Monitor GF3800 Servise Manual page 60

SYMPTOM CHECK1 RESULT 1 CHECKS CHECK3
RESULT
I CHECKS I I RESULT
Is there OV at
IC7(©pin)?
FLAME ROD BYPASS CIRCUIT
For testing purposes — A flame detector rod bypass circuit can be made up,
consisting of 2 insulated alligator clips, 2-6* pieces of insulated copper wire, 1 -1
ampere 400 volt diode, and 1-1/4 watt 100K OHM resistor.
These components are to be soldered together in sequence as shown in
diagram below (note component sequence and polarity).
Once the bypass circuit is made the unit is turned on, immediately after the
prepurge cycle; when mode light comes on, the 0 and N pins are disconnected
off the PCS and replaced with the bypass circuit
The unit should then continue functioning as though it had a good flame inside
the bum chamber.
(Note-WARNING, after all tests are completed, replace original flame rod wires
as it is a vital safety feature.)
CLIPS
REASON
Failure of resistor.
(R8-R11)
Failure of transformer.
Failure of capacitor.
(C16-C18)
Failure of resistor.
(H6, R12-R15)
Failure of resistor.
(R19,
R57)
Failure of capacitor.
(C33)
Failure of diode.
(D27,
029)
Failure of transistor array.
(IC11)
Failure of resistor.
(R16-R18)
Failure of microprocessor.(IC1)
Failure of wiring for flame
sensor and ground.
Incorrect installation of flame
sensor rod.
Rame rod has burned off or
has broken loose.
Failure of comparalor.(IC7)
CORRECTIVE ItSKK
Replace transSrmr.
•
Correct wiving.
Correct instil laon.
1
Replace liumlorbmjiwa
sensor.
w :