Hitachi HT-4139-28 Maintenance Manual page 71

REV0 10.02.15
＊Caution when replacing the Fluorescent Lamp
If you do not attach the lamp heater properly, the device may get damages and cause errors.
Read the below warning when going through the procedures
If there is an error in the light density, check if all procedures were performed correctly
Caution:
Make sure the Fluorescent Lamp and the Lamp Heater are positioned closely
The Lamp Heater heats up the Fluorescent Lamp and balances the light density. If the 2 are not positioned
closely, the Fluorescent Lamp will not heat up properly and may cause errors. Also, attached onto the Lamp
Heater is a Temperature Fuse. If the Temperature Fuse is disconnected, it may cause an error in the light density.
For instructions, please refer to procedure ④to check if the Temperature Fuse is attached properly.
① Check if the Lamp Heater is attached to 4 metallic clips. If it is not attached (As shown in exhibit A), make sure
to attach it to the clips (the Fluorescent Lamp may not attach to the Lamp Heater, if the Lamp Heater is not attached
to the clips).
(A)
Not fixed
Clip
② Check if there is no space between the Fluorescent Lamp and the Lamp Heater (For instructions, please refer to
Exhibit C)
(C)
-H8-8-
Lamp socket
Lamp Heater
good example
Lamp Heater
(B)
Lamp socket
Fixed with c lips
Clip
Clip
Lamp Heater
bad example
Clip
Lamp Heater