© 2001-7 PRINTED IN JAPAN
B51-8586-00 (N) 167
RAPID CHARGER
BC-20
SERVICE MANUAL
CIRCUIT DESCRIPTION ........................................................................... 2
PARTS LIST .............................................................................................. 2
EXPLODED VIEW ..................................................................................... 2
PC BOARD VIEWS ................................................................................... 3
CIRCUIT DIAGRAM .................................................................................. 4
PB-40 (Ni-MH : Standard Battery Pack) ................................................ 5
PB-41 (Ni-MH : Long
Life Battery Pack)................................................. 5
SPECIFICATIONS ..................................................................................... 5
CONTENTS
Cabinet (Top)
(A02-3624-08)
Badge
(B43-1137-08)
Relay terminal
(E23-1181-08) x 4
AC adapter
(W08-0924-05)
2
BC-20
Power on
Initialization
Are
output terminals
shorted?
Battery insert
Is the
battery abnormal?
(Shorted)
No contact of
T terminal?
Fast charge
(LED color : Red)
Trickle charge
(LED color : Green)
Red LED flash
Abnormal
reset?
Is
V
effect?
t
Is T > 50
°C?
Timer < 4 hours?
Timer < 6 hours
Charging current 2mA
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
No
No
V
= 48mV/2.5min
t
(Sense 128 times)
Cabinet (Top)
(A02-3624-08)
Badge
(B43-1137-08)
DC jack
(E03-0198-08)
Relay terminal
(E23-1181-08) x 4
Charger unit
(W02-3621-08)
Cabinet (Bottom)
(A02-3625-08)
Cushion
(G13-1864-08) x 2
700 x 4
CIRCUIT DESCRIPTION / PARTS LIST / EXPLODED VIEW
Circuit Description
s Charger Flow Chart
Parts List
: New Parts
Ref No.
New
Parts No.
Description
parts
A02-3624-08
Cabinet
Top
A02-3625-08
Cabinet
Bottom
B43-1137-08
Badge
B62-1461-00
Instruction manual
ENG, FRA
B62-1568-00
Instruction manual
SPA, GER
B62-1569-00
Instruction manual
ITA, DUT
E03-0198-08
DC jack
E23-1181-08
Relay terminal
G13-1864-08
Cushion
W02-3621-08
Charger unit
W08-0924-05
AC adapter
AC 230V, 50Hz
Exploded View
3
BC-20
JACK
D1
D2
D3
D9
D7
D6
C7
D4
D5
U2
1
14
15
28
R10
R18
R4
R3
R24
C10
U1
I
O G
R37
JK14
C1
+
Q2
B
E
C
R9
R36
JK2
JK3
JK10
JK6
R45
JK8
JK7
JK9
R23
JK13
JK12
U4
JK11
JK4
JK5
C6
L1
C2
D8
+
+
+
+
+
T
LED1
R
G
1
78
14
R8
R38
R20
Q6
C8
Q4
Q1
R30
R35
R43
R39
C13
C11
Q5
R42
R14
R21
R12
R11
R32
R40
R25
R41
R44
R34
R31
R19
R22
R1
R2
Q3
R15
R5
R6
C9
R28
R27
R29
R26
C12
R33
R13
U3
1
7
8
14
C4
C5
R7
R16
R17
C3
J01
PC BOARD VIEWS
CHARGER UNIT (W02-3621-08)
Component side view
CHARGER UNIT (W02-3621-08)
Foil side view
4
BC-20
CIRCUIT DIAGRAMS
D1
R37
200
R38
R16
47K
R1
100K
15
8
4
2
27
24
25
5
9
7
16
17
26
Q1
D8
U4
8
6
1
Mode
Vcc
B
A
QSEL
MR
2
3
C4
0.1
C10
1
50V
R7
3.3K
R40
240K
R41
470K
C1
100
25V
C2
100
16V
R8
200
R9
680
C6
47P
R14
100K
R15
3.9K
R36
0.12
R42
1K
C7
10
25V
R11
200K
D7
D6
D4
C8
0.1
C9
1
C13
0.1
C12
0.1
R21
36K
R23
1K
R31
10K
R25
10K
R28
4.3K
R29
47K
R24
1K
R26
47K
R27
12K
R33
4.3K
R34
4.3K
R35
4.12K
R32
200K
R22
47K
R43
10K
R12
20K
D2
C3
0.1
R2
18.2K
R3
47K
R45
10K
R4
47K
R5
680
C5
33P
R6
680
JK1
1
2
VI
VO
U1
U2
Vcc
Vcc
Vcc
Vcc
Vcc
Vcc
Vcc
Vcc
Vcc
Vcc
Vcc
Vcc
Vcc
28
1
3
CHA
CHB
BA
TB
AI
/DISCB
ST
AR
TA
C
ALARM
CHANGE
AIA
V
MODE
/INUSE
TYPEB
AV
B
T
18
6
12
13
10
11
23
Q
R
RT
C
CTC
RS
22
10
14
13
12
9
5
7
20
21
19
14
VDD
V
AREF
TYPEA
/RESET
XIN
XOUT
V
ASS
VSS
/LED
L1
/BUZZ
/BF
AST
/BFULL
/AF
A
ST
/AFULL
KD43C
LED1
(G)
(R)
Q4
Q2
L1
R10
4.7K
R13
430
R18
1K
13
10
11
+
U3D
D9
D3
Q3
CON1
1
2
3
R19
10K
R20
51K
D5
PWR
Q5
Q6
R39
20K
U3A
U3C
U3B
2
12
14
4
8
9
5
67
1
3
+
+
+
+
+
+
+
510
R17
47K
R44
10K
R30
10K
U1
:
LM78L05
U2
:
CG602L
U3
:
LM339
U4
:
HEF4541
Q1,4,6
:2SA1015
Q2
:2SA1757
Q3,5
:2SC945
D1,3
:
1N4002
D2
:
1N5819
D4~9
:
1N4148
LED1
:
L
T03062-DT
-D063
5
BC-20
PB-40 (Ni-MH : Standard Battery Pack) /
PB-41 (Ni-MH : Long Life Battery Pack) / SPECIFICATIONS
PB-40
s External View
PB-41
s External View
s Specifications
Voltage ...................................... 7.2V
Battery capacity ........................ 600mAh
Charging time ............................ Approx. 60 minutes
s Specifications
Voltage ...................................... 7.2V
Battery capacity ........................ 1000mAh
Charging time ............................ Approx. 100 minutes
Specifications
Dimensions (W x H x D) ....... Appox. 95 x 46 x 126 mm
Weight (Charger only) ........... Apptox. 126g