
QAOOOH
OOOO®
ais
{Ip
¥
777737 27778
ad Mihea a ba Le os} of So ro
3
sa.
al
a S| sl] sl] of 5
q <j <j <J <
&
a
Ss Sy fis
=. oe,
z z| 4
236
33
anwe
14

1C1906
ed 3
Vee 2 oss
ts) 7s
s
GND
x“
is]
z
3
gq
a
bad
ANLPTR (36
=
TC7STO8F
R1967
R1969
ae C1958 We
ayy 0047
nN :
I
1
1
1
SPNO |
2 1
1
eat SLDO.
1C1602, 1C1603:
OP AMP '
eee |
= 1
Es
0
ee
CN4409
zt
me
'
1
=>
SIGNAL
ROUTE
|
m™ : PLAY BACK SIGNAL
:
c>: REC SIGNAL
>: OUTPUT
DIGITAL
AUDIO
SIGNAL
m> : INPUT DIGITAL
AUDIO
SIGNAL
wl
1
1
1
1
1
11964 aye

P
MJ-L7
m= MD MAIN PCB ASSY ee MD MECHA SW ASSY AND MD MECHA MO ASSY
4 es 2
| [| 2 a a ag
VV VV
SIGNAL ROUTE
>: REC SIGNAL
——_— ee 8 11251
SWITCH POSITION IN CIRCUITRY DRAWING Es var a
No. Switch Name Position om oe = é
SW1951 | Disc Protect OFF 8 = SE) 82 ie
SW1952 | Disc Media Detect OFF 2B ascent a | | Io eh
$W1953 | Read In OFF 3 7 ‘en .
$W1954 | MD Playback OFF 1 hic ¥: “* spozoecr| |S
SW1955 | MD Rec. OFF E
SW1956 | Loading OFF | D BS |g
IES ET A EEE = (a Q. = &
oii
:
ae
eee
MD MECHA SW ASSY 1 8 Ss a,
PWB-C1 (1246840031)
R1902
1
LEAD IN o LEAD IN 7 u
SW1951 HINE HINE
DISC PROTECT Oper T
AZS7029
®
ie
LOADING LOADING.
= MINF és MINE
Sw1952
DISC MEDIA cwi901 Biot + mS Fey
DETECT M924E N6437 M891E [Ss TE 2
AZS7029
i =
°
1
SW1953 1
READ
IN
Sle
MDRSW
sk
AZS7020
R1904
=
i
S
LD+
820 ' Lo—
SW1954
MD PLAYBACK 1
1245300021
Bi? 1601 = cro
1 by ese saan > ‘plow
Swi955 A608 GJ wie bee,
MD REC. yy Sa Ses
1245300021 ' as =
10K “ - ex
= 2 3 S-
bo ; a} 4| 2 nn
SW1956 a fee Be] sPNo © =
LOADING
1245300020
1
\
|
C1602
rn 1
t
ot
220P
b =] 58V 7 a a
oS ee eo he ee eo ay ye SPNO 4 7y a
— 4 @)
!
(@4
MD
MECHA
MO
ASSY
HY
Ht
PWB-C2 (1246840031 ae wail
ov FE]
(
)
5
6
G
;
LD~
ov
3
A
1901 L1901 Lot a 2 om ‘
- Ay I 7 Ft, 2
(My
=!
ri
Ley)
7
3
4 £
1 M1951 0 RI605go6v [.
SLIDE MOTOR i Hf g a
AZX7028
SEE
NG
i
Qe
wv
fs
=
;
crsne
uns
SLD
eA
;
gaz
2sey
TRY
=
a
feo
ule 0 sP+ B sP+ 3.12 SP—/TRY—
0.47 3 3 TE et
: (M)- } We SP—/TRY— 4 7 a SP—/TRY— 29V sP+ 9 J 7 “
M1952
by)
TRY+
XS
TRY+
29V
SLD+
DISC MOTOR cmon 1 @ wo ey >
AZX7032 NB436 Zev (<4 Loot
les
2
iS
1C1601
' L1905
M1953 . he BA6996FP
LOADING MOTOR
AZX7029 | 5CH MOTOR DRIVER

8
MJ-L7
1cG
VREF3.15V
R1401
MIRE
AM,
R1421
Hine 14040 1K DA204K 3.3K
WA
us It
|
L
7
t
L
R1223
=
D
(SB)
(3)
(8
o
+
DOOOODOODOO@AOOO®
©
t : = =
=
SESS
ee
eE
YSEEREHSES
See
2
238
$88
FR
BS
SER
aa
Sige
ae
EFMO.
=
a
oa
eg
(Te
oH
eY
SF
Ss
24
6
1.56V
>
FOF
a
S$
fat
<
3
g
So
fs
y
Be
gS
e
8
XRST
p55
88
#3
gs
8 8 §
5
zl
=
=
o 0
>
o
86
8
8
DIGCD
oy
=
o
oO
os
1.56V
#
DIGEX
OOO
5
a
LOW
REFLECTION
DISC
:
1V
DFS!
HIGH REFLECTION DISC : 2.17V
1C1251
TC74ACT02F
HEAD DRIVER
BYTE ov
CNVSS OV
ANLPTR
LDON
HDON
XC
IN
FONT!
o
4
XC
OUT
PCNTO
Cam
Q
RESET
3.13V
1C1401
3.13V
DISC
69)
5
g
IX2645AF
tego)
x
BS
ae
VSS
ov
67)
SF
78x
see
way
MD
SYSTEM
MICROCOMPUTER
5
LEAD
I
vec
3.19v
CONTROL
6)
2.
HINF
&
3.13V
64
il
Bei
lea
@
*
LOADING
DSENSE
ov
grav
veo
(62)
a
MINE
a
STD
ov
3.13V
EEPK
[61)
ae
SERCH
ov
ov
EEPD
{6}
\
MDRSW
3.11V
aasv
epcs
[69)
ayo
FSWI
3.19V
ov
EEPRO
(68)-——
FSW2
3.19V
62
P—DOWN
3.13V
5
(68)
MORSW
a
2
HDON
3.19v
§
65)
LD+
=
x
4
oa
syspo
(64)
sy
2
&
sysp1
(3°
SY
z
aan
»
2
EB
Be
sysn2
69°*
sy
a
>
2
>
5
aS
o 9
ny
un
6 &
ao
6 o
SYSD3
(6)
SY
4
ee
3%
252228888
;
=
3%
3 3
&
& & &
sysps
ui
DOOO@MO®
o|
2
Fd
S|
§
:
z
=
5
=
x“
el
2!
S|
al
el 3)
a
al)
Oo
>|
>
Sl
>
el]
S|
R1620
i
&|
2
al a]
al
al
al
al
&
AMY
SPNO
a
100
=
ey
©1602
R1615
el
337
5
2
238
——@
is-
:
159)
1.55V
=
we
=
+
be
VREF
1.55V
4
ute
rs
1401
Q1402
zi
¢
RND404
RNC1404
g
(5)
SLDO_
155V
SLD
a)
slg
ca
tsey
TEO
R1621
éT¢
=
5D
AMY
TEO
1
il
7
TEOS
108
zy
V
eX
oF
C1601
=s3s
1404
7
a
T
a
zy=
Giioaea
RNC1404
—
ba
=
1C1402
=
FEO
(i9)
issy_FEO
ON
FEO
$29194A
aye
FP_271V
ay
EE-PROM
*
IS
+
25°
_
ey
23s
oe]
16FP
4
3
DRIVER
17
7
5 6
=
7
=

d
MJ-L7
m= MD MAIN PCB ASSY (4/4)
g ger gg
gs8
a3
VREF3.15V
MODEO
ADENB OV 3.15V(A.REC) 4
IC1701
VSSA—AD
eae TDA1309H
VAN A/D, D/A
vR
CONVERTEF
—
VRP
> > eee =
£5 & & § Se
3 ou Boa
:
2
2gkas
:
:
DOOOOOSH
GD
ov
Ed
s
0
eth
|
a
"
DAPON
DAPON
C1704
8
N75)
—
5
; 5 ADPON ADPON 180P
"
1708
R1703
R
>
10K
vB
LDON
‘6
j
b —|— — : ‘i i?
AA. aaa
0
(70)
.
7
a
3.16V
AA.GND
|
tose
ET].
Qo
L
Poe
®)
es
C2712GR
SF
%
58
S=
-
38v
cm
=
=
Is a
e = en lot €1730 Pusey
Roo —
&
=
=
Sg
5S
iD
“tl
bp
C1706
2274
6)
|8
Ag
GND
AA.GND
“
_
s
5
rT)
Tt
a
UCON3.15V
BUCKUP
atieke
i R1476 |
xc 63-"* _4 i
* RGN :
>
D
D (69 \
28
aie
=e
30 (6) ba
2
1807
(65
01820
L1g02
B1424R
h
k3
|
VREF3.15V
oau
ai
{|
oo
6)
D0
2SA1162GR
E
o Ls
D1
o4V__
SYD1
es
zs
3
g
pe
(E25
D
Ss
x
=
a
6
|
Bs
pa
(gv
—_sv03
a1s21
&
g
ote
a
() 95 2=
_4|
RNC1404
ee,
2
act
S38
oO
Sa
=> Oo
=
2
R1830
>
Rises | &
ae
S
5ST
3
[p1332
Q1822
aE
_
Wee
=
Rigo
Lea
1
ies
R1I719
=
R1833
-é)
RNC1404
me
1.8K
SV
9
AAA
—¢
1
2
“
R1834
= a 1
a
a
=
Tray
if
$F
ese
1424R
iL
61828
225
==
2700P
=
pis3e
e
=
100
&
I
Fe
x||
3
01804
VREF
9R1B2
IC1801
HA16114FP
a)
a
RNC
1404
$a
ae
aesv
KR
ov
rev SYNC = LVN sane
a
2
R1859
1841
iC
aes
wo)
we}
as
a=s
3)
AT
1.65v
pe
{74}
ie
“
SDSS
39K
OK
=
1C1802
|,
aa
{4}
ct
125v
on/OFF
(3/252
a
hk
2
1836
_
aoe
errs
NJM2403M
+
cia
hia
=
(IN
2sv
TM
Qf
2)
ol
BYE/O
13V
ci-
fr)
Sere ~ 257) IN+ VIN {70} *
(oy 5
3
+
ce
elo
SWITCHING
a
ae
REGULATOR
SL.
1k
Q1810
R1843
24aVv
R1856 R1857
aT
on
150K
L
ak
=
Rigo?
c2712GR
7m
S-
832
1x
2
+
i808
3
T
Sa
ov "c27126R So a
18

a 5 | 6 Lt 7 = 8
MJ-L7
SCHEMATIC DIAGRAM POSITION:
> [Ac EY
apes
Pgs
25
$
Sx
|
TC7ST08F
|
<
Eye
.
1967
I
R1969
ae
1
vssp (j34-&%
DAWS Gaps
DABCK 43 7)1-87¥ Hipes Q) REF
C1984 «1.5K
DADEN {392%
DAPON 69 ey Ee VDDA '
R1721 =
C1701 VoODD—AD/DA Gaye Od AMPI
1
vssp-AD/DA
(27)
3
AMES.
a
$
1A1309H VSSA—DA oy SCIZ8 rs = VSSA
Saas 2E
/D,
D/A
VDDA—DA
2
=
als
F
:
AS
vouTR }52)1:58¥ .z) 8
\VERTER 2am 2]:
DACR
2
nS
1C1907
TC9246F
oa
oO
b l
>
©)
101914
|
>
fa
TC7SHO8F
3s
1
SIGNAL ROUTE
a m : PLAY BACK SIGNAL
Ss > : REC SIGNAL
Bs
l
AA.GND
B
Sy
2
we
|
ef
5
s
i]
s
me
BUCKUP
01704 01703
|
R1738
62k
@
'
Liaw—
>
R1743 RN2404 RNC1404
To1705
27k
ics
101704
+
2
Fe
GND
cas
GND
Q Lore R1742 ©
fot") 5 2's ay —G
rr =
1G Van aaa Vv 2) Sa
4.7M
vec
Rs
R1947
R1948
BUCKUP
TCAS6BF
+
°
AW
8
eae
47
4
a0
g a ceo
te
8
7
=
2k
'
apes PDOWN |
ANN L
K = '
R1456 Ss
LOADIN
872
ll
1K es
RESET (1) ppown
Ss
1451
@)
RAMI0K
RNC 1407 er
LOAD SW
€) R452 3.3K @
LY) ese
STID
i
net
*
A
MD—ST
R1458 6.8K
E in72s 3 r— 1 Triaso “Sex Cops
| P.GND Ess SERCH : @)| sence
> zys i R1462 6.8K
2 KDATA ns KDATA
R1464 220
seh
DAT
MDDATA
|
I)
movara
4FP | Ri466 220
DsTB AM bere
5 R147
25
2K
ob
G0)
o.cno
[)
©
& fia 01803 01805 D1703 @) DIGND
ce are RN2407 RNC 1404 4: J 3) D.GND CN4403
2 52V Wy KDS160 ©1904 D.GND
S.
27K
0.33
L1950
JuH
o
Diov.
o
EO.
;
AV SF 23x & D.10V
& = eee lf 1460 LR190 are
SSx
ae ie =f I! P1995 a De, @yatev
285
+t
AW
*
&
LIN
oO
R1994 gicky
¢- RIN
1731 vo pogo
= P.GND sae R1731 ‘
229 OUT
we
PCNTI
23}
AA.GND
24)
R
OUT
ee ~Tonig02
MZE24
0
19
a 5 = 6 = 7 = 8

MJ-L7
= MD WAVEFORMS
EFM
(PLAYBACK
DISC)
PLAY
MODISC
(NORMAL
PLAY)
SRORM 100M Sis
Stopped
CC
oMia.
a
Sey
[Setew
|b
[Bet
|
pew
Pm Filter =)
‘SMOOTH ON
t
BW
FULL
ho
ee
dee
eh
en
ef
oe
pay
be
preg
Lae
eee
peer
P™ Olisct =)
bo
CHI 0.0000V
CH2 — 0.000V
CH3
—0.000V
(5)
i
CHA 0.000V
P
Record
Len®]
t
MAIN: 500
+
ZOOM: 20
P™ Delay)
t
ie
0.000
000
600
s
BR Hold Of)
MIN
B= Tigger=)
‘AUTO
EDGE
CHI
Vit) 2.470V
vali) 470.0mv
Avit) 2.000v
—> >.
EFM
(MO
DISC)
PLAY
RESET
(Standby->PLAY—
Standby)
Stopped
Stopped
NORM 100M Sis
NORM 5k Sis
2
apes
as
ay ea pes
apr
— =
=
=
=
Filter
=)
WE FE
ook)
Peel
ed
a
fe
=
Filter
—)
7
‘
SMOOTH
ON
fooled
ce
al
td
SMOOTH
ON
BW
FULL
|
ae
ne
rserent|
BW
FULL
PP
Offset
=)
P=
Offset
=]
CH1
0.0000V
at
eee
ilar tere
|
cHi
o.o0ov
CH2
0.000V
CH2
2.0000V
CH3
0,000V
CHa”
<0.000V:
CH4
—0.000¥
-
Ha
'0
GOO:
Record
Len®]
ae
P
Record
Len™]
MAIN:
500
++
+
a
TH+
MAIN:
10K
ZOOM:
20
ZOOM:
500
t
P™
Delay
==)
P™
Delay==)
ro
+
0,000
000
000
s
oF
+
p00
PHold
OFF
PE
Hold
O18"
+
MIN MIN
P=
Trigger
[eae
who
Peek
caic
oP
fic)
P=
Trigger
AUTO
ie
AUTO
t
EDGE
‘
EDGE
CHI CHI
t
Vithy 2210¥
Vigty 2,000¥
0.0m
Vi 960.0mV_
Avi} 1.7600
Vit} 1.040
PLAYBACK
MD
—
PLAY
POWER
SUPPLY
OFF
Standby
Stopped
‘Stopped
NORM
50M
Sis
NORM
1k
Si
a
faa
ah foetd ¢ fReay feed | om
Filter
=
|
2:1)
Fite
—
‘SMOOTH
ON
a
SMOOTH
ON
y\
el
Wa
A
BW
FULL
BW
FULL
P=
Oitset
=
Oa
at
=
Ofisctma
a“
ony
9.00
|
a
URE)
Mi
CHi
—
0.000V
Hz
H
CH2
—0.000V
i
CH3
0.000V
bh
ll
‘yall
is
CHS
0.000V
i
CH4
0,000V
u
CH4
—
0.000V
Record
Len®)
Record
Len®]
ciel
aie
Gel
BR]
bat
aaa
Died
baad
Wed
eee
MAIN:
10K
MAIN:
10K
ZOOM:
500
ZOOM:
500
P=
Delay==)
P=
Delayam
f}r
<oponaos
a
0.008
PR
Hold
Of
=)
BE
Hold
Of
ag
MIN
MIN
t
B=
Tigger
=)
=
Trigger
‘AUTO
AUTO
EDGE
}
EDGE
H
cHt
{
|
cH
PLAY
(MO
DISC)
PLAY
(MO
DISC)
Stopped
‘Stopped
NORM
50M
Sis
NORM
200
Sis
ot
Bao
zonsi
at
Ber
|
a=
aa
Pe
Filter
=)
B=
Filter
=
=F
SMOOTH
ON
yee
pt
ae
af
-P>P
>
7747
A]
SMOOTH
ON
8W
FULL
BW
FULL
B=
Offset
=)
P=
Offset
==”)
CHi
0.000¥
CHi
1.590V
CH2
—
0.000V
CH2
2.7050V
CH3—0.000¥
CH3
2.585V
1
CHa
0.000V
CH4
—
0.000V
B
Record
Len@]
Record
Len®]
MAIN:
10K
MAIN:
10K
ZOOM:
500
ZOOM:
400
P@™
Delay)
P=
Delay
=m)
0.000
000
0s
0.00s
BE
Hold
Of)
BP
Hold
Of
=)
2E
MIN
MIN
BP
Tigger=)
P=
Trigger)
AUTO
‘AUTO
EDGE
EDGE
on cH
vith) 2000¥
va(1) 980.0mv
AVG) 1.0404
PLAY (MO DISC
PLAY
(RECORDBLE
MD
MO
DISC)
er
( )
‘Stopped
NORM
200
Sis
SH1 =2 = SHS =
=
b,
L ot CH2
Fey fey
wy
BeBe
[BEA
BEET
[Be
|
obe
way
RES
|
Bae]
BN]
4
oy
= Fite =
SMOOTH ON
BW FULL
=
Offset
=]
’
CHI _1590V
CH2 2.7050V
CH3 2.5850V
CH4 = 1.5700V
Record Len®]
an sneatsnsnoi}
2
MAIN: 10K
ZOOM: 400
r
F
P=
Delay==)
:
000s
Pm Hold Of =]
Ho:
MIN
le
[aioe
[ote
[ooo
ae
pecoicy
ci
Fm
Tigger
ae
ee
| AUTO
|
A
EDGE
CHI
‘
20