Sharp R-cd1800m Service Manual

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8) For the door key unit, check the open/short and/or connection of the switch unit and the harness, too.
10.If the Key unit is defective.
1) Disconnect the power supply cord, and then remove outer case and rear cover.
2) Open the door and block it open.
3) Discharge two high voltage capacitors.
4) Replace the Key unit.
5) Reconnect all leads removed from components during testing.
6) Re-install the rear cover and the outer case (cabinet).
7) Reconnect the power supply cord after the rear cover and the outer case are installed.
8) Run the oven and check all functions.
[15] O: CONTROL UNIT TEST
The following symptoms indicate a defective control unit. Before replacing the control unit, perform the Key units test (Procedure) to determine if con-
trol unit is faulty.
Connect the power supply cord. And check for followings.
1. In connection with pads.
1) When touching the pads, a certain group of pads do not produce a signal.
2) When touching the pads, no pads produce a signal.
2. In connection with display
1) At a certain digit, all or some segments do not light up.
2) At a certain digit, brightness is low.
3) Only one indicator does not light.
4) The corresponding segments of all digits do not light up; or they continue to light up.
5) Wrong figure appears.
6) A certain group of indicators do not light up.
7) The figure of all digits flicker.
3. Other possible problems caused by defective control unit.
1) Buzzer does not sound or continues to sound.
2) Cooking is not possible.
4. If the protectors F1 and/or F2 on the control unit PWB are open, the control unit is defective. To check, carry out following procedures.
i) Disconnect the power supply cord, and then remove outer case and rear cover.
ii) Open the door and block it open.
iii) Discharge two high voltage capacitors.
iv) Remove the control unit from the control panel, referring to “CONTROL PANEL ASSEMBLY AND CONTROL UNIT REMOVAL”.
v) Check the continuity of the protectors F1 and F2 on the control unit
[16] P: POWER UNIT TEST
1. Check the out put voltage of power unit at CN21 as follows.
i) Disconnect the power supply cord, and then remove outer case and rear cover.
ii) Open the door and block it open.
iii) Discharge two high voltage capacitors.
iv) Disconnect the leads to the primary of the power transformer.
v) Ensure that these leads remain isolated from other components and oven chassis by using insulation tape.
vi) Check the voltage between Pin No1 and No2 of CN21.
vii) The output voltage should be approx. 24V. 
viii) If not so, the power unit is defective.
2. Check the continuity of the fuse F1 and protector F21 on the power unit as follows.
i) Disconnect the power supply cord, and then remove outer case and rear cover.
ii) Open the door and block it open.
iii) Discharge two high voltage capacitors.
iv) Remove the power unit from the oven, referring to “POWER UNIT REMOVAL”.
v) Check the continuity of the fuse F1 and the protector F21.  
						

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vi) If they are open, the power unit is defective
[17] Q: RELAY UNIT TEST
1. Disconnect the power supply cord, and then remove outer case and rear cover.
2. Open the door and block it open.
3. Discharge two high voltage capacitors.
4. Remove the relay unit from the oven, referring to “RELAY UNIT REMOVAL”.
5. Check the continuity of the FUSE1 on the relay unit.
1) If it is open, the relay unit is defective.
6. Check the open and /or short of the transformer primary coil on the relay unit.
1) If it is open and /or short, it is defective.
7. Check the state of the relays contacts RY-1, RY-2 and RY-3 using an ohmmeter.
1) The relay contacts should be open. If not so, the relay unit is defective.
[18] R: ANTENNA SENSOR TEST
There is no test procedure for the antenna sensor.
When the error history display shows EE15, EE25 or EE35, if the antenna motors, control unit and wiring are normal, the antenna sensor may be
defective.
[19] S: MICROWAVE SENSOR TEST
There is no test procedure for the microwave sensor.
When the error history display shows EE18, EE28 or EE38, if the magnetrons, control unit and wiring are normal, the microwave sensor may be
defective. 
						

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RCD2200M

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For example: Procedure to check the total cooking number of times (example, 957700 times) and using time (example, 1260 hours) of MG 1
and set 0 hours after MG1 is replaced.
: no sound     {: 0.1 second sound       : 2.0 second sound     : (0.06 sec. ON, 0.06 sec. OFF) x 2 beeps 
 ✩: [(0.04 sec. ON, 0.04 sec. OFF) x 3] x 4 beeps    †: (0.1 sec. ON, 0.1 sec. OFF) x 10 beeps
For example: Procedure to check the total cooking number of times (example, 957700 times) and clear it and check using time (example,
1260 hours) of MG 1 and set the using time (example, 1000 hours) of MG1.
2. Error history (SF-4)
You can check the most recent 10 error histories.
For example: Procedure to check the error histories that have been memorized in memory 1, memory 2 and memory 9.
Operation Display Indicator Sound
(within 20 sec.)SELECT POWER
SET MEMORY
START
STOP/CLEAR
2
(after 1 sec.)
1
SELECT TIME
START
STOP/CLEARCHECK
CHECK .
.
.
.
SF-
SF2
9577
(total counter for serviced [x 100])
1260
0
SF-2
0
Operation Display Indicator Sound
(within 20 sec.)SELECT POWER
SET MEMORY
START
STOP/CLEAR
2
(after 1 sec.)
SELECT TIME
START
1
SELECT TIME
1,0,0,0
START
STOP/CLEARCHECK
CHECK .
.
.
.
SF-
SF2
9577
(total counter for serviced [x 100])
0
SF-2
1260
0
1000
SF-2
0
x4
Operation Display Indicator Sound
(within 20 sec.)SELECT POWER
SET MEMORY
START
STOP/CLEAR
4
1 (latest error No.)
2
(1 time previous error)
9(8 times previous error)
SELECT POWER.
.
.
.
SF-
SF-4
EE 1
EE 6
EE24
0#2#1 
						

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#1 If there is no error “0 will be displayed. 
#2 If you touch SELECT POWER, all history are cleared. 
3. Check of AC supply voltage (SF-5)
You can check the current voltage of AC supply.
For example: Procedure to check current voltage (In case of
230V)
For example: Procedure to check current voltage (In case of
208V)For example: Procedure to check current voltage (In case of 230V
+13%)
For example: Procedure to check current voltage (In case of 208V
-13%)
4. Exhaust thermistor check (SF-6)
You can check if the exhaust thermistor works correctly or not by using this function.
For example: In case the exhaust thermistor works correctly (275ml water load is necessary.), the display will show “OH” as follows.
Operation Display Indicator Sound
(within 20 sec.)SELECT POWER
SET MEMORY
START
STOP/CLEAR
5
STOP/CLEAR.
.
.
.
SF-
230U
0
Operation Display Indicator Sound
(within 20 sec.)SELECT POWER
SET MEMORY
START
STOP/CLEAR
5
STOP/CLEAR.
.
.
.
SF-
208U
0
Operation Display Indicator Sound
(within 20 sec.)SELECT POWER
SET MEMORY
START
STOP/CLEAR
5
STOP/CLEAR.
.
.
.
SF-
EE4
0
Operation Display Indicator Sound
(within 20 sec.)SELECT POWER
SET MEMORY
START
STOP/CLEAR
5
STOP/CLEAR.
.
.
.
SF-
EE5
0
Operation Display Indicator Sound
(within 20 sec.)
(within 20 sec.)plug in
SELECT POWER
SET MEMORY
START
STOP/CLEAR
6
START
(after 5 min.)
STOP/CLEAR
STOP/CLEARON
or .
.
.
.
SF-
SF-6
5.00
(count down)
OH
SF-1
0
or 
						

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For example: In case the exhaust thermistor works incorrectly (275ml water load is necessary), the display will show “no” as follows. In
that case, the exhaust thermistor should be checked or replaced.
5. Set of standard voltage (SF-7)
When the control unit or the relay unit is replaced, set the standard voltage, referring to following procedure. Because the control unit judges if the AC
supply voltage is 230V or 208V by comparing with the standard voltage. The temporary standard voltage is set when the oven is shipped from the fac-
tory. But when the control unit is replaced to new one, it does not have the standard voltage. When the relay unit is replaced to new one, set the stan-
dard voltage too. Because the signal from the relay unit to detect the AC supply voltage has error of ±5%.
The standard voltage can be set by using this function.
For example: Procedure to set the standard voltage (in case input voltage is 230V ±1V)
Image of the standard voltage is as follows; 
When the oven detects the AC supply voltage is 230V, the control unit calculates the standard voltage is 219V. Because 230V- 11v = 219V.
When the oven detects the AC voltage is 208V, the control unit calculates that the standard voltage is 219V. Because 208V + 11V = 219v.
NOTE: 11V is not exact.
For example: In case that AC supply voltage is out of range from tentative memorized voltage (standard voltage ±13%), the display will
show “----” as follows. 
At that time, the voltage of AC power may be not suitable or the control unit and /or the relay unit may be out of order.
Operation Display Indicator Sound
(within 20 sec.)
(within 20 sec.)plug in
SELECT POWER
SET MEMORY
START
STOP/CLEAR
6
START
(after 5 min.)
STOP/CLEAR
STOP/CLEARON .
.
.
.
SF-
SF-6
5.00
(count down)
no
SF-1
0
or
Operation Display Indicator Sound
(within 20 sec.)
(within 20 sec.)plug in
SELECT POWER
SET MEMORY
START
STOP/CLEAR
7
START
(after 1 sec.)
STOP/CLEAR.
.
.
.
SF-
230U
230U
SF-
0
(currnt voltage)
Flashing
Operation Display Indicator Sound
(within 20 sec.)
(within 20 sec.)plug in
SELECT POWER
SET MEMORY
START
STOP/CLEAR
7
START
STOP/CLEAR.
.
.
.
SF-
----
0 
						

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For example: Procedure to set standard voltage at 230V area. This example shows how to set the standard voltage when the oven judge
that the input voltage is 208V by mistake at 230V area.
If the input voltage is not accurate at the place of customer, the standard voltage can be selected by using “0” key in the following procedure.
For example: Procedure to set standard voltage at 208V area. This example shows how to set the standard voltage when the oven judge
that the input voltage is 230V by mistake at 208V area.
If the input voltage is not accurate at the place of customer, the standard voltage can be selected by using “0” key in the following procedure.
6. CUSTOM HELP
You can check if the correct control unit is installed or not by using this function.
Procedure to check the model name and making date of software.
#1: The display will show “cd22”, “cd18” or “cd12”. 
      “cd22” means model R-CD2200M and “cd18” means model R-CD1800M and “cd12” means model R-CD1200M.
Operation Display Indicator Sound
(within 20 sec.)
(within 20 sec.)plug in
SELECT POWER
SET MEMORY
START
STOP/CLEAR
7
0
START
(after 1 sec.)
STOP/CLEAR.
.
.
.
SF-
208U
230U
230U
SF-
0
(currnt voltage)
(select voltage)
Flashing
Operation Display Indicator Sound
(within 20 sec.)
(within 20 sec.)plug in
SELECT POWER
SET MEMORY
START
STOP/CLEAR
7
0
START
(after 1 sec.)
STOP/CLEAR.
.
.
.
SF-
230U
208U
208U
SF-
0
(currnt voltage)
(select voltage)
Flashing
Operation Display Indicator Sound
(within 20 sec.)SELECT POWER
SET MEMORY
START
STOP/CLEAR
CUSTOM HELP
STOP/CLEARplug in
.
.
.
.
SF-
cd-XX
XXXX
XXXX
0
(within 20 sec.)
#1
(model name)
(date)
(time) 
						

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[2] SERVICING FOR BRINTED WIRING BOARDS
1. Precautions for Handling Electronic Components
This unit uses CMOS LSI in the integral part of the circuits. When han-
dling these parts, the following precautions should be strictly followed.
CMOS LSI have extremely high impedance at its input and output ter-
minals. For this reason, it is easily influenced by the surrounding high
voltage power source, static electricity charge in clothes, etc. and
sometimes it is not fully protected by the built-in protection circuit.
In order to protect CMOS LSI.
1) When storing and transporting, thoroughly wrap them in aluminium
foil. Also wrap PW boards containing them in aluminium foil.
2) When soldering, ground the technician as shown in the figure and
use grounded soldering iron and work table.
2. Servicing of Printed Wiring Boards
We describe the procedures to permit servicing of the printed wiring
boards of the microwave oven and the precautions you must take
when doing so. To perform the servicing, power to the printed wiring
boards is available either from the power line of the oven itself or from
an external power source.
1.Servicing the printed wiring boards with power supply of the
oven:
CAUTION: THE HIGH VOLTAGE TRANSFORMER OF THE MICRO-
WAVE OVEN IS STILL LIVE DURING SERVICING AND
PRESENTS A HAZARD.
Therefore, before checking the performance of the printed wiring
boards,
1) Disconnect the power supply cord and then remove outer case
and rear cover.
2) Open the door and block it open.
3) Discharge two high voltage capacitors.
4) Disconnect the leads to the primary of the two power transform-
ers.
5) Ensure that these leads remain isolated from other components
and oven chassis by using insulation tape.
6) After that procedure, re-connect the power supply cord.
After checking the performance of the printed wiring boards,
1) Disconnect the power supply cord.
2) Open the door and block it open.
3) Re-connect the leads to the primary of the two power transform-
ers.
4) Re-install the rear cover and the outer case (cabinet).
5) Re-connect the power supply cord after the rear cover and the
outer case is installed.
6) Run the oven and check all functions.
a) On some models, the power supply cord between the printed
wiring boards and the oven itself is so short that the they
can’t be separated. For those models, check and repair all
the printed wiring boards (sensor-related ones included) of
the printed wiring boards while keeping it connected to the
oven.b) On some models, the power supply cord between the printed
wiring boards and the oven proper is long enough that they
may be separated from each other. For those models, it is
possible to check and repair the controls of the printed wiring
boards while keeping it apart from the oven proper; in this
case you must short both ends of the door sensing switch
(on PWB) of the printed wiring boards with a jumper, which
activates an operational state that is equivalent to the oven
door being closed. As for the sensor-related controls of the
printed wiring boards, checking them is possible if dummy
resistor(s) with resistance equal to that of the controls are
used.
2.Servicing the printed wiring boards with power supply from an
external power source:
Disconnect the printed wiring boards completely from the oven
proper, and short both ends of the door sensing switch (on PWB) of
the printed wiring boards, which activates an operational state that
is equivalent to the oven door being closed. Connect an external
power source to the power input terminal of the printed wiring
boards, then it is possible to check and repair the controls of the
printed wiring boards it is also possible to check the sensor-related
controls of the printed wiring boards by using the dummy resis-
tor(s).
3. Servicing Tools
Tools required to service the printed wiring boards assembly.
1) Soldering iron: 60W
(It is recommended to use a soldering iron with a grounding termi-
nal.)
2) Oscilloscope: Single beam, frequency range: DC - 10MHz type or
more advanced model.
3) Others: Hand tools
4. Other Precautions
1) Before turning on the power source of the printed wiring boards,
remove the aluminium foil applied for preventing static electricity.
2) Connect the connector of the key unit to the printed wiring boards
being sure that the lead wires are not twisted.
3) After aluminium foil is removed, be careful that abnormal voltage
due to static electricity etc. is not applied to the input or output ter-
minals.
4) Attach connectors, electrolytic capacitors, etc. to PWB, making
sure that all connections are tight.
5) Be sure to use specified components where high precision is
required.
approx. 1M ohm 
						

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RCD2200M

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