Snap-on Incorporated EEWB314A Manuale utente

Service Manual

SEPTEMBER 2005

WHEEL BALANCER

EEWB314A, EEWB525A, EEWB721A

Allinformationcontainedordisclosedinthisdocument

is considered confidential and proprietary by Snap-on

Tools Company. All manufacturing, use, reproduction,

and sales rights are reserved by Snap-on Tools

Company and the information contained herein shall

not be used in whole or in part without the express

written consent of Snap-on Tools Company.

Effective

09/2005

Table Contents

INTRODUCTION

GENERAL ..........................................................................................................................................................I

FUNCTIONAL DESCRIPTION...........................................................................................................................I

BASIC BALANCER OPERATION................................................................................................................I

WEIGHT APPLICATION ..............................................................................................................................I

ALLOY MODES ...........................................................................................................................................I

ALU-S MODE ..............................................................................................................................................I

DISPLAY / CONTROL PANEL .....................................................................................................................I

GENERAL SPECIFICATIONS AND MACHINE FEATURES.............................................................................II

MAJOR FEATURES ...................................................................................................................................II

SPECIFICATIONS ......................................................................................................................................II

STANDARD EQUIPMENT ..........................................................................................................................II

ELECTRICAL SAFETY PRECAUTIONS ........................................................................................................ IV

SERVICE GUIDELINES / HANDLING STATIC SENSITIVE PCB’S................................................................ IV

CHAPTER 1 AC/DC POWER DISTRIBUTION

LOCKOUT AND/OR TAGOUT SYSTEM PROCEDURE............................................................................... 1-1

ELECTRICAL REQUIREMENTS .................................................................................................................. 1-1

AC / DC DISTRIBUTION............................................................................................................................... 1-2

DC THEORY OF OPERATION ..................................................................................................................... 1-2

PROCESSOR BOARD ........................................................................................................................... 1-2

ENCODER BOARD ................................................................................................................................ 1-2

DISTANCE POTENTIOMETER.............................................................................................................. 1-2

TRANSDUCERS .................................................................................................................................... 1-2

DISPLAY BOARD ................................................................................................................................... 1-2

KEYPAD ................................................................................................................................................. 1-2

PROCESSOR PCB....................................................................................................................................... 1-4

KEYPAD SCHEMATIC .................................................................................................................................. 1-4

TROUBLESHOOTING.................................................................................................................................. 1-5

CHAPTER 2 THEORY OF OPERATION

FUNCTIONAL DESCRIPTION...................................................................................................................... 2-1

TERMINOLOGY............................................................................................................................................ 2-2

BALANCER COMPONENTS ........................................................................................................................ 2-3

UPPER DISPLAY.................................................................................................................................... 2-3

MAIN PROCESSOR PCB ...................................................................................................................... 2-3

POWER SUPPLY PCB........................................................................................................................... 2-3

KEYPAD ................................................................................................................................................. 2-3

DISPLAY PCB......................................................................................................................................... 2-3

TEMPERATURE SENSOR..................................................................................................................... 2-3

TRANSDUCERS .................................................................................................................................... 2-3

VOLTAGE REGUALTOR ........................................................................................................................ 2-3

ENCODER.............................................................................................................................................. 2-4

ELECTRONIC BRAKE ........................................................................................................................... 2-4

SAPE (SEMI-AUTOMATIC-PARAMETER-ENTRY) ............................................................................... 2-4

VIBRATORY SYSTEM............................................................................................................................ 2-4

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CHAPTER 3 CHECKOUT, CALIBRATION AND MAINTENANCE

SHAFT IMBALANCE, WHEEL ADAPTER TO SHAFT REMOUNT TEST .................................................... 3-1

TOOLS REQUIRED WHEN SERVICING THE HANDSPIN BALANCER ..................................................... 3-2

OTHER SUPPLIES................................................................................................................................. 3-2

FUNCTIONS OF HAND SPIN BALANCER .................................................................................................. 3-3

SERVICE CODES .................................................................................................................................. 3-3

P CODE DESCRIPTIONS OF THE BALANCER .......................................................................................... 3-4

P2 RIM WIDTH INCH / MILLIMETER..................................................................................................... 3-4

P3 GRAM / OUNCE................................................................................................................................ 3-4

P4 CALIBRATION WITH ADAPTER OR DISABLE ADAPTER COMPENSATION ................................ 3-4

P7 TOGGLE MILLIMETER AND INCH FOR DIAMETER....................................................................... 3-4

P12 READ COUNTERS. ........................................................................................................................ 3-4

P14 USER CALIBRATION PROCEDURE.............................................................................................. 3-5

P18 ALU-S MODE .................................................................................................................................. 3-6

P19 ALU-S SINGLE PLANE BALANCING MODE ................................................................................. 3-6

P20 TOGGLE VEHICLE / MOTORCYCLE SOFTWARE........................................................................ 3-6

P21 KERNEL SOFTWARE..................................................................................................................... 3-6

P28 KERNEL ERROR MESSAGES ....................................................................................................... 3-6

P36 TOGGLE ANGLES OF LEFT AND RIGHT WEIGHTS. ................................................................... 3-6

P43 RESETTING THE COUNTERS ...................................................................................................... 3-6

P44 READ OR RESET PRODUCTIVITY OF USER .............................................................................. 3-6

P50 READ OUTPUT VOLTAGE OF POTENTIOMETER OF SAPE....................................................... 3-7

P53 DISPLAY TEST ............................................................................................................................... 3-7

P59 DISPLAYS THE UNBALANCE OF THE BARE SHAFT .................................................................. 3-7

P64 DISPLAYS THE TRANSDUCER OUTPUT ..................................................................................... 3-7

P74 READ SHAFT POSITION AND ANGLE .......................................................................................... 3-7

P80 SAPE GAUGE CALIBRATION ........................................................................................................ 3-7

P 83 FACTORY CALIBRATION PROCEDURE ...................................................................................... 3-8

P84 EMPTY SHAFT CALIBRATION PROCEDURE............................................................................. 3-10

P85 COPY CONTENTS OF MAIN PCB TO ENCODER, ONLY AVAILABLE IN INITIALIZATION........ 3-10

P86 COPY CONTENTS OF ENCODER TO MAIN PCB, ONLY AVAILABLE IN INITIALIZATION........ 3-10

P90 MATCH BALANCE ........................................................................................................................ 3-10

P91 OPTIMIZATION ............................................................................................................................. 3-10

P 95 CLEAN & RESET EEPROM 1 & 2 ............................................................................................... 3-10

SERVICING THE BALANCER .....................................................................................................................3-11

CONTROL PANEL REMOVAL AND REPLACEMENT ..........................................................................3-11

MAIN PROCESSOR REPLACEMENT................................................................................................. 3-12

TRANSDUCER REMOVAL................................................................................................................... 3-13

INSTALLATION OF TRANSDUCER..................................................................................................... 3-13

BRAKE SOLENOID .............................................................................................................................. 3-14

BRAKE SOLENOID ADJUSTMENT ..................................................................................................... 3-14

SHAFT BRAKE BAND.......................................................................................................................... 3-14

SAPE SYSTEM .................................................................................................................................... 3-15

Page i

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INTRODUCTION

GENERAL

The EEWB525A and EEWB721A wheel balancer is designed to compute static and dynamic imbalance of

car, light truck, motorcycle and truck wheels. For a more detailed description of each application see the

Operators Manual

FUNCTIONAL DESCRIPTION

BASIC BALANCER OPERATION

Once the balancer reaches balancing speed (120 RPM) a tone will sound, this alerts the operator to release

the handle. The balacers display will show “Spn”, calculation is done at this time. Once the weight imbal-

ance and location is known the balancer will send 12VDC to a brake solenoid braking the the shaft and

bringing the shaft to a stop. Imbalance amounts and corrective weight locations will be shown on the

display.

WEIGHTAPPLICATION

Rotate the wheel until the center green LED in the right hand row of LEDs illuminates. Apply the corrective

weight at top dead center (12 o'clock position) on the right side of the wheel. Repeat this process for the left

side of the wheel referring to the left LED’s.

ALLOY MODES

In addition to the standard Dynamic and Static modes there are 5 Alloy modes, each of which are illustrated

by LEDs on the balancer touch panel when activated. These modes are used for vehicle tire and wheels.

Alloy modes 1 through 5 are accessed by first toggling the MODE key until the balancing mode desired is

displayed. See the Operator's Manual for an explanation of Alloy Mode balancing. The last used mode will

again be used even when power is cycled.

ALU-S MODE

ALU-S mode balancing allows the operator to balance custom wheels in a true dynamic mode using con-

cealed weights while maintaining specified weight separation. See the Operator's Manual for an explanation

of ALU-S mode balancing.

DISPLAY / CONTROL PANEL

The display of the hand spin balancer shows weight amount and position for counterbalancing, plus acts as

a message center for the operator of the machine or for the technician who is repairing the machine.

The balancer may be controlled either manually or automatically. SAPE inputs for wheel distance is nor-

mally automatic and is entered when the SAPE is drawn out and the gauge finger touched to the wheel and

returned to the nested position. If the automatic features of the SAPE are nonfunctional, parameter informa-

tion may be entered manually.

INTRODUCTION

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09/2005

GENERAL SPECIFICATIONS AND MACHINE FEATURES

MAJOR FEATURES

Auto Brake After Measuring Cycle

Two Window Display

Easy Electronic Access

SAPE (1d) Auto Distance Parameter Entry

Membrane Panel Data Entry

Four (4) Mounting Cones

ALU-S Function

Quick Nut With Speed Knobs

Match Balance

Total Spin Counter

Calibration Counter

Resettable Counter

Operator Productivity Counter

2 Operator Mode

SPECIFICATIONS

Shaft size: 28.5mm (1 1/16”)

Balance (shaft) speed: 90RPM

Cycle time: 15 seconds with an 'average' 14" tire & wheel combination

Balance Types: Five 2-plane alloy modes, plus static, dynamic and Match Balance modes.

Accuracy: 0.1 oz. (2.8g)

Weight Positioning resolution: 0.7 degrees

Rim Width capacity: 3"-20" (406mm)

Rim Diameter capacity: 6"-30" (152mm-660mm)

Maximum Tire Diameter: 44" (1118 mm)

Maximum Tire Width: 20" (483 mm)

Tire Weight: 120 lbs. (54.5kg)

Shipping Weight: 170 lbs. (77kg)

Power requirements: 115 / 230 VAC; 60 hz; 2 amp

STANDARD EQUIPMENT

EAA0247G21A- Rim Width Caliper

EAM0005D40A- Calibration Weight

EAA0260D63A- Standard Adapter Kit (4 cone system - 1.66" - 5.25", clamping hood, quick nut) See Part

Reference for individual part listings.

Page iii

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IMPORTANT SAFETY INSTRUCTIONS

When using this equipment, basic safety precautions should always be followed,

including the following:

1. Read all instructions.

2. Donotoperateequipmentwithadamagedpowercordoriftheequipmenthasbeen

damaged - until it has been examined by a qualified authorized service technician.

3. If an extension cord is used, a cord with a current rating equal to or more than that

of the machine should be used. Cords rated for less current than the equipment

mayoverheat. Careshouldbetakentoarrangethecordsothatitwillnotbetripped

over or pulled.

4. Always unplug equipment from electrical outlet when not in use. Never use the

cord to pull the plug from the outlet. Grasp plug and pull to disconnect.

5. To reduce the risk of fire, do not operate equipment in the vicinity of open

containers of flammable liquids (gasoline).

6. Keephair,loosefittingclothing,fingersandallpartsofthebodyawayfrommoving

parts.

7. Adequate ventilation should be provided when working on operating internal

combustion engines.

8. To reduce the risk of electric shock, do not use on wet surfaces or expose to rain.

9. Do not hammer on or hit any part of the control panel with weight pliers.

10. Do not allow unauthorized personnel to operate the equipment.

11. Use only as described in this manual. Use only manufacturer’s recommended

attachments.

12. Always securely tighten the wing nut before spinning the shaft.

13. ALWAYS WEAR SAFETY GLASSES. Everyday eyeglasses only have impact

resistant lenses, they are NOT safety glasses.

14. Balancer is for indoor use only.

SAVE THESE INSTRUCTIONS

INTRODUCTION

Page iv Effective

09/2005

ELECTRICAL SAFETY PRECAUTIONS

Make sure the balancer is unplugged before disconnecting any wires in preparation for replacing any

boards, cables or other items within the unit. Use the “Lockout and/or Tagout” procedure.

SERVICE GUIDELINES / HANDLING STATIC SENSITIVE PCB’S

Electrostatic discharge can destroy high impedance ICs if uncontrolled. Use the fol-

lowing techniques to avoid damaging ICs:

- Leave new circuit boards in their antistatic bags until ready for use.

- When replacing boards, proms, etc. be sure to turn off power to the machine first

- Use an anti-static wrist strap. Connect it to chassis ground on the equipment or to an available raw ground.

- Touch the chassis of the equipment to put yourself at the same static potential as the equipment.

- Grasp the PCB from opposite sides using your fingertips. Do not grasp the components on the board.

When inserting PCB’s:

- Place boards on a grounded static mat after removal.

- Remove the new PCB from the original package onto a grounded static mat. Save packaging to use

when returning defective boards.

- Remove power from the machine (un-plug from wall) before installing the PCB.

- Avoid handling components needlessly.

- Do not set PCBs on insulating surfaces such as paper, glass, rubber, or plastic.

- Static is generated by friction. The following actions promote static generation:

- Wearing silk or nylon clothing.

- Walking on carpets.

- Walking with rubber soled shoes.

Static generation is increased when certain environmental conditions exist. Conditions of low humidity

combined with wearing silks or nylons, walking on carpets, or walking with rubber soled shoes may create

large electrostatic charges on your person, capable of blowing a hole in the substrate of an IC.

Page 1-1

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CHAPTER 1

AC/DCPOWER DISTRIBUTION

LOCKOUT AND/OR TAGOUT SYSTEM PROCEDURE

1. Notify all affected employees that a lockout or tagout system is going to be utilized and why. The autho-

rized employee should know the electrical power the machine uses and it’s hazards.

2. If the machine or equipment is running, shut it down by the normal stopping procedure (depress the stop

button, open toggle switch, etc.)

3. Use appropriate devices to isolate the equipment from the power source(s). Stored energy (such as that

in springs, elevated machine members, rotating flywheels, hydraulic systems, and air gas, steam or water

pressure, etc.) must be dissipated or restrained by methods such as repositioning, blocking, bleeding

down, etc.

4. Lockout and/or tagout the energy isolating devices with individual lock(s) or tag(s).

5. After ensuring that no personnel are exposed, and as a check on having disconnected the energy

sources, operate the push button or other normal operating controls to make certain the equipment will not

operate. CAUTION: RETURN OPERATING CONTROL(S) TO “NEUTRAL” OR “OFF” POSITION

AFTER THE TEST [DE-ENERGIZED STATE].

6. The equipment is now locked out or tagged out.

ELECTRICAL REQUIREMENTS

NOTE: ANY ELECTRICAL WIRING MUST BE PERFORMED BY LICENSED PERSONNEL.

ALL SERVICE MUST BE PERFORMED BY AN AUTHORIZED SERVICE TECHNICIAN.

Check on the plate of the machine that the electrical specifications of the power source are the same as the

machine.The balancerrequires 115VAC, 50-60Hz, 1Ph,2.0Ampere. A230VACadapteris available if

required.

The balancer will also take a rechargeable portable battery pack (Versavolt). The input is able to accept a

12V, 14.4 or 18V versavolt battery pack. These are the same batteries used on the Snapon’s power tools.

NOTE: THIS MACHINE PERFORMS A SELF-TEST ROUTINE ON START-UP. THERE WILL BE ADELAY

OF SEVERAL SECONDS BEFORE THE DISPLAY IS ACTIVATED.

NOTE: ANY ELECTRICAL OUTLET INSTALLATION MUST BE VERIFIED BY A LICENSED ELECTRI-

CIAN BEFORE CONNECTING THE BALANCER.

NOTE: CHECK THAT IF ANAUTOMATIC GROUND FAULT CIRCUIT BREAKER WITH ADIFFERENTIAL

CIRCUIT IS BEING USED THAT IT BE SET AT 30 MA.

Page 1-2

CHAPTER 1 AC/DC POWER DISTRIBUTION

Effective

09/2005

AC / DC DISTRIBUTION

The balancer is supplied with a power transformer. It is critical to have the proper input voltage in order for the

balncerto operate correctly. Thetransformer is ratedat 9VAC @1900 milliamps. 9VAC is suppliedto the Power

Supply pcb. The 9VAC passed through a bridge rectifier converting it into 12VDC. The 12VDC then is passed

through a voltage regulator coverting it into 5VDC which is used to power the processor pcb, display pcb and the

encoderpcb.

The processor pcb, display pcb and encoder all have an LED which signals that the pcb is receiving 5VDC

power.

To check power cable:

•Disconnect the power supply.

•Using a VOM, check for an output voltage at the end of the power plug 9VAC +/- 1VAC.

The electronic brake is controlled by a 12VDC solenoid. While the balancer is spinning, the main processor pcb

is gathering information from the encoder and transducers. After the needed information is gathered the main

pcb sends a signal to the power supply pcb which sends 12VDC to the brake solenoid braking the balancer and

bringing the shaft to a stop. This 12VDC can be checked at either X23 on the power supply pcb or directly at the

brake solenoid. 12VDC is only present during the brake cycle of the balancer.

DC THEORY OF OPERATION

PROCESSOR BOARD

The operating voltage for the Main Processor is 5VDC. It receives this power from the Power Supply Board

at X1 pins 32 and 34. This 5 volts also passes through the Processor Board and supplies the Encoder PCB

and the Distance SAPE.

ENCODER BOARD

The encoder receives 5VDC from the Processor Board. This voltage can be measured at the Processor

Board at X3 pin 6. The encoder is built so that there are no adjustments. The encoder disk is built onto the

shaft and cannot be replaced without replacing the vibratory member. The encoder is fitted in the vibratory

tube and consists of a reflective slotted sleeve which is mounted on the main shaft and the optoelectronic

unit.

DISTANCE POTENTIOMETER

The distance potentiometer is a 5K pot. It is supplied 5VDC from the main processor. This input voltage can

be measured at the Processor Board X6 pin 3. The output voltage is dependent upon the deflection of the

guage from the home position.

TRANSDUCERS

The transducers are installed in a manner that it forms a virtual transducer on each end of the shaft. This

configuration gives the balancer greater accuracy along with minimal amount of erroneous readings. Both

measuring transducers are arranged in one plane. The tranducers produce a DC output. The DC voltage that

is generated is sent back to the processor.

DISPLAY BOARD

The Display Board receives 5VDC from the Power Supply Board. This 5 volts can be checked at the harness

of the display board X2 pin 6 or at the Power Supply Board X2 pin 6.

KEYPAD

Thekeypad allowsoperator inputto the Main Processor Board. The output signal passes through the Power

Supply Board directly to the Main Processor.

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