Sharp R-1750 Service Manual download pdf (Page 37)

R-1750

R-1751

R-1752

R-1754

1. Disconnect the power supply cord and remove the oven

from wall and remove outer case. (Refer to procedure of

"Removal of Oven from Wall" and "Outer case Removal")

2. Open the door and block it open.

3. To discharge high voltage capacitor, wait for 60 seconds.

4. Disconnect the 6-pin connector of the hood fan motor

from the main wire harness located at the right edge of

the hood duct and release the snap band from the hood

duct.

5. Remove the hood fan motor from the hood duct by lifting

it up.

6. Now, the hood fan motor is free.

7. Remove one (1) screw holding the hood duct to the oven

cavity front plate.

8. Release the 6-pin connector and the 3-pin connector of

the main harness A from the hood duct.

9. Disconnect the wire leads from the fan motor and chassis

support, and release the wire leads from holes of the

hood duct.

10.Remove the two (2) unit mounting screws from the

chassis support (right side) and the hood duct (left side).

11.Remove the one (1) screw holding the chassis support.

12.Remove the chassis support.

13.Remove the hood duct from the oven cavity by lifting it up

14.Screw the oven lamp off from the lamp socket.

15.Remove the lamp socket from the lamp angle.

16.Pull the wire leads from the oven lamp socket by pushing

the terminal hole of the oven lamp socket with the small

flat type screw driver.

17.Now, the oven lamp socket and the hood duct are free.

1. Disconnect the power supply cord , remove the oven

from wall and remove outer case (Refer to procedure of

"Removal of Oven from Wall" and "Outer case Removal".)

2. Open the door and block it open.

3. To discharge high voltage capacitor, wait for 60 seconds.

4. Disconnect the wire leads from the fan motor and the

chassis support, and release them from the holes of

hood duct.

5. Remove the one (1) screw holding the hood duct to the

oven cavity front plate, and lift up the fan motor side of the

hood duct.

6. Disconnect the high voltage wire assembly from the

magnetron.

MAGNETRON REMOVAL

7. Remove the inverter unit from the right base plate,

referring to "INVERTER UNIT REMOVAL".

8. Carefully remove four (4) mounting screws holding the

magnetron to waveguide. When removing the screws

hold the magnetron to prevent it from falling.

9. Remove the magnetron from the unit with care so the

magnetron tube should not be hit by any metal object

around the tube.

10.Remove the one (1) screw holding the magnetron air

guide to the magnetron.

11.Remove the magnetron air guide

CAUTION: WHEN REPLACING THE MAGNETRON, BE

SURE THE R.F. GASKET IS IN PLACE AND

MOUNTING SCREWS ARE TIGHTENED SE-

CURELY.

1. Disconnect the power supply cord and remove the oven

from wall and remove outer case. (Refer to procedure of

"Removal of Oven from Wall" and "Outer case Removal")

2. Open the door and block it open.

3. To discharge high voltage capacitor, wait for 60 seconds.

4. Remove two (2) unit mounting screws.

5. Remove the hood duct. (Refer to the procedure of "

THERMAL CUT-OUT (OVEN) REMOVAL

Oven lamp

socket

Terminal

Wire lead

Terminal hole

Flat type small

screw driver

HOOD FAN MOTOR, HOOD DUCT AND OVEN LAMP

SOCKET REMOVAL".

6. Straighten the tab holding the thermal cut-out to the top

plate of the oven cavity.

7 . Release the thermal cut-out (oven) from the one slit of

the oven cavity top plate.

HOOD FAN MOTOR, HOOD DUCT AND OVEN LAMP SOCKET REMOVAL

NOTE: The high voltage wire assembly should be routed

under the bar of thr high voltage transformer.

[HOW TO REMOVE TRANSISTOR Q1]

1. After the inverter unit is removed. take off the solder on

legs of transistor Q1, bridge diode D1 and PTC thermistor

PH1.

2. Remove the two (2) screws holding the heat sink to the

inverter unit board.

3. Remove the one (1) screw holding transistor Q1to the

heat sink.

4. Now, transistor Q1 is free

NOTE: Apply silicone grease (Toshiba YG6260 or Shinetsu

G-746) to the back side of transistor Q1, before

trnasistor Q1 is installed to the heat sink.

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Sharp R-1750 Service Manual Page 37

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