Panasonic SD-253 Service Manual ▷ View online
Check point
Diagnosis
Remedy
Connection of the heater terminals
Check the connection of the heater terminals. Make a proper connection.
<Reference value>
(If no problem is found with the connection)
Replace the heater.
Resistance of the heater (in normal status)
230V: 96
Ω
-
240V: 104
Ω
-
2.1.4. Thermistor Operation Test (Perform this test after replacing the defective
thermistor.)
1. Make sure that the main body is in the main body test waiting mode. Press the "select" pad.
2. The LED is illuminated with "BAKE" and "RAPID" shown on the display.
3. Turn on the heater for 3 seconds at 32 second intervals. Set the thermistor temperature at 35°C.
4. Pressing the "Stop/Start" pad returns you to the main body test waiting mode.
Evaluation:
If the thermistor section in the main body remains at approximately 35°C, the thermistor is functioning properly.
2.1.5. Buzzer Operation Test
1. Make sure that the main body is in the main body test waiting mode. Press the "Size" pad.
2. The LED is illuminated with "RAISIN" and "DOUGH" shown on the display.
3. Repeat the ON (0.3 seconds)-OFF (0.7 seconds) procedure 8 times.
4. Pressing the "Stop/Start" pad returns you to the main body test waiting mode.
Remedy:
If the buzzer does not sound during the buzzer operation test, replace control boards A and B.
When the main body operation test is finished, press the "Stop/Start" pad.
When the main body test modes 1.1.1 ~ 1.1.5 are checked and completed successfully, the main body is not experiencing a
problem. Please check the following, as the cause may lie with the user.
problem. Please check the following, as the cause may lie with the user.
Causes and Remedies of user-side problems
Symptom
Cause
Remedy
The baked color is too dark.
The amount of sugar is excessive.
Reduce the amount of sugar.
The proper baked color is not selected.
Select the proper baking color.
The baked color is too light.
The amount of sugar is insufficient.
Add the correct amount of sugar.
The proper baked color is not selected.
Select the proper baking color.
The inner lid is dirty and darkened.
Clean the inner lid.
The height of the bread was not sufficient.
Use the correct amount of ingredients.
Bread rising is insufficient
due to a high
temperature. (no less than 30°C)
Use water at a temperature of 5°C or lower.
The bread does not rise enough.
The amount of sugar is insufficient.
Add the correct amount of sugar.
The flour was too old.
Use new flour.
The flour does not have enough protein.
Use flour that contains a lot of protein.
The amounf ot water is insufficient.
Measure the correct amount of water with a
measuring cup.
measuring cup.
The amount of yeast is insufficient.
Measure the correct amount of yeast with a
measuring spoon.
measuring spoon.
The yeast is getting less active.
Put the yeast in a sealed package and keep it in
the refrigerator.
the refrigerator.
The yeast is inactive.
Do
not
keep
the
yeast
at
a
high
room
temperature.
The yeast is placed in contact with the water.
Make sure to cover the yeast with the flour.
The room temperature is too high. (30°C or
higher)
higher)
Use water at a temperature of 5°C or lower.
Timer-cooking
is
performed
under
a
high
ambient temperature.
Chose a location with a lower temperature to
perform cooking.
perform cooking.
The amount of flour and water is inappropriate. Measure the correct amount with a measuring
cup and scale.
The amount of ingredients is incorrect.
Use the exact amount written in the operation
manual.
manual.
Baked with the "quick course".
Choose the appropriate course to bake.
The inappropriate size is set.
Make the correct setting.
9
SD-253
Symptom
Cause
Remedy
The bread rises too much.
The amount of sugar is excessive.
Reduce the amount of sugar.
The amount of yeast is excessive.
Reduce the yeast to a proper level.
A business-use flour with too much protein has
been used.
been used.
Reduce the amount of yeast.
The amount of flour and water is excessive.
Measure the correct amount with a measuring
cup.
cup.
The bread maker is used at elevations of 1.000m
or above.
or above.
Reduce the amount of yeast.
The bread does not rise high and remains
white.
white.
The kneading blades are not attached.
Attach the kneading blades.
The user forgot to add the yeast.
Be sure to place the yeast under the flour.
The amount of water is excessive.
Measure the correct amount with a measuring
cup.
cup.
The amount of flour is insufficient.
Measure the correct amount with a measuring
cup.
cup.
Put the water in first
Add the yeast, flour and water in that order.
Some flour is left inside the bread.
The amount of flour is excessive.
Measure the correct amount with a measuring
cup.
cup.
The amount of water is excessive.
Note:
Making bread is a very delicate task. Even if you follow the same procedure to bake, the rising and shape of the bread varies depending on
the room temperature, ingredients, preservatives, and the use of the timer. Temperature differences between the morning, noon, and night or
using an air conditioner greatly affects the bread.
Also, the kind of ingredients, their freshness, the amount of protein in the flour and the preservatives affect the height and rising of the bread.
Making bread is a very delicate task. Even if you follow the same procedure to bake, the rising and shape of the bread varies depending on
the room temperature, ingredients, preservatives, and the use of the timer. Temperature differences between the morning, noon, and night or
using an air conditioner greatly affects the bread.
Also, the kind of ingredients, their freshness, the amount of protein in the flour and the preservatives affect the height and rising of the bread.
·
Use the bread maker at a room temperature of no more than 30°C.
·
When the room temperature is 25°C or higher, use cool water and decrease the amount of water by 10ml. (It is better to cool the flour in
the refrigerator.)
the refrigerator.)
·
Place the yeast under the flour to prevent contact with the water.
·
Measure the correct amount with a measuring cup and a scale. Add the yeast, flour, water, and other ingredients in this order.
·
Use new ingredients (yeast, flour, sugar, etc.) and put the remaining yeast into a sealed package to be stored in a refrigerator.
* Be sure to set dry ingredients in the dispenser. (Sticky materials make the dispenser assembly dirty and can cause a malfunction of the
open/close operation.)
open/close operation.)
10
SD-253
1. Remove the dispenser cover assembly and the dispenser
assembly from the top lid.
2. Remove the hinge screw from the back of the body.
3. Lift the top lid and slide it to the left to remove it.
Fig.1
No.
Parts Name
1
Dispenser cover Ass’y
2
Dispenser Ass’y
3
Top lid
Fig.2
No.
Parts Name
1
Hinge screw
Fig.3
3 DISASSEMBLY PROCEDURE
3.1. Top lid
11
SD-253
1. Remove the two screws labeled F.
2. Remove the control panel assembly by pressing the side of
it.
Fig.4
1. Remove the connectors from the solenoid and the lead wire
A unit.
2. Hang the lead wire A unit on the heater case hangar rib.
3. Remove a screw from the P.C.B. cover and take the
P.C.board A assembly out of the control panel.
4. Remove ribs at two locations of the P.C.B. cover and take
the P.C. board A assembly out.
Fig.6
No.
Parts Name
1
Hanger rib
2
Lead wire A Unit
3
Solenoid Ass’y
4
P.C.B. cover
5
Flat cable
6
Screw
No.
Parts Name
1
Screw F
2
Control panel Ass’y
Fig.5
Fig.7
No.
Parts Name
1
P.C.B. cover
2
P.C.Board A
3
Tabs
4
Flat cable
3.2. Control panel assembly
3.3. P.C. board A assembly
12
SD-253
Click on the first or last page to see other SD-253 service manuals if exist.