Menumaster DECS11MA, Service Manual

Page: 29 / 44

5-13
CONDITION CHECK RESULT CAUSE REMEDY
1. Fuse blows. Continuity.
No continuity.
Continuity.
Shorted contact at
the primary switch.
Replace fuse,
primary, monitor,
secondary
switches, and
RELAY(RY3 )
of P.C.B Assembly.
No continuity.
Malfunction of the
monitor switch. Replace fuse,
primary, monitor,
secondary
switches, and
RELAY(RY3)
Check continuity
of monitor
switch (with
door closed).
Check continuity
of primary
switch (with
door opened).
Replace fuse
Continuity.
Malfunction of
secondary switch.
Replace fuse,
primary, monitor,
secondary
switches, and
RELAY(RY3)
of P.C.B Assembly.
No continuity.
Check continuity
of secondary
switch (with
door opened).
2. Fuse does not
blow.
No continuity.
Continuity.
No continuity.
Defective power
supply cord. Replace power
supply cord.
Defective
thermostat. Replace
thermostat. Check continuity
of thermostat.
Check continuity
of power supply
cord.
(TROUBLE 2) Oven does not operate at all, Display window does not display any figures,
and no input is accepted.
NOTE : All these switches must be replaced at the same time. Refer to page 5-7, 5-8
Normal.
Normal.
Abnormal.
Defective high
voltage capacitor. Replace high
voltage capacitor.
Set is good condition
(defective fuse only)
Fuse blows again
Defective high volt-
age transformer. Replace high volt-
age transformer. Disconnect one
side of the wire
lead connected
from transformer
to the high voltage
capacitor and
operate the unit.
Measure to
resistance high
voltage capacitor
(refer to page 5-9)
1. Fuse blows. Continuity.
No continuity.
Continuity.
Shorted contact at
the primary switch.
Replace fuse,
primary, monitor,
secondary
switches, and
No continuity.
Malfunction of the
monitor switch. Replace fuse,
primary, monitor,
secondary
switches, and
Check continuity
of monitor
switch (with
door closed).
Check continuity
of primary
switch (with
door opened).
Replace fuse
Continuity.
Malfunction of
secondary switch.
Replace fuse,
primary, monitor,
secondary
switches, and
No continuity.
Check continuity
of secondary
switch (with
door opened).
2. Fuse does not
blow.
No continuity.
Continuity.
No continuity.
Defective power
supply cord. Replace power
supply cord.
Defective
thermostat. Replace
thermostat. Check continuity
of thermostat.
Check continuity
of power supply
cord.
Oven does not operate at all, Display window does not display any figures,
and no input is accepted.
Normal.
Normal.
Abnormal.
Defective high
voltage capacitor. Replace high
voltage capacitor.
Set is good condition
(defective fuse only)
Fuse blows again
Defective high volt-
age transformer. Replace high volt-
age transformer. Disconnect one
side of the wire
lead connected
from transformer
to the high voltage
capacitor and
operate the unit.
Measure to
resistance high
voltage capacitor
(refer to page 5-9)
1. Fuse blows. Continuity.
No continuity.
Continuity.
Shorted contact at
the primary switch.
Replace fuse,
primary, monitor,
secondary
switches, and
No continuity.
Malfunction of the
monitor switch. Replace fuse,
primary, monitor,
secondary
switches, and
Check continuity
of monitor
switch (with
door closed).
Check continuity
of primary
switch (with
door opened).
Replace fuse
Continuity.
Malfunction of
secondary switch.
Replace fuse,
primary, monitor,
secondary
switches, and
No continuity.
Check continuity
of secondary
switch (with
door opened).
2. Fuse does not
blow.
No continuity.
Continuity.
No continuity.
Defective power
supply cord. Replace power
supply cord.
Defective
thermostat. Replace
thermostat. Check continuity
of thermostat.
Check continuity
of power supply
cord.
Normal.
Normal.
Abnormal.
Defective high
voltage capacitor. Replace high
voltage capacitor.
Set is good condition
(defective fuse only)
Fuse blows again
Defective high volt-
age transformer. Replace high volt-
age transformer. Disconnect one
side of the wire
lead connected
from transformer
to the high voltage
capacitor and
operate the unit.
Measure to
resistance high
voltage capacitor
(refer to page 5-9)
1. Fuse blows. Continuity.
No continuity.
Continuity.
Shorted contact at
the primary switch.
Replace fuse,
primary, monitor,
secondary
switches, and
No continuity.
Malfunction of the
monitor switch. Replace fuse,
primary, monitor,
secondary
switches, and
of P.C.B Assembly.
Check continuity
of monitor
switch (with
door closed).
Check continuity
of primary
switch (with
door opened).
Replace fuse
Continuity.
Malfunction of
secondary switch.
Replace fuse,
primary, monitor,
secondary
switches, and
No continuity.
Check continuity
of secondary
switch (with
door opened).
2. Fuse does not
blow.
No continuity.
Continuity.
No continuity.
Defective power
supply cord. Replace power
supply cord.
Defective
thermostat. Replace
thermostat. Check continuity
of thermostat.
Check continuity
of power supply
cord.
Normal.
Normal.
Abnormal.
Defective high
voltage capacitor. Replace high
voltage capacitor.
Set is good condition
(defective fuse only)
Fuse blows again
Defective high volt-
age transformer. Replace high volt-
age transformer. Disconnect one
side of the wire
lead connected
from transformer
to the high voltage
capacitor and
operate the unit.
Measure to
resistance high
voltage capacitor
(refer to page 5-9)