Power Supply Circuit; Startup Of Power Supply - Canon ZR70 MC A Service Manual

2. Power Supply Circuit

<Outline>
In this product, a novel type of power supply system including a compact adapter (CA-570) is adopted for enhancement of cost
performance and power savings.
In comparison with the conventional products, this machine provides the following advantageous features:
• When the DC jack is disconnected from the battery with power turned ON, poser goes OFF once.
• The internal battery is charged only when the MAIN switch is at the P OFF position.
• When the DC jack not connected with power source (not supplied with power) is inserted into the main unit, power is not turned
on even if the battery is mounted. "A changeover of main power to the battery is not made since an event of DC jack mechanism
detection takes precedence."

2-1 Startup of Power Supply

MAIN P.C.B.
CN3201
DC+ 2
DC J SW 3
CN3202
5
BATT+
6
Card P.C.B.
12
LITHIUM
BATTERY
CN4001
21
CN100
3 13
3V
14
REG.
DET 4
SW 12
RESET 11
2.6V
2
DET.
IC102
BACK UP
5 7
DVDD 3V
IC103
4
RESET
VTR ON
PM SECTION
Fig. 2-1
2-3
ZR70 MC A, ZR65 MC A, ZR60 A
CHAPTER 2. TECHNICAL DESCRIPTION
EJ SW
DMC-III
CASSETTE
IN SW
JACK
31 12
CN2101 CN303
EJECT SW
18 E3 DET
E3V
14
VTR
POWER SW
62
VCC
CAMERA
97
POWER SW
10
RESET
25 LI DET
MODE
71 DC J DET
MI-COM.
73
UNREG DET
52 VTR ON
41
IC2301
MI-COM.
(VIC3)
POWER SW
9 10
CN101
66
67
CAS IN
76
77
IC100
SERIAL
DATA
FR