A&D GX-A Series User manual

GX- 203A/303A/403A/603A/1003A/1603A
2002A/3002A/4002A/6002A/10002A
6001A/10001A
GF- 123A/203A/303A/403A/603A/1003A/1603A
1202A/2002A/3002A/4002A/6002A/10002A
6001A/10001A
1WTPD4003782

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GX-A/GF-A Maintenance manual
Page 1
Contents
1. INTRODUCTION...................................................................................................... 2
1.1 EQUIPMENTAND TOOLS REQUIRED.......................................................................................................2
2. PRINCIPLES OF OPERATION................................................................................ 4
2.1 CORRECTIVE MAINTENANCE OUTLINE...................................................................................................5
3. PERFORMANCE TEST........................................................................................... 6
3.1 PERFORMANCE TEST PROCEDURE .......................................................................................................6
3.2 TEST DETAILS......................................................................................................................................7
4. CORRECTIVE MAINTENANCE .............................................................................11
4.1 TROUBLESHOOTING TABLE .................................................................................................................11
4.2 MAINTENANCE FLOWCHART............................................................................................................... 16
5. FORCE MOTOR DISASSEMBLY AND REASSEMBLY........................................ 17
5.1 DISASSEMBLY................................................................................................................................... 18
5.2 ASSEMBLY........................................................................................................................................ 20
5.3 CLEANING THE MAGNETASSEMBLY AND BOBBIN................................................................................. 25
6. ADJUSTMENTS .................................................................................................... 26
6.1 ADJUSTMENT FLOW CHART............................................................................................................... 26
6.2 GENERAL PRECAUTIONS ................................................................................................................... 27
6.3 CHECK MODE................................................................................................................................... 28
6.4 CHECK MODE MENUS ....................................................................................................................... 30
6.5 INITIALIZATION................................................................................................................................... 31
6.6 M ODEL TYPE S ELECTION (O NLY FOR MAINTENANCE ELECTRIC BOARD ) ........................................................... 32
6.7 COARSE OPERATION CHECK &ADJUSTMENT...................................................................................... 33
6.8 COARSE ADJUSTMENT ...................................................................................................................... 34
6.9 TEMPERATURE ADJUSTMENT............................................................................................................. 37
6.10 FINE ADJUSTMENT .......................................................................................................................... 39
6.11 PARAMETER SETTINGS.................................................................................................................... 46
6.12 HALF-INITIALIZATION........................................................................................................................ 47
6.13 M ETHOD OF IDENTIFYING DEFECT LOCATION (E LECTRICAL PART OR M ECHANICAL PART ) ............................................... 48
Appendix: GX-A/GF-A Technical Information

GX-A/GF-A Maintenance manual
Page 2
1. Introduction
For smooth maintenance, the products must be technically understood, and the required
equipment and tools must be prepared. Since the GX-A/GF-A series electronic balance is a
precision instrument, proper operation cannot be guaranteed if the maintenance is performed
under unsatisfactory conditions.
1.1 Equipment and Tools Required
Description Purpose
(1) A Phillips screwdriver 3 mm For disassembling and reassembling
(2) ATorx wrench (T20H) For disassembling and reassembling
(T25H) For corner load adjustment
(3) An adhesive tape 8 mm For cleaning the force motor unit
(4) An Allen wrench 4 mm For securing the magnet support
(5) Round-nose chain pliers For disassembling guide of the lever
A nipper
(6) A square For the tension flexure adjustment
(7) A soldering iron (25-40 W) For soldering wires on force motor
(8) Masses
Model
Cylinder type Masses
Slotted type Masses
123 (Only GF-A)
100gx1
50gx2
203
100gx1, 200gx1
100gx2
303
200gx1, 300gx1
100gx3, 200gx1
403
200gx1, 400gx1
100gx4, 200gx2
603
300gx1, 600gx1
200gx3, 300gx2
1003
500gx1,1000gx1
200gx5, 400gx1, 600gx1
1603
500gx1, 600gx1
400gx4, 600gx2
Model
Cylinder type Masses
Slotted type Masses
1202 (Only GF-A)
500gx2,1kg x1
500gx2
2002
1kg x1, 2kg x1
1kg x2
3002
2kg x1, 3kg x1
1kg x3, 2kg x1
4002
2kg x1, 4kg x1
1kg x4, 2kg x1
6002/6001
3kg x1, 6kg x1
2kg x3
10002/10001
4kg x1, 10kg x1
2kg x5, 3kg x2, 4kg x1
(9) Multi-meter (Voltage measurement with 1mV resolution, Resistance measurement for
insulation resistance of 20MΩor more.)
(10) Oscilloscope
(11) AC adapter (Use theAC adapter supplied with the balance)
(12) The balance instruction manual

GX-A/GF-A Maintenance manual
Page 3
One set of jig for disassembling or reassembling the
Mechanical unit (7PA:GXA-JIG)
(1) A base jig (GXA-1/8)
(2) A spacer for positioning the beam (1) (GXA-2/8)
(3) A bolt for holding the beam (1) (GXA-3/8)
(4) A bord for positioning the beam (1)(GXA-4/8)
(5) A plate for positioning the beam (1)(GXA-5/8)
(6) A jig for positioning the fulcrum flexure (GXA-6/8)
(7) A jig for positioning the force coil bobbin GXA-7/8)
(8) A jig for assembling the beam (2) (GXA-8/8)
(9) Screws
Temperature Controlled Room
A room where the temperature can be maintained at 10 ±2°C and 30 ±2°C for 4 hours or
more.

GX-A/GF-A Maintenance manual
Page 4
2. Principles of operation
The GX-A/GF-A balances work on the principle of "Force Restoration". Any change in the load
on the weighing pan causes a Position Beam Lever to pivot on two Fulcrum Flexures (refer to
diagram below). Attached to this beam is a bobbin (wound with fine wire), called the "Force Coil",
which floats in a permanent magnet, called the "Force Motor". At the end of the Position Beam
Lever there is a small hole which allows light from a Light-Emitting Diode (LED) to pass through
to two Photodiodes (light measuring diodes) as it moves up or down. At zero weight, the light
detected by the upper Photodiode is equal to that detected by the lower Photodiode. These
three diodes make up the Position Detector.
When the Force Coil is pulled up by the leverage exerted from a mass on the weighing pan, the
Position Detector detects a change in the position of the Force Coil as the light reaching the
upper Photodiode will be greater than that reaching the lower one. The balance then feeds the
force coil with more voltage to pull it back until the light measured by the two Photodiodes is
equal again. This is accomplished by the Analog section receiving photocurrent from the
Photodiodes, converting it to voltage, and boosting it back to the Force Coil. As the voltage
increases, so does the magnetic power, pulling the Force Coil back until the Position Detector
reads equilibrium.
The current flowing through the Force Coil generates a voltage proportional to the load weight
on the pan. This is read back through the Analog section, first being filtered - then the
Analog-Digital (A/D) Converter digitalizes this measuring voltage; the resulting value is counted
and then fed to the microprocessor (CPU).
Temperature affects the magnet and weight data. So temperature coefficient for weight is
measured and saved beforehand. The balance eliminates the temperature effect by using the
present temperature measured by the temperature sensor and the coefficient. The output from
the temperature sensor is converted digitally and sent to the CPU by the analog module.
The CPU performs mathematical operations in connection with each parameter, such as
temperature, linearity coefficient, and calibration data. Also, the user can specify how the
calculated information should be displayed by using the keyboard. For example: s/he can have
the CPU perform special functions such as conversion into other measuring units, or counting of
small parts. Finally, the results are displayed on the Fluorescent Display, or sent through the
RS-232C interface.

GX-A/GF-A Maintenance manual
Page 5
2.1 Corrective Maintenance Outline
Performance test To perform the corrective maintenance, defects must
be located and their cause determined.
The easiest way to locate a defect is to perform an
operation check.
Corrective maintenance procedure Corrective maintenance is described by using a
flowchart and a troubleshooting table.
Adjustment details An adjustment procedure is described for each item.

GX-A/GF-A Maintenance manual
Page 6
3. Performance Test
The following test procedures determine whether the balance (GX-A/GF-A series) works
properly.
The internal temperature of the balance must be approached to the room (the air)
temperature enough, allow half an hour warm-up prior to conducting the performance test.
3.1 Performance Test Procedure
Verify the following points:
External view
1.Adjust the leveling feet to level the balance. Confirm it using the bubble spirit level.
2.The weighing pan should be level. (Check for the correct pan assembly.)
3.Use the breeze break for 0.001g model in GX-A/GF-A series.
Functions
1.Verify that each key functions correctly:
ON/OFF key
CAL key
MODE key
SAMPLE key
PRINT key
RE-ZERO key
2.Verify the following items and operations:
The minus indicator
The decimal point indicator
A stable weighing data can be obtained
The RS-232C communication function
Selection of the weighing units
Identifies each of three TLs.
e.g. when "264.555 TL" is displayed,
k =g display / TL display = 10000.0 / 264.555 = 37.799
3.Verify that the TAEL values are within tolerance:
Weight
Tolerance
Hong Kong (jewelry)
TN
1 TAEL = 37.4290 g
37.428-37.430 g
Hong Kong (general)
Singapore
TG
1 TAEL = 37.7994 g
37.798-37.800 g
Taiwan
TT
1 TAEL = 37.5000 g
37.499-37.501 g

GX-A/GF-A Maintenance manual
Page 7
3.2 Test Details
External mass calibration (GF-A series)
After external mass calibration by pressing CAL key, place the specified mass on the pan and
read the displayed value. Verify that the difference between the maximum value and the
minimum value is within the specifications.
GF-A series
Model
Masses
Specifications
123
100g
±0.001g
203
200g
303
300g
403
400g
603
600g
1003
1000g
1603
1600g
±0.002g
1202
1kg
±0.02g
2002
2kg
±0.01 g
3002
3kg
4002
4kg
6002
6kg
10002
10kg
±0.02g
6001
6kg
±0.1 g
10001
10kg
Internal mass repeatability (GX-A series)
Calibrate using the internal mass.
Perform this three times, verify that the all data be within the specifications.
GX-A series
Model
Masses
Specifications
203
200g
±0.010 g
303
300g
403
400g
603
600g
1003
1000g
1603
2002
2kg
±0.10g
3002
3kg
±0.15g
4002
4kg
6002
5kg
10002
6001
5kg
±0.5g
10001

GX-A/GF-A Maintenance manual
Page 8
Corner load error
Place the specified mass at the center of the pan (1) and record the displayed value. Then
place the mass, at positions 2, 3, 4, 5 then 6. Verify that the difference between the values at
the center and at each position (the cross marks 2, 3, 4, and 5 are half the distance from the
center of the pan to the corner edge) is within the specifications.
GX-A/GF-A series
Model
Masses
Specifications
123 (Only GF-A)
100g
±0.006g
203
303
200g
±0.008g
403
±0.007g
603
300g
±0.007g
1003
500g
±0.007g
1603
±0.008g
1202 (Only GF-A)
1kg
±0.06g
2002
3002
2kg
±0.08g
4002
±0.07g
6002
3kg
±0.07g
10002
4kg
±0.10g
6001
3kg
±0.3g
10001
4kg
Weighing pan
2
5

GX-A/GF-A Maintenance manual
Page 9
Repeatability
Place the specified mass at the center of the pan and remove. Record the displayed values
with and without load. Repeat the test ten times (one set). Get 10 span data by subtracting
the displayed value when no load is applied from the displayed value when load is applied.
Obtain the standard deviation from the 10 data and verify that it is within the specifications. If
not, perform another two sets of test and obtain the standard deviation for each set. Verify
that the two standard deviations are within the specifications.
Model
(GX-A /GF-A series)
Offset
load(tare)
Masses
Specifications
123 (Only GF-A)
100g
0.001g(standard deviation)
203
200g
303
300g
403
400g
603
600g
1003
1000g
1603
600g
1000g
1202 (Only GF-A)
1kg
0.01g(standard deviation)
2002
2kg
3002
3kg
4002
4kg
6002
6kg
10002
5kg
5kg
6001
6kg
0.1g(standard deviation)
10001
10kg

GX-A/GF-A Maintenance manual
Page 10
Linearity / Hysteresis
（１）GX-A/GF-A series
Linearity/ Hysteresis
After calibration by using an external weight close to the weighing capacity, place the specified
mass one by one on the pan, and check the difference between true value and display value
(linearity). After reaching weighing capacity, remove the mass one by one, and check the
difference between an increase and decrease (hysteresis).
GX-A/GF-A series
Model
Masses
Linearity
Hysteresis
123 (Only GF-A)
50g×2
±0.002g
±0.002g
203
100g×2
303
100g×3
403
100g×4
603
200g×3
1003
200g×5
±0.003g
±0.003g
1603
400g×4
±0.004g
1202 (Only GF-A)
500g×2
±0.02g
±0.02g
2002
1kg×2
3002
1kg×3
4002
1kg×4
6002
2kg×3
±0.03g
±0.04g
10002
2kg×5
±0.06g
6001
2kg×3
±0.1g
±0.1g
10001
2kg×5

GX-A/GF-A Maintenance manual
Page 11
4. Corrective Maintenance
Perform corrective maintenance for the GX-A/GF-A series by referring to the maintenance
flowchart and the troubleshooting table. The troubleshooting table describes the possible
cause and solution to facilitate corrective maintenance.
Perform corrective maintenance according to the error (the letters refer to nodes on the
maintenance flow chart):
Type A: Replacing, disassembling, or assembling the force motor unit
Type B: Replacing or adjusting electrical parts
Type C: Initializing the electric board and inputting specific data
Type D: Adjusting the characteristics of the force motor unit
Type E: Inputting temperature data
Type F: Performance test
Type G: Performing drift check
Type H: Replacing the main board
4.1 Troubleshooting Table
The following troubleshooting table describes the possible cause of, and the solution to
problems.
Problem
Cause
Check
Solution
Type
No
display,
beam is
not
balanced
AC adapter
Is it the correct AC adapter for the
power source used?
Replace with the correct AC
adapter.
F
Is the output voltage correct? Measure
the output voltage of the AC adapter
when it is connected to the balance.
The DC output should be at least 11
volts, but no greater than 22 volts.
If the output voltage is not correct,
replace the AC adapter.
F
Power supplies of
main board
and
display
board
Is the output of each power supply
correct? (Refer to Table-1 of page 15)
Check the Vdd, Vgc, Vcc, VLDC.
Check (replace) the main board or
display board with substitute
items.
H
Check (replace) the defective
power supply part with a substitute
item.
F
Force motor
Check that the connectors are installed
correctly(J10A).
Replace the force motor with a
substitute item.
(Refer to “5. Force Motor
Disassembly and Reassembly”)
A
Main board
assembly
Check the performance using the
standard main board that works
properly.
Replace the main board assembly
with a substitute item.
H
Analog board
assembly
Check the performance using the
standard analog board that works
properly.
Replace the analog board
assembly with a substitute item.
E

GX-A/GF-A Maintenance manual
Page 12
Problem
Cause
Check
Solution
Type
Unstable
weighing
data,
repeatability
error
Force motor,
Analog board
assembly
Check the operation of weight /
temperature offset A/D.
(Refer to “6-13 Method of
identifying defect location”)
Replace the analog board
assembly
E
Then if it is OK, the cause will be
the force motor.
Check the force motor
A
Pan assembly
Check that the pan assembly is
correctly installed
Install the pan assembly
correctly.
F
Check for foreign matter between
the pan and dust plate.
Clean the area around the pan
assembly and the dust plate.
F
Check that the dust plate does not
touch the pan assembly.
Install the dust plate correctly so
that it does not touch the pan.
F
Damage in
flexures
Check the condition of tension and
fulcrum flexures and lever.
Replace the parts and
reassemble the force motor.
A
Magnet
assembly
Check for dust particles between
the magnet and the force coil.
Clean the force motor assembly.
(Refer to “5. Force Motor
Disassembly and Reassembly”)
A
Force motor
assembly
Check that the flexures are in good
conditions and are correctly
installed.
Repair the force motor assembly.
(Refer to “5. Force Motor
Disassembly and Reassembly”)
A
Corner load
error
Force motor
assembly
Check that the flexures are in good
conditions and are correctly
installed.
Perform corner load adjustment.
F
If it does not work well,
disassemble and reassemble the
balance.
(Refer to “5. Force Motor
Disassembly and Reassembly”)
A
Hysteresis
error
Tension or
Fulcrum flexures
Check the condition of tension and
fulcrum flexures for distortion.
Replace with substitute items.
Disassemble and reassemble the
balance.
(Refer to “5. Force Motor
Disassembly and Reassembly”)
A
Linearity
error
Force motor
assembly
Follow the linearity check
procedure.
Input the linearity data.
Refer to page 40.
F
If it does not work well,
disassemble and reassemble the
balance.
(Refer to “5. Force Motor
Disassembly and Reassembly”)
A
After
calibrated
using the
internal
mass, the
weighing
data is not
correct
(OnlyGX-A)
Force motor
assembly
After auto calibration using the
internal mass, check the value
using the specified mass.
Fine adjustment of the linearity.
Refer to page 40~45.
F

GX-A/GF-A Maintenance manual
Page 13
Problem
Cause
Check
Solution
Type
Eerror 0
Temperature
data error
Temperature
sensor,
Analog
board
assembly,
Cables,
connectors
Check the operation of weight /
temperature offset A/D.
(Refer to “6-13, 1 Method of
identifying defects in the internal
offset mode”)
In the T1 display of check mode
menu, check the absolute value
and dispersion (Refer to 6-7). If it
is NG further, replace and
reassemble temperature sensor.
B
Then if it is NG, the cause will be
the analog board assembly.
Replace the analog board.
E
Eerror 1
Unstable
weighing
data
Force
motor,
Analog
board
assembly
Check the operation of weight /
temperature offset A/D.
(Refer to “6-13 Method of
identifying defect location”)
If it is OK, the cause is the force
motor.
Check the force motor.
A
Then if it is NG, the cause will be
the analog board assembly.
Replace the analog board
assembly.
E
Pan
assembly
Check that the pan assembly is
correctly installed.
Install the pan assembly
correctly.
F
Check for foreign matter between
the pan and dust plate.
Clean the area around the pan
assembly and the dust plate.
F
Check that the dust plate does
not touch the pan assembly.
Install the dust plate correctly so
that it does not touch the pan.
F
Damaged
flexures
Check the condition of tension
and fulcrum flexures and lever.
Replace the parts and
reassemble the force motor unit.
A
Magnet
assembly
Check for dust particles between
the magnet and the force coil.
Clean the force motor assembly.
(Refer to “5. Force Motor
Disassembly and Reassembly”)
A
Weighing
error
relating to
calibration
Check if Eerror 1 appears due
to underloading (-e) during
automatic zero adjustment after
the balance is turned on.
Calibrate.
F
Eerror 3
Defective
EEPROM
Defective
EEPROM
on the Main
board
Bad connection between CPU
(U1) and EEPROM (U3,U4)
Check the soldering around each
IC.
Re-solder
F
Replace the CPU (U1)
F
Replace the EEPROM (U3,U4)
H
Note
After replacing the CPU or
EEPROM, Error 8, Error 9
may be displayed. To correct the
error, see the solution for each
error described in this table.
－

GX-A/GF-A Maintenance manual
Page 14
Problem
Cause
Check
Solution
Type
Eerror 8
EEPROM
error
CPU (U1)
and
EEPROM
(U9) on the
main board
The EEPROM version is not
correct for the newer CPU
version.
Press the PRINT key to change
the EEPROM version.
F
Eerror 9
EEPROM
format error
CPU (U1)
and
EEPROM
(U9) on the
main board
EEPROM has not been initialized.
While holding down the
RE-ZERO and MODE keys,
press the PRINT key to initialize
the EEPROM.
C
Cal e
-Cal e
Calibration
range error
The mass
exceeds
the
calibration
range
Check that the correct mass is
used for calibration.
Use the correct mass.
F
Analog
board
assembly,
coil, zero or
span
Check the D0 value.
If the D0 value is not within the
specifications, replace parts and
reassemble. (When the D0 value
is correct, perform calibration in
check mode)
A
Defective
pump(Only
GX-A)
Check the pump.
Replace the pump or pump
control board.
F
Defective
solenoid
valve(Only
GX-A)
Check the solenoid valve.
Replace the solenoid valve or
pump control board.
F
Ee
Overload
Weighing
error
relating to
calibration
Check the D0 value
When the D0 value is correct,
perform calibration in check
mode, then perform calibration
in the weighing mode
F
Damage in
flexures
Check the D0 value
If the D0 value is not within the
specifications, replace flexures
and reassemble
A
-e
Underload
Weighing
pan
Check if the correct pan is used
and that the pan is installed
correctly
Use the correct pan and install it
correctly
F
Weighing
error
relating to
calibration
Check the D0 value
When the D0 value is correct,
perform calibration in check
mode, then perform calibration
in the weighing mode
F
Damage in
flexures
Check the D0 value
If the D0 value is not within the
specifications, replace flexures
and reassemble
A

GX-A/GF-A Maintenance manual
Page 15
Table-1 Specifications of each power-supply voltage on the main board and display board
Circuit symbol
Specifications
Check point (Check pad)
Voltage generation
element
Vdd
3.1V –3.5V
Vdd - LG
U6
Vgc
4.7V –5.3V
Vgc - LG
U7, U8
Vcc
9.5V –10.5V
Vcc - LG
U8
VLCD*
3.0V –3.5V
VLCD -GS
U101
* PZ6596
Table-2 Specifications of each power-supply voltage on the pump control board (Only FZ)
Circuit symbol
Specifications
Check point (Check pad)
Voltage generation
element
Vpu (GX-A)
2.1V –2.3V
VPU -SG
U901

GX-A/GF-A Maintenance manual
Page 16
4.2 Maintenance Flowchart
Yes
No
Confirming the operation of
internal mass(GX-A)
Analog board ?
(7PZ46595)
Disassemble the
force motor
Clean the
force motor
Reassemble the
force motor
Coarse adjustment
of the force motor
or EEPROM ?
Main board
Replace
(7PZ6594)

GX-A/GF-A Maintenance manual
Page 17
5. Force Motor Disassembly and Reassembly
This chapter describes the procedures and notes for the flexure assembly replacement,
bobbin cleaning, and adjustment after reassembling the force motor.
Notes: The disassembly and reassembly should take place in a dust free environment.
Adjustments and confirmations are needed after reassembly for linearity,
repeatability, creep, hysteresis and corner load error.
Temperature adjustment is also needed since the balance is affected by
tightening torque or stress. If you do not have the proper facilities to do the
temperature adjustment, do not attempt to adjust the temperature feature.
Jig set (7PA:GXA-JIG) for GX-A/GF-A mechanical unit disassembly
and reassembly
●Other tools required:
A square Allen head screw ：M5x10 (3pcs)
M2, M4 screwdriver M4x15 (1pc)
M4, M5 torx wrench
M4, M5 allen wrench Pan head screw ：M3x 80 (1pc)
5.5mm spanner M4 x 8 (6pcs)
A soldering iron M4 x 10 (2pcs)
A base jig
GXA-1/8
A spacer for positioning
the beam(1)
GXA-2/8
A bolt for holding
the beam(1)
GXA-3/8
A board for positioning
the beam(1)
GXA-4/8
A plate for positioning
the beam(1)
GXA-5/8
A jig for positioning the
fulcrum flexure(1)
GXA-6/8
A jig for positioning the
force coil bobbin
GXA-7/8
A jig for assembling
the beam(2)
GXA-8/8

GX-A/GF-A Maintenance manual
Page 18
5.1 Disassembly
1. Removing the lower case
①Remove the weighing pan.
②Remove the pan support.
③Remove the lower case (Pan head screw M4x8, WS 4pcs)
2. Removing the mechanical unit
①Remove the Inner case.
②Disconnect the cable from the A/D
board.
③Remove the mass receiver. (Pan head
screw M4x6 with coned disk spring
, 2pcs) GX-A series only.
④Remove the mechanical unit. (Allen
head screw M5x10 with coned disk
spring , 2pcs)
3. Disassembling the mechanical unit
①Remove the shock absorber. (Short head
torx screw M5x8 , 3pcs)
②Remove the Counter weight. (Pan head
screw M3x40,1pc and Nut with spring
washer M3, 1 pc)
③Remove the under hook.
④Remove the position sensor. (Pan head
screw M3x6 WS ,2pcs)
⑤Remove the magnet unit1(Shield plate)
(Shield plate mounting screw, 2pcs).
※Use the pan head screw M3x80 as jig.
⑥Remove the magnet unit2(Yoke).(Pan head
screw M4x8 WS, 2pcs)
mass receiver
mechanical unit
shock absorber
Counter weight
position sensor
under hook