Graco RTX 750, TX125, RTX 900, TX 90, TX 65 Troubleshooting Manual

...

Texture Sprayers

First choice when

quality counts.

Electrical & Mechinical Troubleshooting Manual

Rev. C 10/11 /07

ti4305a

WARNING

This manual should only be used by a qualified Service Technician.

Table of Contents

Basic meter terminology and testing procedures.................................................................................................3-9

Electric Texture Sprayers

RTX 650 and TX 65:

• Motor will not start.................................................................................................................................. 10

RTX 900,1250 and TX 90,125:

• Motor will not start.................................................................................................................................. 11

RTX 750 and RTX 1000:

• Motors will not start ........................................................................................................................... 12,13

• RotoFlex Motor will not start..................................................................................................................14

• Air Compressor Motor will not start ....................................................................................................... 15

RTX 1500: Operational and troubleshooting:

• Power cord plugged in and Power Switch Off ....................................................................................... 16

• Power cord plugged in and Power Switch ON........................................................................................ 17

• Power cord plugged in and Power Switch ON and IN the PRIME MODE ............................................ 18

• Power cord plugged in and Power Switch ON and Gun Trigger Closed ................................................ 19

• Power cord plugged in and Power Switch ON and Spray Gun Trigger Open......................................... 20

Gas Texture Sprayers

TexSpray 1030 FC:

• Operational Overview ............................................................................................................................. 21

• Pump will not prime................................................................................................................................22

• Pump will not spray................................................................................................................................. 23

GM 1030 TexSpray:

• Operational and troubleshooting ............................................................................................................. 24

BASIC ELECTRICAL TERMINOLOGY

In any discussion of electricity, there are three basic terms you will need to understand.

CURRENT VOLTAGE RESISTANCE

CURRENT:

Current is the movement of the electrical charge. Current Flows through the wires from the power source to the load. Current is measured in AMPERES (AMPS, A or I). See Figure 1.

NOTE: Meter is only clamped around one wire.

ON/OFF Switch Ref

FIGURE 1

Power Plug

from Motor

VOLTAGE:

Voltage is the force that causes current to fl ow in a circuit. Voltage is measured in VOLTS (V or E). See Figure 2.

Black

ON/OFF Switch

120 AC

Power

Ref

Plug

Green

Red (+)

Black (–)

White

Black

Potentiometer

Ref 37

Black

FIGURE 2

Green

(+)

Red

Motor

Black (–)

White

BASIC ELECTRICAL TERMINOLOGY

RESISTANCE:

Resistance is anything that causes an opposition to the fl ow of current in a circuit. Resistance is used to control the amount of voltage and/or amperage in a circuit. Resistance is measured in OHMS - Ω. See Figure 3. A common component check would be motor and clutch field windings.

FIGURE 3

Known Value

��

Black Red

Yel

��

CONTINUITY TESTING

Checking “continuity” is one of the most common tests in electrical troubleshooting. Continuity is the ability of a wire or electrical component to conduct

current. When you use a continuity tester, you connect a circuit (the continuity tester) that you know works, to a wire or a component that may or may not work. Continuity testers are available at almost any hardware store.

A volt-ohmmeter or VOM can also be used to check continuity. This meter can be purchased at most electrical or electronic supply stores.

To test a component for continuity:

1 Check the tester by connecting the leads.

* If using a test light the light should turn on.

The continuity tester will tell you if the wire or component is capable of conducting current.

* If using a digital volt-ohmmete

r, the screen should show 00 if OL appears the meter needs to be repaired.

0.000

SWITCH TESTING-ROCKER

Common test procedure for a SPST Switch:

WIRE CONTINUITY TESTING

Continuity testing will “NOT” fi

120

Vac input static voltage and drops to 119Vac load voltage.

A good piece of wire will carry line and load voltage.

Damaged / Fragmented Wire

nd wire fragmentation!!

Example:

Damaged / Fragmented Wire

Pinched Wire

120 Vac input static voltage and drops to 76Vac load voltage.

Other causes:

Poor stripping of outer insulation.

Poor crimp.

A defective piece of wire may carry line voltage but will “NOT” carry load voltage

GROUND TESTING

Improper installation or alteration of grounding plug could results in risk of electric shock, fire or explosion that could cause serious injury or death. The other function of the grounding plug is to protect the control board from static build up. If the plug is missing this could cause permanent damage to the control board.

Every corded electric sprayer that comes into your shop for repair should be tested as described below, to make sure that it is properly grounded.

Pull

the machine’s plug out of the wall outlet and connect one lead from a DC continuity test light or a VOM to the (round) gro

plug.

NOTE:

If the ground terminal is broken o

Touch the test light (or VOM) leads to several bare metal surfaces on the body of the machine. If the light (or meter) indicates continuity, the machine is

properly grounded. If the light (or meter) doesn’t indicate continuity trace through the ground (green) wiring on the machine to determine where

the break is.

ff of the plug, install a new plug.

und

terminal on the

CAPACITOR TESTING:

A capacitor is an electrical component that stores electricity. Capacitors are usually used to help start a motor or make a motor run more eff

The following instructions can be used to test any capacito

WARNING!

A CAPACITOR CAN SHOCK YOU EVEN WHEN A MACHINE IS UNPLUGGED. NEVER TOUCH CAPACITOR TERMINALS WITH YOUR

FINGERS. ALWAYS USE TOOLS WITH INSULATED HANDLES. NEVER DISCHARGE A CAPACITOR NEAR FLAMMABLE

LIQUIDS OR

1 Visually inspect the capacitor for leaks, mechanically damage or loose terminals. Replace it if any of these problems exist.

2 Unplug the machine and remove the capacitor(s). If capacitor(s) are attached to the control board the test can not be perormed.

3 “SEE ABOVE WARNING” Using a screwdriver with

insulated handles, hold so that the blade contacts the capacitor terminals as shown in Fig. “discharge” the capacito

4 Put a volt-Ohm meter on the R X 100 scale.

5 While watching the meter, connect the 2 leads to the 2 terminals on the capacitor.

If the capacitor is good, the meter needle will go to the right (toward 0 resistance) (Fig. 1), then to the left (toward - maximum resistance)

VAPORS.

A. This will

FIG. A

Capacitor

If the meter needle goes all the way to the right and stays there, the capacitor is defective.(Fig.2)

If the meter needle stays all the way to the left (doesn't move at all when connected to the capacitor), the capacitor is defective.(Fig. 3)

GOOD BAD BAD

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