Thermal Dynamics DRAG-GUN 38, Instruction Manual

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Manual 0-2729 33 SECTION 5: SERVICE
E. Checking Resistor R3 (11k ohms)
1. Remove the side Panel Cover of Power Supply per
subsection 5.11-D.
2. Using a pair of needle nose pliers, remove the red
wire from the terminal on Resistor R3.
A-02128
Resistor R3
Figure 5-12 Resistor R3 Location
3. Using an ohmmeter set on the Rx100 scale make the
following check:
a. Measure the Resistance of the Resistor R3. The
meter should indicate 11K ohms.
4. Reinstall the wire back onto the Resistor terminal.
5. Check that the other ends of both red and blue wires
are properly attached.
F. Checking Compressor
1. Remove the top Panel cover from Power Supply per
subsection 5.11-E.
2. Check Compressor for Blockage.
a. Check to see if Compressor is humming. If Com-
pressor is humming, the air flow may be blocked.
Remove the Compressor's inlet filter and output
hose. Remove the blockage (clogged filter, torch
leads, torch head, clogged torch tip, etc.) .
3. Check Starting Capacitor
a. Test for 230 or 208VAC (during the 4 seconds
after power on) between wires #19 and #23 (on
TB1).
If power is present and Compressor is hum-
ming, check Starting Capacitor C1.
NOTE
Capacitors can be fail shorted, open or reduced in
capacitance.
A short may be detected with an ohmeter. Remove
leads from one of the Capacitor's terminals then
measure across the terminals. If it reads a low
resistance(less than a few thousand ohms) then it is
shorted and should be replaced.
To check for an open or reduced capacitance requires
a capacitance meter. If one is not available, try sub-
stituting a good Capacitor. If the motor starts using
the good Capacitor, the original Capacitor was
faulty.
4. Check Compressor for Overheating
a. If the unit has just been operated for an extended
time, the Compressor may be overheated. Wait
for it to cool. If it is not overheated, the Compres-
sor is defective.
5. Check Compressor for Voltage
a. Test for 208 or 230VAC (during the 4 seconds
after power on) between wires #19 and #23 (on
TB1).
If voltage is not present, check for 24 VAC on
K3's coil (from J2-3 & 4 on the main P CB). The
K3 Relay controls the 220V to the Compressor.
If 24 VAC is present, K3 is defective.
If the 24 VAC is not present, check that J2 con-
nector is plugged into the main PC Board. If J2
is connected properly, the main PCB is defec-
tive - return the unit for service.
5.10 Torch and Leads
Troubleshooting
WARNINGS
Disconnect primary power to the system before dis-
assembling the torch or torch leads.
DO NOT touch any internal torch parts while the
AC indicator light on the front panel of the Power
Supply is ON.