Jadever JWE User manual

JWE Series
Service Manual

Content
1.Assembly Drawing
1-1 Explosive view………………………………………………………
1-2 Part list………………………………………………………………
1
2
2. Electronic Construction
2-1 PCB board wiring…………………………………………………..
2-2 Wiring configuration………………………………………………..
2-3 Circuit diagram……………………………………………………..
3
3
4
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…………………………………………….
5
5
5
6
7
8
8
8
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 ………………
12
12
13
13
14
14
14
5. Trouble shootings
5-1 Preliminary checks…………………………………………………
5-2 Problems and solutions……………………………………………
5-3 Troubleshooting and Error Message…………………………….
15
15
16
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…………………………………………………..
18
20
22
23
24
25
7. Applicable Version and Software…………………………………..
26

JADEVER SCALE CO., LTD
JWE service manual
1
1.Assembly Drawing
1-1 Explosive view

JADEVER SCALE CO., LTD
JWE service manual
2
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

JADEVER SCALE CO., LTD
JWE service manual
3
2. Electronic Construction
2-1 PCB board wiring
2-2 Wiring configuration

JADEVER SCALE CO., LTD
JWE service manual
4
2-3 Circuit diagram
Title
Num ber RevisionSize
A1
Dat e: 11-May-2009 Sheet of
File: E:\jadever\LX 资料档 \B 称.dd b Drawn By:
1
2
CN6
PRINT
R48
1K,C
AVS2
COM1
1
COM2
2
COM3
3
COM4
4
SEMG1
5
SEMG2
6
SEMG3
7
SEMG4
8
SEMG5
9
SEMG6
10
SEMG7
11
SEMG8
12
SEMG9
13
SEMG10
14
SEMG11
15
SEMG12
16
SEMG13
17
LCD3
2
3
1
Q3
1815
R32
10K
R33
10K
C16
AVS3
AVS9
AVS4
C17
1
2
BZ1
R38
10K
Y2
11.059M
R44
22k,C
R34
10K
R49
1K,C
CP14
0.1u,G
R21
15k,C
SEG7
1
SEG6
2
SEG5
3
SEG4
4
SEG3
5
SEG2
6
SEG1
7
SEG0
8
CS
9
RD
10
WR
11
DATA
12
Vss
13
OSC0
14
OSC1
15
VLCD
16
VDD
17
IRQ
18
BZ
19
BZ
20
COM0
21
COM1
22
COM2
23
COM3
24 SEG31 25
SEG30 26
SEG29 27
SEG28 28
SEG27 29
SEG26 30
SEG25 31
SEG24 32
SEG23 33
SEG22 34
SEG21 35
SEG20 36
SEG19 37
SEG18 38
SEG17 39
SEG16 40
SEG15 41
SEG14 42
SEG13 43
SEG12 44
SEG11 45
SEG10 46
SEG9 47
SEG8 48
U10
HT1621B
AVS1 1
1
2
3
4
CN9
RS232
CP20
0.1u,G
R25
330k,C
12
J4
A
14 B
13
G
15
Y0 12
Y1 11
Y2 10
Y3 9
D10
LED
P4. 2 1 P1. 0 2 P1. 1 3 P1. 2 4 P1. 3 5 P1. 4 6
P1. 5
7
P1. 6
8
P1. 7
9
RST
10
P4. 3
12
P3.0 / (RXD)
11
P3.1 / (TXD)
13
P3.2 / (not INT0)
14
P3.3 / (not INT1)
15
P3.4/(T0)
16
P3.5/(T1)
17
P3.6/ (not WR)
18
P3.7/ (not RD)
19
XTAL
20
XTAL
21
GND
22
P4. 0
23
P2. 0
24
P2. 1
25
P2. 2
26
P2. 3
27
P2. 4
28
P2. 5 29
P2. 6 30
P2. 7 31
PSEN 32
ALE / not PROG 33
P4. 1 34
not EA / VPP 35
P0. 7 36
P0. 6 37
P0. 5 38
P0. 4 39
P0. 3 40 P0. 2 41 P0. 1 42 P0. 0 43
VCC 44
U8
SM5964
1
2
3
4
5
6
7
8
9
CN5
JWE
D5
1N4148
CP17
0.1u,G
D4
1N4148
R23
47k,C
Q10
A733
D6
LED
C40
R31
10K
1
3 2
Q5
TIP 32
R12
1.5k,A
1
2
3
4
5
6
7
8
9
CN8
JCE
AVS1
R26
2.2k,C
R19
4.7k,C
12 J2
R45
100k,C
+
C13
470u
2
1
3
Q1
D313
R22
2/1w
R35
10K
C41
C20
10u,EL
1
2
CN4
ON/OFF
R41
1 M, C
R20
1k,C
A
2B
3
G
1
Y0 4
Y1 5
Y2 6
Y3 7
U11A
74LS139
R30
4.7K
R14
1k,C
C46
A0
1
A1
2
A2
3
GND
4SDA 5
SCL 6
WP 7
VCC 8
U7
AT24C02
D8
LED
R18
100k
COM1
1
COM2
2
COM3
3
COM4
4
SEMG1
5
SEMG2
6
SEMG3
7
SEMG4
8
SEMG5
9
SEMG6
10
SEMG7
11
SEMG8
12
SEMG9
13
SEMG10
14
SEMG11
15
SEMG12
16
SEMG13
17
LCD1
R10
2.2k,C
CP15
0.1u,G
R24
10k,C
12
CAL
R29
4.7K
R27
10k,C
COM1
1
COM2
2
COM3
3
COM4
4
SEGM1
5
SEGM2
6
NO
7
NO
8
NO
9
SEGM6
10
SEGM7
11
SEGM8
12 SEGM9 13
SEGM10 14 SEGM11 15 SEGM12 16 SEGM13 17 SEGM14 18 SEGM15 19 SEGM16 20 SEGM17 21 SEGM18 22 SEGM19 23 SEGM20 24
LCD4
1
2
CN3
Battery
IN
1OUT 3
GND
2
U6 LM2931
R46
1K,C
R16
1K,C
C43
R42
220Ω,C
3
1 2
Q7
2SC1815
+
C11
470u/25v R13
10k,A
C18
3
1 2
Q6
C1815
R47
1K,C
R15
1k,C
Q9
2SC1815
R40
470,C
C12
470P
R9
2.2k,C
D3 1N4004
12
J3
C44
CP19
0.1u,G
C21
20p
R36
10K
R50
1K,C
2
3
1
Q4
A733
NC
1
CURLIM
2
CURSEN
3
IN-
4
IN+
5
Nref
6
V-
7NC 8
Vz 9
Vout 10
Vc 11
V+ 12
COMP 13
NC 14
U3 LM723
D9
LED
C47
COM1
1
COM2
2
COM3
3
COM4
4
SEMG1
5
SEMG2
6
SEMG3
7
SEMG4
8
SEMG5
9
SEMG6
10
SEMG7
11
SEMG8
12
SEMG9
13
SEMG10
14
SEMG11
15
SEMG12
16
SEMG13
17
LCD2
1 2
J6
1
2
CN2
EH-Adpator
C19
11
22+
33
44+
55
66+
7
7+
8
8
9
9+
10
10
11
11+
12
12
LED2
AVS1 0
R28
4.7K
CP13
0.1u
1 2
TP4
R40
470.C
D7
LED
IN
1OUT 3
GND
2
U5 LM2930
CP18
0.1u,G
R37
10K
12
J5
C42
D2 LED-GR
R39
4.7k.C
R17
4.7k,C
C22
20p
2
3
1
Q2
C1815
CP16
0.1u
SCLK
TXD
RXD
AD CS
P3. 2
RXD
AD SDI
AD SDO
ONF
P1. 7
P1. 4
P4. 0
P1. 4
+5VD
+5VD
+5VD
+5VD
+5VD
+5VD
BAT
+5VD
+5VD
+5VD
B-SCALE V3.4
V3.4
1
2
3
4
D1
+
C14
470u,EL
+
C15
470u,EL
+5VD
+5VA
ONF
P1. 7
P2
P4. 0
P2
U11 16
U11 8
+5VD
+5VD
Vss
3
Out
1Vdd 2
U4
S80841CL
R53
20K
R52
10K
12
J7
WR
DATA
CS
P4. 1
P4. 1
1
2 3
CN10
C10
1u,T
Y1
CP11
104,G CP10
104,G
R4
237K
R8
1 M, C
C7
1u,T
C9
20p
C8
20p
R3
237K,A,T
+5VD
+5VA
CP9
104,G
+5VA
C2
1u,T
ANI1+
1
AIN1-
2
C1
3
C2
4
VA+
5
VA-
6
A0
7
A1
8
OSC2
9
OSC1
10 SC LK 11
SDO 12
SDI 13
CS 14
VD+ 15
DGND 16
VREF- 17
VREF+ 18
NC 19
NC 20
U6
5530
C6
100p
C4
100p
AIN2-
AIN2+
C5
100p
SCLK
AD SDI
AD SDO
AD CS
MCB6
FB1
E+ 1
G3
E- 2
S+ 4
S- 5
CN1
LOAD-CELL
R2
100,A,T
MCB7 MCB8
CP5
0.1u,G
AVS5
MCB1
CP6
0.1u,G
AVS6
CP7
0.1u,G
AVS7
CP8
0.1u,G
AVS8
MCB2
MCB3 MCB4
MCB5 R1
100,A,T
+5VA
C1
10u,T
R5
10k,C
3
12
Q11
A733
R6
4.7k,C
R7
10k,C
BAT+5VD
P3. 2
C39
P2. 0
1
2
3
CN7
P5. 0
R63
10k,C
+5VD
P2. 0
P5. 0
R62
2.2K,C
Q12
C1815
R61
22K,C
11
22+
33
44+
55
66+
7
7+
8
8
9
9+
10
10
11
11+
12
12
LED1
JWE
JCE
JWE
JCE JCE JCE

JADEVER SCALE CO., LTD
JWE service manual
5
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.

JADEVER SCALE CO., LTD
JWE service manual
6
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.

JADEVER SCALE CO., LTD
JWE service manual
7
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.

JADEVER SCALE CO., LTD
JWE service manual
8
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 )

JADEVER SCALE CO., LTD
JWE service manual
9
Stop Bit ：1
Code ：ASCII
Bit Format ：
LSB MSB
0 1 2 3 4 5 6 7 8
Start
Bit Parity Stop Bit
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
N.W. :
+ 1000.0 g
G.W. :
+ 1000.0 g
3、lb
G/N/
T. W .
：
+/- l b CR LF
Weight
eg:
T.W. :
+ 2.2050 lb

JADEVER SCALE CO., LTD
JWE service manual
10
N.W.:
+ 2.2050 lb
G.W.:
+ 4.4100 lb
4.台斤
G/N/
T .
W .
：
+/-
- G - t l . T C
R LF
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/
T .
W .
：
+/-
- G - t l . H C
R LF
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

JADEVER SCALE CO., LTD
JWE service manual
11
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

JADEVER SCALE CO., LTD
JWE service manual
12
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.

JADEVER SCALE CO., LTD
JWE service manual
13
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 E.g., for JWE-3K ,1/3 of full load is 1kg.
4) Wait till appears, and then put weights of 2/3 of full load on pan and press down key
TARE E.g., for JWE-3K, 2/3 of full load is 2kg.
5) Wait till 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

JADEVER SCALE CO., LTD
JWE service manual
14
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”
PressTARE, 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.

JADEVER SCALE CO., LTD
JWE service manual
15
Description of Parameter Values
1) Calibration See “7. Calibration”
2) Set the active weight unit. The following setting are available:
kg, g, lb, lb-oz,斤, 台斤, 港斤,pcs and % . (Enable); (disable)
3) Set the init weight unit. The following setting are available:
kg, g, lb, lb-oz,斤, 台斤, 港斤,pcs and %. (Enable); (Disable)
4) 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.

JADEVER SCALE CO., LTD
JWE service manual
16
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 Possible Cause Basic Inspection and troubleshooting
Power on failure
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
be
tween LCD and other conducting
objects, please replace LCD.
CPU / Crystal11.0592M
(oscillating circuit) fault
Replacement is needed.
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
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.
Components or power circuit
1. Fuse burn down, replacement is

JADEVER SCALE CO., LTD
JWE service manual
17
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 LCD
Display
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
BUZZER defective or buzzer
circuit fault Replacement is required
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
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
RS-232 board and main board
Please check/replace the wire connection
Defective in external device Maintenance/replacement is need.
Battery symbol Insufficient cell voltage Please recharge the battery
Rechargeable battery failure
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.
Component defective Please check/replace R3/R4/AD5530
CPU/CPU program effective Check/replace CPU
LCD backlight
no function Wrong setting Please check/ reset the backlight function
LCD backlight defective Replacement is required
Component defective
Please check/replace Q9 / Q11

JADEVER SCALE CO., LTD
JWE service manual
18
5-3 Troubleshooting and Error Message
6.Parts replacement
6-1 Load cell replacement
1.Remove the upper cover 2.Remove the 4 fixing screws of the L/C
support
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 thanA/D
resolution range. 1. Check whether it isA/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
weighments(max: 99 pieces) or
weight exceeds the display
range.
1. No more accumulations.
2. Reset the Tare value.
Low battery
Recharge the battery. The scale can be
used while it is recharging.