Sharp R-1750 Service Manual download pdf (Page 23)

R-1750

R-1751

R-1752

R-1754

TEST PROCEDURES

PROCEDURE

LETTER

COMPONENT TEST

H HOOD THERMAL CUT-OUT TEST

1. Disconnect the power supply cord, and then remove outer case.

2. Open the door and block it open.

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

4. A continuity check across the thermal cut-out terminals should indicate an open circuit unless the

temperature of the thermal cut-out reaches approximately 140˚F(60˚C) or more. At that temperature,

the contacts will close. The thermal cut-out opens automatically at approximately 113˚F(45˚C).

5. Reconnect all leads removed from components during testing.

6. Reinstall the outer case (cabinet).

7. Reconnect the power supply cord after the outer case is installed.

8. Run the oven and check all functions.

I HOOD FAN MOTOR TEST

1. Disconnect the power supply cord, and then remove outer case.

2. Open the door and block it open.

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

4. If the motor does not turn, touch the Fan Options pad once (set hood fan motor power "HIGH") and

check voltage between pins "1" and "2" (Blue and Black wires) of the 6 pin connector. If 120 Volts

appear and the hood capacitor is good, replace the hood fan assembly. If 120 Volts does not appear,

check the motor circuit. The resistance values of motor terminals are as follows:

5. Reconnect all leads removed from components during testing.

6. Reinstall the outer case (cabinet).

7. Reconnect the power supply cord after the outer case is installed.

8. Run the oven and check all functions.

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

4. If the monitor fuse is blown when the door is opened, check the primary interlock switch, secondary

interlock switch and monitor switch according to the "TEST PROCEDURE" for those switches before

replacing the blown monitor fuse.

CAUTION: BEFORE REPLACING A BLOWN MONITOR FUSE, TEST THE PRIMARY INTERLOCK

SWITCH, SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH FOR PROPER

OPERATION.

If the monitor fuse is blown by improper switch operation, the monitor fuse and monitor switch must

be replaced with "monitor fuse and monitor switch assembly" part number FFS-BA016/KIT, even if

the monitor switch operates normally. The monitor fuse and monitor switch assembly is comprised

of a 20 ampere fuse and switch.

5. Reconnect all leads removed from components during testing.

6. Re-install the outer case (cabinet).

7. Reconnect the power supply cord after the outer case is installed.

8. Run the oven and check all functions.

Resistance between;

BLU (1) AND YLW (4) = 0Ω (Shorted)

BLK (2) AND YLW (4) = 32Ω

BLU (1) AND BLK (2) = 32Ω

BLK (2) AND WHT (3) = 20Ω

WHT (3) AND RED (5) = 45Ω

6-PIN CONNECTOR

OF HOOD FAN MOTOR

32 Ω

20 Ω45 Ω

HOOD FAN

CAPACITOR

YLW

RED

BLU

BLK

WHT

123

BLU BLK WHT

YLW RED

1 2 ... 18 19 20 21 22 23 24 25 26 27 28 ... 51 52

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Sharp R-1750 Service Manual Page 23

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