Advanced Instruments 4D3 - Head Sensor Adjustment

The Advanced
®
3D3/4D3 Service Manual
46
1. Turn off the power and unplug the instru-
ment. Remove the cover and the head
cover.
2. Manually push the head all the way down
until the head stop screw (A) meets the
base of the deck (B).
3. The head position sensors are located on
the head sensor board.* To adjust the
head sensor position, use an Allen wrench
and loosen the two bracket screws (C),
and move the board (D) and bracket (E)
either up or down until the head sensor
flag (F) is in the middle of the head down
sensor (G).
*If you have a 4D3 cryoscope without a
suffix, the head sensors are mounted
directly to the bracket, and not to the head
sensor board.
Note: If your instrument is equipped with an
Intel control board set, a series of
diagnostic LEDs have been provided to
allow visual identification of drive sig-
nals and sensor activation. The yellow
LEDs marked “Drive Up” and “Drive
Dn” indicate that the control electron-
ics have issued a command to the head
motor relays. The red LEDs marked
“Head Up” and “Head Dn” indicate
that the corresponding optical sensor
has been tripped.
B
A
C
D
E
F
G
Head Sensor Adjustment