Vetek JWL-1 User manual

Vetek Weighing AB

www.vetek.com

JWL Service Manual

May not be reproduced in any form without written permission

PAGE

JWL Series

Service Manual

Vetek Weighing AB

www.vetek.com

JWL Service Manual

May not be reproduced in any form without written permission

PAGE

Contents

Assembly drawing

1 – 1

Explosive view (JWL) 2

1 – 2

List of parts (JWL) 3

1 – 3

Block diagram of electronic structure 4

1 – 4

Wiring diagram 5

2. Troubleshooting procedure 6

2 – 1

Troubleshooting flow 6

2 – 2

Troubleshooting table 7

2 – 3

Confirmation of application environment 7

2 – 4

Simple inspection of electric circuit 8

2 – 5

Performance inspection 8

3. Maintenance and setting 9

3 –

Maintenance flow 9

3 –

Model setting 9

4. Setting of parameters 10

4 – 1

Parameter setting 10

4 – 2

Description of parameter values 11

4 – 3

Unit setting 13

5. Linear calibration 17

6. Single point calibration 19

7. Error message list 21

8. External interface 22

8 – 1

RTC function setting 22

8 – 2

Signal output pins of three-in-one board 24

8 – 3

Single option 24

8 – 4

Two options 34

8 – 5

RS232 output format 36

9. Others 38

10. Circuit diagram 41

10 – 1

CPU, peripheral and other circuits 41

10 – 2

LCD circuit 42

10 – 3 Applicable mainboard version and software version 42

Vetek Weighing AB

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JWL Service Manual

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1. Assembly Drawing

1 – 1 Explosive view

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JWL Service Manual

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1-2 List of parts

No. Name Quantity Part No.

Material No.

1 xm JWL-

Chinese

front panel

1 JWL-1 21-1925-0100

2 xm key 1 JWL-2 21-0506-0100

3 xm level meter 1 JWL-3 02-0108-0003xm(14mm)

4 Xm transformer 1 JPL-4 61-0003-0400

5 Xm switch 1 JWL-5 60-0000-0000xm

6 Xm power socket 1 JWL-6 80-0125-0000

7 xm semi-

finished

JWL board

1 JPL-7 60-0503-0001xm

8 Xm lower cover 1 JWL-8 02-0000-6020

9 xm lower support 1 JWL-9 10-0425-0100

Xm screw for

transport protection

1 JPL-10

31-0404-0000xm

11 Xm rubber levelers 4 JWL-11

01-0100-0030

12 xm RS232 board 1 JCL-12

80-0900-2200xm

13-1

xm sensor -

Chung

Yuen 3k

1 JWL-13

51-0400-0400xm

13-2

xm sensor -

Chung

Yuen 5k

1 JWL-13

51-0410-0000

13-3

xm sensor-

Chung

Yuen 10k

1 JWL-13

51-0410-0010

13-4

xm sensor -

Chung

Yuen 20k

1 JWL-13

51-0410-0020

13-5

xm sensor -

Chung

Yuen 40k

1 JWL-13

51-0410-0040

14 Xm storage cell 1 JWL-14

61-0201-0098xm

15 Xm cell cover 1 JWL-15

02-0000-6030

16 Xm rear PCB 1 JPL-16

80-0126-0010

17 xm upper support 1 JWL-17

10-0425-0000

18 xm upper cover 1 JWL-18

02-0000-6010

19 xm rear panel 1 JWL-19

20-0000-6040

xm plastic

down-warped pan

1 JCL-20

02-0000-6040

xm stainless steel

down-warped pan

1 JCL-21

12-0000-1200

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JWL Service Manual

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1 – 3 Block diagram of electronic structure

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JWL Service Manual

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1 – 4 Wiring diagram(圖中中文應去除)

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JWL Service Manual

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2. Troubleshooting Procedure 2– 1 Troubleshooting flow

START

LED act

or not

LCD, backlight, buzzer,

LCD displays completely or not

Yes

Confirm application environment

LCD display status

Cannot zero or

STABLE flashes

LCD display Err5

Display weight

Check for AD

internal

COUNT value

Replace machine board

and repair

Yes

Adjust AD value

Transport protecti

screw

is disassembled or not

Object interference exists

near scale pan or not

Remove interfering object

Yes

Recalibrate zero point

Remove transport protector

eturn to START

Yes

eturn to START

Zero point, weighing

is stable or not

Keys are normal or not

Yes

Weight display

can display to

MAX+9e or not

Yes

Weight is accurate or not

Yes

Linearity is good or not

Can weigh or not

Yes

Unbalanced load is normal or not

Residual creep exists

or not

Yes

Replace machine board, and repair

or replace LOAD-CELL

eturn to START

eplace

machine board,

and repair,

interference

exists or not

eturn to START

Can z

ero or not

Yes

Check AD COUNT

value for instability,

replace machine

board, and repair,

interference exists or

not

eturn to START

Check machine board or

replace

KEYBOARD

eturn to START

Replace machine board and repair

eturn to START

Linear calibration

eturn to START

Correct error at the

four corners

eturn to START

Check LOAD

ELL

for failure

Return to START

Yes

Performance and function test

Check battery wiring

for loosening

Check power supply

switch for failure

Connect battery wiring

Return to START

Yes Check battery or

damage or power

ailure

Charge or replace battery

Yes

Can it work or be charged

with AC power supply

Charge or replace

battery

Yes

Check transformer for

damage

Return to START

Yes

eturn to START

Replace power supply

switch

eturn to START

Yes

board or replace it

eturn to START

Check

repair machine

board or replace it

Return to

START

Replace transformer

Return to START

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JWL Service Manual

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2– 2 Troubleshooting table

Error message

Causes

LCD,

backlight board

buzzer

does not work

1. Cell or transformer fault

2. Power switch fault

3. Power circuit fault

4. LCD or related LCD circuit fault

5. Backlight board or backlight related circuit fault

6. Buzzer fault or buzzer circuit fault

7. CPU or oscillating circuit fault

AC current or

cell can’t be

used.

1. Power socket fault

2. Transformer fault

3. Cell fault

4. Power circuit fault

5. Main board fault

Err5 1. Overload (max weighing +9e)

2. Too high or inaccurate calibrated COUNT value.

Cell sign 1. Insufficient cell voltage or cell failure

2. Main board fault

Instable

indication

1. The pan is interfered by any article.

2. There is strong wind or vibration nearby.

3. The cell voltage is insufficient.

4. There is external electromagnetic interference.

Bad linearity 1. The pan is interfered by any article.

2. Bad L/C

2– 3 Confirmation of the application environment

a. Is there a strong wind in the workplace?

b. Is there vibration or instability in the workplace?

c. Is there any article on the pan?

d. Is the stainless steel pan placed on the tray?

e. Has the screw for transport protection been removed?

f. Is the scale set on a horizontal plane?

2 –4 Simple inspection of electric circuit

a. Check if the power supply is normal

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JWL Service Manual

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1. Is the voltage 5V at both E+ and E- terminals? Check whether the CPU supply is normal.

b. Check the signal input

1. Check if the outputs from S+ and S- terminals to G change in accordance with the weight on

the pan.

c. Check the digital signals

(1) Check if there is oscillation in Y1’s output pin.

(2) Check if there is oscillation in Y2’s output pin.

2 – 5 Performance Inspection

a. Repetitiveness

Put the weight of two thirds of the load on the pan for five times , the indication difference

between different times should be less than or equal to one division value.

b. Unbalanced loading error

Put the weight of one third of the load on the pan (as shown in the figure). Check if the figure is

precise. The indication difference between the four corners should be less than or equal to one

division value.

c. Linearity

Load conditions Permissible error

Idle ~ one third of the load 0 e

One third of the load ~ two thirds of the load 1 e

Two thirds of the load ~ full load 2 e

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JWL Service Manual

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3. Maintenance and Setting

3 – 1 Maintenance flow

3 –2 Model setting

Model setting: Press MR to turn on the unit (the LCD will display 3.0000) and then press UNIT

to select the unit model (for example:1.50000, 3.0000, 6.0000, 7.5000, 15.0000, 30.000 ).

Press G/N and the unit will display “dIu-01” and enter accuracy selection. Press UNIT to

select from diu-01 (1/30000), diu-02 (1/15000), diu-03(1/6000), diu-04 (1/3000), etc. and then

press G/N to store the setting and return to the weighing mode.

Refer to Page 9

Refer to Page 17

Refer to Page 19

Refer to Page 10

Refer to Page 8

Change LOAD-CELL

Model setting

Linear calibration

Single point calibration

Parameter setting

Performance inspection

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