Gilson Company, Inc.
GilSonic AutoSiever: GA-6
Page 11
At a minimum, an appropriately sized reference material will be
needed. Gilson offers Whitehouse Sieve Standards, which are single-
use vials of glass beads for use on individual sieves. We also have
Standard Reference Materials supplied directly from NIST or BCR
(European Community Bureau of Reference), designed to cover
a range of sizes. These materials are intended for use to monitor
average size openings on sieves, but will also reflect the repeat-
ability of an individual AutoSiever unit over time.
For the most meaningful results, the reference material should
be tested on a master sieve or set of sieves and sieve stack as-
sembly that is set aside only for this purpose. AutoSiever con-
troller settings must be the same for each performance check.
If significant variations are found, adjustment of amplitude or
time settings or changing the diaphragms may reconcile the
results. If these adjustments do not help, it may be a sign of
more complex problems. Gilson may be consulted at any time
to assist with diagnosis.
10.0 MAINTENANCE & REPAIR
10.1 General Repairs
Simple replacement of speakers, lamps and fuses are easily ac-
complished by following the instructions below. More complex
diagnosis and repair should be performed in cooperation with
Gilson personnel or by returning the unit to Gilson.
WARNING!:
Always disconnect the unit from
its power supply before attempting any maintenance,
adjustment or repair procedure.
10.2 Speaker Replacement
A. Disconnect power by unplugging and removing the power
cord from the rear of the unit.
B. Remove the 7 Phillips-head screws on the top of the unit
and remove the case top and handle.
C. Note orientation of the speaker and remove the two lugged
wires from the terminals.
D. Remove the 4 slotted screws holding the speaker in place
and remove the speaker from the case.
E. Install the replacement speaker in correct orientation.
F. Reinstall the 4 slotted screws and tighten snugly.
G. Gently attach lugged speaker wires, taking care not to bend
terminals.
H. Replace top and handle and reinstall the 7 Phillips-head
screws. Tighten snugly.
I. Replace power cord in rear of unit.
10.3 Fuse Replacement
A. Disconnect power by unplugging and removing the power
cord from the rear of the unit.
B. The fuse holder is contained in the power receptacle at the
rear of the unit. The fuse holder is a small “drawer” at the
bottom of the receptacle, which may be opened with a
fingernail or small screwdriver. The fuse holder can then be
pulled out.
C. There are two 5 amp \fuses in the holder. The one closest to
the cabinet is the functional unit. The fuse to the outside is
a spare.
D. Test the fuse for continuity with an ohmmeter. If no continu-
ity, replace with the spare fuse.
E. Push the fuse holder back in until it latches.
F. Replace the power cord.
10.4 Lamp Replacement
A. Disconnect power by unplugging and removing the power
cord from the rear of the unit.
B. Open the Sieving Chamber door and remove the Sieve Stack,
if necessary.
C. Remove the two Phillips-head screws securing the stainless
steel diffuser bezel.
D. Remove the bezel and diffuser lens.
E. Carefully pull straight up on the lamp to remove.
F. Insert replacement lamp, pushing gently down into place
to seat.
G. Replace bezel and diffuser and reinstall the two Phillips-head
screws.
H. Replace the power cord.
