JWE Manual - Marsden Scales

JWE Series
Service
Manual
Content
1.Assembly Drawing
1-1 Explosive view………………………………………………………
1-2 Part list………………………………………………………………
2. Electronic Construction
2-1 PCB board wiring…………………………………………………..
2-2 Wiring configuration………………………………………………..
2-3 Circuit diagram……………………………………………………..
3. RS-232 Communication
3-1 RS-232 circuit diagram…………………………………………….
3-2 Single option………………………………………………………..
3-2-1 Scale to Printer…………………………………………………..
3-2-2 Scale to PC……………………………………………………….
3-2-3 Scale to light tower……………………………………………….
3-2-4 Scale to PC and Light……………………………………………
3-2-5 Scale to Printer and light tower…………………………………
3-3 RS-232 Output Format…………………………………………….
4. Adjustments and Settings
4-1 Model setting………………………………………………………..
4-2 Calibration…………………………………………………………..
4-3 Initialization…………………………………………………………
4-4 Resolution setting………………………………………………….
4-5 AD COUNT Value display and keyboard testing………………..
4-6 RTC setting………………………………………………………….
4-7 Setting Mode& Description of Parameter Values ………………
5. Trouble shootings
5-1 Preliminary checks…………………………………………………
5-2 Problems and solutions……………………………………………
5-3 Troubleshooting and Error Message…………………………….
6.Parts replacement
6-1 Load cell replacement……………………………………………..
6-2 Main board replacement…………………………………………..
6-3 Rechargeable battery replacement………………………………
6-4 RS232 replacement………………………………………………..
6-5 Keypad replacement……………………………………………….
6-6 LCD replacement…………………………………………………..
7. Applicable Version and Software…………………………………..
1
2
3
3
4
5
5
5
6
7
8
8
8
12
12
13
13
14
14
14
15
15
16
18
20
22
23
24
25
26
JADEVER SCALE CO., LTD
1.Assembly Drawing
1-1 Explosive view
JWE service manual
1
JADEVER SCALE CO., LTD
1-2 Part list
No.
Name
Quantity
Part Number
Material Number
1
stainless steel weighing pan
1
JWE-1
12-0003-0000XM
2
Plastic base
1
JWE-2
02-0000-1520XM
3
Dust shield
1
JWE-3
02-0007-0000XM
4
Backboard
1
JWE-4
20-1010-0300XM
5
Upper cover
1
JWE-5
02-0000-1500XM
6
Front panel
1
JWE-6
20-0909-0011XM
7
Keypad
1
JWE-7
21-0300-0202XM
8
LCD board
1
JWE-8
80-0136-1000XM
9
LOAD-CELL
1
JWE-9
10
Aluminum alloy support
2
JWE-10
10-0406-0000XM
11
Lower cover
1
JWE-11
02-0000-1510XM
12
Adjusting foot
4
JWE-12
01-0100-0006
13
Rechargeable battery
1
JWE-13
61-0201-0100XM
14
Battery cover
1
JWE-14
02-0000-1530XM
15
Battery protection screw
1
16
Power switch
1
JWE-16
60-0000-0000XM
17
Power socket
1
JWE-17
60-0503-0001XM
18
Transformer
1
JWE-18
61-0003-0101XM
19
Pull down protection
1
JWE-19
12-0700-0001XM
20
Overload protection
2
JWE-20
21
Leveler
1
JWE-21
02-0108-0004XM
22
Shipping protection
1
JWE-22
31-0404-0000XM
JWE service manual
2
JADEVER SCALE CO., LTD
2. Electronic Construction
2-1 PCB board wiring
2-2 Wiring configuration
JWE service manual
3
JADEVER SCALE CO., LTD
2-3 Circuit diagram
MCB2
MCB1
+5VA
BAT
AVS10
EH-Adpator
MCB5
U5 LM2930
TIP32
Q5 2
1
CN3
3
OUT
+5VD
GND
IN
R25
AVS11
+
1
2
R9 R10
470u/25v
330k,C
CP13
C13 0.1u
470u
R13 Battery
10k,A
R1
CP14
+
R26
2.2k,C
+5VD
C14 0.1u,G
470u,EL
100,A,T
AVS7
R2
2
100,A,T
3
4
C4
C5
100p
5
+5VA
6
CP9 C2
100p
7
C6
100p
104,G 1u,T
8
9
10
ANI1+
AIN2+ NC
20
AIN1-
AIN2- NC
19
C1
VREF+
C2
VREF-
VA+
DGND
18
16
A0
SDI
OSC2
SDO
OSC1
SCLK
Y1
R14
1k,C
237K,A,T
14
CS
A1
C10 CP11
1u,T 104,G
AD CS
13
AD SDI
12
AD SDO
11
SCLK
1
C7 R4 CP10
1u,T 237K 104,G
D2 LED-GR
Q2
C1815
R15
1k,C
+5VA
GND
3
R27
Q7 10k,C
2SC1815
ON/OFF
4.7k,C R20
R19 1k,C
4.7k,C
R17
3
OUT
CP15
1
U4
S80841CL
+
2
1N4148
1N4148
CN4
R16
1K,C
IN
D5
2
1
R3
+5VD
15
VD+
VA-
10k,C
+5VA
17
U6 LM2931
P2
14
13
12
11
10
9
8
NC
NC
CURLIM COMP
CURSEN V+
Vc
INVout
IN+
Vz
Nref
NC
V-
C1815
Q6
D4
3
2
Vss
U6
1
CP8
MCB8
CP6
1
2
3
4
5
6
7
R24
Out Vdd
0.1u,G
C15
470u,EL
ONF
3
0.1u,G
0.1u,G
MCB7
R23
47k,C
U3 LM723 470P
C12
2
CP7
2
CP5
1
0.1u,G
1
AVS8
0.1u,G
1
LOAD-CELL
2
5
MCB6
R12
1.5k,A
R18 Q4
100k A7333
3 Q3
1815
3
2
4
2/1w
2.2k,C 2.2k,C
3
2
C11 +
FB1
3
1
2
1N4004
R21
15k,C
1
S-
2
D313
4
D3
2
G
1
R22
3
1
E-
S+
MCB4
MCB3
J5
2
1
2
3
E+
1
Q1
2
D1
CN2
10u,T
AVS6
CN1
1
AVS9
C1
1
AVS5
5530
R8
C8 1M,C
20p
C9
20p
LCD2 JCE
LCD1 JCE
LCD3 JCE
12
+5VD
13
CP18
R52
1
U7
R28 R29 R30
0.1u,G 10K J7 4.7K 4.7K 4.7K
1
2
3
4
8
7
6
5
A0 VCC
A1 WP
A2 SCL
GND SDA
14
P3.2
15
16
17
2
AT24C02
R53
20K
SEMG12
SEMG11
SEMG13
17
16
15
SEMG9
SEMG8
SEMG7
SEMG6
SEMG5
SEMG4
SEMG3
SEMG1
SEMG2
SEMG10
14
12
13
11
8
9
7
6
10
COM3
COM1
COM2
COM4
4
5
3
1
2
SEMG13
17
SEMG11
SEMG10
SEMG9
SEMG7
SEMG8
SEMG6
SEMG5
SEMG3
SEMG4
SEMG2
SEMG1
COM3
COM4
COM2
COM1
SEMG12
16
14
15
13
12
10
11
9
8
7
6
5
4
3
1
2
SEMG13
SEMG12
16
17
SEMG9
SEMG10
SEMG8
SEMG7
SEMG5
SEMG6
SEMG4
SEMG3
SEMG11
15
14
12
13
8
9
7
11
10
SEMG1
COM4
COM3
COM1
SEMG2
6
4
5
1
AD SDO
40
P0. 3
P0.7
RST
U8
P3.0 / (RXD)
not EA / VPP
SM5964
P4.3
P4.1
ALE / not PROG
P3.1 / (TXD)
P3.2 / (not INT0)
PSEN
P3.3 / (not INT1)
P2.7
P3.4/(T0)
P2.6
P3.5/(T1)
P2.5
39
1
38
37
CAL
36
35
34
2
41
P0. 2
P0. 1
42
43
P0. 0
44
VCC
P0.6
+5VD
P4.1
R40
470.C
33
CN5
9
8
7
6
5
4
3
2
1
32
31
30
+5VD
P2. 0
11
RXD
P0.5
P1.7
29
R61
22K,C
P2. 4
R39
4.7k.C
P0.4
P1.6
P2. 2
10
P1.5
P2. 3
9
P2. 0
8
GND
7
P2
P4. 0
ONF
P1.7
XTAL
10u,EL
XTAL
C20
P3. 6 / (not WR)
AVS3
P3. 7 / (not RD)
C19
C17
3
SCLK
AD CS
P1. 4
2
3
4
5
6
1
P4. 2
P1. 0
P1. 1
P1. 2
+5VD
+5VD
AVS4
P1. 3
P1. 4
TXD
RS232
AD SDI
1
2
P4. 0
P1. 7
P4. 1
3
2
1
R7
10k,C
RXD
C44
C43
P3.2
CN10
4
3
2
1
C39
C42
AVS2
CN9
10K 10K 10K 10K 10K 10K 10K 10K
C41
R6
4.7k,C
C18
R31 R32 R33 R34 R35 R36 R37 R38
C40
Q11
A733
3
C16
AVS1
CP16
0.1u
2
BAT
P2. 1
+5VD
R5
10k,C
COM2
+5VD
JWE
LED1
7+
8
9+
10
11+
12
1
2
9
10
3
4
11
12
5
6
LED2
7+
8
R42
220Ω,C
JCE
7
8
7
8
9+
10
9
10
3
4
11+
12
11
12
5
6
LED LED
5
6+
R46 R47
1K,C 1K,C
D8
LED
R48
1K,C
D9
LED
R49
1K,C
D10
19
20
LED
21
R50
1K,C
SEG23
SEG24
IRQ
SEG25
31
BZ
SEG26
30
SEG27
29
COM0
SEG28
COM1
SEG29
23
COM2
COM3
13
14
15
16
18
19
20
21
22
17
SEGM9
SEGM11
SEGM12
SEGM13
SEGM10
SEGM8
12
33
VDD
BZ
SEGM6
35
34
VLCD
22
24
36
SEGM7
SEG21
SEG22
11
SEG20
OSC1
NO
HT1621B
OSC0
32
2
28
1
J4
27
2
SEG30
26
2
SEG31
25
J2
J3
1
1
C46 C47
+5VD
R45
1
2+
5
6+
18
D6 D7
3
4+
3
4+
17
2
J6
1
2+
JWE
1
2
B
A
1
16
Vss
9
13
14
15
10
14
NO
13
9
10
11
12
Y3
Y2
Y1
Y0
G
38
37
8
SEG19
SEGM14
SEG18
DATA
SEGM15
WR
LCD4 JWE
SEGM16
11
41
39
SEGM17
SEG17
42
40
SEGM18
SEG16
RD
43
SEGM19
CS
10
+5VD
P5.0 15
SEG15
9
DATA 12
Q9
2SC1815
SEG14
SEG0
SEGM2
WR
+5VD
SEG1
NO
U11 16
44
SEG13
SEGM1
CP17
0.1u,G
45
SEG12
SEG2
COM4
CS
U11 8
R40
470,C
SEG11
SEG3
COM2
+5VD
SEG10
SEG4
COM3
8
SEG5
7
7
46
5
6
48
47
6
JCE
5
SEG9
4
74LS139
4
SEG8
SEG6
3
11.059M C22
R41 20p
1M,C
3
SEG7
23
20p
B
A
2
24
2
C21
TP4
7
6
5
4
Y3
Y2
Y1
Y0
G
3
2
1
SEGM20
PRINT
1
Y2
9
8
7
6
5
4
3
2
1
COM1
P1. 4
U11A
1
2
1
U10
CN8
1
27
25
26
24
28
R62
2.2K,C
R63
10k,C
1
2
3
CN6
Q12
C1815
2
CN7
P2. 0
23
P4. 0
21
22
20
19
18
P5.0
+5VD
100k,C
R44
22k,C
Q10
A733
CP20
CP19
0.1u,G
0.1u,G
BZ1
1
2
Title
Size
A1
Date:
File:
JWE service manual
Number
B-SCALE V3.4
11-May-2009
E:\jadever\LX 资料档 \B 称.d b
Sheet of
Drawn By:
Revision
V3.4
4
JADEVER SCALE CO., LTD
3. RS-232 Communication
3-1 RS-232 circuit diagram
3-2 Single option
3-2-1 Scale to Printer
Scale to BP545D(TDP) printer
Scale to SH-24（TP）printer
Universal 25 pin (male) to 9 pin (male)
RS-232 connecting cable.
JWE service manual
5
JADEVER SCALE CO., LTD
Scale to ZEBRA printer
Scale to EZ printer
Universal 25 pin (male) to 9 pin (male)
RS-232 connecting cable.
Universal 25 pin (male) to 9 pin (male)
RS-232 connecting cable.
3-2-2 Scale to PC
1. Get receiving program ready on your computer.
2.Please set the print mode as “Prt.Co”(the scale will output the data to the PC
continuously)
Commonly used 9 female ~25male RS232 connecting wire.
Note: The hollow dots represent male connectors and the black dots represent female
connector.
JWE service manual
6
JADEVER SCALE CO., LTD
3-2-3 Scale to light tower
The pin of light tower
Picture
The light tower should be connected
to the 25-pin (male) socket.
Light tower to scale
Picture
That is commonly used 25pin port
(male) ~ 25 pin port (female) RS232
connecting wire.
Note: The hollow dots represent the
male connectors, while the black dots
represenst female connectors.
JWE service manual
7
JADEVER SCALE CO., LTD
3-2-4 Scale to PC and Light
Scale to PC and Light tower
Picture
Note: the hole dots represents
the male connectors, while the
black dots represent the female
connectors.
3-2-5 Scale to Printer and light tower
Scale to PC and
ZEBRA/GODEX(EZ)/B
P545D（TDP）
Picture
3-3 RS-232 Output Format
Baud Rate ： 2400、4800、9600
Data Bit
： 8
Parity
： N ( None )
JWE service manual
8
JADEVER SCALE CO., LTD
： 1
Stop Bit
： ASCII
Code
Bit Format ：
LSB
MSB
0
1
2
3
4
5
Start
Bit
6
7
8
Stop
Bit
Parity
Data Format
1. Kg
G/N/T
.
W
：
.
+/-
k
g
CR LF
weight
eg:
T.W.:
+ 1.000 kg
N.W.:
+ 1.000 kg
G.W.:
+ 2.000 kg
2.g
G/N/
T
.
W
.
：
+/-
g
CR LF
Weight
eg：
T.W. :
+
0.0
g
+ 1000.0
g
N.W. :
G.W. :
+ 1000.0
3、lb
G/N/
.
T
g
W
.
：
+/-
l
b
CR LF
Weight
eg:
T.W. :
+ 2.2050 lb
JWE service manual
9
JADEVER SCALE CO., LTD
N.W.:
+ 2.2050 lb
G.W.:
+ 4.4100 lb
4.台斤
G/N/
. W . ： +/T
-
G -
t
l
.
T
C
LF
R
-
G -
t
l
. H
C
LF
R
Weight
eg：:
T.W.:
+ 1-10.7G-tl.T
N.W.:
+ 1-10.7G-tl.T
G.W.:
+ 3- 5.3G-tl.T
5.港斤
G/N/
. W . ： +/T
Weight
eg：
T.W. :
+ 1-10.5G-tl.H
N.W. :
+ 1-10.5G-tl.H
G.W. :
+ 3- 4.9G-tl.H
6、斤
G/N/
.
T
W
.
：
+/-
C
-
J
i
n
CR LF
Weight
eg:
T.W. :
+ 2.0000 C-Jing
N.W. :
+ 1.9998 C-Jing
JWE service manual
10
JADEVER SCALE CO., LTD
G.W. :
+ 3.9998 C-Jing
7、lb/oz
G/N/
T
.
W
.
：
+/-
l
b
CR LF
Weight
eg：
T.W.:
+
0- lb 0.000 OZ
N.W.:
+
2- lb 3.280 OZ
G.W.:
+
2- lb 3.270 OZ
8、pcs
T
o
t
a
l
：
+/-
p
c
s
CR LF
pcs
eg：
Total：+ 645 pcs
9. %
+/-
%
C
R
L
F
%
eg.：
+ 24%
G
= GROSS
N = NET
JWE service manual
11
JADEVER SCALE CO., LTD
4. Adjustments and Settings
4-1 Model setting
1. Press and hold key TARE and ZERO while powering on the scale. The screen displays
“SET”
2. Press M+/MR and the screen will display “TW 3kg”
3. And then press MODE to select the format. (TW for Taiwan format; CN for standard format)
4. Press TARE to select the model
5. Press ZERO to save the setting. Press MC/SET to exit
Additional function setting
CAL jumper: 1 for open; 0 for close
Note: when the CAL circuit is shorted, single point calibration is forbidden.
4-2 Calibration
1. For best results, calibrate the scale at regular intervals. Temperature changes, geographic
gravity variations, altitude changes and abuse are few reasons why a scale may need
recalibration.
2. Here we take JWE-3K as an example.
Single Point Calibration
1）Press and hold key MODE while powering on the scale. The screen displays “CAL”, then
release the keys.
2）Press key TARE
to enter the zero point calibration mode.
3）Press key MODE to select calibration weight value. Options are1/3 of full load, 2/3 of full
load and full load. E.g., options for JWE-3K are 1, 2 and 3(kg).
4）Put the corresponding weights on the weighing pan, then the calibration procedure
starts.
5） The calibration procedure is completed with a beep and“
” flashing. Now, remove all
the weights.
6）Press key ZERO+ to return to weighing mode, key MODE to advance to next setting
menu.
JWE service manual
12
JADEVER SCALE CO., LTD
Linear Calibration
1）Press and hold key TARE
while powering on the scale. The screen displays
, then
release the keys.
2) Press key MODE to enter the zero point calibration mode.
3) Wait till
appears, put weights of 1/3 of full load on the weighing pan and press down
key TARE
4) Wait till
TARE
5) Wait till
E.g., for JWE-3K ,1/3 of full load is 1kg.
appears, and then put weights of 2/3 of full load on pan and press down key
E.g., for JWE-3K, 2/3 of full load is 2kg.
appears, then put weight of full load on and press TARE
E.g., for
JWE-3K, full load is 3kg.
6) The calibration procedure ends up with a symbol of “PASS”.
7) Remove all the weights, and then press key ZERO+ to return to weighing mode.
4-3 Initialization
1. Press and hold key TARE and ZERO while powering on the scale. The screen will display
“SET”
2. Press key MODE, and the screen will display “FACT”
3. Press and hold key M+/MR and TARE to start linear calibration
4. Press ZERO to go back to weighing mode
4-4 Resolution setting
1. Press and hold key M+/MR while powering on the scale
2. Press key MC/SET, MODE, TARE one by one. And the screen will display “SENC”
3. Press TARE to select 1 or 2. (1 for 1/15000; 2 for 1/30000)
4. Press ZERO to save and return
JWE service manual
13
JADEVER SCALE CO., LTD
4-5 AD COUNT Value display and keyboard testing
5
Press and hole key M+/MR and MODE while powering on the scale. The screen will
display “POS3”
6
Press ZERO to enter weighing mode. Press others key to conduct keyboard testing
Press M+/MR, the screen will display “LO”
Press MC/SET, the screen will display “OK”
Press MODE, the screen will display “HI”
Press TARE, the screen will display the battery symbol
4-6 RTC setting
1. Press and hold key MC/SET while powering on the scale. After the self-test is finished, the
screen displays nothing.
2. Release MC/SET, and the screen displays the time
-
3. Press MODE to switch between date and time.
4. Press TARE to move the digit place
5. Press ZERO to change the details
6. Press MC/SET to exit.
4-7 Setting Mode& Description of Parameter Values
Setting Mode
1) Long-press key MODE while powering on the scale to enter setting mode. The screen
displays “CAL”, then release the keys.
2) Press key MODE to circle through setting modes.
3) Press key M+/MR to choose function.
4) Press key MC/SET switch on and off the chosen function. Press key ZERO+ to save the
setting and back to the weighing mode. If more settings are needed, press key MODE again.
JWE service manual
14
JADEVER SCALE CO., LTD
Description of Parameter Values
1)
Calibration See “7. Calibration”
Set the active weight unit. The following setting are available:
2)
kg, g, lb, lb-oz,斤, 台斤, 港斤,pcs and % .
3)
(Enable);
(disable)
Set the init weight unit. The following setting are available:
kg, g, lb, lb-oz,斤, 台斤, 港斤,pcs and %.
4)
(Enable);
(Disable)
Set the filtering level in which the stable indication turns on .The higher the setting,
the slower stabilization time. Options are Fil 1,Fil 2,Fil 4 and Fil 8.
5)
Set the period of inactivity before the scale automatically turns off. Options are
Aut.NO=non power-off,Aut.5, Aut.10, Aut.30 and Aut.60(minutes).
6)
Set the activation mode of backlight. Options are lit.Aut=Auto on with items greater
than 9d placed on the weighing pan, lit.ON = Backlight on and lit.OFF=Backlight off.
7)
Set zero display range. Options are Zero.0(one division) , Zero.1(2 divisions),
Zero.2(3 divisions), Zero.3(4 divisions), Zero.4(5 divisions) and Zero.5(6 divisions) .
8)
Set RS-232 Serial Transmission Rate. Options are bAu.96(9600), bAu.48(4800) and
bAu.24(2400)
9)
Set Print mode .Options are Prt.Pr(manual print), Prt.St(Stable print) and
Prt.Co(Continuous print)
Note:
In the continuous print mode, computer will be automatic chosen as the external device.
10)
→
Set external Interface. Options are PC, SH, ZEBRA,TP, AX, EZ2-S and
tdp-643.
11)
Set Weight checking memory.
(Enable);
(Disable )
12)
Set Weight checking buzzer beep. Options are beep.Un, beep.IN, beep.NO and
beep.LO.
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13)
Set RTC Function.
(Enable);
(Disable)
5. Trouble shootings
5-1 Preliminary checks
Is the bubble of the level indicator at the center?
Is the battery electricity capacity ok?
Is power cord connected both with the scale and with the outlet properly?
Is the weighing pan the right one?
Is there anything under the weighing pan?
Is the scale at a flat and steady base?
Are there any vibrating, rotating, and/or reciprocating equipment around?
5-2 Problems and solutions
Problem
Power on failure
Possible Cause
Basic Inspection and troubleshooting
Lead-acid battery defective
Make sure there is no bad connection of
the battery connection and the voltage is
above 5.8V. Remove battery and power on
by using charging transformer to see if the
failure is due to battery defect.
Charging transformer problem
Please try a normal charging transformer
to see if the scale can be powered on.
LCD or related LCD circuit fault
After confirming that there is no broken
board line or short circuit of connection
between LCD and other conducting
objects, please replace LCD.
Replacement is needed.
CPU / Crystal11.0592M
(oscillating circuit) fault
Power circuit fault
Please check the working voltage of CPU
(pin44) / LM2930 / B857 / Q7 /
U4*S80841AL, then replace the one which
working voltage is abnormal.
I/O switch fault
Replacement is needed
Charging Failure Lead-acid battery defective
Charging transformer problem
Remove battery and power on by using
charging transformer to see if the failure is
due to battery defect.
Please try a normal charging transformer
to see if the scale can be powered on.
Components or power circuit 1. Fuse burn down, replacement is
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defective
required.
2. Please check D2/D313/LM723/
rectifier, then replace the defective one.
3. Charge lamp defective, replacement is
required.
4. The polarity or the charging lamp is
reversed.
Poor
Display
LCD LCD defective
After confirming that there is no broken
board line or short circuit of connection
between LCD and other conduction
objects, please directly replace LCD.
Component or part defective
Please check / replace U10(HT1621B)
Incorrect
weighing
Component or part defective
Please check / replace AD5530/4.9152M
Load cell Malfunction
Replacement is required
Buzzer
does not work
Component or part defective
Please check / replace CPU/Q7
Keypad
dysfunction
Keypad or keypad circuit fault
Check/replace keypad or keypad circuit.
CPU/CPU program effective
Check/replace CPU
Memory
dysfunction
Power circuit fault
Please check R28/29/30/CP18 and make
sure there is no shortcut
CPU/CPU program effective
Check/replace CPU
Component or part defective
Please check / replace U7
BUZZER defective or
circuit fault
buzzer Replacement is required
Print dysfunction Wrong setting
Please check /reset external device/ baud
rate/print mode
RS-232 board defective
Please check/replace RS-232 board.
Bad
connection
between Please check/replace the wire connection
RS-232 board and main board
Defective in external device
Maintenance/replacement is need.
Battery symbol
Insufficient cell voltage
Rechargeable battery failure
Component defective
CPU/CPU program effective
LCD backlight Wrong setting
no function
LCD backlight defective
Component defective
Please recharge the battery
If the voltage of the battery is lower than
5.7V and the battery indication lamp is still
in green color, please immediately replace
the rechargeable battery.
Please check/replace R3/R4/AD5530
Check/replace CPU
Please check/ reset the backlight function
Replacement is required
Please check/replace Q9 / Q11
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5-3 Troubleshooting and Error Message
Error message Problems
Solutions
Initial zero point exceeds ＋
/-30% (take 10% as reference
basis)
1. Check whether there are other alien
articles on the scale pan, remove those
articles. 2. LOAD CELL failure, which
requires to be changed or to contact our
Service.
Higher or lower than A/D
resolution range.
1. Check whether it is A/D failure, if yes,
please replace AD.
2. LOAD CELL failure, replacement is
required or contact our Service.
EEPROM Chksum failure
Re-sold EEPROM or contact our Service.
Overload condition
Remove weight that is greater than the
scale capacity from the pan.
Wrong calibration weights
Calibrate with the correct calibration
weights or contact service
Accumulated number of
1. No more accumulations.
weighments(max: 99 pieces) or 2. Reset the Tare value.
weight exceeds the display
range.
Low battery
Recharge the battery. The scale can be
used while it is recharging.
6.Parts replacement
6-1 Load cell replacement
1.Remove the upper cover
2.Remove the 4 fixing screws of the L/C
support
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3.Remove L/C support
4.Disconnect the L/C wire from the main board
by soldering iron
5.Remove the fixing screws of
upper L/C support
6.Remove the upper support
7.Remove the fixing screws of
lower L/C support
8.Replace the L/C and tighten the
screws of support
9.Solder L/C wire to the main board
and connect all the connectors
10.Insert the keypad
Scale grinding
A. First switch on the scale and conduct a calibration.
B. Use weights of 1/3 full load to test the 4 corners and record the shown values.
C. Use a file to grind the “Scale grinding point” corresponding to the lowest display value out of
the four corners.(when grinding for the first time, please test force by means of trial grinding with
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small strength so as the avoid damage to L/C), after grinding, press ZERO key to measure the
four corners again.
D. Repeat step B-C until the difference between the four corners and the center is
±1 division, then recalibrate the scale.
E: After grinding the scale, if there are still big differences in the displayed weighing between the
4 corners and center of the scale, it means malfunction in L/C.
F: Pay attentions to L/C specification when grinding, the smaller max.Capacity, and the weaker
grinding force.
Model
JWE-3K
JWE-6K
JWE-15K
JWE-30K
LC Capacity (ZEMIC)
5Kg
10Kg
20Kg
40Kg
LC Capacity (MAVIN)
4.5Kg
7.5Kg
20Kg
45Kg
6-2 Main board replacement
1.Remove the weighing pan
2.Upside down the scale and remove
the 7 fixing screws
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3.Remove the keypad. Disconnect
all the connectors
4. Remove the 2 fixing screws of
the main board
5.Paste a protection film on the LCD
6.Upside down the main board and
disconnect the L/C wire by soldering
iron
7.Replace the new main board and
connect L/C wire by soldering iron.
8.Tare away the protection film
of the LCD
9.Tighten the 2 fixing screws and
then connect all the connectors
10.Put on the cover and tighten
the 7 fixing screws
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11.Put on the weighing pan
Note:
1) ZEMIC and MAVIN Load cell:“E+”in red, “E-”in black, “S+”in green ,and “S-”in while
2) Tedea load cell: “E+”in green, “E-”in black, “S+”in red ,and “S-”in while
6-3 Rechargeable battery replacement
1.Remove the weighing pan
2.Upside down the scale and remove
the fixing screw of the battery cover
3.Remove the battery cover
5.Replace the battery
4.Remove the battery
6. Put the battery back as the picture
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7. Put on the battery cover and
Tighten the fixing screw
8.Put on the weighing pan
6-4 RS232 replacement
1.Remove the upper cover
2.Remove the 4 fixing screws of the
support
3.Remove the L/C module
4.Remove the fixing screws of RS232
board
5.Disconnect the wire and replace
the RS232 board
6.Tighten fixing screws of RS232 and
connect the wire
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6-5 Keypad replacement
1.Remove the weighing pan
2. Upside down the scale and
remove the 7 fixing screws
3.Open the upper cover
4.Disconnect the keypad
5.Remove the upper cover and
tear down the keypad
6.Clear the defective gum and tear
away the release paper of new keypad
7. Paste the new keypad to the cover
8. Connect the keypad to the main board
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9.Put on the upper cover and do
the key testing
10.Upside down the scale and
tighten the 7 fixing screws
11.Put on the weighing pan
6-6 LCD replacement
1.Cut away the LCD
2.Remove the bad LCD
3.Punch the welding spot
4.Install the new LCD
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5.Tin-plaste for the new LCD. Pay
much attention to the welding spot
6.Finish
7. Applicable Version and Software
Version:02
Revision date: May 14, 2009
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