Hitachi HT-4139-28 Maintenance Manual page 69

REV0 10.02.15
② Check if there is no space between the Fluorescent Lamp and the Lamp Heater (For instructions, please refer
to exhibit C)
(c)
Lamp Heater
③ Check if the Fluorescent Lamp and the Lamp Heater is parallel.
(D) good example
Parallel
Clip
④ Checking the Temperature Fuse
Check if the pins (5-A~5-B and 6-A~6-B) on connector J73 are maintaining the normal level. If the connector is
disconnected, make sure to replace Lamp ASSY
(F)
B
A
Connector J73
-H8-6-
good example
(E) bad example
Clip
Lamp Heater
5
6
6-A ～ 6-B
5-A ～ 5-B
bad example
Lamp Heater
Clip
Uneven
Specifications
# Pin
5-A ~ 5-B
1
(Heater)
6-A ~ 6-B
2
(Thermostat)
Clip
Normal Level
Below 100Ω
(40Ω/50℃)
Below 50KΩ
(20KΩ/25℃)