Sharp R-323T Dokumentacja Pobierz pdf (Strona 10)

Ground Fault Tes

t: With the Selector switch

still in the AC position and the AC Supply cord

disconnected, use an Ohmmeter (set on highest

scale) to measure resistance between the HOT

and GROUND prongs, as illustrated in Figure 7.

Read the Ohmmeter and refer to TABLE 2.

Continuity Test

: With the Selector switch still in

the AC position and the AC cord disconnected,

use an Ohmmeter to measure resistance be-

tween the HOT and NEUTRAL prongs of the AC

cord connector, as in Figure 7. Read the Ohm-

meter and refer to TABLE 2.

5. If the Ground Fault or the Continuity Test meas-

ures a short (0 Ohms), this causes the 3 Amp

fuse to blow. Repeat the test where 0 Ohms was

measured but this time with the AC heater dis-

connected (Reason: to determine whether the

short is in the heater or the controls).

a. If the Ohmmeter still shows a short (0 Ohms),

the control panel has a short. Remove the

Control Assembly and lay back according to

the first four steps of the selector switch re-

moval procedure on page 12-20. Carefully in-

spect all connections for erroneous grounding

of electrical terminals. If nothing found, re-

place the Control Assembly. See page 12-18

for replacement procedure.

b. If the Ohmmeter now shows an open circuit,

the short is in the heater and must be re-

placed.

Figure 7 - Continuity Ground Fault Test - AC

TABLE 2 Ground Fault/Continuity Check

Test Points on AC Cord

Prongs

(See Figure 7)

Ohmmeter Reading Indication Action

Hot Terminal & Prong

0 Ohms

(dead short)

Indicates a

grounding fault

Go to Step 5

Hot Terminal & Prong Open Circuit Normal condition

Possibility of ground

fault is eliminated

Hot & Neutral Terminals 76 - 85 Ohms* Heater is good Go to Step 7

Hot & Neutral Terminals

above 85 Ohms or

below 76 Ohms

Heater is out

of tolerance

Replace heater

Hot & Neutral Terminals

0 Ohms

(dead short)

Indicates a short

in the AC circuit

Go to Step 5

Hot & Neutral Terminals

Open Circuit

(no reading)

Indicates an open

in the AC circuit

Go to Step 6

* If the heater is hot when the measurement is taken, the correct resistance range is 82-91 Ohms.

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