3900 CHAIR
ALWAYS READ AND FOLLOW ALL SAFETY/
REGULATORY INFORMATION AND NOTIFICATIONS
PROVIDED IN THE COMPLETE INSTALLATION AND
OPERATORS GUIDE FOUND AT WWW.DENTALEZ.COM
SPECIFICATIONS
Input voltage
Control voltage
Fuses
Duty cycle
Protection against
electrical hazards
Maximum patient weight
Delivery system capacity
Total lift capacity
Noise level
CHAIR OPERATION
Chair Rotation
STEP 1: To swivel the chair, unlock the chair brake by moving
the brake handle at the back of the chair to the right (FIG. 1).
STEP 2: Swivel the chair to the desired position.
STEP 3: Lock the chair brake by moving the brake handle
at the back of the chair to the left.
FIG. 1: SWIVEL BRAKE HANDLE
BRAKE HANDLE
STOP LOCK
Armrest
STEP 1: To lower the armrest, push the button located on the
arm assembly (FIG. 2).
STEP 2: To raise the armrest, lift up the lowered end of
the armrest until the armrest stops and clicks into the
locked armrest position.
FIG. 2: ARM BUTTON
ARM BUTTON
115 VAC/230 VAC 50/60Hz
5 VDC
115VAC F1/F2 -10A, F3-125mA
230VAC F1/F2 - 6.3A, F3-63mA
5% (intermittent 25s ON, 300s OFF)
Class I device, Type B
300 lbs (136 kg)
125 lbs (57 kg)
450 lbs (225 kg)
<40 dB
©2025 DENTALEZ, Inc. DENTALEZ is a registered trademark of DENTALEZ, Inc.
Designer Friendly is a registered trademark. Inc. UltraLeather is a registered trademark of Ultrafabrics, Inc.
OPERATORS QUICK START GUIDE
CHAIR OPERATION (CONTINUED)
Headrest
Positioning the articulating headrest properly to support the head
in its natural relationship to the spine reduces tension in the neck
and jaw muscles decreasing the request for "open wider please" .
STEP 1: While in upright position fully depress the release
mechanism on the right and adjust headrest to match
patient's height.(FIG. 3).
STEP 2: Articulate the headrest cushion to contact the back
of patient's head.
STEP 3: Recline patient. If necessary, using the release
mechanism, fine tune headrest position (FIG. 4).
NOTE: The use of disposable headrest covers are
recommended to prevent soiling of the headrest.
FIG. 3: UPRIGHT
FIG. 4:
RECLINE
Headrest Positioning for Wheelchair
The headrest can be used to accommodate wheelchair patients.
STEP 1: Slide the headrest up until it is free from the chair.
Turn the headrest 180°.
STEP 2: Slide the reversed headrest back into the backrest
and push it all the way down.
STEP 3: Run the chair to its full back up position. Adjust
headrest height by moving the chair up or down (using the
base up function on the footswitch or touchpad).
STEP 4: Position patient. If necessary fine tune headrest
position (FIG. 5).
CHAIR
FIG. 5:
HEADREST
POSITIONING
FOR WHEELCHAIR
RELEASE
MECHANISM
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