Sony BM-23MK2 Service Manual ▷ View online
21
BM-23MK2
• IC Pin Function Description
LCD BOARD IC701 SYSTEM CONTROLLER (BU2456-24)
LCD BOARD IC701 SYSTEM CONTROLLER (BU2456-24)
Pin No.
Pin Name
I/O
Description
1
INT
I
Reset terminal
2
GND
—
GND terminal
3
POWER
I
1. When POWER IN becomes level “L”, UP counter, BATT, or LTR is displayed
according to PHOTO IN change.
2. When POWER IN becomes level “H”, the HALT state is set, displaying is stopped,
and the detection of all inputs are also stopped.
4
IN CTL
O
Rc/Rd input control terminal
5
COM1
O
COM 1 First digit (first digit from the right)
6
COM2
O
COM 2 Second digit (second digit from the right)
7
BATT1 (RESET)
I
BATT IN
1. When BATT1=H, and BATT2=L, “u” is displayed.
2. When BATT1=H, and BATT2=L, “y” is displayed.
3. When BATT1=H, and BATT2=L, “t” is displayed.
4. When BATT1=H, and BATT2=L, “e” is displayed.
5. BATT IN will not be accepted during HALT.
RESET IN
8
BATT2 (LTR)
I
1. Forces the counter to display “
888” while it is displaying.
2. Set the RAM of the counter to display “
888” while the LTR is displayed.
3. RESET IN will not be accepted during HALT.
LTR IN
1. The counter is stopped if it is displaying and “L” is displayed.
2. Even if “L” is displayed, the counter will operate.
3. LTR IN will not be accepted during HALT.
9
PHOTO
I
1. When the tape is rotated while the tape recorder is operating, photo detection is input.
2. PHOTO IN will not be accepted during HALT.
10
BS
I
1. The DOWN counter is set when L and the UP counter is set when H.
2. BS IN will not be accepted during HALT.
11
SEG8
O
Segment output terminal
12
NC
—
13
NC
—
14
SEG1
O
Segment output terminal
15
SEG2
O
Segment output terminal
16
SEG3
O
Segment output terminal
17
SEG4
O
Segment output terminal
18
SEG5
O
Segment output terminal
19
SEG6
O
Segment output terminal
20
SEG7
O
Segment output terminal
21
COM3
O
COM 3 Third digit (third digit from the right)
22
OSC
O
X’tal oscillation terminal (1MHz)
23
OSC
I
X’tal oscillation terminal (1MHz)
24
VCC
—
Power supply terminal
22
BM-23MK2
SECTION 7
EXPLODED VIEWS
NOTE:
•
-XX and -X mean standardized parts, so they
may have some difference from the original
one.
may have some difference from the original
one.
•
Items marked “*” are not stocked since they
are seldom required for routine service.
Some delay should be anticipated when
ordering these items.
are seldom required for routine service.
Some delay should be anticipated when
ordering these items.
•
The mechanical parts with no reference
number in the exploded views are not supplied.
number in the exploded views are not supplied.
Ref. No.
Part No.
Description
Remark
Ref. No.
Part No.
Description
Remark
7-1.
CABINET SECTION
1
3-704-197-03 SCREW (M1.4X1.6), LOCKING
2
X-3367-817-1 PANEL ASSY, CASSETTE
3
3-704-197-42 SCREW (M1.4X2.2), LOCKING
4
X-3367-810-1 PANEL ASSY, HOLDER
5
3-831-441-11 CUSHION, CABINET UPPER 10X7X0.5
* 6
3-374-741-01 BRACKET (SPEAKER), CONCLUDE
7
3-909-973-01 PANEL, CONTROL
8
X-3367-812-1 BUTTON ASSY, CONTROL
9
3-909-955-01 KNOB (HOLD)
10
3-909-954-01 KNOB (A)
11
X-3367-816-1 CABINET (REAR) ASSY
12
3-909-957-01 KNOB (VOR)
13
3-366-890-51 SCREW (M1.4X6.0)
14
3-318-203-98 SCREW (B1.7X11), TAPPING
15
3-365-623-01 KNOB (DOLBY)
16
3-347-746-11 COLLAR
17
3-365-630-02 SCREW (M1.4)
18
4-017-441-01 CUSHION (B)
19
3-915-246-01 CUSHION
20
3-909-956-01 BUTTON (E-IND)
SP901
1-504-691-13 SPEAKER (3.6cm)
The components identified by mark 0 or
dotted line with mark 0 are critical for safety.
Replace only with part number specified.
dotted line with mark 0 are critical for safety.
Replace only with part number specified.
2
1
3
4
5
1
6
15
14
13
12
11
18
19
20
18
10
9
17
8
16
7
chassis section
SP901
5
23
BM-23MK2
Ref. No.
Part No.
Description
Remark
Ref. No.
Part No.
Description
Remark
51
3-831-441-11 CUSHION, CABINET UPPER 10X7X0.5
52
3-345-648-81 SCREW (M1.4X3)
53
3-703-502-01 SCREW
54
3-375-114-61 SCREW
55
A-1138-332-A AUDIO BOARD, COMPLETE
56
3-909-950-01 SPRING, BATTERY COIL
57
X-3367-811-1 TERMINAL BOARD ASSY
* 58
X-3363-574-1 HOLDER ASSY, JACK
59
3-909-952-01 BUTTON (EJECT)
60
3-909-951-01 BUTTON (FF)
61
3-909-953-01 LID, BATTERY CASE
62
3-320-975-01 CUSHION (A), MICROPHONE
63
1-652-024-11 PC BOARD, FLEXIBLE
64
A-1139-877-A LCD BOARD, COMPLETE
65
X-3367-814-1 PLATE, LOCK ASSY
66
X-3367-813-1 CABINET (FRONT) ASSY
67
3-704-197-33 SCREW (M1.4X3.0), LOCKING
68
3-371-862-01 PLATE, ORNAMENTAL
* 70
1-537-724-11 CONDUCTIVE BOARD, CONNECTION
71
3-911-887-01 HOLDER, LCD
72
7-623-505-01 LUG, 2
73
3-891-132-00 SCREW (M1.7X2.0), SPECIAL HEAD
74
4-017-441-01 CUSHION (B)
* 75
3-914-611-01 HOLDER, MICROPHONE
LCD701 1-810-464-11 DISPLAY PANEL, LIQUID CRYSTAL
MIC901 1-542-080-11 MICROPHONE, BUILT-IN
7-2.
CHASSIS SECTION
54
74
58
59
57
60
62
75
65
72
73
66
67
67
68
63
71
61
56
54
52
53
51
51
51
55
not supplied
LCD701
MIC901
mechanism deck section-1
(MB-23MK2-101)
(MB-23MK2-101)
54
64
70
24
BM-23MK2
Ref. No.
Part No.
Description
Remark
Ref. No.
Part No.
Description
Remark
101
3-375-135-02 SCREW (1.4), SPECIAL
102
3-376-177-02 SCREW (M1.4X3.8)
103
3-371-882-01 SPRING (AZIMUTH), COMPRESSION
104
3-375-045-01 COLLAR (HEAD)
106
3-371-851-06 BRACKET (E HEAD)
107
3-704-197-11 SCREW (M1.4X2.0), LOCKING
108
3-023-711-01 SPRING (E HEAD), TORSION
109
3-371-839-11 BRACKET (HEAD)
110
3-321-483-11 RING, RETAINING
111
3-910-002-01 SPRING, TENSION
112
3-371-854-01 GEAR (FF)
113
3-371-886-02 SCREW (MOTOR), STEP
114
X-3363-573-1 PINCH ROLLER ASSY
116
3-924-682-01 BELT (FR)
117
3-701-437-51 WASHER
118
X-3369-923-1 WHEEL ASSY (ZNDC), CAPSTAN
119
3-371-822-01 SPRING (PINCH LEVER), TORSION
* 120
3-371-885-01 CUSHION, MOTOR
121
3-831-441-11 CUSHION, CABINET UPPER 10X7X0.5
123
3-371-869-01 BELT (CAPSTAN)
124
X-3367-821-2 CHASSIS (HEAD) ASSY
125
3-234-449-05 SCREW (M1.4)
126
3-374-119-02 SPRING (GROUND), TORSION
HRP901 1-500-126-12 HEAD, MAGNETIC (RECORD/PLAYBACK)
M901
M901
1-698-452-14 MOTOR, DC
HE901
1-543-876-11 HEAD (ERASE)
7-3.
MECHANISM DECK SECTION-1 (MB-23MK2-101)
102
101
104
109
110
110
124
111
112
113
110
119
117
120
123
121
HE901
M901
HRP901
mechanism deck section-2
(MB-23MK2-101)
(MB-23MK2-101)
114
116
118
106
108
103
107
not supplied
not
supplied
not
supplied
126
125
Click on the first or last page to see other BM-23MK2 service manuals if exist.