GE DPVH880EJ Technical Service Manual page 44

Electric Dryer Element Operation - Normal Heat Cycle
• To measure electric heater amperage, locate and read current on the orange wire connecting the high
limit thermostat terminal 3 to MT1 on the triac.
• To measure triac gate voltage (VDC), read between J4 Pin 3 (logic ground) and board location JT27.
Amperage Reading Location
1. The K8 relay closes J10 Pin 1 to J10 Pin 5. This energizes the inner coil. At the same time the triac is gated
with 4.8 VDC. MT1 to MT2 close, turning on the outer coil. At this time both coils are energized and the
heat system is drawing approximately 24 amps.
2. As the drum temperature begins to rise, the triac gate voltage begins to pulsate between 4.8 and 0 VDC.
The current draw of the outer coil begins to drop. The heat system is now drawing somewhere between
16 and 20 amps.
3. Triac gate voltage fi nally drops to 0 VDC. The outer coil is off. The inner coil is still operating. The system is
now drawing approximately 12 amps.
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J4 Pin 3
JT27
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