Hitachi HT-4139-28 Maintenance Manual page 72

③ Check if the Fluorescent Lamp and the Lamp Heater is parallel.
(D)
Clip
④ Checking the Temperature Fuse
Check if the pins (5-A~5-B and 6-A~6-B) on connector J83 are maintaining the normal level. If the connector is
disconnected, make sure to replace Lamp ASSY
（F）
B
A
Connector J83
good example
Clip
Parallel
Lamp Heater
5
6
(E) bad example
Clip
Specifications
# Pin
6-A～6B
5-A ~ 5-B
1
(Heater)
6-A ~ 6-B
2
(Thermostat)
5-A～6B
REV0 10.02.15
Uneven
Clip
Normal Level
Below 100Ω
(40Ω/50℃)
Below 50KΩ
(20KΩ/25℃)
-H8-9-