Panasonic SR-PE55LTQ Service Manual ▷ View online
9
6. Fault Diagnosis Methods
• When providing maintenance service, please inquire about the fault (event) carefully.
• When diagnosing the fault of a single component, be sure to remove the power plug from the socket.
• When diagnosing the fault of a single component, be sure to remove the power plug from the socket.
6.1 How to Consult the Fault Diagnosis Table
The Fault Diagnosis Table falls into 6.3: Fault Diagnosis Table—Volume 1 (Body) and 6.5: Fault Diagnosis Table—
Volume 2 (Control Panel). Based on the fault diagnosis steps, first check 6.3: Fault Diagnosis Table—Volume 1
(Body). If no applicable item is found, please go into 6.4: Simple Test for Control Panel Confi rmation. In case of
abnormity, please refer to 6.5: Fault Diagnosis Table—Volume 2 (Control Panel) for fault diagnosis.
Specifi c fault state may be exhibited on the Fault Diagnosis Table in the form of breaking points (components).
Volume 2 (Control Panel). Based on the fault diagnosis steps, first check 6.3: Fault Diagnosis Table—Volume 1
(Body). If no applicable item is found, please go into 6.4: Simple Test for Control Panel Confi rmation. In case of
abnormity, please refer to 6.5: Fault Diagnosis Table—Volume 2 (Control Panel) for fault diagnosis.
Specifi c fault state may be exhibited on the Fault Diagnosis Table in the form of breaking points (components).
6.1.1 Attentions for control panel operation
This microcomputer is provided with the MOS-type FET of CMOS Digital IC as the basic component. This type of
microcomputer may suffer insulation breakdown due to cloth and human body, etc. or electricity leakage of soldering
iron.
• Grounding via resistor of several MΩ.
• Use the soldering iron without grounding insulation fault, of which the soldering iron used for electronic component
microcomputer may suffer insulation breakdown due to cloth and human body, etc. or electricity leakage of soldering
iron.
• Grounding via resistor of several MΩ.
• Use the soldering iron without grounding insulation fault, of which the soldering iron used for electronic component
is the most suitable.
• When operating component, do not touch the pins directly, and do not place the component on live conductor.
• Do not insert components upside down on the printed circuit board.
• When checking conduction with tester, do not use a high-resistance measuring range (X10000). It is acceptable to
• Do not insert components upside down on the printed circuit board.
• When checking conduction with tester, do not use a high-resistance measuring range (X10000). It is acceptable to
apply an electric pressure exceeding the rated value.
• Welding must be done within a short period. (Within a few seconds.)
• Please remove the power plug before replacing relevant component.
• When the control panel is connected to AC 220V, touching the control panel shall exercise extreme caution to
• Please remove the power plug before replacing relevant component.
• When the control panel is connected to AC 220V, touching the control panel shall exercise extreme caution to
avoid electric shock.
6.2 Self-Diagnosis
Function
In case of abnormal mode, the LCD (components of Liquid Crystal Display) will automatically display contents as
below:
below:
6.2.1 Diagnosis contents (U code)
Indication contents
Signs • Situation
Operation methods
“No pot”
Incapable of cooking or keeping warm.
Incapable of cooking or keeping warm.
Put the pot in.
Keep Warm stops due to “excessive
keep warm duration” in the keep warm
period.
keep warm duration” in the keep warm
period.
The keep warm lasts for 24h or even
longer.
longer.
Press the “Power Off” key.
• Does the keep warm function last
• Does the keep warm function last
for 24h or longer? (The duration
of heating in keep warm mode
is no more than 24h, and the
maximum warm keeping period is
recommended not to exceed 1h.)
of heating in keep warm mode
is no more than 24h, and the
maximum warm keeping period is
recommended not to exceed 1h.)
6.2.2 Diagnosis contents (H code)
Indication contents
Signs • Situation
Operation methods
The “sensor disconnects” and receives
no key-press operation.
no key-press operation.
Replace the cooker sensor.
The “relay shows abnormity” and
receives no key-press operation.
receives no key-press operation.
Replace the control panel (power-
supply components) or the heater
(whole).
supply components) or the heater
(whole).
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6.3 Fault Diagnosis Table—Volume 1 (Body)
Note: the sign “○” indicates possible root source of the component fault.
Diagram number
1
2
3
10
12
28
29
Breaking point
Cast
heater
ass’y
Ther-
most
ass’y
Micro
switch
Power
line
Finished
outer
cover
Pan
pack-
ing
Inner
pot
Fault
state
Body
state
Not
cooking
a meal
Power on,
the LED
is lit.
○
Power on,
the LED
is not lit.
○ ○
When the thermal fuse
i n t h e b o t t o m s e n s o r
burns out, please shoot
the troubles first before
replacing other defective
parts.
i n t h e b o t t o m s e n s o r
burns out, please shoot
the troubles first before
replacing other defective
parts.
The LCD
displays
[U10]
○
Please check whether the
inner pot is put into the
cooker body.
inner pot is put into the
cooker body.
The LCD
displays
[H01]
○
The LCD
displays
[H05]
○
The food cannot be
completely cooked
due to early turn-off
completely cooked
due to early turn-off
○
The switch may disconnect
in advance while cooking
under the condition of
fl avoring settling.
in advance while cooking
under the condition of
fl avoring settling.
The steam leaks
from around the
cooker
from around the
cooker
○ ○ ○
Confirm that no foreign
material is stuck on the
inner pot, pot cover or pan
packing.
material is stuck on the
inner pot, pot cover or pan
packing.
The steam leaks
along the handle of
the outer cover
along the handle of
the outer cover
○
C o n f i r m t h a t t h e s t o p
screws on the handle of
the pot cover have been
tightened securely.
screws on the handle of
the pot cover have been
tightened securely.
High-temperature
warm keeping (over
81℃)
warm keeping (over
81℃)
○
The holding temperature
can be adjusted.
can be adjusted.
Low-temperature
warm keeping
(under 66℃)
warm keeping
(under 66℃)
○
The holding temperature
can be adjusted.
can be adjusted.
Not
keeping
warm
The
warm-
keeping
LED
indicator
light is lit
○
Bubbles appear
○ ○ ○
Generated due to power-
off or insufficient rice
stirring sometimes.
off or insufficient rice
stirring sometimes.
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6.4 Simple Test for Control Panel Confi rmation
(Before fault diagnosis, conduct the simple test for control panel confirmation as below and check whether the
control panel (whole) can run normally.) Confi rm whether the control panel suffers no fault and whether each key-
press operation is normal based on the following steps. Then judge whether the control panel (whole) can function
normally (excluding the temperature performance for cooking and thermal insulation). In case of any abnormity,
please diagnose the fault as per the Fault Diagnosis Table.
control panel (whole) can run normally.) Confi rm whether the control panel suffers no fault and whether each key-
press operation is normal based on the following steps. Then judge whether the control panel (whole) can function
normally (excluding the temperature performance for cooking and thermal insulation). In case of any abnormity,
please diagnose the fault as per the Fault Diagnosis Table.
1.
Insert the special power line of the body into the power
plug, and press three buttons, namely “Keep Warm”,
“Appointment” and “Power On”.
plug, and press three buttons, namely “Keep Warm”,
“Appointment” and “Power On”.
य़
䗝ᢽ
䗝ᢽ
㉇佁
㙝㉏
㊭㉇
剐㉏
剡剐
偼༈∸
䈚䐘ㄟ
㉹
݇
ֱ⏽
乘㑺
ᓔ
ᯊ䯈䆒ᅮ
SR-PE55
䕙ࡽ
⛍伾
⛍伾
Off
Keep Warm
Timer
Start
偼༈∸
䈚䐘ㄟ
剐㉏ 剡剐
㉹
㊭㉇
㙝㉏
㉇佁
Ԣ
Ё
催
乘㑺
⛍䇗
ߚৢ
ᇣᯊ
2.
If various segments of the LCD screen are lit as shown in
the right diagram, it indicates normal operation. (releasing
all the 3 keys can exit from the state.)
the right diagram, it indicates normal operation. (releasing
all the 3 keys can exit from the state.)
偼༈∸
䈚䐘ㄟ
剐㉏ 剡剐
㉹
㊭㉇
㙝㉏
㉇佁
Ԣ
Ё
催
乘㑺
⛍䇗
ߚৢ
ᇣᯊ
3.
If releasing all the 3 keys, the buzzer will sound once, the
LCD screen will display the situation as shown in the right
diagram, the indicator light of “Power On” will be lit and the
heater will begin to work.
LCD screen will display the situation as shown in the right
diagram, the indicator light of “Power On” will be lit and the
heater will begin to work.
The heater will become hot.
Please take care not to be
burned.
Please take care not to be
burned.
Warning
偼༈∸
䈚䐘ㄟ
㙝㉏
Ԣ
催
乘㑺
ߚৢ
4.
Operate other keys and confi rm whether they are in normal
condition, then press the “Power Off” key.
condition, then press the “Power Off” key.
य़
䗝ᢽ
䗝ᢽ
㉇佁
㙝㉏
㊭㉇
剐㉏
剡剐
偼༈∸
䈚䐘ㄟ
㉹
݇
ֱ⏽
乘㑺
ᓔ
ᯊ䯈䆒ᅮ
SR-PE55
䕙ࡽ
⛍伾
⛍伾
Off
Keep Warm
Timer
Start
偼༈∸
䈚䐘ㄟ
剐㉏ 剡剐
㉹
㊭㉇
㙝㉏
㉇佁
Ԣ
Ё
催
乘㑺
⛍䇗
ߚ
Check the above operations from 1 to 4, and if they functions normally, it can be judged that the control panel (whole)
works normally.
works normally.
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6.5 Fault Diagnosis Table—Volume 2 (Control Panel)
Note: the sign “○” indicates other components that may have faults.
Diagram number
9
Breaking point
Control
baseplate
Power
baseplate
Fault state
Body state
Not cooking
The cooking
LED indicator
light is lit
○
○
The cooking
LED indicator
light is not lit
○
○
It indicates that the
fault is caused by the
burnout of the thermal
f u s e i n t h e c o o k e r
sensor.
fault is caused by the
burnout of the thermal
f u s e i n t h e c o o k e r
sensor.
The LCD
displays [U10]
○
○
Please check whether
the inner pot is put into
the cooker body.
the inner pot is put into
the cooker body.
The LCD
displays [H01]
○
○
The LCD
displays [H05]
○
○
The food cannot be completely
cooked due to early turn-off
cooked due to early turn-off
○
○
T h e s w i t c h m a y
disconnect in advance
while cooking under
t h e c o n d i t i o n o f
fl avoring settling.
disconnect in advance
while cooking under
t h e c o n d i t i o n o f
fl avoring settling.
High-temperature warm
keeping (over 81℃)
keeping (over 81℃)
○
○
T h e h o l d i n g
temperature can be
adjusted.
temperature can be
adjusted.
Low-temperature warm
keeping (under 66℃)
keeping (under 66℃)
○
○
T h e h o l d i n g
temperature can be
adjusted.
temperature can be
adjusted.
Not keeping
warm
The warm
keeping LED
indicator light
is lit
○
○
The buzzer
does not
sound
Other
operations are
normal
○
○
The LCD displays partial
contents
contents
○
The appointment cannot be
made
made
○
The cooking
LCD indicator
light is lit
Other
operations are
normal
○
The cooking
LCD indicator
light is not lit
Other
operations are
normal
○
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