Thermal Dynamics DRAG-GUN 38, Instruction Manual

Page: 38 / 60

SECTION 5: SERVICE 32 Manual 0-2729
C. Checking Capacitor PC Board
1. Remove the top Panel Cover of the Power Supply
per subsection 5.11-E.
A-02127
Capacitor
PC Board
Figure 5-10 Capacitor PC Board Location
2. Using an ohmmeter set on the Rx1 scale make the
following check:
a. Measure from Capacitor PC Board (+) to (-) (see
Figure 5-9) terminals. The meter should increase
in resistance as the capacitors charge. Reverse
probes and test again. Resistance should de-
crease and then increase as the capacitor dis-
charges and charges. If meter shows short, open
or does not change, replace Capacitor PC Board.
D. Checking Pilot Return
1. Remove the right SidePanel of the Power Supply per
subsection 5.11-D.
2. Using a pair of needle nose pliers remove the red
Pilot Return Lead wire from terminal E14 on the
Main PC Board.
A-02123
Pilot Return
Lead
Figure 5-11 Pilot Return Lead Location
3. Using an ohmmeter set on the Rx1 scale make the
following checks:
a. Measure from the Torch Block and the end of the
Pilot Return wire. The meter should indicate
an open.
b. Measure from Pilot Return wire to torch tip.
Should measure short (less than 1 ohm).
4. Reinstall the wire back onto the E14 terminal.