Thermal Dynamics CUTMASTER 81, Service Manual

Page: 28 / 88

TROUBLESHOOTING 4-8 Manual 0-2957
F. RUN / RAPID AUTO RESTART /SET switch in
RUN or RAPID AUTO RESTART position; AC
indicator ON; TEMP , GAS , and DC
indicators OFF
A
Ar
t # A-03
9
86
1. Gas pressure too low
a. Set operating pressure per pressure setting la-
bel on power supply.
2. Faulty Components in Unit
Measure for 12 vdc from wire #10 to wire #11 at the
Gas Pressure Switch, located on the right side of
the unit.
a. If 12 vdc is present and pressure is above 50 psi
(3.4 bar), replace Gas Pressure Switch/Solenoid
Assembly. Refer to Section 5.08-A.
b. If pressure is above 50 psi (3.4 bar) and 12 vdc is
not present, replace the Logic PC Board.
c. Remove one wire from the pressure switch.
Check for ± 0 vdc at Main PC Board pin J24-3 to
J24-4 from the Logic PC Board. Refer to Main
PC Board Layout.
• If less than a volt, replace Logic PC Board.
Logic Board Layout
TP9
TP10
TP11
TP3
TP7 TP8 TP5
TP1
TP2
TP4
D13
TP6
Art # A-03654
D25
D33
P1-7
P1-9