Kyocera KM-1500 Service Manual page 171

2DC
Variation
No.1
(Duty 100 %)
Variation
No.2
(Duty 80 %)
Variation
No.3
(Duty 60 %)
Variation
No.4
(Duty 40 %)
Variation
No.5
(Duty 0 %)
2-3-6
Heater lamp turn-on pattern in 1 cycle (10 half waves)
1
AC wave
+
0 V
Zero
−
cross
point
Conductivity
On On
staus of Triac
(TRC1)
+
0 V
−
On On
+
0 V
−
On On
+
0 V
−
On Off
+
0 V
−
Off Off
Figure 2-3-5 Heater lamp turn-on variations
2 3 4 5 6
On On On On
On On On On
Off On On Off
Off On Off Off
Off Off Off Off
7 8 9 10
On On On On
On On Off Off
On On Off Off
On On Off Off
Off Off Off Off