Thetford NR740 Manual do Utilizador descarregar pdf (Página 3)

Refrigerator Service Manual

DC0040(K), DC0051(K), DE0040, DE0051, DE0240T, DE0251T,

DC0740(X), DE0740(X), DC0751(X), DE0751(X) Models

Troubleshooting - Procedure A

Thermostat “ON” Compressor Does Not Run

Measure Terminal

Voltage Of Temperature

Control Between TP1 &

TP2. (See Figure 1)

DC 0V

DC 5V

DC 2V

Short Circuit

Normal

DC Power

Supply Failure

Change DC

Power Supply

Change DC

Power Supply

See

Procedure B

Measure Terminal

Voltage of Temperature

Control Between TP2 &

TP3. (See Figure 1)

Is Temperature

Control LED on?

YES

Correct

Voltage

Check Supply

Voltage

(10.5 – 32V DC)

(85 – 132V AC)

CORRECT

INCORRECT

Compressor

Runs

YES

Replace

10A Fuse

(See Figure 2)

Reverse Polarity

& Check Operation

(Red + / Black -)

Replace

10A Fuse

(See Figure 2)

Check DC

Polarity

INCORRECT

Compressor

Runs

YES

Check Both

DC Fuses

BLOWN

Compressor

Runs

YES

DC 0V

DC 12

to 32V

DC Power

Supply Failure

Normal

Change DC

Power Supply

See

Procedure B

Note: Measurements taken with 12.8V DC or 120V AC power supply.

Check AC

Power Supply

(37 – 45V DC)

(See Figure 5)

Change AC

Power Supply

Short Circuit

Change DC

Power Supply

GOOD

BAD

OPERATION

Power

Source

Check AC

Power Supply

(37 – 45V DC)

(See Figure 5)

DC Power

Supply Failure

Change DC

Power Supply

Change AC

Power Supply

GOOD

BAD

OPERATION

ART01945

ART01944

Brown

Red

Black

Figure 1. Temperature Control

ART01946

Figure 2. Fuse Locations

NOTE: If 10 Amp fuse is blown, check the vehicle's wiring.

Compressor Doesn't Run with Thermostat "On"

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