Hitachi HT-4139-28 Maintenance Manual page 68

④ Loosen 2 washer faced heads screw and pull the Lamp Bracket in the direction shown below. Remove
Fluorescent Lamp from the lamp socket.
⑤ Replace the Fluorescent Lamp
Caution: Do not use force to lift the Fluorescent Lamp.
To attach the Fluorescent Lamp, push in the Fluorescent Lamp and place the Lamp Heater over it. If you
apply pressure on the tip of the lamp, the lamp may get damaged.
Lamp socket
Pull
Insert
Remove
Mount
⑥ Take the reverse steps to attach the Fluorescent Lamp to the device.
⑦ After attaching the Fluorescent Lamp, run the Auto Calibration Test (refer to Chapter 6)
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 with 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)
Clip
#4 Fluorescent lamp
Lamp Bracket
Washer faced heads screw
(B)
Hook
Not fixed
Lamp Heater
Lamp Heater
Fixed withclips
Hook
Clip
Lamp Heater
REV0 10.02.15
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