SM-30
Jade Range LLC
– A Middleby Company
Titan
TM
Series Heavy Duty Range
Model Series JTRH, JMRH & JTRHE
REVIEW COPY
7
4. Remove the oven control panel insert (see
OVEN CONTROL PANEL under COVERS
AND PANELS).
Check for 120 VAC supply to the Power ON/OFF
switch.
If no power is present at the FAN switch, refer
to schematic and troubleshoot the cause. Check
for loose, burned or disconnected wires or
connectors at every point in the power supply
circuit (see schematic).
If there is power to the FAN switch:
A. Toggle Power ON/OFF switch to the ON position.
There should be 120 VAC on both terminals of
the switch. If not, replace the switch according to
FAN MOTOR SWITCHES AND INDICATOR
LIGHT in the REMOVAL AND REPLACEMENT
OF PARTS section and retest.
B. With the Power ON/OFF switch in the ON
position, check the center terminal of the Blower
switch. There should be 120 volts on this terminal.
If 120 volts is indicated at the center terminal,
toggle the switch and check for 120 volts in both
the ON and the AUTO positions. If either terminal
fails to indicate 120 volts, replace the switch
according to FAN MOTOR SWITCHES AND
INDICATOR LIGHT in the REMOVAL AND
REPLACEMENT OF PARTS section and retest.
C. If there is, test the door switch under DOOR
SWITCH TEST.
If the door switch is good, remove the junction box
cover located on the motor.
If there is burned insulation on the wires, replace
the motor according to OVEN CONVECTION
MOTOR under the REMOVAL AND
REPLACEMENT OF PARTS procedures.
If wiring looks OK, check for 120 VAC. If no power,
there is an open circuit between the motor and
switch. Refer to schematic and troubleshoot the
cause.
If wiring looks OK and there is power, make sure
the neutral side of the circuit is complete.
If wiring looks OK and all circuits are good, remove
and replace the motor according to MOTOR under
the REMOVAL AND REPLACEMENT OF PARTS
procedures.
Motor Works –
Noisy or Does Not Sound Right
1. Manually spin the fan to check for bearing
noise, excessive shaft play, loose fan or duct
parts, etc. If bearing noise or shaft play, remove
and replace the motor. Repair any loose fan or
ducting parts.
2. If the motor comes on but runs noisily, check
for bearing noise, excessive shaft play, loose
fan or duct parts, etc. If bearing noise or shaft
play is found, remove and replace the motor
according to MOTOR under the REMOVAL
AND REPLACEMENT OF PARTS procedures.
3. Repair any loose fan or ducting parts.
BURNER INSPECTION
AND REPAIR
To inspect the top section or oven burners:
1. Check that all burner ports are clean. If not
clean, clean the burners according to
instructions in the Installation and Operation
Manual.
2. Check that burners burn sharp, clean and
blue, not yellow. Propane (LP) may normally
have a small yellow tip.
3. If the flame is not correct and the burners are
clean, check the air shutters according to AIR
SHUTTER ADJUSTMENT.
Nozzle and Orifice Check
If burner operation seems poor and other systems
have been checked, remove the burner nozzle
and check the orifice for blockage or damage, and
replace as necessary. Refer to TOP SECTION
BURNER AND NOZZLE or OVEN BURNER
NOZZLE in the REMOVAL AND REPLACEMENT
OF PARTS section.
Figure 37: Burner Orifice (Oven Shown)
A. Burner Orifice
