DOWNLOAD Sony BM-21 / BM-23 (serv.man3) Service Manual ↓ Size: 2.09 MB | Pages: 28 in PDF or view online for FREE

Model
BM-21 BM-23 (serv.man3)
Pages
28
Size
2.09 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio / SUPPLEMENT-2
File
bm-21-bm-23-sm3.pdf
Date
PREV: Sony BM-21 / BM-23 (serv.man2) Service Manual

Sony BM-21 / BM-23 (serv.man3) Service Manual ▷ View online

17
17
BM-21/23
BM-21/23
4-7. SCHEMATIC DIAGRAM  – LCD BOARD  –
•
 See page 10 for Waveform.    
•
 See page 19 for IC Pin Function Description.
R703
R704
R707
R705
R710
R706
R712
R713
R717
R718
R719
R720
R721
LCD701
IC701
R724
R725
R723
R726
R728
R729
R714
R734
R731
C704
C705
R722
R727
R701
R702
Q701
Q702
Q703
Q704
Q706
Q705
Q707
Q708
Q709
C703
R708
R709
R711
R715
R716
C701
C702
X701
R730
Q710
R736
S701
Q712
Q713
Q711
Q714
D702
Q715
D701
D703
D704
100k
100k
330k
150k
100k
330k
150k
330k
100k
100k
150k
330k
330k
BU2456-24
1M
1M
1M
1M
1M
1M
330k
100k
100k
0.015
0.015
1M
1M
470k
470k
2SD1819A-R-TX
2SB1218A-R-TX
2SD1819A-R-TX
2SD1819A-R-TX
2SD1819A-R-TX
2SB1218A-R-TX
2SD1819A-R-TX
2SB1218A-R-TX
2SD1819A-R-TX
0.033
470k
470k
100k
470k
470k
0.1
0.1
1MHz
100k
2SB1218A-R-TX
120k
UN5210-TX
UN5210-TX
UN5210-TX
UN5210-TX
RB425D-T146
UN5210-TX
RB425D-T146
GL8PR29
MA8051-TX
SUPPLEMENT-2
Page 15
(
(
SUPPLEMENT-2
Page 13
(
(
18
18
BM-21/23
BM-21/23
• IC Block Diagrams
IC102, IC103  MM3111AWLE
 — AUDIO Board —
1
BIAS
3
4
2
8
6
5
7
SHUTDOWN
BYPASS
+IN
-IN
VO2
GND
VDD
VO1
1
ROUT1
CO3
CO4
VCC
2
ROUT2
3
TC
4
ADJ
VCC
OP1
OP2
CO1
CO3
8 VCC
7 CF
6 RIPPLE
5 GND
IC502  MM1210-XFF
FC GND
VCC
VCC
FC
WB
VCC
NC
UOUT
VOUT
WOUT
P-GND
VB
UB
GND
TO
CONTROL
BLOCKS
TO
EACH
BLOCKS
N1
OUT
VSP
IN+
VREF
S/S
COM
OSC
7
5
4
3
1
2
6
8
9
10
11
12
13
14
15
16
18
20
19
STARTING
DETECT
POWER
SUPPLY
BIAS
OSCILLATING
CIRCUIT
SPEED CONTROL
REFERENCE VOLTAGE
REFERENCE
VOLTAGE
CURRENT
DETECT
SPEED
DETECT
WAVEFORM DETECT
COMMUTATION STARTING LOGIC
SOFT SWITCH
PRE DRIVER
+
–
17
IC601  LB1979VS-TLM-E
19
BM-21/23
• IC Pin Function Description
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
20
BM-21/23
SECTION  5
EXPLODED VIEWS
NOTE:
•
-XX and -X mean standardized parts, so they
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.
•
The mechanical parts with no reference
number in the exploded views are not supplied.
Ref. No.
Part No.
Description
Remark
Ref. No.
Part No.
Description
Remark
5-1.
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)
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
The components identified by mark 0  or
dotted line with mark 0 are critical for safety.
Replace only with part number specified.
Les composants identifiés par une marque 0
sont critiques pour la sécurité.
Ne les remplacer que par une pièce portant le
numéro spécifié.
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