Monitor GF3800 Servise Manual page 61

SYMPTOM CHECK1 I RESULT CHECK2
J I
mode is inproper. I display normal? 1 •• ' approx. 2.8V
I
Connect 10KD resistor at 0 pins,
and ttien. set temperature from
varve 30 ie to
flow rate?
•
I RESULT I
j ~ i
i i
J Y r 1
" "^ 1
CHECKS
fan motor able
to change
speed?
1 RESULT
i i
" i
1 CHECK4
RESULT | CHECKS 1 1 RESULT 1
-
-
-
-
-
-
L
L
-
-
-
-
-
-
-
L
REASON
1
i
(R41,R42)
(C29,
C30)
Failure of microprocessor.(ICI)
Failure of operational amplifier.
(IC9)
Failure of dkxte.(025. D26)
Failure of transistor.(Q2, Q4)
Failure of resistor.(R35-R38)
Failure of oapacitor.(C25-C27)
Failure of photo triac.(IC2)
Failure of transistor arrey.(IC13)
Failure of circulation fan motor.
F I f (IC1)
Failure of transistor arrey.(IC13)
Failure of photo tnac.(IC3, IC4)
Failure of triac.(Q1)
Failure of resistor.(R5,R66,R67)
Failure of capatitor.(C2)
Failure of combustion blower.
(
Failure of resistor of combustion
blower.
Failure of damper solenoid.
j CORRECTIVE MEASURE
~~| Replace circulation fan motor.
1 Replace combustion blower.
1 Replace clamper solenoid.