Kenwood KSC-24 User Manual
RAPID CHARGER
KSC-24
SERVICE MANUAL
AC adapter
(W08-0523-15) : K
(W08-0524-15) : E
(W08-0939-05) : T
© 2001-5 PRINTED IN JAPAN
B51-8583-00 (N) 1775
Relay terminal
(E23-1058-08) x 4
Cabinet (Upper)
(A02-3626-08)
Circuit Description
■ Power Supply Section
1. The power supply generates constant current (1.1A)
from the input voltage (rated 15V DC) from the adapter.
2. IC101 is a DC/DC converter.
3. R117 is a resistor for current detection.
4. R110 and R111 are resistors for no-load voltage detection (non-load voltage : 14V).
5. IC201 is a power supply/reset IC for the microcomputer
(IC202).
· Power output : 5V
· Reset output : “H” (Normal)
· After reset : “L”
■ Charging Control Section
1. The microcomputer (IC202) controls the following;
· Peak detection (Detected when fully charged, pin 27 of
IC202)
· Temperature control (Pin 2)
· Detection of abnormality, such as a short terminal (Pin
27)
· LED control (Red : Pin 21, Green : Pin 22)
· Trickle charging (Pin 18)
· Quick charging (Pin 17)
2. X201 is an oscillator that generates clocks for the microcomputer (4MHz).
Photo is K type.
■ Charging Switch Section
1. Q201 is a transistor that turns quick charging on and off.
2. Q202 is a transistor that turns trickle charging on and off.
3. The resistor (R204) determines the leakage current.
■ Display Section
1. LED201 is a two-color LED that indicates the charging
state.
2. Red on ............... Quick charging or warming up
Green on ............ Charging is complete
Red blinking ....... Abnormal (short terminal, short bat-
tery, or open terminal)
Charging
The charging time for each pack is shown in the table.
Battery Battery Voltage
Pack Type (Volts)
KNB-14 Ni-Cd 7.2 600 40
KNB-15A Ni-Cd 7.2 1100 60
KNB-16A Ni-Cd 7.2 1100 60
KNB-17A Ni-Cd 7.2 1500 80
KNB-20N Ni-MH 7.2 1600 80
KNB-21N Ni-MH 7.2 1600 80
KNB-22N Ni-MH 7.2 2100 110
Battery Approximate
Capacity Charging Time
(mAh) (Minutes)
KSC-24
1
4x4
3
6
8
5
2
7x2
Ax2
A
A
701
PARTS LIST / EXPLODED VIEW / PC BOARD VIEW
Parts List
✽ : New parts
New
Ref. No.
1 ✽ A02-3626-08 Cabinet (Upper)
2 ✽ A02-3652-08 Cabinet (Lower)
3 E03-0187-08 DC jack
4 E23-1058-08 Relay terminal
5 F09-0455-08 Thermal fuse
6 F53-0149-08 Fuse (2A)
7 G13-1546-08 Cushion
A N80-2610-45 Pan head taptite screw
8 W02-1932-08 Electric circuit module
– W08-0523-15 AC adapter (120V/60Hz) K
– W08-0524-15 AC adapter (230V/50Hz) E
– ✽ W08-0939-05 AC adapter (230V/50Hz) T
Parts No. Description
parts nation
Exploded View
Desti-
PC Board View
2
Electric circuit module (W02-1932-08) Component side view
R202
R223
JP7
16
30
R221
1
4
IC202
D202
R210
Q104
Q103
D102
C111
R
G
LED201
R211
C102
R114
C104
+
FB101
L101
+
C110
R113
R112
Q101
GDS
2A
DZ101
117°C
TF101
JP1
R118
R119
R117
R115
R108
C105
R109
R116
R104
R107
Q102
JP4
R110
JP2
Q205
Q206
R105
R111
R101
C103
R106
16
IC101
R203
CE
9
Q202
B
C106
C107
C108
R204
18
Q201
JP5
R102
R103
JP3
R226
D201
Q204
R225
R201
C205
R209
R213
R215
R217
R212
Q203
JP6
R214
R216
8
IC201
5
15
1
R219
R218
C202
DZ202
R224
R222
C204
R220
R206
R205
R208
C203
DZ201
C101
C201
++
±
X201
T
JA1
+
125V 2.0A
F101
+
D101
+
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