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TROUBLESHOOTING & REPAIR
CONTROL BOARD TRANSFORMER (T3) TEST (continued)
FIGURE F.11 – CONTROL BOARD TRANSFORMER (T3) LEADS
CONTROL BOARD TRANSFORMER (T3)
CONTROL
BOX
PRIMARY LEADS | SECONDARY | |
LEADS #281 | ||
#255 AND #256 | ||
| AND #282 |
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TEST PROCEDURE
1.Disconnect the main AC input power to the
2.Remove the case top and sides.
3.Locate the control board transformer (T3) mounted on the rear of the control box. See Figure F.11.
4.Locate the transformer (T3) primary leads (#255 and $256). See Figure F.11 and the Wiring Diagram. Also locate the secondary leads (#281 and #282).
WARNING
ELECTRIC SHOCK can kill.
• Do not touch electrically hot parts.
5.Apply the correct
6.Carefully check for 42 VAC at the secondary leads (#281 to #282). If 42 VAC is present, the control board transformer (T3) is good. If 42 VAC is missing or low, proceed to the next step.
7.Carefully check for 115 VAC at the primary leads (#255 and #256). If the 115 VAC is present but the secondary voltage (42 VAC) is missing or low, the T3 transformer may be faulty. Replace.
8.If the 115 VAC is NOT present at the prima- ry leads, check the associated switch (SW1) and wiring. See the Wiring Diagram.
