Hach DR/2010 User manual

46645-88
DR/2000 and DR/2010 Spectrophotometer
Lamp Replacement
Purpose
These instructions provide a step-by-step procedure for replacing the lamp in DR/2000 and
DR/2010 Spectrophotometers. Remember, a wavelength calibration adjustment must be done
after replacing the lamp. See the Wavelength Calibration Adjustment instructions shipped with
the lamp.
The lamp shipped with this instruction sheet is one of two designs. One lamp has a single square
slot and a light slit (see Figure 1). The other lamp has a v-shaped slot and a square slot (see
Figure 2). Instructions for installing each lamp are slightly different in step 4.
Lamp Replacement
If the lamp fails and must be replaced, proceed as follows.
1. Disconnect the Battery Eliminator and the RS 232 connector. Turn off the power switch and
empty the cell holder. Place the instrument upside down on a padded surface.
2. Remove the two screws securing the lamp compartment cover and remove the cover (see
Figure 1).
3. Remove the lamp retainer screw and metal sleeve from the lamp channel. The sleeve is
tapered at the bottom end, and, because of its snug fit, probably needs to be loosened with a
tool (needle-nose pliers are recommended) for removal. Remove the lamp. Loosen the two
terminal screws to free the lamp leads.
4. To replace a lamp with two notches (Figure 1), place the new lamp in the lamp channel with
the light slit toward the light slit in the channel.
To replace a lamp with a single notch (Figure 2), place the new lamp in the lamp channel
with the V-shaped groove facing the wavelength dial. The square notch in the new lamp
should be placed against the side with the retainer screw.
5. Push the lamp to the bottom of the lamp channel and install. Firmly tighten the lamp retainer
screw and sleeve in the channel to secure the lamp. Secure the sleeve with the beveled end
down. The lamp must be held tightly in the proper position, flush against the bottom, the
end, and the light slit side of the lamp channel (see Figure 2). Connect the lamp leads of the
new lamp assembly at the lamp terminals (lead orientation does not matter).
Do not overtighten.
6. Install the lamp compartment cover. Return the instrument to the upright position and
restore power.
Note: Some internal components are sensitive to static and may be damaged by external static electricity.
Always re-install the lamp cover after maintenance or servicing.
7. Perform the Lamp Calibration Adjustment procedure described in the instruction shipped
with the lamp.

2
LAMP REPLACEMENT, continued
Figure 1 Lamp Replacement For Lamp With Two Notches
Lamp Compartment Cover
Lamp Retainer Screw
Metal Sleeve
Lamp Assembly
Lamp Terminals
Light Slit
Lamp
Retainer
Screw
Lamp Holder
Lamp Channel
Lamp holder must
be flush against
bottom and the two
channel surfaces
indicated by arrows.
Lamp
Channel
Lamp Holder
Light Opening

LAMP REPLACEMENT, continued
3
Figure 2 Lamp Replacement For Lamp With One Notch

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© Hach Company, 1999, 2003. All rights reserved. Printed in the U.S.A. te/dk 5/03 5ed