Market Forge Industries ECO-TECH PLUS ETP-10G, Service Manual

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60 minutE timEr
timer contacts
Defective timer contacts will result in failure of cooker
compartment to operate.
When this occurs, remove the side panel and proceed as
follows:
1. Turn off power to the cooker at external circuit breaker
2. Disconnect all five wires from timer terminals.
3. connect an ohmmeter between terminals 1 and 3.
4. Rotate timer dial beyond the “0 - minute” point (any
setting) to obtain a reading of zero ohms on the ohm-
meter. if zero ohm reading cannot be obtained, timer
contacts are defective and the timer must be replaced.
5. move ohmmeter leads to terminals 1 and 4.
6. Rotate timer dial to “0 - minute” position (an audible
click indicates correct position). if zero ohm reading
cannot be obtained, the timer is defective and must
be replaced.
7. Remove ohmmeter and replace all five leads on timer
terminals.
timer motor
A defective timer motor will cause continuous operation in
the TimE mode, with the timer dial failing to return to the
“0 - minute” position.
To confirm timer motor condition, proceed as follows:
1. carefully check motor wire leads and tighten loose
connections
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use care while working with control panel.
terminals carry 120 volts.
2. Turn on power to the steamer.
3. Set timer dial (any setting beyond “0 - minute”). if op-
eration is correct, the motor will turn the dial toward
“0 - minute”. if the motor fails to operate, it is defective
and the entire timer must be replaced.
4. Shut off power to the cooker.
door intErlocK switch
malfunction of the cooker door interlock switch prevents
indicator lights from turning on and steam generator from
operating when the timer dial is set. if steam does not
enter the compartment and the cooking indicator light fails
to turn on with the door latch securely engaged, the fault
may be in the door interlock switch. Proceed as follows:
1. Turn off power to the cooker.
2. Disconnect wires to the door switch terminals.
3. connect an ohmmeter between the common & n.O.
(normally Open) terminals of the switch.
4. Actuate the switch by closing the cooking compart-
ment door. if a zero reading cannot be obtained, the
switch is defective and must be replaced.
5. Remove the ohmmeter and replace the leads on
switch terminals.
indicator liGhts
if the cooker compartment functions correctly, with the
single exception that the indicator light fails to light during
operation, the fault is a defective indicator light. A “burned
out” or defective light is verified by using an AC volt-meter
at the leads, with input power on the selector switch in the
correct position for that timer, the timer set, and the door
latches closed. if 120 volts is present, the fault is in the in-
dicator light and requires replacement. if 120 volts is not
present, the fault is in the wiring or control components
(selector switch, timer or door switch).
buzzEr
if the buzzer does not sound at the termination of the
operator-selected timer setting (timer dial returned to “0
- minute” position), the fault may be a defective buzzer.
Buzzer operation is verified using an AC volt-meter at
buzzer coil connections with input power on and selec-
tor switch and coinciding timer dial set at the “0 - minute”
position. if voltage is 120 volts, the fault is in the buzzer,
which must be replaced. if 120 volts is not present, the
fault is in the wiring or control components (timer or selec-
tor switch).
wirinG
Using an ohmmeter, wiring continuity between the con-
nections shown on the wiring diagram is readily verified.
This is best done in stages, removing only those wires
required for each continuity check. As each lead is re-
placed, it should be checked for evidence of corrosion,
and cleaned if necessary. All leads must be tightly at-
tached so as to provide a good electrical connection.