Monitor GF1800 - Test Point Voltage; All Readings Take from EP (0 V)

MONITOR HEATING SYSTEM
Section 5: Troubleshooting IGF38001
TEST POINT VOLTAGE
All readings take from EP (0V)
\. Operation
""\Mode
Test Point \^^
TP1
TP2
TP3
TP4
TP5
TP6
TP7
TP8
Preparation
27V ±50%
12V ±30%
5V ±10%
O.Wmax.
pulse
pulse at plug in
O.Wmax.
1.5— 3.2V
Pre-purge
27V ±50%
12V ±30%
5V±10%
O.Wmax.
pulse
5V±10%
O.Wmax.
1.5— 3.2V
Igniting
27V ±50%
12V ±30%
5V±10%
infinity variable
pulse
5V±10%
NAT 0.41 -0.84
LP 0.35—0.78
1.5-3.2V
Pre-combustion
27V ±50%
12V ±30%
5V ±10%
1.2Vmin.
pulse
5V±10%
NAT 0.41 -0.84
LP 0.35-0.78
1.5-3.2V
""\^ Operation
\^Mode
Test Point ^\^
TP1
TP2
TP3
TP4
TP5
TP6
TP7
TP8
High
27V ±50%
12V ±30%
5V ±10%
1 .2Vmin.
pulse
5V±10%
NAT 0.65 -1.05
LP 0.57-0.97
1.5-3.2V
Low
27V ±50%
12V±30%
5V±10%
1.2Vmin.
pulse
5V ±10%
NAT 0.38-0.78
LP 0.32—0.72
1.5-3.2V
Off
27V ±50%
12V ±30%
5V±10%
O.Wmax.
pulse
5V ±10%
O.Wmax.
1.5-3.2V
Post-purge
27V ±50%
12V ±30%
5V ±10%
O.Wmax.
pulse
5V±10%
O.Wmax.
1.5-3.2V
Abnormal readings of TP1 and TP2 can be caused
by either failure of a transformer or PCB.
Abnormal readings of TP3-TP8 caused by failure of PCB.
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