Built-In Charger Circuit; Outline - Canon ZR70 MC A Service Manual

3. Built-in Charger Circuit

DC
MAIN P.C.B.
P.C.B.
3
DC
2
JACK
1
BATTERY
5,6
3,4
2
D
1
B

3-1 Outline

The main circuit elements and their functions are as follows.
(1) IC100 : MODE MI-COM
• Charging voltage and charging current control
• Detection and display of charging progress
• Error discrimination and display
• Battery type discrimination and DC jack input detection
(2) IC 1802 : OPE AMP
• Signal amplification for detecting charging current
(3) Q1802/Q1803 : MOS form FET
• Power supply changeover switch
(4) Q1804/Q1805 : TRANSISTOR
• Trickle charge switch
CN3201
DC J SW
DC+
DC-
IC1802
CN3202
BATT+
BATT-
BATT INFO AD
BATT E3 BATT E3
CHAPTER 2. TECHNICAL DESCRIPTION
IC103
RESET
Q1805
Q1803
Q1804
Q1802
Fig. 2-4
2-7
ZR70 MC A, ZR65 MC A, ZR60 A
DC JACK DET
73 71
INIT CHG2
100
BATT AD
87
INIT CHG1
99
IC100
MODE
MI-COM.
CHAGE
41
A/D I
90
89 88