24
308219
Troubleshooting –
Electrical Resistance Checks
Triac
1.
Follow the
Setup
instructions on page 20.
2.
Grasp the connector of each triac lead and unplug
them from the triac (281). See Fig. 13, page 25.
3.
Clamp the positive and negative meter leads to the
pins indicated in the chart in Fig. 12. Replace the
triac if any one of the readings is incorrect.
NOTE:
When using a digital V.O.M. with automatic
range, for example, a Model 77 Fluke, infinity = 10
megohms or greater.
4.
To replace the triac, see page 25.
A
B
C
Large
Black
Wire
Large
White
Wire
Small
White
Wire
01694
+
POSITIVE
METER LEAD
TO PIN
–
NEGATIVE
LEAD
TO PIN
CORRECT
READING
OHMMETER
SETTING
A
B
C
–
+
C
A
0–100 ohms
200 ohms
A
B
C
–
+
C
B
Infinity
200K ohms
A
B
C
–
+
A
B
Infinity
200K ohms
A
B
C
– +
B
A
Infinity
200K ohms
Fig. 12
Summary of Contents for FOAM-CAT 200 Series
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