Human Humalyzer 2000 - Filter Replacement

Rev.B
27
Filter Replacement
Materials/tools required:
« Replacement filter set
* Phillips screw driver
« Flat blade screw driver
* Silicone adhesive
Open the instrument as described in "Opening the instrument". Refer to Figure 3. Locate the
photometer. Unplug both ribbon cables from the main PCB.
This is an important step for relocating upon reassembly. Mark with a pencil onto the
chassis along the front and side edges of the photometer subassembly.
Locate the (3) #6 screws holding the photometer assembly to the chassis, From the bottom of
the instrument, remove these screws and washer.
Refer to Figure 11. Remove the (3) 6-32 screws retaining the photometer cover. Set the
photometer cover aside.
Remove the (3) 4-40 screws securing the photometer PCB and gently move it aside.
Remove the filter wheel belt from the filter wheel and motor pulley. Loosen the filter wheel
shaft. Remove the shaft and filter wheel. Note the number of nylon washers and the order of
installation.
Refer to Figure 12, Locate the filter to be removed. Push the filter out of the wheel using the
eraser end of a pencil or other soft blunt object. Remove all filter components from that posi-
tion in the wheel.
Locate the neutral density filters, dot screen, and transmittance filters that were included with
the replacement filter and drop them first into the cavity. Install the interference filter with the
mirror side down. Place (2) very small dabs of silicone adhesive on either side of the filter to
prevent it from working loose. Avoid smearing silicone adhesive on the filter surface. Allow
the adhesive to cure overnight.
: Install the filter wheel taking care not to pinch washers under thě“shafi Reassem the: ‘shaft
11.
12.
13.
14.
Replace the photometer cover, taking care to position the cable in the slot of the cover. Do not
pinch the cable under the cover. Tighten cover screws only until snug. Do not over tighten the
photometer cover screws!
Install the photometer subassembly to the chassis by replacing the (3) #6 self tap screws
through the chassis base. Line up photometer with locating marks made in step 2. Connect the
(2) cables removed in step 1.
Attach the power cord and connect the instrument to the mains supply. Set the power switch to
“ON (1). Select test #186. The displayed numbers represent the voltages of the installed filters.
All voltages should be between 2 and 11 volts.
Humalyzer 2000 S.