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Repair
312063Z
35
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
ambient 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
,
page 9. If hose current exceeds 45A, see
, 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
ambient hose temperature.
d. Turn on
heat zone by pressing
.
e. 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 board is bad. Replace the
temperature control assembly.
Replacing Temperature Control Assembly
Modules
1. Turn main power OFF
. Disconnect power
supply.
3. Refer to electrical diagrams; see Electrical
Diagrams manual. Temperature control assembly 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
assembly. See
, page
64.
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 a static
conductive wrist strap to protect against static
discharge which can damage assembly. Follow
instructions provided with wrist strap.