Hitachi HT-4139-28, Maintenance Manual

Page: 69 / 126

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
bad example
good example
Lamp Heater
③
Check if the Fluorescent Lamp and the Lamp Heater is parallel.
(D) good example (E) bad example
Lamp Heater
Clip
Parallel
Uneven
Clip
Clip
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)
A
Connector J73
6-A ～ 6-B
B
5
6
5-A ～ 5-B
Specifications
#
Pin Normal Level
1
5-A ~ 5-B
(Heater) Below 100 Ω
(40 Ω /50
℃
)
2
6-A ~ 6-B
(Thermostat) Below 50K Ω
(20K Ω /25 ℃ )
-H8-6-