Casio KL-7000 Troubleshooting guide

(without price)
LABEL PRINTER
KL-7000(LX-271)
R
MAR. 1995
KL-7000(BK) KL-7000(GY)

CONTENTS
SPECIFICATIONS------------------------------------------------------------------------------------------------1
CLEANING THE PRINTER HEAD AND ROLLER------------------------------------------------------2
RESET OPERATION--------------------------------------------------------------------------------------------2
BLOCK DIAGRAM-----------------------------------------------------------------------------------------------3
PRECAUTIONS---------------------------------------------------------------------------------------------------4
ADJUSTMENT-----------------------------------------------------------------------------------------------------4
MEASUREMENT--------------------------------------------------------------------------------------------------5
CIRCUIT DESCRIPTION---------------------------------------------------------------------------------------6
LSI PIN FUNCTION---------------------------------------------------------------------------------------------7
DIAGNOSTIC PROGRAM-------------------------------------------------------------------------------------9
MESSAGES--------------------------------------------------------------------------------------------------------11
DISASSEMBLY PROCEDURE-------------------------------------------------------------------------------12
SCHEMATIC DIAGRAM----------------------------------------------------------------------------------------13
PARTS LIST------------------------------------------------------------------------------------------------------18
EXPLODED VIEW-----------------------------------------------------------------------------------------------20

— 1 —
SPECIFICATIONS
Input
Keyboard layout : Typewriter (QWERTY)
Character Types
Alpha (English and other languages) : 151
Numbers : 10
Symbols : 153
Illustrations : 50
Display
Type : 48 X 32-dot liquid crystal display
Number of columns : 8
Character matrix : 16 X 16-dot
Printing
Type : 64-dot thermal transfer
Speed : Approximately 6.76 mm / second
Width : 4 mm (6 mm tape) or 8 mm (other tape)
Character matrix : 24 X 24-dot (normal) ; 16 X 16 dot(s)
Character fonts : Serif, sans-serif
Character styles : Normal, outline, shadow, raised
Character effects : Underline, box
Character sizes : 1X1, 1X2, 1X3, 2X1, 2X2, 2X3, L2X3, S1X1, S1X2, S1X3, S2X1,
S2X2, S2X3
Character pitch : None (0 mm), narrow (0.5 mm), wide (1.0 mm)
Number of line : 1 or 2 (6 mm tape) ; 1 to 4 (other tapes)
Memory
Text : Up to approximately 326 characters
General
Main power supply : Eight AA-size batteries or optional AD-A95100 AC adaptor
Memory backup battery : Once CR2032 lithium battery life = approximately one year
Power consumption : 9 W
Auto power off : Approximately six minutes after last key operation
Dimensions : 48.8H X 174W X 224.8mmD
Weight : 513 g (Including batteries)
Ambient temperature : 10 °C ~ 35 °C
Threshold of voltage detection
Low battery : Vbat = 6.2V ±2.5%
Forced power off : Vbat = 5.0V ±5.0%
Note : Vbat = power source (Batteries or AC adaptor)

— 2 —
RESET OPERATION
If you experience serious malfunction of the unit or if operation fails completely, try performing the following
operation to reset the unit.
1 : Turn the power switch off.
2 : Open the tape cartridge compartment cover and remove the tape cartridge.
3 : Press the reset switch inside the tape cartridge compartment to reset the unit.
NOTE : 1.Take care not to press the RESET switch too hard with pointed object. Doing so can cause
malfunction.
2.Never press the RESET switch expect when the unit fails to operate correctly.
3.Data stored in memory is not cleared when you press the RESET switch.
Figure-1
Figure-2
CLEANING THE PRINTER HEAD AND ROLLER
1 : Make sure to turn the power switch off.
2 : Open the tape cartridge compartment cover.
3 : Remove the tape cartridge.
4 : Use a cotton swab dipped in alcohol to clean the printer head and roller.
5 : Replace the tape cartridge and close the compartment cover.
Press with a thin,
pointed object.
RESET switch

— 3 —
BLOCK DIAGRAM
Figure-3
Motor
driver
BA12003
LCD 49 X 32
CD427-TS
CPU
T6C37
Keyboard
RAM
CXK5864CM-10LL
ROM
TC531001CF-15
LCD driver
HD44102CH
SEGMENTCOMMON
LCD driver
HD44105H
Thermal
Head
Chassis unit
RH5VL45AA-T1
Reset IC
Q6 / IC5
Q2 / Q3
BT X 8
VCON
VDD1( +5V for digital circuit)
VDD2 (+5V for RAM)
)
VP (+12V for printer)
TCON
CR2032 (Back-up battery)
Comparator
BA10339F-T1
POWER SUPPLY
IC5 / Q5 / Q4

— 4 —
PRECAUTIONS
To prevent damage of the thermal head caused by static electricity when assembling the chassis ass'y into the
unit, the following steps must be followed;
1 : Turn the power switch off.
2 : Discharge the capacitor C18(2200µF) on the PCB L271-1.
3 : Connect the FPC of chassis ass'y into
a connector CN301 of PCB L271-2.
4 : Assemble the chassis ass'y.
5 : Turn the power switch on.
ADJUSTMENT
Adjustment of low battery detection circuit
To adjust the threshold voltage of the low battery detection circuit, the following steps must be followed;
1 : Apply 6.2V + 0.1V / -0V to the battery terminals.
2 : Ground check pads CP45 and CP46.
3 : Adjust a pot VR1 so that the voltage between CP1 and CP2 is 0V ±10 mV.
Setting the thermal head rank
Set the thermal head rank with pads RNK1 and RNK2 on the PCB L271-1 according to the following conditions
when replacing the chassis ass'y or thermal head. The head rank is indicated on FPC as following figure-6.
Head rank A : RNK1=ON, RNK2=OFF
Head rank B : RNK1=OFF, RNK2=OFF
Head rank C : RNK1=ON, RNK2=ON
Head rank D : RNK1=OFF, RNK2=ON
Figure-5
Figure-6
FPC
PCB L271-1
PCB L271-2
CN301
C18
LSI1 Chassis ass'y
PCB-L271-1
+
-
Multi-meter
+
-
CP1
CP2 VR1
CP45
CP46
GND
Power supply
6.2V (+0.1 / -0 V)
BATT+
BATT-
Chassis ass'y
XXXXXXB
XXXXXXB
Head rank = B
Figure-4

— 5 —
MEASUREMENT
Measure each value according to the following table and figure, if necessary.
Table-1
Figure-7
Measurement point Voltage / Current Condition
VDD1 Min. 4.72V IDD1 = 30 mA
Max. 5.4V
VDD2 Min. 4.72v IDD2 = 30 mA
Max. 5.4v
VP Min. 11.70V IP=300 mA
Max. 12.24V
Ibat Typ. 25 mA Turning power SW on.
(Displaying) Max. 100 mA
Ibat Typ. 0.6A When printing "CASIO COM..." at diagnostic program
PRINT CHECK-1.
(Printing) Max 0.7A When printing " ! " at diagnostic program PRINT CHECK-1.
Ibu Min. ---- Turning power SW off and disconnecting power
(Power off) Max. 15 µA source Vbat. Then supply +3V from CR2032.
Note : Ibat = Power source (Batteries or AC adaptor)
Ibu = Back-up battery (CR2032)
Vbat = 12V ±2%)
Vbat
GND
Ibat
A
V
PCB L271-1
A
A
A
V
V
V
VDD1
(DP8)
VDD2
DP6
VP
DP5
DP1
DP2
IDD1
IDD2
IP
A
Ibu DP7
CR2032

— 6 —
CIRCUIT DESCRIPTION
Setting the batteries or AC adaptor (see figure 8)
When setting the batteries or AC adaptor, the voltage VDD2 is always applied to RAM and CPU since Q6 and
IC5 are turned on.
Power on sequence (see figure 8)
When the power switch is turned on, PON signal is being H (PON = VDD2). CPU knows to turn the power switch
on, it provides H from VCON terminal to base of transistor Q5. Then both transistors Q5 and Q4 are turned on,
the voltage VDD1 is applied to all devices.
Power off sequence (see figure 8)
When the power switch is turned off, POFF signal is being H(POFF= VDD2). CPU knows to turn the power
switch off, VCON signal and base of Q5 will be L. Then both transistors Q5 and Q4 are turned off, Q4 stops to
supply the voltage VDD1.
Power down sequence (see figure 8)
If the voltage across the batteries lowers and the terminal DPW of CPU comes less than 4.5V, VCON signal is
L. Then both transistors Q5 and Q4 are turned off, Q4 stops to provide the voltage VDD1.
Print sequence (see figure 8)
When the PRINT button is pressed, TCON signal is H. Then both transistors Q2 and Q3 are turned on, the
voltage VP for printing will be 12V.
Figure-8
VCON
+++
Q2
Q3
Q6
IC5
Q4
Q5
TCON
DPW
VDD2 (+5 V)
VDD1 (+5 V)
GND
VP (+12 V)
CPU PON
POFF
ON
OFF
VDD1
IC1 VDE
Power Switch
Fuse
12.0V
12.0V 5.0V
5.0V
11.3V
12.0V
11.3V
12.0V 0V
0V
5.0V
5.0V
12.0V
12.0V 11.6V 0V
11.6V
12.0V
12.0V
12.0V
0V
0V
0V
0V
5.0V
5.0V 5.0V
0V
4.4V
5.0V
0.1V
5.0V
0V
0V
4.8V
0V
4.6V
4.6V
Note : The voltages around transistors mean as follows;
Upper figure : Power ON at no operation.
Lower figure : Power OFF.

— 7 —
LSI PIN FUNCTION
CPU (T6C37) : LSI1
No Name I / O Function
1 RD O Read signal for memory devices
2 WR O Write signal for memory devices
3 VDD I +5V source
4~15, 17~21 A0~A11, EA12~EA16 O Address bus
16 GND I Ground (0V) source
26 VDD I +5V source
27 RC1 O Chip enable signal for ROM
29 RC3 O Chip enable signal for RAM
31 RNK1 I Thermal head rank setting
32 RNK2 I Thermal head rank setting
33 PSTB O Strobe signal for thermal head
34 LTCH O Latch signal for thermal head
35 SO O Data
36 PCLK O Clock pulse for thermal head
37 VDD I +5V source
38 XIN I Main clock input
39 XOUT O Main clock output
40 GND I Ground (0V) source
41~44 MT1~MT4 O Motor drive signal
45 TCON O Control signal for voltage VP
46~52 VCK0~VCK6 I Voltage detecting signal for low battery
53 RSI I Reset delay input
54 RSO O Reset delay output
55 VDE I Reset signal input
56 VCON O Control signal for voltage VDD1
57 PON I Power on signal from power switch
58 POFF I Power off signal from power switch
59~66 KI0~KI7 I Key input signal
67~75 KO0~KO8 O Key common signal
79 DPW I Voltage detecting signal for forced power off
81 RX --- Serial data input. Connected to VDD1
83~85 TAP1~TAP3 I Tape cartridge selecting signal. Connected to GND
86 LCS O Chip enable signal for LCD driver
87 RSTL O Reset signal for LCD driver
88 CRES I Reset timing signal input. Connected to reset pad
89, 90 DSW, GND --- Connected to GND
91 NBZ O Buzzer signal output
92 BZ O Buzzer signal output
93~100 CD0~CD7 I/O data bus
Table-2

— 8 —
LCD driver (HD44105H) : LSI201
LCD driver (HD44102CH) : LSI202 Table-3
Table-4
No Name I / O Function
1~12, 41~60 X1~X32 O LCD drive output
13 DL I /O I/O pin for 2 way shift register and shift data
14 GND Ground
15, 16 FS1, FS2 I Select frequency
17~19 DS1~DS3 I Select display duty
20 C Oscillator
21 R Oscillator
22 CR Oscillator
23 STB I Input pin for test use
24 SHL I 2 way shift register, select shift direction
25 M/S I Master/slave switching M/S=H : master mode
M/S= L : slave mode
26, 27 ø1, ø2 O Output pin to HD44102CH operation clock. The
frequency is half the frequency of the oscillator.
28 FRM O Display synchronize signal (frame signal)
29 VCC +5V source
30, 32, 35 NC Not used
31 M I/O LCD drive alternating signal
33 CL I/O Shift register shift clock Output at master
Input at slave
34 DR I/O I/O pin for 2 way shift register and shift data
36 VEE Power source for LCD drive circuit. 0~+5.5V
37~40 V1~V4 LCD drive level power V1, V2 : Selecting level
V3, V4 : No selecting level
No Name I / O Function
1~22, 24~40, 70~80 Y1~Y50 O LCD drive output signal
23, 62 NC Not used
41 VCC I +5V source
42 BS I
Bus select
BS=L : DB0~DB7 work at 8-bit
BS=H : DB4~DB7 are only active a 4-bit.
8-bit data is split in two and accessed in order.
43 RST I Reset signal. Set RST signal to low level and display is
turned off.
44~46 CS1~CS3 I Chip select
47 E I Enable R/W=L : latches E fall DB0~DB7
R/W=H : E=H sends data to DB0~DB7
48 R/W I
Read/Write
R/W=H : Sends data to DB0~DB7 when E=H, CS2, 3=H
R/W=L : Receive from DB0~DB7 when CS2,3=H or
CS1=H
49 D/I I
Data/Instruction
D/I=H : Indicates that DB0~DB7 data is display data
D/I=L : Indicates that DB0~DB7 data is display control
data
50~57 DB0~DB7 I/O Data bus
58 FRM I Display synchronize signal (frame signal) When FRM=H, the 5-bit display line counter is reset, and
synchronizes the common signal and frame timing.
59 CL I Display synchronize signal. Synchronizes with the rise of the CL signal, and sends the liquid crystal signal for
the display data.
60, 61 ø1, ø2 2 phase clock for internal operation
63 M I Alternating signal for LCD drive output
64 GND Ground source
65 VEE Power source for LCD. 0~+5V.
66~69 V1~V4 Level power for LCD drive. V1 / V2 : Selecting level.
V3 / V4 : No selecting level.

— 9 —
Check item Operation Display Note
(BOOT) Press ON while pressing
keys, SET + RETURN +
FUNCTION
Main menu
RAM CHECK
(1 RAM) Beep
(After a few seconds) To return the main menu, press
any key.
LCD CHECK
(2 LCD) Frame
Any key All dots
Any key Checker
Any key Reversed checker
1
RAM
64KOK
ROM 1MOK
XXXX
0 ALL 7 VP
1 RAM 2 LCD
3 KEY 4 SW
5 PR1 6 PR2
2
DIAGNOSTIC PROGRAM
Note : Make the reset operation after RAM check, because the RAM check break the data stored in RAM.
Table-5(1/2)

— 10 —
PR-1 (Normal printing result)
PR-2 (Normal printing result)
Table-5(2/2)
Figure-9
Figure-10
Check item Operation Display Note
KEY CHECK
(3 KEY) Press the key according to what is appeared on the LCD.
Press any key after last key
check to return the main menu.
RANK CHECK
(4 SW) Check the rank of the thermal head employed in the unit.
(RANK = A ~ D)
PRINT CHECK-1
(5 PR1) Refer to the following figure-7.
PRINT CHECK-2
(6 PR2) Refer to the following figure-8.
VP CHECK
(7 VP) TCON signal from CPU is H, voltage VP is applied to the
thermal head and stepping
motor.
ALL ITEM CHECK
(0 ALL) The 5 check items are proceeded automatically by
pressing any key, according to
the following order.
RAM---LCD---KEY---SW---PR1
3
1
4RANK X
5NOW
PRINTING
6NOW
PRINTING
7Vp ON
0

— 11 —
MESSAGES
Message Meaning Action
NO DATA! There is no data stored in memory. Store some data before trying to
perform this operation.
NOT ENOUGH
MEMORY! There is not enough unused memory to perform the operation. Reduce the size of the data you are trying to store or delete data already
stored to make room for the new data.
NOW PRINTING Printer is performing printing operation. Wait for printing operation to end.
NOW PRINTING CUT
THEN [SET]! Printing is paused for a tape cut operation. Cut the tape and then press SET to resume printing.
SAME NAME
ALREADY USED! The name you are using when storing data in memory is already used. Use a different name or delete the data in memory this is under the same name.
TEXT DOES NOT FIT! Text is too long to fit in the specified tape
length. Reduce the size of the characters or shorten the text.
TOO MANY LINES! Text has too many lines to fit on tape. Reduce the number of lines.
TOO MANY LINES
TO FRAME! Text has too many lines to fit into a frame. Reduce the number of lines.
WHERE? Unit is asking for the starting point of the
operation you are performing. Use and to move the cursor to the starting point and press SET to specify it.
CANNOT COMBINE! Previously input text cannot be
combined with new input text. Perform the operation and input new text.
CANNOT USE 6 mm Current operation cannot be performed
using 6 mm tape. Change to a different tape size.
CLEARS INPUT TEXT! The operation you have selected will
clear the text you previously input. Proceed with the operation (and clear the text), or press ESC to abort without
clearing anything.
DATA ERROR!
RESET! Memory data has become corrupted for some reason. Reset the unit. Note that the reset operation deletes all data in memory.
INITIAL? Memory initialization is required. Initialize memory.
INPUT TEXT! Unit is requesting input of text. Input the text you want to print.
LOW BATTERY Battery power is low. Replace batteries or use AC adaptor.
MEMORY FULL! Memory is full and data cannot be stored. Delete data you no longer need and
make room for new data.
OUT OF FORMAT
RANGE! Input text exceeds the range of the selected format. Shorten text or use a different format.
ERROR! The number of lines in the input text is
greater than the number of lines in the
format being specified.
Reduce the number of lines in the text
or use a different format.
There is a character size indicator inside
the text for which a format is being
specified.
Delete the character size indicator from
the text before specifying a format.
Table-6

— 12 —
DISASSEMBLY PROCEDURE
1 : Remove the battery cover, batteries and ink ribbon cassette.
2 : Remove 8 screws holding the lower cabinet and take it off.
(Refer to figure-11)
3 : Re-solder 6 wires from Buzzer and battery terminals.
4 : Remove 4 screws(A) holding PCB L271-1 and take out the connector CN3 on PCB L271-1.
5 : Take out FPC of chassis ass'y from PCB L271-2 and remove 2 screws(B) holding the PCB L271-2.
6 : Remove 10 screws(C) holding PCB L271-E4, 2 screws(D) holding the LCD and take off them.
7 : Remove 3 screws(E) holding the chassis ass'y and take off the chassis ass'y.
(Refer to figure-12)
8 : Remove a spring(X) and the tape fixing plate.
9 : Remove 2 screws(F) holding the scissors sub ass'y and a spring(Y).
10 : Take off the scissors sub ass'y.
Figure-11
Figure-12
(D)
(E)
(A)
(B)
(C)
Upper cabinet
Chassis
L271-E4
L271-1
L271-
2
FPC LCD
CN3
(X)
(F)
(Y)
Chassis ass'y ( = scissors sub ass'y)
Tape fixing plate

— 13 —
SCHEMATIC DIAGRAM
PCB L271-1 (1/2)

— 14 —
PCB L271-1 (2/2)

— 15 —
PCB L271-E4(1/2)

— 16 —
PCB L271-E4 (2/2)

— 17 —
PCB L271-2

— 18 —
EXPLODED VIEW
Component
1
2
3
4
5
6
7
13
14
15
14
16
17
12 11
10
9
8
20
21
22 23
38
37
36
15
14
35
32
31
28
29
30 33
34
39
40
42
43
41
18
19
44
45
24
25
26
46
47
50
51
48
49
32
7
52
27
54
53