SERVICE MANUAL FOR INFANT INCUBATOR EDITION/REVISION B/0
Heat circuit failure alarm H1.0
Disconnet power supply, measure resistance of two
terminals for heater
5-18
I2
yes
Replace heater
no
Heater is open circuit or
short circuit?
Conneat power board and main board
Element number from here is on
power board
Connect pin 1 (ssr-ctr) and pin 3
(relay-ctr) on J8 to VCC power make two
conrol signals high level
no
Base of triode Q2, Q
is >0.7V?
Check triode Q2, Q3
and resistor R8,R9
yes
no
there +12V on solid
relay and control
terminal of relay K1
Replace triode
Q2 or Q3
yes
To sheet 2
FLOW CHART 5.11 HEAT SYSTEM FAILURE (SHEET 1 OF 4)
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