Human Humalyzer 2000 - Page 27

Rev.
B
25
Lamp
replacement
The
lamp
should
be
replaced
only
if
it
fails
to
light,
or
several
filter
voltages
are
reported
as
low.
To replace the lamp:
1. Place the instrument in tube mode. Press CELL. The display shows:
Flowcell Settings
Flowcell Active Y/N
Press NO to select tube mode. Repeatedly press NO until the display shows
Ready. Select a Test.
Block: 37.0 Cell: 37.0
2. Setthe power switch to OFF (O). Open the instrument. Locate the photometer and the
lamp at the right side of the photometer. Refer to Figure 10-A, Lamp Removal and
Replacement. The figure shows the right side view of the photometer assembly.
CAUTION
Lamp is HOT. Allow the lamp to cool before handling.
3. Loosen but do not remove the 2 center lamp connector screws, Remove the lamp by
lifting it out of the connector.
4. Use a pair of pliers or tweezers to handle the new lamp. Avoid handling with bare skin.
Insert the lamp leads into the connector until they hit bottom. Refer to Figure 10-B,
Lamp Alignment. The lamp filament must be centered on the lens and the lamp body
must
be parallel with the lens bracket. While holding the lamp in alignment, tighten the
lamp connector screws.
5. Set the power switch to ON. Observe the projection of the light from the lamp onto the
cell holder (behind the lens). Refer to Figure 10-C, Spot Alignment. The spot should
be small and centered on the oval hole behind the lamp. If the spot is not centered, use
the adjustment screws to position the spot. The vertical adjustment screw raises and
lowers the lamp. The lamp bracket is slotted at the horizontal adjustment screw, so that
the lamp bracket can be moved. The horizontal adjustment screw serves to lock down
the lamp bracket. -
6. Insert a borosilicate 12 mm tube filled with plain water into the read well. Do not use a
soda-lime glass tube, since it does not transmit at 340 nm. Press MENU. Type 186
and press ENTER. The instrument prints the detected voltage for each filter position.
All voltages should be between 2.00 volts and 11.00 volts. If all the voltages report
low, repeat steps 5 and 6.
”“Humalyzer 2000 Service Manual