Casio JD-6500 Troubleshooting guide

R
(without price)
JULY. 1995
JD-6500(ZX-807AE)
C-320(ZX-807BE)
JD-6500
C-320
INDEX

CONTENTS
1. SPECIFICATIONS ......................................................................................................... 1
2. GENERAL GUIDE ......................................................................................................... 5
3. RESET OPERATIONS ................................................................................................ 10
4. ERROR MESSAGE ..................................................................................................... 11
5. BATTERY REPLACEMENT........................................................................................ 12
6. LSI PIN FUNCTION ..................................................................................................... 14
7. OPERATION CHECK .................................................................................................. 17
8. TO SAVE THE DATA TO OTHER UNIT ..................................................................... 19
9. TROUBLESHOOTING................................................................................................. 22
10. EXPLODED VIEW ....................................................................................................... 24
11. PARTS LIST ................................................................................................................ 25
12. SCHEMATIC DIAGRAM.............................................................................................. 27

— 1 —
1. SPECIFICATIONS
Telephone Directory Mode
Storage and recall of telephone directory data (name, telephone number, address, etc.). Each item can contain
up to 380 characters with a Fun Face. Includes secret memory area and auto sort function.
Schedule Mode
Storage and recall of appointments for any date in the range of January 1901 through December 2099. Each
item can contain up to 372 characters with an icon. Includes secret memory area and auto sort function.
Calendar Mode
Full-month calendars in the range of January 1901 through December 2099. Includes highlighting of important
dates and holidays.
Data Memo Mode
Storage and recall of memos. Each item can contain up to 381 characters. Includes secret memory area and
auto sort function.
Timekeeping Mode
Average of accuracy ±3 seconds per day under normal temperatures: Home Time (year/month/date, AM/PM,
day of the week, city name, daylight saving/standard time): World Time: full automatic calendar: 12/24 hour
timekeeping format
Alarm Mode
Daily Alarm (20-second electronic buzzer): Schedule Alarm (20-second electronic buzzer): Hourly Time Signal
(beeps every hour on the hour)
Conversion Mode
Six built-in conversion pairs (4-character unit name + 10 digit rate; user-definable)
Pet Mode
Magic Beam Mode
Data communications using infrared light (messages up to 28 characters and Telephone Directory data)
Calculator Mode
10-digit arithmetic calculations; constant calculations; memory calculations; 20-digit approximations; percent-
age calculations; square roots; sign changes; function command signs
Other functions
Contrast adjustment

— 2 —
General
Display: Liquid crystal display
Memory Capacity: 4,096 bytes
Power Supply: Main batteries – Two AAA-size batteries (LR03 (AM-4) or R03 (UM-4))
Back-up battery – One lithium battery (CR2032)
Power Consumption: 0.2W
Battery Life*: Main batteries –
LR03 (AM-4)
•approximately 380 hours continuous operation
•approximately 1.5 years (1 hour use per day)
R03 (UM-4)
•approximately 300 hours continuous operation
•approximately 1year (1 hour use per day)
Back-up battery – approximately 2 years after the low main battery warning
appears on the display (approximately 5 years if main batter-
ies are replaced immediately whenever battery warning
appears)
*The batteries that have been installed in this unit when user purchased it had been
used in the factory test, so it will be impossible to fully satisfy this specifications
when these batteries are used.
Auto Power Off: Approximately 6 minutes after last key operation
Ambient Temperature
Range: 0°C ~ 40°C (32°F ~ 104°F)
Dimensions: Open: 13.5 (H) ×145 (W) ×180 (D) mm
(1/2" (H) × 5 3/4" (W) ×7 1/8" (D))
Closed: 15.75 (H) ×145 (W) ×96.5 (D) mm
(5/8" (H) ×5 3/4" (W) × 3 3/4" (D))
Weight: 142.2 g (5 oz) including batteries

— 3 —
Memory Capacity Screen
Use the following procedures to check the status of the memory. One procedure displays the amount of
memory used and how much memory is remaining. The other shows you how many data items you have stored
in each mode.
To display the memory capacity:
1. While the main menu is displayed, or any time you are in the Telephone Directory, Schedule, Data Memo,
or Calendar mode, press FUNCTION.
2. Use and to select "Memory Capacity" and then press EXE.
• The memory values shown above are the total for both the Open Memory Area and the Secret Memory
Area.
• Press AC/ON to clear the memory capacity screen.
To display the number of items in each mode:
1. While the main menu is displayed, press FUNCTION.
2. Use and to select "Number of items" and then press EXE.
Open Memory Area
Secret Memory Area
• If you perform the above procedure while in the Open Memory Area, the number of items stored in the Open
Memory Area only are displayed. To see the number of items in the Secret Memory Area, you must perform
the above operation while accessing the Secret Memory Area.
How memory capacity is calculated
There is no limit on the amount of memory you can use in each mode, but the total amount of data that can
be stored is 4,096 bytes. The following shows how many bytes the data in each mode takes up. One character
(each newline operation counts as a character also) takes up one byte.
T elephone : 3
Schedule : 2
Data Memo : 11
T elephone : 15
Schedule : 3
Data Memo : 7
Memory used
Memory used
(Unit: bytes)
Remaining memory
(Unit: bytes)
Memory Capaci ty
F ree 3929
Used 167 4%
Current consumption
Check point TYP [µA] Max [µA]
OFF CP1 - CP3 — 28
ON (Menu) CP1 - CP3 190 300
ON (Buzzer) CP1 - CP3 — 5000
ON (Infrared) CP1 - CP3 — 75000

— 4 —
Examples:
Telephone Directory data only
When all items use 10 characters for the name, 12 characters for the phone number, and 16 characters
of the address, you can store approximately 70 items.
Schedule data only
When all items use 20 characters, you can store approximately 120 items.
Data Memo data only
When all items use 10 characters for the memo name and 10 characters for the memo content, you can
store approximately 170 items.
Sort Sequence
The following table shows the sequence used for sorting data in the Telephone Directory and the Data Memo
Mode.
Mode Bytes per Data Item
Telephone Directory (name) + (telephone number) + (address. etc.) + 15
Schedule (description) + 12
Calendar 6 bytes per calendar that contains highlighted dates
Data Memo (memo name) + (memo contents) + 3
1
2
3
4
5
6
7
8
9
10
11
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13
14
15
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178
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180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
§
→
←
÷
×
Space
!
”
#
$
%
&
’
(
)
+
,
–
•
/
0
1
2
3
4
5
6
7
8
9
:
;
<
>
?
@
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
R
S
T
U
V
W
X
Y
Z
„
¥
“
¡
¿
a
b
c
d
e
f
g
h
i
j
k
l
m
n
o
p
q
r
s
t
u
v
w
x
y
z
<
£
>
~
Á
É
Í
Ó
Ú
Ã
Õ
Ñ
á
é
í
ó
ú
ã
õ
ñ
À
È
Ì
Ò
Ù
Ç
L
Z
à
è
ì
ò
ù
ç
l
z
Ä
Ë
Ï
Ö
Ü
Æ
Œ
O
ä
ë
ï
ö
ü
æ
œ
o
Â
Ê
Î
Ô
Û
Å
U
U
â
ê
î
ô
û
å
u
u
A
E
C
D
N
R
S
T
a
e
c
d'
n
r
s
t'
A
E
C
N
S
Y
Z
Z
a
e
c
n
s
y
z
z
Ø
ø
ß
.
.
"
"
"
"
`
´
´
´
´
´
´
`
`
´
´
´
´
<
>
.
.
∗

— 5 —
SERCH Key
Cursor Keys
MENU Key
Pet Mode Key
Timekeeping Mode Key*
FUNCTION Key
Display
CODE Key
Clear Key
AC/ON Key
SHIFT Key
OFF Key
EXE Key
SPACE/Return Key
2. GENERAL GUIDE
Very important stuff! Here's where we tell you how not to lose important data stored in memory. Also, be
sure to perform the all-reset operation before using the unit for the first time. The all-reset operation is
described on section 4.
Please be sure you understand the following before using the unit.
Make back-up copies of important data!
The electronic memory in the unit store and recall information quickly and easily. But that information is
retained only as long as power is supplied by the batteries. Should the batteries go dead, or should you
remove both batteries at the same time, data stored in memory can be lost entirely. Data can also be
corrupted or lost due to a strong electrostatic charge, strong impact, or extremes in temperature and
humidity. All of this means that you should always keep written back-up copies of important data.
General Precautions
Warning!
• Never expose the unit or batteries to direct heat or flame.
• Avoid use or storage in very low temperatures. This may cause display response to slow down or fail
entirely. Very low temperatures can also shorten battery life.
• Avoid use or storage in very high temperatures. Even prolonged exposure to direct sunlight can damage
the unit. Leaving it on the dashboard of a closed car, or on a heater, is even worse.
• Avoid using or storing the unit where there is high humidity or a lot of dust. Never allow liquids to come
into contact with the unit.
• Avoid dropping the unit or otherwise subjecting it to strong impact.
• Never bend or twist the unit. Carrying it in your back pocket, for instance, can subject the unit to abnormal
bending and twisting.
• Never try to take the unit apart.
• Do not press the unit's keys with a pen, pencil, or other sharp object.
• To clean the unit, wipe it with a soft cloth. When necessary, you may wipe the exterior with a soft cloth
that has been dipped in a weak solution of a mild, neutral detergent and water.
• Never use strong liquid cleaners such as lacquer thinner or benzine to clean the unit.
• In no event will CASIO or its suppliers be liable to you or any other person for any damages, including
any incidental or consequential expenses, lost profits, lost savings, or any other damages arising out
of the use of this product.
* In this manual, all references to the HOME TIME/WORLD TIME key are indicated by TIME.

— 6 —
Displaying the Main Menu
The main menu appears on the display when you switch the power on. Whenever you are viewing any other
screen, you can always press MENU to return to the main menu.
Main Menu
Menu Icons
1Telephone Directory Mode 6Calculator Mode
2Schedule Mode 7Conversion Mode
3Calendar Mode 8Alarm Mode
4Secret Memory Area 9Data Memo Mode
5Magic Beam Mode 0Fortune Telling Mode
AMatch Maker Mode
Entering Modes
To Enter a Mode:
1. Display the main menu.
2. The icon of the current mode is highlighted on the display . Use , , , and to select another menu
icon.
3. When you have highlighted the mode you wish to select, press EXE.
To enter the Timekeeping Mode, pressTIME key. To enter the Pet Mode, pressPET. You can not select these
modes from the main menu.
12345
67890A

— 7 —
Using the FUNCTION Key
To view the function menu, press FUNCTION.
To select a function:
1. Use or to highlight the function you want to choose.
2. Press EXE.
If another function menu appears repeat steps 1 and 2.
To backstep to a previous display, press FUNCTION.
To exit the function menu, press AC/ON.
Setting the System Language
The unit can produce display messages in any one of ten language: English, Spanish, Italian, German, French,
Danish, Swedish, Dutch, Finnish, and Portuguese.
To set the system to another language:
1. Display the main menu.
2. Press FUNCTION, then use or to highlight "Language." Press EXE.
3. Use or to highlight the language you want. Press EXE.
Also note the word "Language" is displayed in each language.
To Adjust the Display Contrast
1. Display the main menu.
2. To darken the figures on the display, press . To make them lighter, press .
To Switch the Key Input Tone On or Off
1. Display the main menu.
2. Use , , , and to highlight . Press EXE.
3. Press FUNCTION. Then use to highlight "Sound," Press EXE.
4. Use to highlight "Key Tone." Use and to switch the key tone on and off. Press EXE.
Auto Power Off Function
Thisfunction automatically switches offthe power if youdo not touch anyof the unit's keys for about sixminutes.
To restore power, press AC/ON.
If you do not touch any keys for six minutes while entering or editing data, setting the current time, or setting
an alarm time, power cuts off without storing the data.
If you have set an alarm to go off, and the unit has been shut down by auto power off, the alarm will sound
anyway at its appropriate time.

— 8 —
Features and Functions
Telephone Directory Mode
Use this to keep names, phone numbers, and addresses. You can also include fun faces of the
people whose names and addresses you keep.
Schedule Mode
Stores the date, time, and type of each appointment. You can select icons to indicate each
appointment at a glance.
Calendar Mode
Displays the calendar for any month from January, 1901 to December, 2099. You can specify
holidays for highlighting.
Data Memo Mode
Stores notes and special thoughts. Diary entry consists of a memo name and the memo's contents.
Secret Memory Area
Stores your private thoughts you wish to keep confidential. No one can gain access to the Secret
Memory Area without knowing your password.
Timekeeping Mode
Home Time displays the current time where you are. World Time shows the time in any of 29 zones
around the globe. You can use 24-hour or 12-hour format, and can even specify daylight savings
time.
Alarm Mode
Lets you set alarms to the minute, for alarms to go off every hour, or for a single time each day. You
can also set the Schedule Alarm and control the key input tone.
Conversion Mode
Helps you compare US dollar values against six foreign currencies (monies), or with combinations
of currency units.
Calculator Mode
A 10-digit calculator performs most common numerical operations including percents, square roots
and memory.
Fortune Telling Mode
Once you have entered your birthday, you can check your fortune today, or for any day. Have fun
telling your friend's fortune too.
Match Maker Mode
Tells you whether or not you are compatible with that special someone.
Pet Mode
You can play with cute little puppy that romps on the display.

— 9 —
Magic Beam Mode
Makesit possible to communicate withanother unit using infraredlight, without direct communication.
Effective range
About the "Check time!" Display
When the message, "Check time!" appears on the display, press any key to display the current time. Make sure
the unit has the correct time before performing any other operation. If the setting is not correct, use the
procedure for "Setting the Date and Time" in the Operation Manual to change it.
20°
Approximately 8 meters
(8.7 yards)

— 10 —
To Perform Secret Reset:
• Perform the steps described under "To Perform All-reset" above, but select "Del Secret Data" in place
of "Reset" in step 4.
Following are the initial settings produced by the all-reset operation:
Home Time Zone: London (LON)
Home Time Setting: 12:00 AM, January 1, 1990
World Time: New York (NYC)
12/24-Hour Clock: 12-Hour Clock
Alarm: OFF
Alarm Time: 12:00 AM
Hourly Time Signal: OFF
Key Input Tone: ON
Date Format: Month/Day/Year
Language: English
When the Unit Does Not Work Correctly...
If the unit is jolted by a strong electrostatic charge or by severe impact, it may not work properly. In such
a case, first check to make sure that the main batteries and back-up battery are correctly installed, and then
perform the following operation:
1. Remove the screw that holds the small battery compartment cover in place and remove the small battery
compartment cover.
2. Press the RESET button with a thin, pointed object.
3. Look for the message, "Exit," to be highlighted on the display.
4. Press EXE. Now the message, "Check time!" should be on the display.
3. RESET OPERATIONS
Two kinds of reset operations can be performed:
• All-reset operation deletes all data in memory.
• Secret-reset operation deletes only your password and the data in the Secret Memory Area.
Important!
• Do not use a very sharp pencil to press the RESET button. Doing so can damage the unit.
• Be sure to perform the all-reset operation before you use the unit for the first time.
• After check to make sure that the main batteries and back-up battery are correctly installed, perform the
RESET operation.
To Perform All-Reset:
1. Switch the power off.
2. Remove the screw that holds the small battery compartment cover in place, then remove the small
battery compartment cover.
3. Press the RESET button on the back ofthe unit
with a thin, pointed object.
4. Press to select "Reset," then press EXE.
5. Press to select "Yes, " then press EXE.
6. The main menu will appear and all data will be
deleted.
7. Replace the battery compartment cover and
the screw that secures it in place.
If you want to cancel the reset operation
immediately after you have pressed the RESET
button, select "Exit," then press EXE.
RESET button
RESET

— 11 —
Message
Memory Full!
No Record!
Not Found!
Password
Mismatch!
Main Battery
Getting Weak!
Replace it!
Communication
Error
Meaning
Not enough room to store the data
you are trying to save.
You tried to perform a search
operation while there is no data
stored in memory.
There is no data that matches your
search specification.
The password you input to access
the Secret Memory Area does not
match the one that is registered.
The main batteries are weak.
• Error during data communications
using Magic Beam.
• Magic Beam data communications
interrupted.
Action
Press AC/ON and then delete
data you no longer need from
memory.
Input data before attempting
search operations.
Press or to recall your
search data. You can then edit
the previous data or input new
data.
Input the password correctly.
Replace the batteries in
accordance with the
instructions of this manual.
Correct problem and try again.
4. ERROR MESSAGE

— 12 —
5. BATTERY REPLACEMENT
Low Battery Warning
The message, "Main Battery Getting Weak! Replace it!" appears whenever battery power drops below a
certain level. Replace the main battery immediately after this message appears.
Whenever the low battery warning message appears, the OFF key will be the only function that works. If you
don't turn the unit off yourself, power will switch off automatically about 30 seconds after the low battery warning
appears.
Replacing Batteries
• Main Batteries
Two AAA size batteries (LR03 (AM-4) or R03 (UM-4)) are used for the main power supply. The unit will not
operate at all if main batteries are not installed.
• Back-up Battery
One CR2032 lithium battery supplies power to the memory and protects its contents.
Memory contents are lost when both the main batteries and the back-up battery are removed. Be sure always
to leave one of the batteries or back-up battery in place to protect memory contents. If, however, you remove
the main battery for any time, memory retention will depend entirely on the condition of the back-up battery.
Over a long period of time with just the back-up battery in place, memory contents are likely to be damaged.
If memory seems corrupted, clear it using the RESET procedure described on section 4.
Important!
Incorrect use of batteries can cause them to burst or leak, possibly damaging the interior of the unit. Note the
following precautions:
• Be sure that the positive (+) and negative (–) poles of the batteries are facing in the proper direction.
• Never leave dead batteries in the battery compartment.
• Remove the batteries if you expect not to be using the unit for a long period of time.
• To avoid damage to the unit from leaky batteries, replace the main batteries at least every two years, and
the back-up battery every five years. Batteries should be replaced no matter how much you use the unit
during that time.
• Never mix batteries of different types.
Warning!
• Never try to recharge the batteries supplied with the unit.
• Do not expose batteries to direct heat, short-circuit them, or try to take them apart.
• Keep batteries out of the reach of small children. If swallowed, consult a physician immediately.

— 13 —
To replace the main batteries
1. Switch power off.
2. Loosen the screw of the large battery compartment cover on the back of the unit, and slide the battery
compartment cover in the direction noted by the arrow. (Figure 1)
3. Remove the old batteries.
4. Making sure that the positive (+) and negative (-) ends of the batteries are facing correctly, load two new
batteries into the compartment. (Figure 2)
• Be sure to replace both old batteries with two new ones.
5. Insert the tabs on the bottom of the battery compartment cover into the slots of the battery compartment
and carefully close the cover. Secure the cover in place with the screw. (Figure 3)
Figure 1 Figure 2 Figure 3
To replace the back-up battery
1. Switch power off.
2. Loosen the screw of the small battery compartment cover on the back of the unit, and remove the back-
up battery compartment cover. (Figure 4)
3. Remove the old battery.
4. Wipe off a new battery with a soft cloth.Then, load it into the compartment making sure that positive (+) side
is facing up (so you can see it.) (Figure 5)
5. Insert the tabs on the bottom of the battery compartment cover into the slots of the battery compartment
and carefully close the cover. Secure the cover in place with the screw. (Figure 6)
Figure 4 Figure 5 Figure 6

— 14 —
6. LSI PIN FUNCTION
1. CPU (HC3000-08-F1)
Pin No. Signal In/Out Function
1 VREG3 Out Power supply for RAM / 3(V)
2 DUMMY – Not used
3 ~ 5 KO10 ~ 12 Out Not used
6 ~ 14 KO1 ~ 9 Out Key scan signal
15 KI8 In Not used
16 ~ 22 KI1 ~ 7 In Key input signal
23 , 25 TRANS, DUMMY – Not used
24 BUFON Out Power supply control for ROM
26 IT2 In Interrupt signal input
27 IT0 In Reception data input
28 AO17 Out Not used
29 ~ 45 AO0 ~ 16 Out Address bus
46 OEB0 Out Output enable signal for RAM and ROM
47 WEB0 Out Write enable signal for RAM
48 ~ 52 – Not used
53 CS7B0 Out Chip enable signal for RAM
54 CS6B0 Out Chip enable signal for ROM
55, 56 Out Not used
57 ~ 64 IO0 ~ 7 In/Out Data bus
65, 66 – Not used
67 OPT6 Out Turn on signal for Photo Sensor
68, 72 OPT1, 5 Out Turn on signal for LED (Infrared)
69 ~ 73 – Not used
74 PORT7 – Interrupt port

— 15 —
Pin No. Signal In/Out Function
75 ~ 77 PORT4 ~ 6 In/Out For data communication
78, 79 PORT2, 3 – Interrupt port
80 PORT1 In Communication data through Photo Sensor
81, 82 – Not used
83, 84 PI, PO In/Out Main clock terminal (3.45 MG)
85 DUMMY – Not used
86, 87 XI, XO In/Out Clock terminal (DT-26S)
88 DUMMY – Not used
89 ~ 184 S1 ~ 96 Out Segment signal for display
185 ~ 216 C1 ~ 32 Out Common signal for display
217 VSSR In GND / 0[V]
218 ~ 222 V0 ~ 4 Out The voltage for LCD drive
OFF : 0[V]
ON; V0 : 3.6 (Min) ~ 5.8 (Max) [V]
V1 : 2.9 (Min) ~ 4.6 (Max) [V]
V2 : 2.1 (Min) ~ 3.5 (Max) [V]
V3 : 1.4 (Min) ~ 2.4 (Max) [V]
V4 : 0.7 (Min) ~ 1.2 (Max) [V]
223, 224 VSS In GND / 0[V]
225 DUMMY – Not used
226 VCC In Power supply / 3[V]
227 VREG2 Out 2 [V]
228, 229 TS1, 2 – Test for manufacturer
230, 231 BZ1, 2 Out Buzzer terminal
232 SW1 In 2.6[V]
While pushing the reset button: 0[V]
233, 234 VD1, 2 – VD1: 4.7[V] VD2: 1.6[V]
235, 236 VD3, 4 – VD3: 4.7[V] VD4: 1.6[V]

— 16 —
Pin No. Signal In/Out Function
237 VDB In Low battery detection
4.4[V] < VDB < 5.2[V] ⇒Low battery message
238, 239 VREG1, 4 – VREG1: 2.6 [V]
VREG4: 5.0 [V]
240 ~ 243 VT1 ~ 4 – VT1 : 1.0[V] VT2 : 2.9[V]
VT3 : 2.0[V] VT4 : 3.9[V]
244 VLCD Out 5.9 [V]
2. RAM (LC3564QM-85)
Pin No. Signal In/Out Function
1 NC – No connect
2 ~ 10 A0 ~ 7, 12 In Address bus
11 ~ 13 I/O 0 ~ 2 In/Out Data bus
14 GND In GND / 0[V]
15 ~ 19 I/O 3 ~ 7 In/Out Data bus
20 CE In Chip enable signal
21 A10 In Address bus
22 OE In Output enable signal
23 ~ 25 A8, 9, 11 In Address bus
26 CE2 In Chip enable signal
27 WE In Write enable signal
28 VCC In Power supply / 3[V]

— 17 —
MENU
Then short in the checkpad
about two seconds.
EXE
2
1
EXE
EXE
2
EXE
EXE
EXE
EXE
Caution!
This is TEST
To Escape
Press AC KEY
1. Service Trans
2. TEST
AC. Esc
1. RAM, ROM 2. DISP
3. KEY 4. TRANS
5. RESET 6. FCC
7. OPT AC. Esc
8K RAM OK!
ROM OK!
1. RAM, ROM 2. DISP
3. KEY 4. TRANS
5. RESET 6. FCC
7. OPT
All dots display
No display
Checker display
Reverse checker display
Frame display
7. OPERATION CHECK
CAUTION : If customer's data are stored in the unit, all data will be corrupted by this operation.
STEP OPERATION DISPLAY NOTE
The checkpad is located
right side of the back-up
battery switch as shown
in figure on the next page.
RAM check
ROM check
DISPLAY check
Do
Do
Do
Do
1
2
3
4
5
6
7
8
9
10
11

— 18 —
EXE
3
MENU TIME FUNC
. . . . . . M
SPACE
7
Press 3 then locate your
hand in front of Magic Beam
ports 5 to 10 cm away.
EXE
5
STEP OPERATION DISPLAY NOTE
Same display as in step6.
MENU
TIME, FUNC, · · · SPACE/
Same display as in step 6.
1. TRAN
2. RCV (MASTER)
3. PET
PET OK!
Same display as in step 6.
RESET!
Key check
Pushthekeysequentially
appeared on the display.
Check the key sound.
After a half second, the
menu will appear.
12
13
14
15
16
17
18
19
Button battery
RESET
Checkpad