Intercomp CS750 User manual

Page 1 of 27
CS750 Crane Scale
Users Manual
Intercomp Co.
3839 County Road 116
Medina MN 55340
(763)-476-2531
1-800-328-3336
Fax: [phone]
www.intercompcompany.com
Manual#: 700002-S

CS750, sers
Rev S, June 2010
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Table of Contents
INTRODUCTION .......................................................................................................................................................3
SPECIFICATIONS .........................................................................................................................................................3
Controls................................................................................................................................................................3
Electrical..............................................................................................................................................................3
Performance.........................................................................................................................................................3
Environmental......................................................................................................................................................3
Physical................................................................................................................................................................3
WEIGHTS AND MEASURES .........................................................................................................................................4
OPTIONAL EUIPMENT...............................................................................................................................................4
OPERATIONS.............................................................................................................................................................5
OPERATING PRACTICES..............................................................................................................................................5
DISPLAY ....................................................................................................................................................................6
CONTROLS .................................................................................................................................................................6
ON........................................................................................................................................................................7
OFF......................................................................................................................................................................7
ZERO....................................................................................................................................................................7
BACK L GHT.......................................................................................................................................................7
Hidden key ...........................................................................................................................................................7
REMOTE CONTROL ....................................................................................................................................................8
OPERATION................................................................................................................................................................9
Use .......................................................................................................................................................................9
Periodic Maintenance ..........................................................................................................................................9
POWER/BATTERIES ....................................................................................................................................................9
Replacement.........................................................................................................................................................9
Rechargeable (Ni-cad).........................................................................................................................................9
MAINTENANCE.......................................................................................................................................................10
PERIODIC INSPECTION..............................................................................................................................................10
Service Categories .............................................................................................................................................10
nspection Requirements ....................................................................................................................................10
Removal from Service Criteria...........................................................................................................................11
CALIBRATION...........................................................................................................................................................12
How to test the calibration.................................................................................................................................12
Calibration switch..............................................................................................................................................13
Enabling the Calibration switch ........................................................................................................................13
How to calibrate the scale..................................................................................................................................13
Weight calibration..............................................................................................................................................18
LEGAL-FOR-TRADE SEALING ...................................................................................................................................18
TROUBLESHOOTING ............................................................................................................................................19
ERROR MESSAGES ................................................................................................................................................21
PARTS AND ACCESSORIES..................................................................................................................................22
PARTS LIST ..............................................................................................................................................................23
SERIAL OUTPUT (OPTIONAL) ............................................................................................................................24
HOW TO REACH INTERCOMP SERVICE.........................................................................................................27

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Introduction
This manual contains specifications, operation instructions, and calibration instructions
for Intercomp's model CS750 crane scale.
Specifications
Controls
General: Zero, On, Off, Backlight
Display: 5 digit LCD.
Indicators: lb, kg.
Electrical
Batteries: 6 X D-size disposable alkaline dry cells or rechargeable Nickel-
Cadmium cells.
Battery life: p to 250 hours with alkaline batteries. Approximately 80 hours
on a set of fully charged Ni-Cad cells.
Resolution: 20 bit A/D delivers over 1,000,000 internal counts.
Filtering: 6 Pole, 10 Hertz low pass.
Auto off: Low battery, or after adjustable time without use or motion.
Sleep
mode:
Display sleep mode after adjustable time without use or motion.
Auto-Zero: Satisfies all HB-44 requirements; selectable 0.6, 1, or 3
graduations.
Performance
Accuracy: ±0.1% of applied load or ± display graduation, whichever is greater.
Environmental
Humidity: 10 to 95% Non-Condensing
Temperature: Storage: -40 C to +75 C. / -40 F to +170 F.
Operating -10 C to +50 C. / +14 F to +122 F.
Physical
Dimensions:
Control Box: 4.25" x 5" x 8.5". / 10.8 cm X
12.7 cm x 21.6 cm.
Lifting eye to hook (Standard): 12" / 30.5 cm.
Weight: 7.5 lb. / 3.4 kg.

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Weights and Measures
The CS750 meets or exceeds class III standards for 3000
division accuracy from 300 lb to 1000 lb. The certification was
completed by the National Type Evaluation Program (NTEP)s in
accordance with the National Institute of Standards and Technology
(NIST) Handbook 44. A NTEP Certificate of Conformance Number
97-135A4 was issued under the National Conference of Weights and
Measures.
Also approved by Measurement Canada for 3000 division accuracy, accuracy class III,
from 300 lb to 2000 lb. Approval no. AM-5228.
Optional Equipment
RS232 Serial data output (100721)
This option adds an RS232 connection so the unit may transmit a continuous output to
communicate with a computer or remote display.
LED Display (100725)
Optional LED (light emitting diode) display instead of the standard LCD (liquid crystal
display) display. An LED is fully readable in pitch-dark lighting situations.
Battery pack and 120V external charger (100730)
Rechargeable Ni-Cad battery pack (6 D-cells) with 120V external charger. Standard
power uses 6 disposable alkaline dry cells.
Battery pack and 220V external charger (100731)
Rechargeable Ni-Cad battery pack (6 D-cells) with 220V external charger. Standard
power uses 6 disposable alkaline dry cells.
Direct Power on crane unit 120V (100723)
This option allows the CS750 to use 120V power instead of batteries.
Direct Power on crane unit 220V (100727)
This option allows the CS750 to use 220V power instead of batteries.
Set Points dual channel (100792)
This option allows for 2 external set points. When the specified weight (set point) is
reached, a logic level high will be on the set point connection. Set points are used with
some other device (e.g. alarm, relay) in conjunction to the CS750.

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Operations
Operating Practices
Warning: The crane scale will be operated by qualified designated persons, trainees
under the direct supervision of designated persons, maintenance and test personnel
when in performance of their assigned duties, or lifting device inspectors.
Warning: Do not exceed the rated load limit of the crane scale.
Warning: The crane scale shall be applied to the load in accordance with the
instruction manual.
Warning: Prior to lifting the operator shall make sure that all ropes or chains are not
kinked and if multiple lines are used they are not twisted around each other.
Warning: Ensure that the load is correctly distributed for crane scale use.
Warning: Ensure the temperature of the load does not exceed the maximum
temperature limits of the crane scale.
Warning: Ensure that swinging of the crane scale is minimized when positioning it over
the load.
Warning: Avoid any sudden acceleration of deceleration when moving the load.
Warning: Do not allow the crane scale or the lifter to come into contact with any
obstruction when moving the load.
Warning: Do not operate the crane scale if it has damaged, malfunctioning or missing
parts.
Warning: Do not lift people with the crane scale.
Warning: Do not lift suspended loads over people.
Warning: Do not use the crane scale to pull side loads or to slide loads unless
specifically authorized by a qualified person.
Warning: Do not leave suspended loads unattended.
Warning: Do not remove or obscure warning labels.
Warning: Do not operate the crane scale without having read and understood the
operating manual.

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Warning: Stay clear of suspended loads.
Warning: Do not lift loads higher than necessary.
Warning: Do not make alterations or modifications to the crane scale.
Warning: Ensure all portions of the human body are kept clear of all device involved
with the rigging during the lift.
Display
Controls
Hidden key

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ON
Press this button to turn the scale on. The scale tests itself; when these tests
have completed successfully, the system begins weighing.
Note: If you used the remote control to turn off the scale (the last time), you must
first press the OFF key, then press the ON key.
OFF
Press this button to turn the scale off.
ZERO
Tells the scale to display a zero weight. This button is used any time the scale
shows a non-zero value with no weight on the hook. If you press ZERO with
weight on the hook, that weight becomes the zero condition for the scale. This
can be useful to cancel the weight of any weighing fixtures, such as containers,
chains or cables. When this weight is removed, a negative weight shows until
the system is zeroed again. NOTE: The “zero” command will be delayed any
time a change in weight is detected. If there is continuous motion for more than
20 or 30 seconds, the zero command will be rejected and the scale will return to
normal weighing.
NOTE: The scale contains a feature called Auto Zero Tracking (AZT), which
corrects for slight zero changes during normal operation. If small weights are
added slowly, the scale could zero them off.
BACK LIGHT
Turns the back light on or off for the LED display.
Hidden key
The switch referred to as the hidden key is unlabeled and located directly to the
left of the ZERO key. This switch has no function except during calibration.

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Remote Control
The circled keys on the diagram below are active for the CS750 crane scale.
Remote Control Keypad Layout
sed when
entering a number
sed when
entering a number
Numeric keypad:
sed when entering
a number
Calibrate: Press to
advance through
calibration menu
Notes: Need to
press twice to turn
on.
The ON key on
the scale must be
pressed to initially
turn on the
CS750.

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Operation
Use
Periodic Maintenance
Power/Batteries
Replacement
On the right side panel, remove the two screws that hold the back plate secure.
Slide this plate out to access the batteries inside. Change the cells, being
careful to note battery orientation.
You may use 6 rechargeable Nickel-Cadmium “D” cells or 6 standard “D” cells in
the CS750.
Warning: Do not plug the charger in while there are standard “D”
cells inside. This could result in damage to the batteries and your
scale.
Rechargeable (Ni-cad)
The typical recharge time for Ni-Cad cells is 16 hours. The rechargeable
batteries have a life span up to 1000 cycles.

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Maintenance
Periodic Inspection
The crane scale and all associated adaptive devices require periodic inspection and
maintenance. The frequency and recording of the inspection requirements are found in
service categories below and are dependant on the type of service that the equipment
is used in as described below.
Service Categories
Normal Service – Crane scale is operated at less than 85% of it’s capacity except for
isolated instances. Complete the frequent service inspection monthly and record the
periodic service inspection annually.
Heavy Service – Crane scale is operated at 85% - 100% of it’s capacity as part of
normal usage. Complete the frequent service inspection weekly to monthly and record
the periodic service inspection semi-annually.
Severe Service – Crane scale is operated at 85% - 100% of it’s capacity and used in
environmental conditions that are unfavorable, harmful or detrimental to the use of the
crane scale. Complete the frequent service inspection daily to weekly and record the
periodic service inspection quarterly.
Inspection Requirements
Frequent Service Inspection (records not required)
A frequent visual inspection is completed at intervals indicated by the service category
above by the operator or designated person of the following.
1. Inspect for structural deformation, cracks or excessive wear of any part of the
crane scale or associated adaptive devices.
2. Inspect for loose or missing guards, fasteners, covers, stops, or nameplates.
3. Inspect all functional operating mechanisms and automatic hold and release
mechanisms for improper adjustments interfering with operation of the crane
scale or associated adaptive devices.
4. Inspect for distortion such as bending, twisting, or increased throat opening (if
applicable)
Periodic Service Inspection (records required)
A periodic visual inspection is completed at intervals indicated by the service category
above by the operator or designated person and documented to provide the basis for
continuing evaluation. The periodic inspection will cover areas in the frequent service
inspection above and the following.
1. Inspect for loose bolts or fasteners.
2. Inspect for cracked or worn gears, pulleys, sheaves, sprockets, bearings, chains,
and belts.

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3. Inspect for excessive wear of linkages and other mechanical parts.
4. Inspect for excessive wear at hoist hooking points and load support clevices or
pins.
5. Inspect for any visible bends or twists of all used rigging devices.
6. Inspect all latches and locks for proper operation (if applicable)
Removal from Service Criteria
Note: Replacement parts of any device or parts of any device used in any aspect of
rigging to lift a load shall be at least equal to the original manufacture’s specifications
Hooks
Hooks shall be removed from service if damage such as the following is found and shall
only be returned to service if a qualified person approves their continued use and
initiates corrective action.
1. Hooks show cracks, nicks, or gouges.
2. Hook has wear exceeding 10% of the original sectional dimension.
3. Hook has any visible bend or twist from the plane of the unbent hook.
4. Hook has an increase in throat opening of 5% not to exceed ¼ of an inch.
5. If self-locking hooks have the inability to lock.
6. A hook latch that is inoperable (if applicable)
Shackles
Shackles shall be removed from service if damage such as the following is visible and
shall only be returned to service when approved by a qualified person.
1. If the manufacturers name or trademark and / or the rated load identification is
missing or illegible.
2. The device shows signs of heat damage including weld spatter or arc strikes.
3. The device shows excessive pitting or corrosion.
4. The device is bent, twisted, distorted, stretched, elongated, cracked, or has
broken load-bearing components.
5. The device has excessive nicks or gouges.
6. The device has a 10% reduction of the original or catalog dimension at any point
around the body or pin.
7. The device has incomplete pin engagement.
8. The device has excessive thread damage.
9. The device shows evidence of unauthorized welding.
10. Any other condition including visible damage that causes doubt to the continued
use of the shackle.

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Calibration
How to test the calibration
This calibration procedure should be performed annually for normal operating
conditions. If the scale is dropped or damaged, or service has been performed on the
scale, use this calibration check. Recommend calibration points at 10% intervals from
10% through 100% of the scales capacity.
1. Press the ON switch. The display does a lamp test; during this time the scale does
a quick check of itself. Then the weighing system starts weigh mode.
2. Intercomp recommends that you allow the electronics to operate for three minutes
after first turning power on. This allows the electronics to become stable for
maximum accuracy before you check the calibrations.
3. Make sure no weight is on the hook. Press the ZERO switch. The weight shown is
zero.
4. Apply weights throughout the weighing range, and verify the correct weight is
displayed at each step. (+/- 0.1% of applied load or ±1 display graduation, whichever
is greater)
5. If possible apply a weight of 105% of capacity, and verify the scale shows “OE
OEOE
OE” on
the display.
6. Remove weights and verify the display returns to zero.
7. If there is a failure to meet any of the conditions above, please refer to the
Calibration Procedure.
8. When all the conditions above are correct, the scale is operational.
How to enter a number
During this routine you will be asked to enter numbers at many points. The scale will
show a number (originally all zeros) with a blinking digit. Press the ZERO key to
increase the blinking digit. Press the hidden key to move to other digits. When you are
finished entering the number press the ZERO and hidden keys together.
Three point span
The scale has a three point calibration feature which reduces the effects on non-
linearity in the load cells. This requires that you place three weights on the cell during
calibration. The first weight must be greater than zero, the second greater than the
first, and the final weight somewhere between the second and the capacity.

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Calibration switch
The calibration of the scale is protected from accidental change by a switch just inside
the right side panel.
Enabling the Calibration switch
sing a screwdriver, remove the right side plate and move the switch to “CAL”.
When you are done calibrating, return the switch to “R N” to protect against
change.
How to calibrate the scale
The following details the calibration procedure for the crane scale. There are eight
parameters that can be set without moving the calibration blocking switch, followed by
five more parameters and calibration that require the calibration blocking switch be in
the enabled position.
Display Parameter Note Default
ee-ee
ee-eeee-ee
ee-ee Skip 0=no skip, 1=”EE-10
EE-10EE-10
EE-10”, 2=”LL-00
LL-00LL-00
LL-00” 0
EE-00
EE-00EE-00
EE-00 Sample Rate 1 to 64 4
EE-01
EE-01EE-01
EE-01 pdate Rate 1 to 32 4
EE-02
EE-02EE-02
EE-02 Demand Output 1=Continuous off
0=Continuous on
0
EE-03
EE-03EE-03
EE-03 Baud Rate 0 to 9 0
EE-04
EE-04EE-04
EE-04 Auto-off Time 0 to 255; 0=off 20
EE-05
EE-05EE-05
EE-05 Power up in KG 1=kg, 0=lb 0
EE-06
EE-06EE-06
EE-06 Not sed Not sed 0
EE-07
EE-07EE-07
EE-07 Sleep Mode Time 0 to 255; 0=off 5
ee-08
ee-08ee-08
ee-08 Set Point 1 1 to 99999 99999
ee-09
ee-09ee-09
ee-09 Set Point 2 1 to 99999 99999
Information saved
Check for calibration
blocking switch
EE-10
EE-10EE-10
EE-10 AZT 0=off,1=0.6,2=1,3=3 2
EE-11
EE-11EE-11
EE-11 Zero Range 0=off,1=on 0
EE-12
EE-12EE-12
EE-12 Canadian Specifications 0=off, 1=on 0
EE-13
EE-13EE-13
EE-13 Initial Zero Range 0=off, 1=on 0
EE-14
EE-14EE-14
EE-14 Graduation 0 to 11 6
Information saved
LL-00
LL-00LL-00
LL-00 Zero read Enter capacity
LL-01
LL-01LL-01
LL-01 First weight Enter first weight
LL-02
LL-02LL-02
LL-02 Second weight Enter second weight
LL-03
LL-03LL-03
LL-03 Third weight Enter third weight
Information saved

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Start up
1. Move the calibration blocking switch to the “CAL” position if you intend to
calibrate.
2. Turn scale power ON and wait for scale to warm up (3 minutes from power
on).
3. Press ZERO and hidden keys together and release to enter the calibration
mode.
First ten parameters
4. The scale shows “EE-EE
EE-EEEE-EE
EE-EE”. Press the zero key. To skip to “EE-10
EE-10EE-10
EE-10” enter a “1
11
1”.
To skip to “LL-00
LL-00LL-00
LL-00” enter “2
22
2”. No skips will occur with an entry of “0
00
0”.
5. The scale shows “EE-00
EE-00EE-00
EE-00”. Press the zero key. Enter the sample rate (1 to
64). The sample rate is the number of past readings that are averaged
together to make a reading.
6. The scale shows “EE-01
EE-01EE-01
EE-01”. Press the zero key. Enter the update rate (1 to
32). The update rate is the speed at which the displayed weight is updated.
The smaller the number the faster the display will be updated.
7. The scale shows “EE-02
EE-02EE-02
EE-02”. Press the zero key. Enter demand versus
continuous on the optional serial output. For this product, you should always
set this to "Continuous" (0).
Setting Type
0 Continuous on
1 Continuous off
8. The scale shows “EE-03
EE-03EE-03
EE-03”. Press the zero key. Enter the baud rate of the
serial output (0 to 7).
Setting Baud Rate
0 9600
1 4800
2 2400
3 1200
4 600
5 300
6 150
7 75
8 19.2K
9 38.4K

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9. The scale shows “EE-04
EE-04EE-04
EE-04”. Press the zero key. Enter the auto off time in
minutes (0 to 255). The auto off time is how long the scale will remain ON
without any activity (a key being pressed or a change in weight). An entry of
0 turns the auto off feature OFF.
10. The scale shows “EE-05
EE-05EE-05
EE-05”. Press the zero key. Enter what unit of measure
the scale should turn ON in; pounds or kilograms (0 to 1).
Setting Units to turn ON in
0 pounds (lb)
1 kilograms (kg)
11. The scale shows”EE-06
EE-06EE-06
EE-06”. Press the zero key. This function not used by
CS750.
12. The scale shows “EE-07
EE-07EE-07
EE-07”. Press the zero key. Enter the sleep mode time in
minutes (0 to 255). The sleep mode time is how long the scale's display will
remain ON without any activity (a key being pressed or a change in weight).
An entry of 0 turns the sleep mode feature OFF. The sleep mode is designed
to conserve battery life on scales with a LED display.
13. The scale shows “EE-08
EE-08EE-08
EE-08”. Press the zero key. Enter set point 1.
SET POINT 1
This is an optional feature that allows for an external set point. When the
specified weight (set point) is reached, a logic level high will be on the set
point connection. Set points are used with some other device (e.g. alarm,
relay) in conjunction to the CS750.
To activate a set point press the Set Point 1 (or Set Point 2) key. Enter
the weight you want the set point to activate.
Note: If the scale is over capacity (“OE
OEOE
OE” will be displayed) the set points
will always become active.
SET POINT 2
Operates the same as Set Point 1.
14. The scale shows “EE-09
EE-09EE-09
EE-09”. Press the zero key. Enter set point 2.
Check for calibration blocking switch
•At this point the scale saves any changes that have been made.
•A check is than made to see whether or not the calibration blocking switch is
enabled. If enabled, (CAL), the calibration procedure will continue. If disabled,
(R N), the scale returns to normal weighing.

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Last five parameters.
15. The scale shows “EE-10
EE-10EE-10
EE-10”. Press the zero key. Enter the AZT size (0 to 3).
The AZT size is the number of graduations the auto zero tracking can
remove.
Setting AZT size
0 Off
1 0.6
2 1.0
3 3.0
16. The scale shows “EE-11
EE-11EE-11
EE-11”. Press the zero key. Enter whether the zero range
is on or off (0 to 1). If the zero range is ON the push-button zero and AZSM
can only operate within +/- 5% of the original zero obtained at calibration.
Setting Zero range
0 Off
1 On
17. The scale shows “EE-12
EE-12EE-12
EE-12”. Press the zero key. The scale shows the current
Canadian specification selection. se the following table to select the
Canadian specifications setting. When Canadian specifications are set (1):
“EE-10
EE-10EE-10
EE-10” “EE-11
EE-11EE-11
EE-11”, and “EE-13
EE-13EE-13
EE-13” have no meaning.
Setting Canadian
Specification
0 Off
1 On
A “0” setting implies normal operation:
1: AZT size is determined by the setting of “EE-10
EE-10EE-10
EE-10”.
2: Zero operates over full range allowed by “EE-11
EE-11EE-11
EE-11”.
3: The over-capacity point is determined by the setting of “EE-13
EE-13EE-13
EE-13”.
A “1” setting implies Canadian specifications are used.
1: The AZT size fixed at 0.6d regardless of “EE-10
EE-10EE-10
EE-10” setting.
2: The IZSM (initial zero setting mechanism on power up) must be
within +/- 10% of the zero obtained at calibration.
3: The push-button zero and AZSM can only operate within +/-
2% of the IZSM.
4: The over-capacity point is 103% of capacity above the IZSM.

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18. The scale shows “EE-13
EE-13EE-13
EE-13”. Press the zero key. The scale shows the current
initial zero range setting. se the following table to select the “initial zero
range” setting:
Setting Initial zero range
0 Off
1 On
A “0” setting implies: The initial zero setting mechanism (IZSM) will work
over the entire range of the scale capacity and the over-capacity point is 103%
above the zero obtained at calibration.
A “1” setting implies: The IZSM must be within +/- 10% of the zero
obtained at calibration and the over-capacity point is 103% above the IZSM.
19. The scale shows “EE-14
EE-14EE-14
EE-14”. Press the zero key. The scale shows the current
graduation selection. se the following table to select a graduation value.
Settings Count by in lb Count by in kg
0 100 50
1 50 20
2 20 10
3 10 5
4 5 2
5 2 1
6 1 0.5
7 0.5 0.2
8 0.2 0.1
9 0.1 0.05
10 0.05 0.02
11 0.02 0.01
12 0.01 0.01
NOTE: The stated accuracy specifications are based on the graduation setting in
the table below. If the graduation setting is set other than the value in the table
below the accuracy specification remains with the graduation size listed below.
If your capacity is: Set your graduation to:
25 lb / 12.5 kg .01 lb / .01 kg (12)
50 lb / 25 kg .02 lb / .01 kg (11)
100 lb / 50 kg .05 lb / .02 kg (10)
250 lb / 125 kg .1 lb / 0.05 kg (9)
300 lb / 150 kg .1 lb / 0.05 kg (9)
500 lb / 250 kg 0.2 lb / 0.1 kg (8)
1000 lb / 500 kg 0.5 lb / 0.2 kg (7)

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Save
•At this point the scale saves any changes that have been made. This allows
changes to be made to “EE-10
EE-10EE-10
EE-10” through “EE-14
EE-14EE-14
EE-14” without having to do a complete
calibration. The scale can be turned off and any changes so far will be saved.
Weight calibration
20. The scale shows “LL-00
LL-00LL-00
LL-00”. With no weight on hook press the zero key. This
reads the pad zero. On the next screen, enter the scale's capacity.
21. The scale shows “LL-01
LL-01LL-01
LL-01”. Apply the first weight. With the first weight stable
on the hook, press the zero key. Then enter the value of the applied weight.
22. The scale shows “LL-02
LL-02LL-02
LL-02”. Apply the second weight. With the second weight
stable on the hook, press the zero key. Then enter the value of the applied
weight.
23. The scale shows “LL-03
LL-03LL-03
LL-03”. Apply the third weight. With the third weight stable
on the hook, press the zero key. Then enter the value of the applied weight.
Finish
•The new calibration information is saved.
24. Return the calibration blocking switch to it's original position (R N). This
prevents accidental entry into the calibration mode.
25. Verify the calibration.
26. Calibration complete.
Legal-for-Trade Sealing
1. On the left side of the CS750, replace the 2 front screws with the drilled screws
provided.
2. Thread a lead & wire seal through the 2 screws on the left side.
3. Crimp the lead seal tightly.
4. On the right side of the CS750, replace the 2 front screws with the drilled screws
provided.
5. Thread a lead & wire seal through the 2 screws on the right side.
6. Crimp the lead seal tightly.

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Troubleshooting
WARNING : Changing some parts on the circuit board may cause a large
change in calibration while others may or may not change the calibration
depending on the nature of the problem.
The reference designators for the IC chips are on the “A/D 20-BIT” board unless
indicated other ise.
Problem: no power nothing on display
Fix:
If nothing can be seen on the display, there is probably no power reaching the
scale circuitry. Possible causes: bad or shorted battery pack, bad switch circuit,
bad voltage regulator, or bad keypad. Power might be reaching the unit, but the
power supply might be shorted by a component or PCB trace in the power
supply circuitry.
Problem: random display (display usually reads “8.8. 8.”)
Fix:
Check crystal (Y1). If the micro-controller is not receiving the correct or any
oscillation, the microprocessor is not able to function properly. Other possibilities
could be bad microprocessor ( 1) or display driver ( 1 & 2 on “GPI DISPLAY”
board) circuitry not functioning.
Problem: low battery indicator won’t turn off (display blinks “LB
LBLB
LB”)
Fix:
The display will be blinking “LB
LBLB
LB”. Check to make sure battery power is too low.
Look at the cells and charger circuit for these problems. If that is not the cause,
the display driver ( 1 & 2 on the GPI display board) or low voltage circuitry
could be bad.

CS750, sers
Rev S, June 2010
Page 20 of 27
Problem: rechargeable battery life has decreased
Fix:
The rechargeable batteries provided by Intercomp are high quality, high capacity
Ni-Cad. However, all Ni-Cad batteries can exhibit some “memory” effects if they
are repeatedly discharged to a certain point before recharging. If your observed
battery life has decreased significantly from its initial performance, you may want
to try this battery-conditioning sequence: Fully discharge the batteries by
running the CS750 until the display blinks “LB
LBLB
LB” (low battery) and keep the unit
powered until the batteries are fully discharged. Following this, recharge the
battery completely (typical charge time is 16 hours). This discharge/recharge
cycle may need to be repeated. If this does not help, you may need to replace
the Ni-Cad batteries.
Problem: scale shuts off by itself
Fix:
Check the battery holder terminals. They may be bent and not making solid
contact. If the scale turns off immediately after you take your finger off the
button, there may be defective power circuitry or a bad keypad.
Problem: scale “locks up”
Fix:
The microprocessor ( 1) may need to be replaced. The microprocessor support
circuitry could also be bad.
Problem: weights jump or drift
Fix:
Try increasing the sample rate as described in the calibration section (pg 13). If
this does not help, the problem could be a bad load cell, defective amplifier ( 5),
bad A/D chip ( 6), or contamination on the circuit board.