Output power
•With the computer plugged in and turned on, check for 14VDC from pin 5 on the computer terminal to ground.
10.3 Transformer
Symptom: Unit has no display
Test:
•Line voltage should be measured across the input side of the transformer; 12VAC should be measured across the output side.
10.4 Plate Heater RTD
The following tests are conducted without power applied.
Symptom: Unit displays Probe. Actual plate temp is not within 5°F of setpoint. Temperature must be taken from thermocouple built into unit.
Test:
•With power removed from the HLZ, measure resistance between pins 9 and 13 on the
Resistance Chart
Centegrade | Fahrenheit | Ohms |
21 | 70 | 1080 |
27 | 80 | 1101 |
32 | 90 | 1122 |
38 | 100 | 1143 |
43 | 110 | 1164 |
49 | 120 | 1185 |
54 | 130 | 1206 |
60 | 140 | 1226 |
66 | 150 | 1247 |
71 | 160 | 1268 |
77 | 170 | 1289 |
82 | 180 | 1309 |
88 | 190 | 1330 |
93 | 200 | 1350 |
99 | 210 | 1371 |
104 | 220 | 1391 |
110 | 230 | 1412 |
116 | 240 | 1432 |
121 | 250 | 1453 |
127 | 260 | 1473 |
132 | 270 | 1493 |
138 | 280 | 1514 |
143 | 290 | 1534 |
149 | 300 | 1554 |
computer plug and compare readings to listing on the resistance chart. With the unit cool, the resistance reading should approximate the
resistance shown on the chart for the room temperature. Also check for short to ground. A chaffed wire shorting to the chassis can produce resistance readings within proper range.
10.5 Air RTD
Symptom: Unit displays Probe. Actual air temp is not within 5°F of setpoint.
Test:
•With power removed from the HLZ, measure resistance between pins 14 and 15 on the computer plug and compare with air temperature on the resistance chart in this section. Also check for short to ground. A chaffed wire shorting to the chassis can produce resistance readings within proper range.
Frymaster L.L.C., 8700 Line Avenue 71106, P.O. Box 51000, Shreveport, Louisiana
Printed in the United States | Service Hotline | Page 16 |
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