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Repair
38 312066Z
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 10. If hose current exceeds 45A, see E02:
High zone current, page 9. 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 .
e. Using a voltmeter, carefully measure the volt-
age at the hose connector. You should not get a
voltage reading. If you do, the SCR on the tem-
perature control board is bad. Replace the tem-
perature control assembly.
Replacing Temperature Control Assembly
Modules
1. Turn main power OFF . Disconnect power
supply.
2. Relieve pressure, page 23.
3. Refer to electrical diagrams; see Electrical Dia-
grams manual 312067. Temperature control assem-
bly is on left side inside cabinet.
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 Parts - Temperature Control, page 64.
7. Remove nuts and take entire temperature control
assembly to workbench.
8. Replace defective module.
9. Install assembly in reverse order.
CAUTION
Before handling assembly, put on a static conductive
wrist strap to protect against static discharge which
can damage assembly. Follow instructions provided
with wrist strap.