Service manual

-14-
Revision 1/F3503
6.1 FAULT DIAGNOSIS
Incorrect electrical supply
Check that the voltage across phase and
neutral (L1 and L2) terminals of terminal block
is the voltage as stated on the unit’s electrical
rating plate.
If incorrect, check electrical connection of
supply wiring and / or check electrical supply.
6.1.1 OVEN DOES NOT OPERATE / START
Power switch faulty
Check if power switch latches. If the switch
does not latch, then switch is faulty—replace.
With switch latched, check voltage across
terminal one to terminal three or four. If there
is no voltage, check for fault in wiring.
Check voltage across terminal two to terminal
three or four. If there is no voltage, then
switch is faulty—replace.
NOTE: When power switch is latched, it
should illuminate if operating
correctly.
6.1.2 FAN DOESN’T OPERATE
Fan motor faulty
Check the supply voltage across motor
terminals. If there is no voltage then check
the electrical connections of supply wiring.
If voltage is correct then check the oven fan
for free rotation. Remove any obstruction.
If fan is free to spin and the voltage supply is
correct, then the motor is faulty—replace.
6.1.3 OVEN LIGHT NOT ILLUMINATING—
DOOR OPEN
No power to light
Check the supply voltage across lamp
housing terminals at rear of oven. If the
voltage is correct, replace the bulb (if faulty).
If the bulb is OK, check lamp housing.
Replace if faulty.
If there is no voltage, open oven door and
manually depress then release door
microswitch actuator at top right of oven.
Check actuator moves freely under spring
tension of microswitch. If not, free up actuator
and adjust microswitch actuator arm as
required.
Check voltage across micro-switch terminals
to neutral.
6.1.4 OVEN LIGHT NOT ILLUMINATING—
DOOR CLOSED
Light switch faulty
Check voltage to the top terminal of the
switch. If there is no voltage, then check
wiring.
With switch depressed, check voltage at
bottom terminal. If there is no voltage, then
replace the switch.
If voltage is correct, then check wiring to light.
NOTE: Alternately, perform a continuity test
across the terminals with the light
switch depressed.
6.1.5 60 MINUTE TIMER NO TIME UP
BUZZER
Buzzer faulty
With timer in ‘zero’ position, check the buzzer
at bottom of control panel (inside) for voltage
across terminals. If voltage is correct then
buzzer is faulty—replace.
If there is no voltage, then check wiring.
Timer not switching on buzzer
With timer in zero position, check voltage to
terminal 1 and terminal 1B of timer. If there is
no voltage at terminal 1 then check wiring.
If no voltage at terminal 1B then timer is
faulty—replace.
NOTE: Buzzer and time up indicator will
continue until the timer manually switched off
(to vertical position).
Buzzer
Buzzer Terminals
Figure 6.1.1
With the door closed there should be power to
the com terminal and the n.o. terminal.
With the door open there should be power to
the com terminal and the n.c. terminal.
If not, microswitch is faulty—replace.