Casio fx7700GE Service Manual
fx-7700GE (LX-375)
INDEX
MAR. 1994
(without price)
R
CONTENTS
1. SCHEMATIC DIAGRAM
1-1. MAIN BOARD I........................................................................................... 1
1-2. MAIN BOARD II...........................................................................................2
1-3. MAIN BOARD III..........................................................................................3
2. SPECIFICATIONS............................................................................................. 4
3. OPERATION CHECK .........................................................................................5
4. DATA COMMUNICATIONS
4-1. CONNECTING TWO fx-7700GE UNITS ...................................................10
4-2. BEFORE STARTING DATA COMMUNICATIONS...................................11
4-3. SETTING COMMUNICATIONS PARAMETERS ......................................12
4-4. USING ALL TO SEND ALL DATA............................................................13
4-5. USING PROGRAM TO SEND PROGRAM DATA ....................................15
4-6. DATA COMMUNICATIONS PRECAUTIONS...........................................16
5. TROUBLESHOOTING......................................................................................17
6. DISASSEMBLY VIEW......................................................................................18
7. PARTS LIST .................................................................................................... 22
1. SCHEMATIC DIAGRAMS
1-1. MAIN BOARD I
— 1 —
1-2. MAIN BOARD II
— 2 —
1-3. MAIN BOARD III
— 3 —
2. SPECIFICATIONS
Display system: 16-character x 8-line liquid crystal display; 10-digit mantissa and 2-digit expo-
nent for calculations; displays binary, octal, hexadecimal, sexagesimal values,
fraction
Power supply: Main: Four AAA-size batteries (LR03(AM4) or R03 (UM-4))
Memory protection: One CR2032 lithium battery
Power consumption: 0.1W
Battery life: Main: Approximately 350 hours (continuous display of 0) on battery type LR03
(AM4)
Approximately 200 hours (continuous display of 0) on battery type R03
(UM-4)
Approximately 2 years (power switch off) on LR03 (AM4)/R03 (UM-4)
Memory protection: Approximately 1 year
Auto power off: Power is automatically switched off approximately six minutes after last opera-
tion.
Ambient
temperature range: 0°C ~ 40°C (32°F ~ 104°F)
Dimensions: 20mmH x 85mmW x 172.5mmD (3/4"H x 33/8"W x 63/4"D)
Weight: 218.5g (7.7 oz) including batteries
Accessories: Hard Case
CURRENT CONSUMPTION
TYP [µA] MAX [µA]
ON 2673 5147
OFF 15
— 4 —
3. OPERATION CHECK
NO. OPERATION DISPLAY NOTE
1
2
3
AC
RESET
F1
MAIN MENU
COMP BASE SD REG
MAT GRAPH EQUA PRGM
LINK CONT
RESET
✽✽✽✽✽✽✽✽✽✽✽✽✽✽✽✽✽✽✽✽
✽
✽✽✽✽✽✽✽✽✽✽✽✽✽✽✽✽✽✽✽✽
RESET ALL MEMORIES?
✽✽✽✽✽✽✽✽✽✽✽✽✽✽✽✽✽✽✽✽
✽
✽
✽
✽
✽
✽
✽✽✽✽✽✽✽✽✽✽✽✽✽✽✽✽✽✽✽✽
RESET
RESET ALLYES NO
RESET
ALL MEMORIES!
✽
✽
✽
✽
✽
✽
✽
SHIFT AC
4
F6 ab/c AC
Press the above keys at the
same time.
5
1
6
No Display
== Lx375 TEST ==
1. LCD 4. ROM
2. KEY 5. TRS
3. RAM 0. rst
No Display
— 5 —
NO. OPERATION DISPLAY NOTE
EXE
7
Checker Display
EXE
8
Reverse checker display
EXE
9
All dot display
10
11
12
EXE
EXE
2
Frame didsplay
== Lx375 TEST ==
1. LCD 4. ROM
2. KEY 5. TRS
3. RAM 0. rst
Trace
— 6 —
NO. OPERATION DISPLAY NOTE
F1 (Trace)F2 (ZOOM)F3 (Plot)
F4 (Line) F5 (cls) F6 (coord)
SHIFT ALPHA EXIT MENU
G↔T Graph Range MDisp
13
X.Q.T log In Sin Cos Tan
ab/c X2 ( ) ➩ > 8 9
DEL AC 4 5 6 ✕ ÷ 1 2
3 + – 0 . EXP (-)
<
➔
ZOOM Press the key
➔
➔
➔
sequentially
appeared on the
display.
14
15
–
EXE
3
== Lx375 TEST ==
1. LCD 4. ROM
2. KEY 5. TRS
3. RAM 0. rst
...
<< RAM OK >>
A few seconds
after
16
17
EXE
4
== Lx375 TEST ==
1. LCD 4. ROM
2. KEY 5. TRS
3. RAM 0. rst
...
— 7 —
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