Sharp MD-X7H Service Manual page 98

MD-X8H
SITUATION :
A
28 27 26 25 24
CNS1101
FLEXIBLE
PWB
28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10
B
C
MD OPTICIAL PICKUP UNIT
SW1952A
D
WRITE
PRO
SW1952B
DIRECT
SW1953
LEAD IN
SW1954
MD PLAY
E
SW1955
MD
RECORD
SW1956
LOADING
MD MECHANISM SWITCH
PWB-H
F
M901
MD
SPINDLE
G
MOTOR
M902
MD
SLED MOTOR
M903
MD
LOADING
MOTOR
H
• NOTES ON SCHEMATIC DIAGRAM can be found on page 31.
1
23 22 21 20 19 18 17 16 15 14 13 12 11 10
LDOUT
1 8
VCC
EXT.C
2 7
GND
3 6
L.DON
APC
4 5
LVV
L.DVAR
LEAD IN
R1902
1.8K
LOADING
R1901
470
R1904
820
+
M
–
+
M
–
+
M
–
2
Figure 62 SCHEMATIC DIAGRAM (17/20)
9 8 7 6 5 4 3 2 1
9 8 7 5 4 3 2 1
6
2
1
1
2 2
MAGNETIC
Q1251
HEAD
2SK2909
FW1901
LEAD IN
1
1
1
1
HINF
HINF
2
2
GND
GND
3
3
LOADING
4
4
MINF
MINF
5
5
5
5
15
SLD+
1 1 TP1607
SLD– TP1606
2
2
SP+
1
1 TP1608
SP– TP1609
2 2
TP1610
TRY+
1 1
TRY–
2
2
3 4
– 62 –
3
12
C1252
C1251
120P
(CH) 0.027
D D
G
Q1252
G
2SK2909
S S
D1252
SB0209CP
Q1254
2SK1473
D
D
G
G
Q1253
S
S
2SK1473
TP1605
TP1604
TP1602
TP1601
C1421 C1422
0.022 0.022
Q1601
2SA1314 C
C1610
10
R1617
R1609
47K
1.5K
R1612
56K
TRDRF
C1601
4.7
TRDRR
16
T– C1652
TN
820P
TP T+
FP F+
FN F–
R1652
10K
FODRR
FODRF
R1650
10K
C1631
5
L1251
47uH
R1223
680
T
EFMO
9 8
14 13 12 11 10
1 2 3 4 5 6 7
H
R1425
2.7K
LEAD IN
HINF
LOADING
MINF
TP1616
C1605
100/10
R1610
C1604
30K
56P(CH)
R1611
12K
REG+
1
REGB
+
2
–
IN1+ 1.25V
3
4
VBS1
Vm1
5
IN1–
6
OUT1
7
VM1–
8
9
VM1+
10
GND
11
VM2+
12
13
VM2–
14
OUT2
15
IN2–
16
IN2+
17 MUTE1
18 MUTE2
19 SS.GND
VREF
20
21
VREFO
IC160
1
M56758
5-CH MO
6