Casio EX-268EC, Руководство по обслуживанию

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A B C D E F G H I
Power ON 9.65 VAC 10.52V 5.76V 10.45V 0.78V 0.12V Pulse 5.07V -23.9V
Plug out 0 0 0 0 0 4.13V 0 4.30V 0
Voltage level is measured at the following condition.
1. Plug the power cord in AC outlet.
2. Mode switch position : REG, display 0.00
3. Put in the memory protection batteries.
4. Plug out : Plug out the power cord , the memory protection batteries in.
5-2. Reset circuit
CPU does not work properly when the VDD is unstable.
The reset IC,S-80728AN, is used to know if the VDD is
stable or not. When the VDD voltage becomes 2.8V or
more, the output of the reset IC becomes "H" level.
ZD2
ZD3
R6
C-1
R8
R15
C25
C-11
A C I N
G N D
C N 8
1
5
7
1
A C I N
H O T
R1
1 0 6
T 1
C 1
D1
D2 D3 D4
125V
1A
F1
B - 2
C 2
V F 2
4 1
B - 3
C - 2
C 3
C14
C - 3
D - 3
F - 1
F - 2
C 1 6
C 1 7
C - 3
µ
P D 7 8 0 4 2 A G F
CMK-P2X
B - 4
2 0 C N 3
T 2
R 5
D I S P 1
C-12
C-13
Q 5
E B
C-9
C-10
D9
X 1
X 2
C18
R11
IC2
E-1
1
3
E-2
BR93LC46A
C8
CN4
C9
ZD1
R2
R3
C10
B E
Q1
C6
B-1
CN1
1 2
Q2
E
B
D6
R4
C7
Q3
E B
C11
C12
D8
E B
Q4
2
1
R7
CN2
R9
ZD4
D7
VN
R10
CN5
2
C13
VF1
1
D-2
4
1
B-12
BZ1
B-8
IC1
C19
S-80728AN
C20
R12
VDD
Q6
E
B
VP
ZD5
R14
C22 C21
R17
R13
GND
R16
C23 B-11
C-21
C-22
C-23
E B
Q7
F-4
C27 B-14
A-3 L2
A-4
C31
F-6
B-13
C24 C26
R21 R22 R23
CN7
1
8
R20
R19 R18
L1
IC4
LBI268
A-1
A-2
C30
B-15
C29
C28
E266-1
A
C26
21
F-3 F-5
C-14
B-9
B-10
C-15
C-17
C-20
C-16
C-18
C-19
C15
D-1
B-5 B-6 B-7 C-4
C-5 C-6 C-7 C-8
C5
D5
C4
A
B
D
C
G
H
I
E
F
GND
RESET
Pin No.17
VDD
GND
S-80728AN