Hofmann ATC 900 User manual

CTC-CEN Service Manual 07-13 Rev.E
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ATC 900 – CENTAUR –
MONTY 8600 – VULCAN PRO
SERVICE MANUAL
DO NOT COPY NOR DISTRIBUTE
No part of this document may be photocopied, reproduced, or translated
without prior written consent of Snap-on

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BLANK PAGE

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TABLE OF CONTENTS
CHAPTER 1 INTRODUCTION Pag. 5
1.1 General Pag. 5
CHAPTER 2 TOOLS AND SAFETY Pag. 5
2.1 Tools and special tools required Pag. 5
2.2 Important safety instructions Pag. 6
2.3 Electrical safety precautions Pag. 6
CHAPTER 3 ELECTRIC, PNEUMATIC AND HYDRAULIC DIAGRAMS Pag. 6
3.1 Electric diagram Pag. 7
3.2 Pneumatic diagram Pag. 8
CHAPTER 4 AC/DC POWER DISTRIBUTION Pag. 9
4.1 Lockout and/or tagout system procedure Pag. 9
4.2 Electrical requirements Pag. 9
4.3 AC Theoy of operation Pag. 9
4.4 DC Theory of operation Pag. 11
CHAPTER 5 ELECTRIC SECTION Pag. 13
5.1 Power supply cable and plug: check and replacement Pag. 13
5.2 Main rotary switch Q2 # 2-15359A: check and replacement Pag. 14
5.3 Centerpost motor M3 cable: check and replacement Pag. 15
5.4 Centerpost motor M3 # 2-49166A and belt # 8-06831A: check and replacement Pag. 16
5.5 Lower bead breaker arm actuator M1 # EAA0377G02A: check and replacement Pag. 17
5.6 Transformer T3 # 7-02702A: check and replacement Pag. 19
5.7 Centerpost switch S1 # 2-15259A: check and replacement Pag. 20
CHAPTER 6 ELECTRONIC SECTION Pag. 24
6.1 Inverter T1 # EAA0358G49A: check and replacement Pag. 24
6.2 Inverter T1 # EAA0358G49A: Firmware update Pag. 25
6.3 CPU board A1: check and replacement Pag. 32
6.4 Bead breaker arms potentiometer B1 and B2 # EAA0377G07A:
check and replacement Pag.32
6.5 Procedure to adjust bead breaker disks alignment Pag. 35
6.6 Bead breaker arms potentiometers calibration Rev.C Pag. 36
CHAPTER 7 PNEUMATIC SECTION Pag. 41
7.1 Pneumatic function Pag. 41
7.2 Air filter – lubricator assy # EAA0350G85A: check and replacement Pag. 42
7.3 Opening arm cylinder # EAA0350G44A: check and replacement Pag. 43
7.4 Valve control opening arm cylinder # EAA0356G96A:check and replacement Pag. 44
7.5 Vertical blocking cylinder # EAA0344G32A: check and replacement Pag. 45
7.6 Horizontal blocking cylinder # EAA0344G33A: check and replacement Pag. 47
7.7 Vertical rod lift cylinder # EAA0363G79A: check and replacement Pag. 48
7.8 Valve # EAA0338G09A: check and replacement Pag. 48
7.9 Automatic tool cylinder # EAA0363G81A: check and replacement Pag. 50
7.10 Automatic tool cylinder valve # EAA0328G73A: check and replacement Pag. 51
7.11 Bead breaker cylinders # EAA0363G62A / EAA0351G77A: check and replacement Pag. 52
7.12 Bead breaker cylinders and discs valves: # EAA0350G58A / EAA0377G25A:
check and replacement Pag. 54
7.13 Bead breaker arms blocking cylinder # EAA0344G48A: check and replacement Pag. 55
7.14 Bead breaker arms valve blocking # EAA0377G26A: check and replacement Pag. 58
7.15 Wheel lift cylinder # EAA0344G93A: check and replacement Pag. 59
7.16 Wheel lift valve # EAA0349G00A: check and replacement Pag. 61
7.17 MH cylinder # EAA0345G61A: check and replacement Pag. 62
7.18 MH cylinder control valve # EAA0328G73A: check and replacement Pag. 63
7.19 Bead inflating valve # EAA0329G75A: check and replacement Pag. 64
7.20 Bead blaster valve # 1-29581A and air tank: check and replacement Pag. 65
7.21 Air control# EAA0350G54: check and replacement Pag. 65

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7.22 Manometer: Check and replacement Pag. 66
7.23 Spiral pipes: Check and replacement Pag. 68
CHAPTER 8 MECHNICAL SECTION Pag. 70
8.0 Mechanical section Pag. 70
8.1 Opening arm bushings # 1-10065A check and replacement Pag. 70
8.1.1 Opening arm bushings # 1-10065A check and adjustment Pag. 74
8.2 Automatic tool # EAA0356G25A: check, replacement and adjustment Pag. 75
8.3 Horizontal arm rollers: check and adjustment Pag. 80
8.4 Gear box # EAA0347G76A: check and replacement Pag. 80
8.5 Bead breaker discs # EAM0065G63A: Check and replacement Pag. 81
8.6 Bead breaker discs # EAM0065G63A: Check and replacement Pag. 82
8.7 Bead breaker discs bearing # 1-06963A: Check and replacement Pag. 83
8.8 Bead breaker discs inclination adjustment. Pag. 84
8.9 Bead breaker discs clearance: Check and adjustment Pag. 85
8.10 Bead breaker carriage: Check and adjustment Pag. 87
8.11 Lead screw nut # EAM0076G10A: Check and adjustment Pag. 87
CHAPTER 9 TROUBLE SHOOTING Pag. 89
CHAPTER 10 SERVICE BULLETINS Pag. 92

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CHAPTER 1
INTRODUCTION
1.1 GENERAL
This Service Manual describes maintenance, check and repair operations of the Dual bead breaker and Automatic
tool tire changer platform under Hofmann, John Bean and Boxer brands and is for use of qualified and trained
personnel only.
Keep this manual constantly updated, by adding Service Bulletins related to the tire changers.
IMPORTANT!
The identification data of each machine are printed on a adhesive label attached to the cabinet of the machines.
The serial number is a sequence of figures standing for the manufacturing month and year the first four numbers,
followed by the machine part number made of 7 numbers and finally the progressive serial number of the machine
manufactured with this specific part number.
In the sections dedicated to the check, replacement and adjustment of the components there will be reported some
symbols as follows:
: Total amount of working time required to check, replace and adjust the components: this time is
calculated considering the standard installation condition provided by the operator manual.
: List of tools required to perform the work.
: Information related to the possible failure/malfunction caused by the component
CHAPTER 2
TOOLS AND SAFETY
2.1 TOOLS AND SPECIAL TOOLS
To repair and/or check these tire changer, the following standard tools are required:
Keys : 6mm to 30mm
Tube type keys : 7mm to 17mm
Allen keys : 2.5 mm to 12 mm
Socket keys : 17mm to 24mm
Allen socket keys : 8mm to 12mm
Screw drivers : Flat bed and Phillips from 1 to 5
Multimeter : AC, DC, A, Ohm, pF
Lotctite and mechanical extractor
Special tools that are required for specific tasks are:
Ring nut socket keys:
There are 4 different keys: 10mm, 17mm, 20mm and 25mm.
Use these keys to tight or loose the knees ring nuts.

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Electronic inclinometer:
Use the electronic level to adjust the bead breaker disc inclination
Kit Inverter firmware update # EAK0306G03A.
Use this kit to update directly on site the firmware of the Snap On Inverters instead to replace it
2.2 MPORTANT SAFETY INSTRUCTIONS
The units are CE or UL approved, but whenever using this equipment basic safety precautions should always be
followed, including the following:
1. Read all instructions.
2. Do not operate equipment with a damaged power cord or if the equipment has been 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 may overheat. Care should be taken to arrange the cord
so that it will not be tripped 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. Keep hair, loose fitting clothing, fingers and all parts of the body away from moving 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 box and portable control.
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 lock the wheel before starting the operation.
13. ALWAYS WEAR SAFETY GLASSES. Everyday eyeglasses only have impact resistant lenses, they are NOT
safety glasses.
14. Easy tire changer is for indoor use only.
2.3ELECTRICAL SAFETY PRECAUTIONS
Make sure the tire changer is unplugged before disconnecting any wires in preparation for replacing any electric
mechanic components, cables or other items within the unit
CHAPTER 3
ELECTRIC, AND PNEUMATIC DIAGRAMS

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ELECTRIC DIAGRAM

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PNEUMATIC DIAGRAMS

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CHAPTER 4
AC/DC POWER DISTRIBUTION
4.1 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 authorized
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.
4.2 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 that of the
machine.
NOTE: ANY ELECTRICAL OUTLET INSTALLATION MUST BE VERIFIED BY A LICENSED ELECTRICIAN
BEFORE CONNECTING THE TIRE CHANGER.
NOTE: ENSURE THAT THE OUTLET HAS AN AUTOMATIC GROUND FAULT CIRCUIT BREAKER WITH A
DIFFERENTIAL CIRCUIT SET AT 30 MA.
4.3 AC THEORY OF OPERATIONS
Always use the “One Hand Rule” when working with AC voltages by keeping one hand in your pocket or behind
your back. Before removing wires from the tire changer, always verify that the unit is “OFF”. Turn off the Main Power
Switch on the back and unplug the AC power cord from the AC outlet.
AC DISTRIBUTION
All Easy platform tire changers are equipped by one 230 VAC three phase turntable motor.
The voltage at which the machine is wired is printed on the serial number plate and on a tag at the end of the power
cord.
The power cord has 3 wires:
N = Neutral
L1 = Phases
PE (yellow/green) = Ground
The machines can work at 50 or 60 Hertz.
The 230 (+/-10%) AC voltage comes in through a “ON/OFF” Power Switch placed on the electronic box cover and
immediately is sent via to an anti disturb filter to the Inverter and to the transformer.

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TRANSFORMER T3
It transforms the 230VAC in 18VAC to supply the CPU board A1
through the connector X2.
INVERTER T1
It supplies 230/3 to the turntable motor M3 and change the motor
rotational speed from 50 to 100Hz.
CENTERPOST SWITCH S1
The switch forward the rotational and speed input to the inverter T1 for
the motor M3.

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CENTERPOST MOTOR M3
It is 1,5 Hp, 3 phase single speed motor and it is supplied by
the inverter T1.
4.4 DC THEORY OF OPERATIONS
PROCESSOR BOARD A1
The processor board A1 (CPU) is placed inside of the
electronic box and it is directly supplied at 18 VAC by the transformer
T3. A fuse avoid damaging in case of overcurrent from the transformer.
The CPU board manages all input from / to the bead breaker arms
potentiometers, the lower bead breaker arm actuator and the laser
pointer.
BEAD BREAKER ARMS POTENZIOMETERS B1 AND B2
The bead breaker arm potentiometers are 3 turns type – 5K first batch,
10K the present one, and they are supplied at 5 VDC by the CPU
board.
They control the position of the bead breaker arms in order to allow a
constant alignment of the bead breaker discs.
LOWER BEAD BREAKER ARM ACTUATOR M2
The lower bead breaker arm actuator M1 is controlled by the CPU
board through the potentiometers. It supplied at 24VDC and allows the
forward / backward lower bead breaker arm sliding as soon as the
upper one is moved by the operator.

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LASER POINTER
The laser pointer is directly supplied by the CPU board through the
connectors X4 and X5.
It is used to make an easier positioning of the tool on the rim edge.
WARNING!
LASER RADIATION
CLASS 2 LASER PRODUCT
1mW 650 nm CW
DO NOT STARE INTO BEAM
IEC 60825-1:2007

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CHAPTER 5
ELECTRIC SECTION
WARNING!
BEFORE APPROACHING THE ELECTRIC PARTS OF THE MACHINE,
DISCONNECT THE MACHINE FROM ELECTRIC SUPPLY
Very often electric failures are only caused by loosened wires or connectors not well fitted.
Therefore it is VERY IMPORTANT BEFORE STARTING WITH ANY CONTROL AND/OR REPLACEMENT VERIFY
IF ALL WIRES AND CONNECTORS ARE WELL FITTED.
5.1 POWER SUPPLY CABLE AND PLUG: CHECK AND REPLACEMENT
: 1h
: Allen keys of 3 and 5mm, small and medium screwdriver, medium cross screwdriver, faston pliers, scissors,
pliers, multimeter.
: Defective power supply cable and plug may cause the following malfunction:
1. Turning the switch on, the electric functions of machine do not work.
TO CHECK THE CABLE:
Disconnect power supply.
Remove the plug form the wall.
Loosen the screw to remove switch knob.
Remove the disc acting with a screwdriver on the side tabs
Loose the screws and remove the frame switch.
Take the switch out from the inverter box.

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Check wires continuity from power supply plug to main switch wires terminals.
IMPORTANT! TO CHECK GROUND (YELLOW/GREEN) WIRE, DISCONNECT THE WIRE END FROM THE
TERMINAL BLOCK.
TO REPLACE THE CABLE:
Disconnect the power supply wires from the plug and switch teminals.
Disconnect the ground wire from terminal block.
Release cable strain relief from the inverter box.
Remove plug from cord and take the defective cable away.
Insert the new cable through the strain relief.
IMPORTANT! USE ONLY APPROVED CABLES, PLUGS. GROUND WIRE MUST BE LONGER THAN THE
OTHER ONES.
Fix new faston on inside cable ends and connect them to the switch terminals and to the plug.
Fix the main switch to the electronic box.
Install the disc.
Mount again the switch knob and cover of the screw.
Connect the ground wire to ground terminal block.
Install plug.
Tighten strain relief FIRMLY.
Plug the machine to the wall.
Check if the machine works fine.
Fix the inverter box again to the cabinet.
5.2 MAIN ROTARY SWITCH Q1 # 2-15359A: CHECK AND REPLACEMENT
: 0,5h
: Allen keys of 3 and 5mm, small and medium screwdriver, medium cross screwdriver, faston pliers, scissors,
pliers, multimeter
: Defective main switch may cause the following malfunction:
1. Turning the switch on the machine does not run at all.
2. Turning the machine on the building main switch shuts off.
TO CHECK THE SWITCH:
Disconnect power supply.
Remove the switch from the electronic box 5.1
Disconnect all wires from the main switch and remove it with a
screwdriver.
Turn switch to “Off”. Check that there is no continuity (Ω =infinity)
between any terminals 1,2,3 and 4.
Turn switch to “On”. Check that there is continuity between
terminals 1-2 and 3-4 (Ω = 0 ~ 0,3) and discontinuity between terminals
1-3 and 1-4, as well as 2-3 and 2-4
If there is continuity the switch is in short circuit. It must be replaced.

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TO REPLACE THE SWITCH:
Check that the tabs for contacts on the new switch are correctly oriented.
Connect wires ends FIRMLY to the new switch terminals as shown in the appropriate electric diagram (3.0).
Mount the switch to the electronic box 5.1.
Check if the machine works fine.
5.3 CENTERPOST MOTOR M3 CABLE: CHECK AND REPLACEMENT
: 1h
: Medium screwdrivers, medium cross screwdrivers, 7mm tube type wrench, 4mm allen key, pliers, multimeter
: Defective chuck motor cable may cause the following malfunction:
1. Low rotational torque.
2. Noisy motor.
3. Motor damaging (burning).
TO CHECK THE CABLE:
Disconnect power supply from the wall.
Open the electric box.
Disconnect the wires white, brown and black from the Inverter.
Remove the front motor protection to access to the centerpost motor
Remove the motor terminals cover and disconnect all wires from
terminals.
Select the multimeter in Ohm and check if there is continuity
between ends of each wire.

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TO REPLACE THE CABLE:
Release cable strain relief on the electric box and on the motor.
Take the wrong cable away.
Insert the new cable through the strain relief.
IMPORTANT! USE ONLY APPROVED CABLE. GROUND WIRE MUST BE LITTLE
LONGER THAN THE OTHER ONES TO ALLOW THE GROUND IN CASE OF PHASE
CABLE BREAKAGE.
NOTE: Before connecting the wires ends, tighten all terminals nuts on the motor.
Fix new fastons to the cable ends.
Connect the wires to the motor and inverter terminals.
Mount the motor terminal cover and the electronic box cover.
IMPORTANT: WHEN REMOUNTING THE MOTOR TERMINALS COVER BE CAREFUL NOT TO CRUSH
WIRES.
Plug the machine to wall.
Turn the machine on and check if it works fine.
Mount the front motor cover.
5.4 CENTERPOST MOTOR M3 # 2-49166A AND BELT # 8-06831A: CHECK AND
REPLACEMENT
: 1h
: End keys 13,17mm, medium cross screwdriver, 7mm tube type wrenches, 3 and 4mm allen key, multimeter,
loctite, extractor.
: Defective centerpost motor may cause the following malfunction:
1. Motor is noisy.
2. Motor is burnt.
3. Low turntable torque.
TO CECK THE CENTERPOST MOTOR WHEN IT SHOWS LOW TORQUE OR IT IS NOISY:
Refer to paragraph 5.3
TO CHECK THE CENTERPOST MOTOR WHEN IT IS NOISY:
Disconnect power supply from the wall.
Remove the front motor protection to access to the centerpost motor 5.3.
Loosen the 12mm nuts to get motor loose and remove the belt.
Insert a screwdriver through the fan protection and turn
the motor pulley by hand to make sure that the fan is well blocked
to the motor shaft.
Plug the machine to the power supply.
Turn the machine on.
MACHINE UNDER TENSION DANGER
OF ELECTRIC SHOCK
Run the centerpost motor to verify if it is noisy
TO CHECK THE CENTERPOST MOTOR WHEN IT IS BURNT:
Refer to paragraph 5.3 to make sure about the wiring and the cable.
Remove all wires and connections from the motor terminal.

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Select the multimeter in Ohm and check if there is continuity between all terminals of the motor. If there
continuity the motor must be replaced.
TO REPLACE THE CENTERPOST MOTOR:
Remove the two bolts in the bottom to get the motor assembly free.
Remove the pulley set screws.
Remove the pulley by using an extractor tool.
Remove the motor from its support.
Take the new motor.
Install the pulley by using rubber hammer.
NOTE: The mounting of the new pulley must be done very carefully in
order to avoid motor bearings damaging.
Install the motor on its support.
Install the motor assy on the machine and lock it firmly.
Mount the belt.
Adjust the belt tension
Connect the wires FIRMLY to motor terminals following the
voltage at which the machine is supplied.
NOTE: Before connecting the wires ends, tighten all terminals
nuts.
Plug the machine to the wall.
Turn the machine on.
MACHINE UNDER TENSION DANGER
OF ELECTRIC SHOCK
Check the rotation way of the motor: If it is wrong reverse only two centerpost motor wires.
Turn the machine off and unplug it from the wall.
Mount the motor terminals cover.
IMPORTANT: WHEN REMOUNTING THE MOTOR TERMINALS COVER BE CAREFUL NOT TO CRUSH
WIRES.
Mount all protections and covers.
Turn the machine on again and check if it works fine again.
5.5 LOWER BEAD BREAKER ARM ACTUATOR M1 EAA0377G02A: CHECK AND
REPLACEMENT
: 1,5h
: End keys 13, medium cross screwdriver, 4 and 5mm allen key, multimeter.
: Defective actuator motor may cause the following malfunction:
1. The lower bead breaker arm does not move forward and backward.
TO CHECK THE MOTOR:
Before working on the actuator, make sure that the bead breaker arm is unlocked, cleaned and without any
scratching.
Disconnect machine from power supply.
Open the electric box.
Disconnect the actuator plug from the connector X3 of the CPU board.
Turn the machine on.
MACHINE UNDER TENSION DANGER OF ELECTRIC SHOCK

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Take the Voltmeter and select it in VDC.
Position the Voltmeter probes on the connector terminals X3
coming from the CPU board inside of electric box.
Push the upper bead breaker arm by hand: whenever it will move
the multimeter display should show 24VDC.
If the multimeter display will not show any change of value, the
CPU board must be replaced.
TO REPLACE THE MOTOR:
Turn the machine off.
Remove the protection from the lower bead breaker arm.
Make sure that the bead breaker arm is unlocked
Disconnect the motor from the arm.
Turn the worm screw handily to remove the actuator from the arm.
Remove the cable from electric box.
Remove the cable from the chain.
Move the lower bead breaker arm all inward.
Fix the actuator to arm.
Insert the cable through the chain and connect it to the CPU
board.
Turn the machine on.

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MACHINE UNDER TENSION DANGER OF ELECTRIC SHOCK
Push and pull the upper bead breaker arm by hand inward and
outward to make sure that actuator is running. At the same time
use the 5mm allen key to adjust the alignment of the actuator to
the bead breaker arm.
When the actuator will complete the arm stroke without any speed
reduction, lock the counter nut.
Perform the bead breaker arms calibration.
Turn off the machine.
Install the actuator and the electric box protection.
Turn the machine on and check if it works fine.
5.6 TRANSFORMER T3 # 7-02702A : CHECK AND REPLACEMENT
: 1h
: Voltmeter, small and medium cross screwdrivers, pliers.
: Defective transformer may cause the following malfunction:
1. Smoke gets out from the electric box with consequent burning of the transformer.
2. Turning the machine on the lower bead breaker arm actuator M2 and the laser pointer do not work.
IMPORTANT! BEFORE STARTING WITH THE INSPECTION OF THE TRANSORMER MAKE SURE THAT THE
FUSE IS FINE
TO CHECK THE FUSE:
Disconnect the machine from power supply.
Open the electric box
Pull out the fuse holder by hand from the transformer.
Verify if there is continuity between the ends of the fuse.
If necessary replace it with a new one of the same value.
TO CHECK THE TRANSFORMER:
Disconnect the machine from power supply.
Open the electronic box.
Take the Voltmeter and select it in VAC.
Turn the machine on.
MACHINE UNDER TENSION DANGER OF ELECTRIC SHOCK

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Verify if the power supply among the terminals 0 – 230 is correct.
Make sure that the output among terminals 0 and 18 is correct.
TO REPLACE THE TRANFORMER:
Turn the machine off.
Disconnect the machine from power supply.
Remove all wires from terminals.
IMPORTANT! MARK WIRES PROPERLY FOR AN EASY AND
SAFE INSTALLATION.
Loosen the four transformer screws to release the transformer.
Install the new transformer and tighten firmly all wires.
Turn the machine on.
MACHINE UNDER TENSION DANGER OF ELECTRIC SHOCK
Check if the machine works fine again.
Turn the machine off.
Mount the electric box cover.
Check if the machine works fine.
5.7 CENTERPOST SWITCH S1 # 2-15259A: CHECK, ADJUSTMENT AND REPLACEMENT
: 1h
: Small standard and cross screwdrivers, 4 and 5 mm allen key, 8mm key.
: Defective turntable switch may cause the following malfunction:
1. The turntable does not turn at all.
2. The turntable does not turn in first speed.
3. The turntable does not turn in second speed
4. The turntable does not in reverse speed.
TO CHECK THE SWITCH
Turn the machine off.
Remove the pedal assy cover.