Advanced Instruments 3900, Service Manual

Page: 39 / 184

NOTE A tube-loaded cassette must be
used to run the following test. Place
the cassette in the (left) input deck,
with the cassette identification
number facing you.
6. From the test menu, select
“Tube
Transport Test”
(see User Guide
Calibration section). Press START to begin
the cycling. Allow the test to run through
the entire cassette while adjusting for any
misalignments (using the sensor adjusting
screw).
7. Tighten the two slotted locking screws.
8. Place a cassette in the input deck and run
through a normal sample test cycle. Check
for any misalignments between the sample
tube and cooling well.
9. Adjust the cooling well position by
loosening the three slotted screws (C),
loosening the V-block bracket and V-block
screws (D), and manually moving the well
into a position that minimizes/eliminates
any misalignment with the operating head.
NOTE If misalignment cannot be
adjusted by moving the well, the
position of the head will require
readjustment, and the entire
process from the insert mode
position adjustment must be
repeated.
39
Insert Mode Position
1. Enter the head rotation test from the test
menu and select <YES> for
“Insert Test”
.
Check the alignment of the operating head
in the insert well. Note the direction and
the amount of misalignment, if any.
2. Remove the back cover from the
instrument.
3. Manually rotate the head to probe wipe
position and slightly loosen the cap screw
(A) on the anti-rotation block.
4. Manually rotate the operating head over
the cooling well, using the position over
the well as a reference point.
5. Move the position of the head by noted
amount of misalignment. Retighten the cap
screw.
6. Readjust the operating head (position 1) as
described below.
7. Retest using the head rotation test (see
User Guide Calibration section) and
readjust, if necessary.
Operating Head (position 1)
1. Loosen the two slotted locking screws (B)
located above the sensor adjustment screw
(i.e., on the right side of the head rotation
cap).
2. From the test menu, select
“Head
Rotation Test”
(see User Guide
Calibration section). Press START to
begin cycling.
3. Note the direction and amount of the
misalignment of the probe from the center
of the tube sensor during the cycling.
4. Turn the sensor adjustment screw (A)
counterclockwise to move the head
position to the right, or clockwise to move
the head to the left.
5. Adjust until the sample probe is centered
with the tube sensor.
The Advanced ® Model 3900 Service Manual
C
B
A
D