Monitor GF1800 - Page 51

MONITOR HEATING SYSTEM
Section 5: Troubleshooting IGFISOO
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.IVmax.
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 0.40~0.83
LP 0.40~0.83
1.5-3.2V
Pre-combustion
27V ± 50%
12V ±30%
5V±10%
1.2Vmin.
pulse
5V ±10%
NAT 0.40—0.83
LP 0.40~0.83
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%
NAT0.65~1.05
LP 0.63~1.03
1.5-3.2V
Low
27V ±50%
12V ±30%
5V±10%
1.2Vmin.
pulse
5V±10%
NAT 0.36~0.76
LP 0.36~0.76
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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