Repair
28 3A1570L
Test SCR Circuit
1. Test the SCR circuit in the on position:
a. Make sure everything is connected, including
the hose.
b. Turn main power ON .
c. Adjust the hose heat setpoint above the ambi-
ent hose temperature.
d. Turn on heat zone by pressing .
e. Hold down to view electrical current.
Hose current should ramp up to 45A. If there is
no hose current, see E03: No zone current,
page 12. If hose current exceeds 45A, see E02:
High zone current, page 12. If hose current
stays several amps below 45A, hose is too long
or voltage is too low.
2. Test the SCR circuit in the off position:
a. Make sure everything is connected, including
the hose.
b. Turn main power ON .
c. Adjust the hose heat setpoint below the ambi-
ent hose temperature.
d. Turn on heat zone by pressing .
Using a voltmeter, carefully measure the voltage at the
hose connector. You should not get a voltage reading. If
you do, the SCR on the temperature control module is
bad. Replace the temperature control assembly.
Replacing Temperature Control Assembly
Modules
1. Turn main power off . Disconnect power
supply.
2. Relieve pressure, page 14.
3. Refer to electrical diagrams. See Reactor
A-25/A-XP1 Wiring Schematic, page 52. Tem-
perature control assembly is on left side inside cabi-
net.
4. Remove bolts that secure transformer assembly
and slide assembly to side in cabinet.
5. Put on static conductive wrist strap.
6. Disconnect all cables and connectors from assem-
bly. See Temperature Control Module, page 27.
7. Remove nuts and take entire temperature control
assembly to workbench.
8. Replace defective module.
9. Install assembly in reverse order.
NOTICE
Before handling assembly, put on static conductive
wrist strap to protect against static discharge which
can damage assembly. Follow instructions provided
with wrist strap.
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