DOWNLOAD Sharp R-1900M Service Manual ↓ Size: 3.19 MB | Pages: 50 in PDF or view online for FREE

R1900M

6 – 7

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. 

vi) If they are open, the power unit is defective

1. CARRY OUT 3D CHECKS.

2. Remove the relay unit from the oven, referring to “RELAY UNIT REMOVAL”.

3. Check the continuity of the FUSE1 on the relay unit.

1) If it is open, the relay unit is defective.

4. 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.

5. 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.

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.

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.

R1900M

7 – 1

R1900M

Service Manual

 

This oven has the special functions for servicing as shown in the table 1 ~ 4.

By using the special function, service person can check the using time or the using number of times for the electrical parts. Also service person can
check the AC supply voltage and /or set the standard voltage.

When “SF-2” is selected, the display will show the total cooking number of times.

Table 1. Total cooking number of times

The service person can check and /or carry out the contents as shown in the table 2.

Table 2. Special function

NOTE: The function marked “yes” can be used only after the oven is plugged in again.

When the display shows “CC” and the number as shown in the table 3,

1) Before replacing the parts, check the using time or number of times about the parts.

2) If the using time or number of times go over the limit level, replace the defective parts.

3) After replacing the parts, clear the using time or number of times about the parts, referring to the table 4.

Table 3. CC error

The using time or using number of times can be checked or set by using the number pads after “SF-2” is set.

Table 4. Using time or number of times about each part

SF-2

Total cooking number of times

9999(x100) times



–

Check, clear and set of using time or number of times

2

SF-2

Error history

4

SF-4

Check of AC supply voltage

5

SF-5

Exhaust thermistor check

6

SF-6

Yes

Set standard voltage for production.

7

SF-7

Yes

Model name
Making date of software

CUSTOM HELP

cd XX (Model)
XX XX (Date)
XX XX (Time)

“CC”, “1.” repeatedly

Magnetron 1 (top)

1250 hour

Display only

“CC”, “2.” repeatedly

Magnetron 2 (bottom)

1250 hour

Display only

“CC”, “3.” repeatedly

Exhaust fan

3000 hour

Display only

“CC”, “4.” repeatedly

Need to change relay unit

MG Relay 200000 times Display only

“CC”, “1.2.4.” repeatedly

Some maintenance occurs same time
Ex. Magnetron 1&2 and relay unit

Display only

Using time of MG 1 (top)

1

9999 hours





Using time of MG 2 (bottom)

2

9999 hours





Using number of times of MG 1 (top) relay

3

999 (x 1000) times



–

Using number of times of MG 2 (bottom) relay

4

999 (x 1000) times



–

Total cooking time (hour. min.)

5

99 hours 59min.



–

Total cooking time (hundred hour)

6

9999 hundred hours



–

Using time of exhaust fan

7

9999 hours





R1900M

7 – 2

: 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

You can check the most recent 10 error histories.

#1 If there is no error “0" will be displayed. 

#2 If you touch POWER LEVEL, all history are cleared. 

(within 20 sec.)

POWER LEVEL

SET MEMORY

START

STOP/CLEAR

2

(after 1 sec.)

1

MANUAL/ REPEAT

START

STOP/CLEAR

CHECK

CHECK

.
.
.
.

SF-

SF2

9577

(total counter for serviced [x 100])

1260

0

SF-2

0

(within 20 sec.)

POWER LEVEL

SET MEMORY

START

STOP/CLEAR

2

(after 1 sec.)

MANUAL/ REPEAT

START

1

MANUAL/ REPEAT

1,0,0,0

START

STOP/CLEAR

CHECK

CHECK

.
.
.
.

SF-

SF2

9577

(total counter for serviced [x 100])

0

SF-2

1260

0

1000

SF-2

0

x4

(within 20 sec.)

POWER LEVEL

SET MEMORY

START

STOP/CLEAR

4

1 (latest error No.)

2 (1 time previous error)

9 (8 times previous error)

POWER LEVEL

.
.
.
.

SF-

SF-4

EE 1
EE 6

EE24

0

#2

#1

R1900M

7 – 3

You can check the current voltage of AC supply.

You can check if the exhaust thermistor works correctly or not by using this function.

(within 20 sec.)

POWER LEVEL

SET MEMORY

START

STOP/CLEAR

5

STOP/CLEAR

.
.
.
.

SF-

HIGH

0

(over230V)

(within 20 sec.)

POWER LEVEL

SET MEMORY

START

STOP/CLEAR

5

STOP/CLEAR

.
.
.
.

SF-

LO

0

(under 230V)

(within 20 sec.)

POWER LEVEL

SET MEMORY

START

STOP/CLEAR

5

STOP/CLEAR

.
.
.
.

SF-

EE4

0

(within 20 sec.)

POWER LEVEL

SET MEMORY

START

STOP/CLEAR

5

STOP/CLEAR

.
.
.
.

SF-

EE5

0

(within 20 sec.)

(within 20 sec.)

plug in

POWER LEVEL

SET MEMORY

START

STOP/CLEAR

6

START

(after 5 min.)

STOP/CLEAR
STOP/CLEAR

ON

or

.

.

.
.

SF-

SF-6

5.00
(count down)

OH

SF-1

0

or