Midmark VetPro1000 Mobile Service manual

Name: Midmark VetPro1000 Mobile
Brand: Midmark
SKU: 7456286
Rating: 4.4 (5 reviews)

4.4 (5)

Midmark VetPro® 1000

Veterinary Dental Cart

Model Numbers:

8000-001

8000-002

8000-003

8000-004

8000-005

8000-006

8000-006S

8000-007

8000-007S

8000-008

8000-008S

Service and

Parts Manual

Present Production Model Shown

FOR USE BY MIDMARK TRAINED TECHNICIANS ONLY

SF-1928

Part No. 004-0586-00 Rev. AA8 (4/3/19)

Table of Contents

Section A General Information

Section B

Symbols.....................................	iii
Ordering Parts...........................	iii
Serial Number Location............	iii
Specifications............................	iv
Model Description.....................	iv
Scheduled Maintenance............	v

Troubleshooting

Compression Cycle.................	A-2
Electrical .................................	A-3
Troubleshooting Chart............	A-5

Testing & Adjustments

Checking for Air Leaks...........	B-2
Water Relay..............................	B-3
Tri-block...................................	B-4
Line Voltage.............................	B-5
Compressor Head...................	B-7
Capacitor..................................	B-8
Check Valve & Solenoid.......	B-10
Pressure Switch....................	B-12
Air Regulator.........................	B-14
Air Tank .................................	B-16
Water System.........................	B-17
Air Intake Filter......................	B-18
Exhaust Muffler.....................	B-20
Foot Control...........................	B-21
LED Light (Scaler).................	B-22
Standard Scaler.....................	B-23
Air/Oil Separator....................	B-24
Fiber Optics (Early Units).....	B-25
Fiber Optics (Current)...........	B-26
Handpiece Holder Adjust......	B-28
Foot Control...........................	B-29

C	Access procedures
C	Upper Compartment	C-2
Section	Upper Compartment	C-2
	Middle Compartment..............	C-3
	Delivery System......................	C-6
	Lower Compartment...............	C-3
	Water System...........................	C-5

D	Wiring & Tubing diagrams
D	Wiring Diagram	D-2*
Section	Wiring Diagram	D-2*
Section	Tubing Diagrams	D-7*
	Tubing Diagrams	D-7*
	Tri-Block Diagram...............	D-12*
	Quad-Block Diagram.............	D-13

E	exploded views & parts lists
Section	exploded views & parts lists
	VetPro® 1000.............................	E-2

(*) Indicates multiple pages due to model / serial number break(s).

004-0586-00 [Revised: dd/mo/yr]

General Information

Symbols

warning

Indicates a potentially hazardous situation which could result in serious injury if not avoided.

Caution

Indicates a potentially hazardous situation which may result in minor or moderate injury if not avoided. It may

also be used to alert against unsafe practices

Equipment Alert

Indicates a potentially hazardous situation which could result in equipment damage if not avoided.

The symbols below may be used in this manual to represent the operational status of table functions and components.

Indicates the function / component is working properly. No action required.

Indicates the function / component is working, but a problem exists.

Indicates the function is not working at all, or that the component is faulty.

Ordering Parts

The following information is required when ordering parts:

•Serial number & model number

•Part number for desired part

(Refer to Section E: Exploded Views & Parts Lists)

Non-warranty parts orders may be faxed to Midmark using the Fax Order Form.

For warranty parts orders, call Midmark’s Technical Service Department with the required information.

Hours: 8:00 am to 5:00 p.m. EST (Monday thru Friday) Phone: 1-800-Midmark

Serial Number Location

Serial Number

Label

Past Production Model Shown

004-0586-00 [Revised: dd/mo/yr]

iii

Specifications

warning

Equipment not suitable for use in the presence of

a flammable anesthetic mixture.

Go To Table Of Contents

Cart

Width	23 inches (58.42 cm)
Length	18 1/2 inches (46.99 cm)
Height	36 1/2 inches (92.71 cm)
Weight	130 lbs (58.97 kg)

Shipping Weight	150 lbs (68.04 kg)

Top of Cart Weight Restriction	25 lbs (11.33 kg)

Electrical (See Regulatory Compliance Chart - Next Page)

Fuse (Scaler Transformer)		800mA, 250 V, 3AG SLO BLO

Power Cord Length		10 ft. Hospital Grade
Handpiece
Connection Type		Midwest 4-Hole Type Handpiece
Compressor
Motor		Oil Free 1/3 HP
Working Pressure		70-100 PSI
Flow Rate		2.5 scfm @ 40 PSI
Sound Level (full load)		40 dB
Air Tank		1 Gallon
Water Module
Reservoirs		Two - 1 Liter - Toggled
Pressurized System		30-40 PSI
Handpiece Flush System		Manual
Air and Water Connections		External Quick Connects
Other
Duty Cycle		Continuous Operation
		Note: Exception, Units with LED
		Scaler, 10 min. ON, 5 min. OFF
Classifications		Class 1, Type B Applied Part,
		Ordinary Equipment [IPXO]

warning

The Acteon Newtron® LED scaler complies with current electromagnetic compatibility standards. However, it must not be used by or on those with cardiac stimulators or other active implants unless adequate electromag-

netic interference shielding is present. Check with a cardiologist to verify the EMI shielding capabilities of the implant. See enclosed Newtron® LED manual for further advisories.

004-0586-00 [Revised: 2/14/14]

Go To Table Of Contents

Model Identification / Compliance Chart

			Complies To:			Electrical Ratings:

Model	Description	UL	CAN / CSA22.2,	IEC 60601-1,		VAC		Cycles
		60601-1,			CE		Amps
			#601.1-M90	Ed. 2		+/- 10%		(Hz)
		Ed. 1

8000-001	VetPro 1000 w/ Scaler	•	•	•	•	115	6	60
8000-002	VetPro 1000 w/o Scaler	•	•	•	•	115	6	60
8000-003	VetPro 1000 w/ Scaler and Fiber	•	•	•	•	115	6	60
	Optics
8000-004	VetPro 1000 w/o Scaler and w/	•	•	•	•	115	6	60
	Fiber Optics
8000-005	VetPro 1000 w/ Scaler, Export				•	230	3	50
8000-006	VetPro 1000 w/ LED Scaler and				•	230	3	50
	Fiber Optics. Export
8000-007	VetPro 1000 w/ LED Scaler and	•	•	•	•	115	6	60
	2 Position Fiber Optics
8000-008	VetPro 1000 w/ LED Scaler and	•	•	•	•	115	6	60
	Fiber Optics
8000-006S	VetPro 1000 w/ LED Scaler and				•	230	3	50
	Swivel Fiber Optics. Export
8000-007S	VetPro 1000 w/ LED Scaler and	•	•	•	•	115	6	60
	2 Position Swivel Fiber Optics

8000-008S	VetPro 1000 w/ LED Scaler and	•	•	•	•	115	6	60
	Swivel Fiber Optics

Note

Refer to Section E For Serial Number Breaks

004-0586-00 [Revised: 11/03/15]

Scheduled Maintenance Chart

		Scheduled Maintenance

Interval	Inspection / Service	Description

Daily	Clean System	Refer to: Operating and Care Guide Tri-fold or CD, located in sleeve inside door on back of cart.

	DrainAir Regulator	Refer to: Operating and Care Guide Tri-fold or CD, located in sleeve inside door on back of cart.

	Drain Condensation from	Refer to: Operating and Care Guide Tri-fold or CD, located in sleeve inside door on back of cart.
	Air Tank
	Empty Water System	Refer to: Operating and Care Guide Tri-fold or CD, located in sleeve inside door on back of cart.

After Each Procedure	Clean Handpieces	Follow manufacturer’s of handpieces recommendations.

	Flush Handpieces	Refer to: Operating and Care Guide Tri-fold or CD, located in sleeve inside door on back of cart.

	Fill Water Bottles	Refer to: Water Bottles in this manual.

	Change Mufflers
Annually	and	Refer to: Mufflers andAir Regulator in this manual.
	Air Regulator Filter
Date of Service:		Model Number:
Location:		Serial Number:
Service Technician:		Notes:

004-0586-00 [Revised: dd/mo/yr]

Section A

Operation &

Troubleshooting

004-0586-00 [Revised: dd/mo/yr]

A-1

Compression Cycle & Air Flow

Atmospheric air is drawn in through the intake filter to the compressor head where air is compressed and exhausted. Air travels though the check valve, which prevents air flushing back into the head, then flows through the solenoid. The solenoid allows air to escape for approximately two seconds during start-up to relieve pressure from the head, then closes sending pressurized air to the storage tank. Air from the storage tank activates the pressure switch. As the storage tank fills the pressure switch opens at a preset pressure and stops the compressor.

The air regulator adjusts air from the storage tank to 65 PSI. Storage tank air also supplies the quick disconnect. Air going to the quick disconnect is not regulated and pressure is at 100 PSI. Accessories connected to the quick disconnect will need to have it’s own regulator installed if the manufacture recommends less than 100 PSI.

The regulated air (65 PSI) flows to the foot control and water bottles. When user activates the throttle valve by depressing the foot control, air is sent through the tri-block and each instrument manifold. When the instrument is removed from the holder the holder valve is activated allowing air to flow through the handpiece. There are drive air adjustment valves to adjust air pressure for the instruments.

The air/water syringe is activated by pressing on the instrument’s air and water buttons. The user can make drive air, coolant air and water flow adjustments. Air flows though the gauge to show pressure readings. Regulated air also pressurizes the water bottles. Air to the water bottles is adjusted to 40 PSI by the water pressure regulator and can be lowered by adjusting the water pressure regulator.

Water Flow

VetPro® 1000 has a self-contained water system with two, one-liter bottles. The toggle switch opens and closes the use of the bottles. When the toggle switch is set in the middle, both valves to the bottles are closed depressurizing the bottles and stopping flow. When toggle switch is flipped

toward a bottle that bottles valve opens and allows water flow to each needle valve’s instrument. The needle valve is the users way to control water flow to instruments.

VA1245

Models:	All
Serial Numbers:	all

A-2

Always verify model & serial number

Electrical Flow

• Supply line voltage is always present at the Dental Cart power cord receptacle when plugged into a wall receptacle.

When the On/Off switch is turned on, line voltage, 115 VAC, is supplied to the Terminal Block and Pressure Switch.

• 115 VAC comes from the Terminal Block and energizes the Accessory Receptacles, Timer, Motor, Fan and Transformer.

•The Timer keeps the solenoid turned off until the compressor is running at full RPM. The Solenoid is normally opened when not energized. The Solenoid allows air to escape for approximately two seconds to relieve pressure from the head, then closes sending pressurized air to the storage tank.

• The system will continue to run until the pressure inside the system reaches

100 PSI (+ / - 5 PSI) (Cut-out time)

It will turn back on at 65 PSI (+ / - 5 PSI)

(Cut-In time).

• When the Pressure Switch is at 65 PSI (+ / - 5 PSI) or below it’s

contacts are closed and the compressor is energized.

• Transformer supplies 24 VAC to Scaler (if applicable).

Models:	All	All
Serial Numbers:	TGC001000Thru TGC001254	V796868 thru V933242

A-3

Always verify model & serial number

Electrical Flow - Current Units

• Supply line voltage is always present at the Dental Cart power cord receptacle when plugged into a wall receptacle. When the On/Off switch is turned on, line voltage, 115 VAC, is supplied to the Terminal Block and Pressure Switch.

• 115 VAC comes from the Terminal Block and energizes the Timer, Motor, Fan and Transformer.

• The system will continue to run until the pressure inside the system reaches

100 PSI (+ / - 5 PSI) (Cut-out time)

It will turn back on at 65 PSI (+ / - 5 PSI)

(Cut-In time).

• When the Pressure Switch is at

65 PSI (+ / - 5 PSI) or below it’s contacts are closed and the compressor is energized.

• Transformer supplies 24 VAC to Scaler (if applicable).

Models:		Please refer to Section D



Serial Numbers:		for Wire Diagrams Listed Under Serial Numbers
Serial Numbers:

A-4

Always verify model & serial number

Troubleshooting Chart

Problem	Probable Cause	Check	Correction
Syringe has no	Empty water bottles.	Water level in bottles.	Fill water bottles.
water when button
water when button	Toggle not seated to	Check toggle location.	Push toggle completely to left or right side.
depressed.	Toggle not seated to	Check toggle location.	Push toggle completely to left or right side.
depressed.	right or left side.
	right or left side.
	Water Regulator	Check Water regulator.	Verify bottles are pressurized. Regulator should be adjusted all the way
			to the right.
	Quick disconnect.	Check water (blue)	Depress quick disconnect with a screwdriver and hold for serveral
		disconnect.	seconds. Hold rag underneath screwdriver for any water flow. If no water
			flow, change syringe check valve.
	Tubing Crimped.	Check for crimped tubing.	Replace tubing.

	Syringe.	Check Syringe tip and	Change syringe tip. Check syringe cartridge for water, repair or replace.
		cartridge.

Handpiece has no	Needle Valves closed.	Check needle valves.	Verify needle valves are open.
water flow but
water flow but	Handpieces.	Remove handpieces and verify you have water	If you have water coming from syringe, remove handpieces and recheck
syringe is still working.	Handpieces.	Remove handpieces and verify you have water
		through tubing.	water flow from tubing, if none repair or replace handpieces.
	Kinked Tubing.	Check for kinked tubing from foot control to water	Replace tubing.
		relay.

	Water Relay	Remove air tubing from foot control going to water	If air is present, repair water relay membrane or replace water relay.
		relay, depress foot control and check for air.	Refer to: Section B Water Relay.
		Remove water tubing from tri-block coming from	If water is present, repair or replace tri-block. If no water is present,
		water relay, depress foot control.	repair or replace water relay. Refer to: Section B Tri-Block or Water
			Relay.
Handpiece leaking in	Incorrect holder	Check location of handpiece.	Place handpiece in correct holder position.
holder.	location.
	Membrane	If foot control is not depressed while handpieces	Change membrane (diaphragm) in block.
	(Diaphragm)	are hanging in holders, membrane in (tri or dual)	Refer to Section B Tri-Block.
		block is leaking.
Water bottle or toggle	Check valve.	Check, check valve.	Toggle over to one side and fill water bottle. Observe other side for leak-
leaking.			ing. If it is leaking , replace check valve. Repeat for other side.
Handpiece in holder	Handpiece in wrong	Verify handpiece is in correct holder position.	Move handpiece to correct position.
and is still running	holder.
when another hand-
when another hand-	Holder switch out of	Check set screw adjustment.	Adjust set screw on holder. Refer to Section B: Handpiece Holder
piece is in use.	Holder switch out of	Check set screw adjustment.
piece is in use.	adjustment.		Adjustment.
	adjustment.		Adjustment.
	Tri-block.	Check air to tri-block supply.	Pinch tubing off with pliers, handpiece should stop, if not check pilot
			valve.
Models:
Models:	All
Serial Numbers:	all

A-5

Always verify model & serial number

Troubleshooting Chart

Problem	Probable Cause	Check	Correction
Compressor will not start.	Power cord unplugged.	Verify power cord is plugged in cart and outlet.	Plug power cord into cart and/or outlet.

	On/Off switch is off.	Check that the on/off switch is turned on.	Turn on/off switch on.

	Circuit breaker tripped.	Check to see if circuit breaker needs reset.	Reset circuit breaker.

	No power at outlet.	Check for voltage at outlet and/or move to	Reset circuit breaker. Assure outlet is on dedicated circuit
		another room.	capable of handling cart requirements.
	Loose wire connection.	Check back panel wire connections.	Reconnect wires to back panel if loose.
			Check voltage on circuit breaker, power cord bracket and
			on/off switch. Refer to: Section B Line Voltage
	Capacitor.	Check Capacitor.	Test capacitor. Replace if needed.
			Refer to Section B: Capacitor
	Pressure Switch Frozen	Check Pressure Switch.	Replace Pressure Switch. Refer to: Section B Pressure
			Switch.
	Motor/Compressor Frozen	Unplug cart. Can you manually move	If you are unable to move compressor fans, replace com-
		compressor fans?	pressor. Refer to: Section B Compressor
Compressor will not shut off or will	Air leaks in system and/or	Check for air leaks.	Refer to: Section B Checking for Air Leaks
recycle often.	foot control.
Compressor will not recycle or	Room temperature too high.	Ambient room temperature.	Move to another room. Try running unit.
stalls and or breaker tripping
stalls and or breaker tripping	Check Valve.	See if check valve is sticking.	Spray soapy water on solenoid muffler, if it bubbles while
causing air to deplete.	Check Valve.	See if check valve is sticking.	Spray soapy water on solenoid muffler, if it bubbles while
causing air to deplete.			compressor is running, replace check valve.
			compressor is running, replace check valve.
			Refer to: Section B Check Valve
	Solenoid.	Check Solenoid.	Turn off unit and drain air tank. Turn on unit and see if
			solenoid bubbles for a few seconds, if not replace sole-
			noid.
			Refer to: Section B Solenoid
Compressor makes humming noise	To much back pressure.	See if check valve is sticking.	Spray soapy water on solenoid muffler, if it bubbles while
and or smells like it is burning.			compressor is running, replace check valve.
			Refer to: Section B Check Valve
LED light not working on scaler.	LED light not installed	Check polarity.	Check polarity ( + & - ) connection of LED bulb.
(Models 8000-007, 8000-007S, 8000-	properly.		Refer to: Section B LED Scaler
008 & 8000-008S ONLY)
008 & 8000-008S ONLY)	Tubing connection bad.	Check tubing connection.	Check continuity between tubing connection and scaler
			plug. Refer to: Section B LED Scaler
	Poor contact with pins.	Clean pins.	Clean pins with alcohol and allow to dry before use.

Models:	All
Serial Numbers:	all

A-6

Always verify model & serial number

Troubleshooting Chart

Problem	Probable Cause	Check	Correction
Scaler running intermittently or low	Poor power supply	Check power supply.	Verify VetPro 1000 is plugged into wall and not loose.
power, or not vibrating for no	connection.
apparent reason.	Air pressure not set	Check air pressure.	Check air pressure. Refer to: Section B Air Regulator
	correctly.
	Not drive air.	Check drive air adjustment knob.	Verify Drive air adjustment knob is all the way open.

	Tubing.	Check tubing continuity.	Check continunity in black and orange wires of the tubing.
			Refer to: Section B Scaler Tubing
		Check HI resistance.	Check HI resistance between the black and orange tubing
			wires. Refer to: Section B Scaler Tubing
	Tip not tight enough.	Check tip.	Verify tip is tightened. Tip must be tightened for scaler
			operation to work.
	Tip is worn.	Check tip.	Tip must be within tolerance as per tip chart for scaler
			operation to work. Change tip.
	Potentiometer Harness bad	Check for proper setting. Service tip: if setting	If you have 24 V AC or 31 V DC, Check potentiometer for
	or misadjusted.	is correct move on to Ώ check.	proper resistance sweep of 4 to 4.7K Ώ when turned from
			Min to Max on Ohmmeter measuring between the white
			and brown/blue wires on molex.
			If resistance is not ok, replace potentiometer harness. If
			resistance is ok, check all wiring and pins for continuity.
			Repair any wiring that does not pass continuity check.
			If you do not have 24V AC or 31 V DC Check power sup-
			ply and air/electric switch for failure.
			Replace potentiometer harness if power supply or air-
			electric switch has failed.
	Tubing is damaged.	Check tubing.	Check continuity in black and orange wires of the tubing.
			Refer to: Section B Scaler Tubing
	Handpiece is damaged.	Swap out handpieces.	If scaler operates properly with different handpiece, old
			one is damaged.
	Transducer in scaler.	Check transducer in scaler.	Replace with a known working handpiece. If the replace-
			ment handpiece works, then the transducer is bad in
			the problem handpiece. Return handpiece to Acteon for
			service or replace with new handpiece.

Models:	All
Serial Numbers:	all

A-7

Always verify model & serial number

Testing & Repair

Section B

004-0586-00 [Revised: dd/mo/yr]

B-1

Testing & Repair

Checking for Leaks

Use Soapy Water to check for leaks...

A)Listen to foot control for air leaks.

B)Tubing inside back of cart.

C)Air regulator and “T” fittings.

D)Storage air tank and tank fittings.

E)Tri-block and instrument manifolds.

F)Air and water quick disconnects.

G)Handpiece docks.

H)Water bottles.

I)Solenoid muffler, check valve and compressor fittings.

Note: Refer to: Section C for Access Procedures

Tri-Block

& Manifolds

Handpiece

Docks

Water Bottles

Models:	All
Serial Numbers:	all

Quick Disconnects

Foot

Control

Air Tank & Fittings

Regulator & Fittings

Tubing

Solenoid & Check Valve	VA1252
Solenoid & Check Valve
Compressor Fittings

Earlier Production Model Shown

B-2

Always verify model & serial number

Testing & Repair

Water Relay - Function and Location

The water relay is located inside the delivery panel.

The water relay stops the water flow to the needle valves until the foot control (throttle valve) is pressed, then air flows to the water relay and opens the needle valves allowing water to flow to the instruments. It also supplies water directly to the syringe.

Earlier Production Model Shown

Models:	All
Serial Numbers:	all

B-3

Always verify model & serial number

Midmark VetPro1000 Mobile Service manual

Testing & Repair

	Water Relay - Testing	Step 1: Disconnect power.
	Water Relay - Testing	Remove delivery panel.
		Remove delivery panel.
		Note: Refer to Section C Access Procedures

Step 2: Disconnect orange tubing from water relay .

Depress foot control.

Foot Control

Tube

Incoming

Water

Supply

Tri-block

Manifold

Tube

Syringe

Tube

Step 3: Disconnect tubing from water relay manifold.

Depress foot control.

Models:	All
Serial Numbers:	all


Results	Status	Required Action
Results	Status	Required Action
No water when foot control not		Water flow good.
depressed.		Water flow good.
depressed.
Water when foot control is		Water flow good.
depressed.		Water flow good.
depressed.
No air flow when orange tube is		Tubing clogged or damaged. Change
disconnected.		orange tubing.
No water flow when manifold		Water relay is bad. Replace water
tubing is disconnected.		relay.

B-4

Always verify model & serial number

Testing & Repair

Tri-Block (Dual Block in Models without Scaler 8000-002 & -004)

Function and Location

The tri-block is located behind the delivery instruments.

It is a manifold that the air and water source travel through and is routed to different components in the delivery system. When the foot control is activated, air flows into the tri-block through two tubes, one for coolant air and one for drive air. Coolant air flows from the tri-block to each instrument manifold. Drive air flows though the adjustment valve on the tri-block to each instrument. The tri-block also supplies air to the air pressure gauge.

Water flows from the water relay valve through the tri-block and to each water needle valve. The tri-block has a membrane seal that provides a fluid-tight seal between the two walls. To access the membrane for repair, remove allen screws from the front of the block to separate the block. Also Refer to: Section C Access Procedures to access the block and to Section D for a tubing diagram of the tri-block. Replacement kit for the membrane is available.

Note: The air/water supply for the syringe does not flow through the tri-block.

Membrane

Models:	All
Serial Numbers:	all

B-5

Always verify model & serial number

Testing & Repair

Line Voltage Testing - 115 VAC

Components to check line voltage are listed in the chart below.

115 VAC Models Only Reference Serial Numbers Below

Meter Reading	Status	Required Action

< 115 VAC On / Off Switch		Replace On / Off Switch

< 115 VAC Pressure Switch		Replace Pressure Switch

< 115 VAC Terminal Block		Replace Terminal Block

< 115 VAC Fiber Optic		Replace Receptacle
Receptacles		Replace Receptacle
Receptacles
< 115 VAC Timer		Replace Timer

< 115 VAC Fan		Replace Fan

< 115 VAC Transformer		Replace Transformer

115 VAC = On / Off Switch		On / Off Switch OK

115 VAC = Pressure Switch		Pressure Switch OK

115 VAC = Terminal Block		Terminal Block OK

115 VAC = Fiber Optic		Accessory Receptacles OK
Receptacles		Accessory Receptacles OK
Receptacles
115 VAC = Timer		Timer OK

115 VAC = Fan		Fan OK

115 VAC = Transformer		Transformer OK

Caution

When testing components with power on use care to prevent electrical shock.

To check line voltage...

Set multi-meter to v

Use multi-meter to verify voltage.

Models:	All	All
Serial Numbers:	TGC001000Thru TGC001254	V796868 thru V933242

B-6

Always verify model & serial number

Testing & Repair

Line Voltage Testing - 230 VAC

Components to check line voltage are listed in the chart below.

230 VAC Models Only

Reference Serial Numbers Below

Meter Reading	Status	Required Action
< 230 VAC On / Off Switch		Replace On / Off Switch
< 230 VAC Pressure Switch		Replace Pressure Switch
< 230 VAC Terminal Block		Replace Terminal Block
< 230 VAC Timer		Replace Timer
< 230 VAC Fan		Replace Fan
< 230 VAC Transformer		Replace Transformer
< 230 VAC Fiber Optic Receptacle		Replace Receptacle
230 = VAC On / Off Switch		On / Off Switch OK
230 = VAC Pressure Switch		Pressure Switch OK
230 = VAC Terminal Block		Terminal Block OK
230 = VAC Timer		Timer OK
230 = VAC Fan		Fan OK
230 = VAC Transformer		Transformer OK
231 = VAC Fiber Optic Receptacle		Fiber Optic Receptacle OK

Models:	All
Serial Numbers:	V933243 thru Present

Caution

When testing components with power on use care to prevent electrical shock.

To check line voltage...

Set multi-meter to v

Use multi-meter to verify voltage.

B-7

Always verify model & serial number

Testing & Repair

Compressor Head - Function and Location

The Compressor Head is located in the lower compartment.

Atmospheric air is drawn in though the intake filter to the compressor head where air is compressed and exhausted to the storage tank. Heat is generated from the compression process. The compressor head has a fan on both ends. There is also a fan located above the compressor head to pull hot air up and out though a vent on the back middle compartment of the cart. If you are unable to manually move the fans on the compressor (when power supply is completely shut-down), the compressor head needs replaced. There is a head rebuild kit available.

Compressor Head

Earlier Production Model Shown

Models:	All
Serial Numbers:	all

Intake Filter

B-8

Always verify model & serial number

Testing & Repair

Capacitor - Function and Location

The capacitor is located in the lower compartment.

The run capacitor aids in running efficiency. It creates a phase shift to give more power to the compressor.

Capacitor

Earlier Production Model Shown

Models:	All
Serial Numbers:	all

B-9

Always verify model & serial number

Testing & Repair

Capacitor - Testing

Step 1: Disconnect power.

Access run capacitor in lower compartment.

Note: Refer to: Section C - Lower Compartment.

Step 2: Discharge capacitor by touching screwdrivers

to both contacts on the capacitor and to each other.

Step 4: Place meter probes on capacitor connectors.

Reverse the leads, this should produce the same reading.

Step 3: Set meter to Ω reading.

Meter Reading	Status	Required Action

“O” or “Open” Reading		Replace Capacitor

Start Low and Increases		Capacitor

Models:	All
Models:	All
Serial Numbers:	all
		B-10
© Midmark Corporation 2008 SF-1928	004-0586-00 [Revised: dd/mo/yr]	B-10

Always verify model & serial number

Testing & Repair

Check Valve & Solenoid - Function and Location

The check valve and solenoid are located in the lower compartment.

Compressed air travels from the compressor head though the check valve, which prevents air flushing back into the head. Then air flows though the solenoid. The solenoid allows air to escape for approximately two seconds to relieve pressure from the head then closes sending pressurized air to the storage tank.

Solenoid

Models:	All
Serial Numbers:	all

Earlier Production Model Shown

Check Valve

B-11

Always verify model & serial number

Testing & Repair

Check Valve - Clean

Step 1: Disconnect power.

Step 2: Remove check valve from compressor head and solenoid.

Step 3: Blow out valve with air.

If valve is sticking, replace.

VA1261

Models:	All
Serial Numbers:	all

B-12

Always verify model & serial number

Testing & Repair

Pressure SwitchFunction and Location

The pressure switch is located in the middle compartment accessed from the back of the cart. When the storage tank is filled to the preset pressure the pressure switch will open and stop the compressor.

Cut-In / Cut-Out time is the minimum and maximum discharge pressures at which the compressor will switch from unload to load operation (cut-in) or from load to unload (cut-out). The pressure switch controls the Cut-In and

Cut-Out times.

Pressure Switch

Models:	All
Serial Numbers:	all

B-13

Always verify model & serial number

Testing & Repair

Pressure Switch - Adjustment

Step 1: Run compressor until pressure reaches 100 PSI.

Note: Compressor should shut off close to 100 lbs.

Step 2: If compressor didn’t shut down at 100 PSI, access pressure switch and remove cover.

Note: Refer to: Section C Middle Compartment









Adjustment Screw “A”						Adjustment Screw “B”
Adjustment Screw “A”

Step 3: Make adjustment.

•Adjustment screw “A” , turn clockwise to increase both Cut-In and Cut-Out pressure.

•Differential pressure adjustment screw “B”, turn Clockwise to increase Cut-In pressure without affecting Cut-Out.

Models:	All
Serial Numbers:	all

B-14

Always verify model & serial number

Testing & Repair

Air Regulator - Function and Location

The regulator is located in the upper compartment behind the rear door.

The air regulator regulates air from the storage tank from 100 PSI to 65 PSI. The regulator should only be set for 65 PSI. There is a button on the bottom of the regulator that will drain condensation by pressing on it at the end of each work day.

Air Regulator

Earlier Production Model Shown

Models:	All
Serial Numbers:	all

B-15

Always verify model & serial number

Testing & Repair

Air RegulatorAdjustment

Equipment alert

Do not adjust regulator over 65 PSI, it will overheat the compressor. Air pressure for the piezo electric scaler should be set to 60 PSI.

To Adjust Regulator...

A)Pull adjustment knob upward to unlock.

B)Rotate adjustment knob clockwise to increase pressure, counterclockwise to decrease pressure.

C)Push adjustment knob downward to lock.

Models:	All
Serial Numbers:	all

Decrease Increase

Adjustment

Knob

Unlock

Lock

B-16

Always verify model & serial number

Testing & Repair

Air Regulator & Air Tank - Maintenance

To Drain Air Regulator...

Place a cloth under the regulator and depress the button until there is no water coming out.

Button

Present Model Shown with Yellow Tubing Earlier Models have Red Tubing

Valve

Opened

Note

User should drain regulator and air tank daily.

Models:

Serial Numbers:

To Drain Condensation from Air Tank...

A) Turn power switch off.

B) Position end of yellow tube so it drains into a container.

C) Turn drain valve slowly to open.

D) When no water is coming out, slowly close valve.

All

all

B-17

Always verify model & serial number

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