Casio SFA7, DC-8000 Service Manual
SF-A7(LX-553A)
DC-8000(LX-553B)
FEB. 1995
(with price)
SF-A7
R
CONTENTS
SPECIFICATIONS ............................................................................................................1
REPLACING THE BATTERIES ........................................................................................2
TO RESET THE UNIT'S MEMORY...................................................................................2
TO SAVE THE DATA........................................................................................................3
OPERATION CHECK .......................................................................................................4
LOW BATTERY TEST ......................................................................................................6
TROUBLESHOOTING ......................................................................................................6
SCHEMATIC DIAGRAM ...................................................................................................7
EXPLODED VIEW.............................................................................................................9
PARTS LIST....................................................................................................................10
SPECIFICATIONS
Main Modes: Telephone Directory, Memo, Schedule, Reminder, Home Time, World Time
and Calculator.
Data storage: Storage and recall of telephone, memo, schedule, reminder data; secret
area; editing; memory status display.
Clock: Worldtime; reminder alarm; daily alarm; hourly time signal; accuracy under
normal temperatures: ±3 seconds average
Calculation: 10-digit arithmetic calculations; arithemetic constants (+, –, ×, ÷); independ-
ent memory; percentages; square roots; 20-digit approximations; other
mixed calculations
General:
Display element: 16-column × 3-line LCD
Memory capacity: 32KB (32768 bytes)
Main component: LSI
Power supply: 2 lithium batteries (CR2032)
Power consumption: 0.02 W
Battery life*: Approximately 1 year (1 hour use per day); approximately 1,800 hours
repeating one minute of input and 10 minutes of display in Telephone
Directory.
* The batteries that come installed in this unit when you purchase it are for
factory test purposes, so they will probably not provide normal service life.
Auto power off: Approximately 6 minutes after last key operation
Operating temperature: 0°C ~ 40°C (32°F ~ 104°F)
Dimensions (HWD):
Unfolded: 9.3 x 130 x 159.7 mm (3/8 x 5 1/8 x 6 1/4 inches)
Folded: 12.4 x 130 x 82 mm (1/2 x 5 1/8 x 3 1/4 inches)
Weight: 95.6 g (3.4 oz)
— 1 —
REPLACING THE BATTERIES
1. Loosen the screw on the back of the unit that holds the battery
compartment cover in place, and remove the cover by sliding
it to the direction indicated by the arrow.
2. Loosen the screw that secures one of the two battery holders
in place and remove the battery holder.
Caution: Be sure to remove only one battery at a time.
Otherwise, you will lose all data stored in memory.
3. Replace the old battery with a new one, making sure that the
positive (+) side of the new battery is facing up (so you can
see it).
4. Replace the battery holder and secure it by tightening its screw.
•Be careful that you do not overtighten the screw.
5. Repeat Steps 2 through 4 for the other battery.
•Be sure to replace both batteries. Never mix old batteries
with new ones, and be sure to use CR2032 lithium batteries
only.
6. After you replace both batteries, replace the battery compartment cover and secure it by tightening its screw.
•Be careful that you do not overtighten the screw.
TO RESET THE UNIT'S MEMORY
Warning!
The following procedure erases all data stored in the memory of the unit. Perform the following operation
only when you want to delete all data and initialize the settings of the unit.
Remember — you should always keep copies of important data by writing it down.
RESET button
1. Switch on power and press the RESET button with a thin, pointed object.
Warning!
The next step deletes all data stored in the unit's memory. Make sure that you really want to delete the data
before you continue!
— 2 —
2. Press EXE to reset the memory and delete all data or any other key to abort the reset operation without
deleting anything.
Following the reset operation described above, the Home Time display appears and the unit settings are
initialized as noted below.
Home Time: 12-hour format
JAN/1/1995
AM/12:00 00
Zone: Tokyo (TYO)
World Time: London (LON)
Daily Alarm: 12:00 AM
Sound: Reminder alarm → OFF
Daily alarm → OFF
Key input tone → OFF
Hourly time signal → OFF
TO SAVE THE DATA
The unit can transfer the data stored to another unit.
CAUTION: Before connecting wires, be sure to put the units in transmission and receiving mode.
Furthermore, after completing saving data, remove wires while showing OK or NG on display. If no, data
stored in customer's unit are corrupted.
To save the data, the following steps must be followed;
1. Remove the battery cover of both units.
2. Press RESET button of both units.
3. Short the pad TR of customer's unit. (Display shows "T".)
4. Short the pad TR twice of slave unit. (Display shows "R".)
5. Connect 4 terminals on PCB with wires as shown in the figure below.
Customers Slave
RESET button RESET button
Enlarge Enlarge
CP12
CP10
CP11
CP13
CP2
— 3 —
CP10
CP11
CP12
CP2
CP10
TR
CP2
CP11
CP13
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