Service manual

48
(TROUBLE 3) Oven does not operate at all; Display window does not display any figures and any inputs can not
be accepted.
Condition
20A fuse
blows
Check Result Casue Remedy
Replace Primary
Interlock Switch
and Monitor
Interlock Switch.
Check continuity
Interlock Monitor
switch with door
closed.
Continuity Malfunction of
Interlock monitor
switch
Replace Primary
Interlock Switch
and Monitor
Interlock Switch.
Check continuity
of both Primary
Interlock Switch
contact with door
partially open
until interlock
monitor, switch
contact close.
Continuity Shorted contacts
of primary
interlock switch.
Approx.
90-110Ω
(normal)
ReplaceCheck continuity
of primary
winding of low
voltage
transformer.
0 Ω or
infinite
Defective low
voltage
transformer
Replace Disconnect one
side of the lead
wire connected
from transformer
to the high volt-
age capacitor and
operate the unit
0 Ω or
infinite
Defective high
voltage transformer
Replace 20A fuse
again blows
Defective high
voltage capacitor
NOTE1 : All these switches must be replaced at the same time, please refer to page 34 and 35 for adjustment
instructions.
No
Continuity
(Replace 20A fuse)
NOTE 1
NOTE 1