Casio KL-1500 Troubleshooting guide

(without price)
LABEL PRINTER
KL-1500(ZX-556)
R
JUL. 1995
KL-1500

CONTENTS
SPECIFICATIONS ---------------------------------------------------------------------------------------- 1
CLEANING THE PRINTER HEAD AND ROLLER ----------------------------------------------- 2
RESET OPERATION------------------------------------------------------------------------------------- 2
BLOCK DIAGRAM --------------------------------------------------------------------------------------- 3
PRECAUTIONS ------------------------------------------------------------------------------------------- 4
ADJUSTMENT--------------------------------------------------------------------------------------------- 4
CIRCUIT DESCRIPTION-------------------------------------------------------------------------------- 5
LSI PIN FUNCTION -------------------------------------------------------------------------------------- 6
DIAGNOSTIC PROGRAM ------------------------------------------------------------------------------ 8
MESSAGES ---------------------------------------------------------------------------------------------- 10
SCHEMATIC DIAGRAM ------------------------------------------------------------------------------ 11
PARTS LIST---------------------------------------------------------------------------------------------- 15

— 1 —
SPECIFICATIONS
Input
Keyboard layout : Typewriter (QWERTY)
Character Types
Alpha (English and other languages) :151
Numbers : 10
Symbols : 117
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 : Six C-size batteries or optional AD-A95100 AC adaptor
Power consumption : 9 W
Auto power off : Approximately six minutes after last key operation
Dimensions : 68.6H X 180.5W X 161.2mmD
Weight : 508.5g (1.1 lbs)(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 —
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.
Figure-1
Figure-2
Press with a thin,
pointed object.
RESET switch
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.

— 3 —
Figure-3
BLOCK DIAGRAM
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
IC5
Q1 / Q2
BT X 6
VCON
VDD1 ( +5V for digital circuit)
VDD2 (+5V for RAM)
VP (+9V for printer)
TCON
Comparator
BA10339F-T1
POWER SUPPLY
Q3 / Q4

— 4 —
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 9V to the battery terminals.
2 : Press ON while holding down 3 keys
SET, RETURN and FUNCTION.
(Start Diagnostic Program)
3 : Press 7.(Apply the voltage Vp for printer)
4 : Apply the voltage with a power
supply so that the voltage at the
collector of Q1 is 6.2V+0.1 / -0V.
5 : Adjust a pot VR1 so that the voltage
between pin-8 of IC4 and pin-5 of
IC3 is 0 +/-0.01V.
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=SHORT, RNK2=OPEN
Head rank B : RNK1=OPEN, RNK2=SHORT
Head rank C : RNK1=OPEN, RNK2=OPEN
Head rank D : RNK1=SHORT, RNK2=SHORT
Figure-5
Figure-6
Figure-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 C5(2200µF) on the PCB Z556-1.
3 : Connect the FPC of chassis ass'y into
a connector CN4 of PCB Z556-1.
4 : Assemble the chassis ass'y.
5 : Turn the power switch on.
Chassis ass'y
FPC
CN4
PCB Z556-1
LSI1
C5
+
-
Power supply
9V ~ 6.5V
Q1
+
-
Multi-meter-1
6.2V+0.1/-0V
+
-
Multi-meter-2
0 +/-0.01V
IC3
5
8
IC4
VR1
XXXXXXB
Head rank = B
XXXXXXB

— 5 —
Figure-7
CIRCUIT DESCRIPTION
Setting the batteries or AC adaptor (see figure 7)
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 7)
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 Q4. Then both transistors Q4 and Q3 are
turned on, the voltage VDD1 is applied to all devices.
Power off sequence (see figure 7)
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 Q4 will be L. Then both transistors Q4 and Q3 are turned off, Q3 stops
to supply the voltage VDD1.
Power down sequence (see figure 7)
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 Q4 and Q3 are turned off, Q3 stops to provide the voltage VDD1.
Print sequence (see figure 7)
When the PRINT button is pressed, TCON signal is H. Then both transistors Q2 and Q1 are turned on, the
voltage VP for printing will be 9V.
VCON
++
Q2
Q1
IC5
Q3
Q4
TCON
DPW
VDD2 (+5 V)
VDD1 (+5 V)
GND
VP (+9 V)
CPU PON
POFF
ON
OFF
VDD1
IC1 VDE
Power Switch
Fuse 8.6V
8.8V 0V
0V
5.0V
4.8V
8.6V
8.8V 8.4V 0V
8.4~0V
8.4~0V
8.6V
8.8V
0V
0V
0V
0V
5.0V
4.8V 4.8V
0V
4.2V
4.8V
0V
4.8V
0V
0V
4.8V
0V
Note : The voltages around transistors mean as follows;
Upper figure : Power ON at no operation.
Lower figure : Power OFF.

— 6 —
LSI PIN FUNCTION
CPU (T6C37) : LSI1
Table-1
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~MT2 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

— 7 —
LCD driver (HD44105H) : LSI201
Table-2
Table-3
LCD driver (HD44102CH) : LSI202
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.

— 8 —
Table-4(1/2)
DIAGNOSTIC PROGRAM
Note : Make the reset operation after RAM check, because the RAM check break the data stored in RAM.
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

— 9 —

— 10 —
MESSAGES
Table-5
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.

— 11 —
SCHEMATIC DIAGRAM
PCB Z556-1 (1/2)

— 12 —
PCB Z556-1 (2/2)

— 13 —
PCB Z-556-E4 (1/2)

— 14 —
PCB Z556-E4 (2/2)

PARTS LIST FOB Japan
N Item Code No. Parts Name Specification Q M N.R.Yen R
Unit Price
Z556-1 PCB ASS'Y
LSI1 2011 9527 LSI T6C37 1 1 A
N LSI3 2012 0476 LSI HN62321AFRM2 1 1 A
LSI2 2011 9520 LSI CXK5864CM-10LL 1 1 A
IC2 2114 2436 Monolithic IC BA12003 1 5 B
X1 2590 1435 Ceramic oscillator EFOEC4004A4 1 10 C
N C5 2803 7821 Electrol
y
tic capacitor RE3-16V222M-T2 1 5 C
N C4 2803 7807 Electrol
y
tic capacitor ECEA0JKA101B 1 20 C
C17 2807 2707 Electrol
y
tic capacitor RE3-16V101M-T2 1 20 C
J1 3501 5103 AC power jack HEC3110-01-010 1 10 C
CN3 3501 6307 connector S5B-PH-K-S 1 20 C
CN4 3501 7770 connector 10FE-ST 1 10 C
L1 3013 0602 Inductor SBT-0180W 1 5 C
N SW1 3412 1449 Switch EVQ PAC 04M 1 20 C
F1 2114 3227 IC protector ICP-N25-T104 1 10 B
IC3,IC4 2116 0056 Comparator BA10339F 2 10 B
IC1 2105 2331 Detector S-80745AN-D9-T1 1 5 B
IC5 2105 2702 Re
g
ulator S-81250PG-PD-T1 1 10 A
Q1 2254 0119 FET 2SJ132-Z 1 5 B
N Q3 2259 1827 Chip transistor 2SB1197K-Q, R-T146 1 20 B
Q2,Q4 2259 0889 Chip di
g
ital transistor DTC144EKT-96 2 20 B
D2 2390 1442 Chip diode MA152K-(TX) 1 20 C
D1 2390 1827 Chip diode MA737-(TX) 1 10 C
C12,C13 2845 2030 Chip capacitor MCH215C102KK 2 20 C
C1 2981 0168 Chip capacitor MCH215C103KK 1 20 C
C8,C14 2845 2289 Chip capacitor MCH215C471KK 2 20 C
C2,C3,C6,C7, 2845 1540 Chip capacitor MCH212F104ZK 8 20 C
C9~C11,C15
C16 2845 1925 Chip capacitor MCH312F105ZP 1 10 C
R23,R24 2792 0217 Chip resistor MCR10EZHJ101 2 20 C
R25 2792 0815 Chip resistor MCR10EZHJ221 1 20 C
R14 2792 0960 Chip resistor MCR10EZHJ822 1 20 C
R15~R21 2792 0831 Chip resistor MCR10EZHJ103 7 20 C
R28 2792 1051 Chip resistor MCR10EZHJ222 1 20 C
R4 2730 0530 Chip resistor MCR10EZHJ272 1 20 C
R2 2792 0942 Chip resistor MCR10EZHJ332 1 20 C
R22,R29,R30 2792 0462 Chip resistor MCR10EZHJ473 3 20 C
R3,R31 2792 0209 Chip resistor MCR10EZHJ104 2 20 C
R26,R27 2792 0888 Chip resistor MCR10EZHJ334 2 20 C
R1 2730 0549 Chip resistor MCR10EZHJ225 1 20 C
N R8~R13 2795 4613 Chip resistor MCR10EZHF6340 6 20 C
N R5 2795 4606 Chip resistor MCR10EZHF2002 1 20 C
R6,R7 2795 1190 Chip resistor MCR10EZHF1002 2 20 C
RA1,RA2 2775 1372 Chip network resistor MNR34J5AJ563 2 20 C
VR1 2795 4620 Chip volume MVR32HXBRN502 1 20 C
Z556-E4 PCB ASS'Y
LSI202 2001 7295 LSI HD44102CH 1 1 B
LSI201 2001 7287 LSI HD44105H 1 1 B
LCD 3335 5502 LCD CD427-TS 1 1 B
VR201 2765 0798 Volume RK09G-J11T-203B 1 1 C
R210~R215 2792 0807 Chip resistor MCR10EZHJ470 6 20 C
Notes: N – New parts R – A : Essential
M – Minimum order/supply quantity B : Stock recommended
R – Rank C : Others
Q – Quantity used per unit X : No stock recommended
— 15 —

FOB Japan
N Item Code No. Parts Name Specification Q M N.R.Yen R
Unit Price
R205,R206, 2796 0581 Chip resistor MCR10EZHG472 4 20 C
R208,R209
R201 2795 0826 Chip resistor MCR10EZHG683 1 20 C
C206 2845 1925 Chip capacitor MCH312F105ZP 1 10 C
C202 2845 2212 Chip capacitor MCH215A100DK 1 20 C
C201,C203, 2845 1540 Chip capacitor MCH212F104ZK 7 20 X
C207~C211
N 1 5610 8310 Heat seal Z556 A340153-1 1 1 B
N 2 6405 5680 W tape L272 A413318-1 2 20 X
N 3 6413 5490 Center plate Z556 A340127-1 1 10 X
N 5 6413 5530 PC joiner A-Z556 A440324-1 1 10 C
N 13 6413 5520 Tape Z556 A440317-1 1 20 B
17 6401 9940 W tape L245 A412640-1 1 20 X
N 18 6413 5610 PC joiner B-Z556 A440324-2 1 10 C
COMPONENT
4 6329 1680 Screw A-G320 A44793-11 5 20 X
6 6401 9940 W tape L245 A412640-1 1 20 X
7 5111 2172 Screw 2.3X6 ZMC-3 7 20 X
N 8 6405 5310 Chassis ass'
y
A110673*6 1 1 C
N 9 6413 5510 Label A-Z556 A413317-5 1 20 X
10 6396 1960 Rubber foot L121 A411855-1 4 20 X
N 11 6413 5441 Cassette cover Z556 A211067-5 1 5 C
12 6401 9780 Label C-L245 A412596-2 1 20 X
N 14 6413 5350 Z556-E4 ass'
y
A140060*1 1 1 X
N 15 6413 5480 Displa
y
plate Z556 A340125-1 1 10 X
N 16 6413 5430 Upper case Z556 A110677-2 1 1 X
N 19 6386 9510 Screw A-V426 A310044-3 10 20 X
N 20 6413 5400 Z556-1 ass'
y
A240090*1 1 1 C
N 21 6405 5740 Batter
y
sprin
g
C-L272 A413346-1 1 20 X
N 22 6405 5730 Batter
y
sprin
g
B-L272 A413325-1 2 10 X
23 6405 5710 Batter
y
sprin
g
L272 A413323-1 1 20 X
24 3122 1876 Buzzer 7BB-15-6A25 1 10 X
25 6388 8240 W tape A-V164 A410562-1 1 20 X
26 6400 9560 Spacer A-L240 A412410-1 1 20 X
27 6413 5422 Lowe case Z556AAL A110676B-5 1 1 X
28 5041 2318 Screw 2.3 X 6 B 10 20 X
N 29 6413 5500 Label B-Z556 A413316-5 1 20 X
N 30 6413 5460 Batter
y
sprin
g
holder Z556 A211069-5 1 10 X
31 6405 5720 Batter
y
sprin
g
A-L272 A413324-1 3 20 X
N 32 6413 5470 Rubber ke
y
Z556 A211077-2 1 1 X
N 33 6413 5450 Batter
y
cover Z556 A211068-5 1 5 C
6402 9720 FCC label L387 A412826-1 1 20 X
Notes: N – New parts R – A : Essential
M – Minimum order/supply quantity B : Stock recommended
R – Rank C : Others
Q – Quantity used per unit X : No stock recommended
— 16 —

— 17 —
1
2
3
4
5
6
7
8
9
10
11
12
29
30
31
4
32
33
10
13
14
15
16
17
18
19
7
20
21
22
23
24
26
27
28
10
25

— 16 —