Service Manual 547226: OB30
December 2012
31
5.
Fault Diagnostics
5.1
SYMPTOM: Oven electrical components are unresponsive
POSSIBLE CAUSES:
Clock not set after powering up
Blown fuse
Faulty supply wiring or connections
Faulty power transformer
Tripped microtemp limiter
Faulty power module
DIAGNOSIS:
If the clock colon: is flashing, push the clock button to set the time.
Check the circuit breaker or fuse at the switchboard.
Test for the correct supply voltage at the mains terminal block.
120 volts.
Check the power transformer by testing for 12
VAC
on the 2-way connector into the
power module (refer to Technical Overview Section 2.25). Replace if there is no
12
VAC
.
Check for a tripped microtemp limiter and replace if tripped. Check the other thermal
limiters and trace the likely cause for tripping. (refer to Section 5.24)
Check for a blown power module fuse by testing for 12
VDC
between pins 1 and 6 of
the 12-way clock connector on the power module. (refer to Technical Overview
Section 2.25)
If there is no 12
VAC
then the fuse has blown. Replace the power module. (refer to
Servicing Instructions Section 7.9)
Tracing the cause of a blown power module fuse:
Check the resistance to earth of the lamp wiring and replace if there is a short circuit.
(refer to Servicing Instructions Section 7.14)
Check the power transformer by testing for 12
VAC
on the 2-way connector into the
power module. Replace the transformer if the voltage exceeds 12
VAC
.
Summary of Contents for OB30DDEPX1
Page 2: ......
Page 45: ...Service Manual 547226 OB30 December 2012 45 6 2 Single Oven Wiring Schematic ...
Page 47: ...Service Manual 547226 OB30 December 2012 47 Neutral Circuit ...
Page 48: ...Service Manual 547226 OB30 December 2012 48 Generic High Voltage Circuit ...
Page 49: ...Service Manual 547226 OB30 December 2012 49 Generic Low Voltage Lock Circuit ...
Page 50: ...Service Manual 547226 OB30 December 2012 50 Lighting and Earth Circuit ...
Page 52: ...Service Manual 547226 OB30 December 2012 52 Neutral Circuit ...
Page 53: ...Service Manual 547226 OB30 December 2012 53 Generic High Voltage Circuit ...
Page 54: ...Service Manual 547226 OB30 December 2012 54 Generic Low Voltage Lock Circuit ...
Page 55: ...Service Manual 547226 OB30 December 2012 55 Lighting Earth Circuit ...
Page 74: ...Service Manual 547226 OB30 December 2012 74 8 N O T E S ...