TM 10-6630-245-13&P
a.
Removal.
WARNING
High voltage used with Spectrophotometer. Misuse can cause electrical shock and damage
equipment. When operating with 115V or 220V power, make sure the power source and
equipment are in ground potential. Ensure that the power cable connections are correct for the
desired voltage power before connecting the power source.
(1)
Disconnect the lamp cable(4, fig. 4-2) from the amplifier board(3) at connection BC4(2).
(2)
Loosen the bulb setscrew(l) in the lamp holder(6) and extract the lamp(5).
b.
Replacement.
CAUTION
Do not over tighten the bulb set screws. Bulb damage could result.
NOTE
Replacement lamp assembly is located in bottom of Spectrophotometer case.
(1)
Install the replacement lamp assembly into the lamp holder(6). The lamp(5) must be aligned with the lamp
filament positioned vertically. It must be placed as far into lamp holder(5) as possible.
(2)
Attach lamp cable to amplifier board at BC4(2).
(3)
Replace front panel and ensure that the unit is properly connected. See para 2.6.2.3.a. for ac operation;
see para 2.6.2.3.b. for dc operation.
c.
Alignment.
(1)
Check bulb alignment by placing a piece of paper in the sample cell well(5, fig. 2-5) on the right hand wall.
Turn the on/off toggle switch(12) to ON. Adjust the wavelength dial(8) to 550 nm to bring the bulb filament
image into focus on the paper. If the image is dim, turn LIGHT CONTROL knob(l0) to intensify light.
Proper alignment gives an image of an oval completely enclosing a vertical filament image(7, fig. 4-2).
(2)
If alignment is required, remove front panel (see para 2.6.2.3).
(3)
Adjust the filament image by loosening the set screw(l) and rotating the lamp holder(6).
(4)
Replace front panel and ensure that the unit is properly connected. See para 2.6.2.3.a. for ac operation;
see para 2.6.2.3.b. for dc operation.
(5)
Repeat steps (1) thru (4) above if further adjustment is required.
Figure 4-2. Adjusting Lamp.
4-5
