Casio FX-D400 Troubleshooting guide

DEC. 1992
fx-D400(LX-350)
fx-P401(LX-351)
R
(without price)
INDEX

CONTENTS
1. SCHEMATIC DIAGRAM
1-1. Main Board-1 (fx-D400) ...................................................................1
1-2. Main Board-1 (fx-P401) ...................................................................2
1-3. Display Block (fx-D400/P401) .........................................................3
1-4. Main Board-2 (fx-D400/P401) ..........................................................4
2. SPECIFICATION.........................................................................................5
3. OPERATION CHECK ................................................................................6
4. ASSEMBLY VIEW .....................................................................................8
5. PARTS LIST...............................................................................................9

— 1—
1. SCHEMATIC DIAGRAM
1-1. Main Board-1 (fx-D400)

— 2—
1-2. Main Board-1 (fx-P401)

— 3—
1-3. Display Block (fx-D400/P401)

— 4 —
1-4. Main Board-2 (fx-D400/P401)

— 5 —
2. SPECIFICATION
Display: 16 digits dot matrix display, 10-digit mantissa plus 2-digit exponent
Power source: One button-type battery (type; LR44, SR44)
Power consumption: 0.0001 W
Battery life: Approximately 4,000 hours (continuous use) on type SR44 battery.
Approximately 2,000 hours (continuous use) on type LR44 battery.
Ambient temperature range: 0°C ~ 40°C (32°F ~ 104°F)
Dimensions: 9.7mmH ×74mmW ×141mmD (3/8”H ×27/8”W ×51/2”D)
Weight: 65g, (2.3oz.) including battery

— 6 —
3. OPERATION CHECK (fx-D400)
OPERATION DISPLAY
POWER OFF
hqi while pushing h and q , push i
i
i
i
i
p0123Aq45/
647+e9-8ry
il*2Z
L;zx
ffgu
vbnm,
iscsl2Z
wct2Z
EZ~
d
ai
hqi while pushing h and q , push i
iiii
ai
No display
No display
All dots display
Checker
Reverse checker
ON D
–
ON D 1.
ON D 4.
ON D
°sinh cos tan–
ON D
' 2log–
ON D
' 2logIn–
ON D 2.
ON D
250.E-0.3
ON↓D
1.u 2.m 3.k 4.M
No display
No display
No display
ON D
–

— 7 —
OPERATION DISPLAY
POWER OFF
hqi while pushing h and q , push i
i
i
i
i
p0123Aq45/
647+e9-8ry
il*2Z
L;zx
ffgu
vbnm,
iscajk2
Zwct2Z
d
ai
hqi while pushing h and q , push i
iiii
ai
(fx-P401)
No display
No display
All dots display
Checker
Reverse checker
ON D 1.
ON D
–
ON D 2.
ON D
' 2logIn–
ON D
' 2log–
ON D
°sinh cos tan–
ON D 4.
ON↓D
1.u 2.m 3.k 4.M
No display
No display
No display
ON D
–

— 8 —
4. DISASSEMBLY VIEW
G
AB
1
0
H
CD
9
8
EF
37
6
45
I
2
D
D
D - D
a
a
a
a
a
a