REMOVE AND REPLACE DEFECTIVE MODULES IN THE
INTER-ORAL DENTAL X-RAY
This lesson covers the general procedures for removing and replacing defective
modules in the Heliodent 70 Portable X-ray Unit. The modules selected represent a
portion of the total number of modules in this piece of equipment. The skills required to
remove and replace these modules are transferable to removing and replacing all
modules. The modules covered are: scissors arm cabling, rotational parts, pcb, and the
carrying case gasket.
EXCHANGING SCISSORS ARM CABLING
If the cabling in the scissors arm of the dental X-ray unit is damaged, you should
return the defective scissors arm to SIEMENS MEDICAL SYSTEMS, INC. Dental X-Ray
Division. If you cannot return the defective scissors arm, you will need to remove and
replace it. To remove and replace the cabling you will use the materials in paragraph a.
and the procedures in paragraph b. below.
a. Materials. For the fitting of a new cabling you need the following articles:
cabling, 2 profiles, a set of 5 shrink (length 1/2 inch), insulating tubing (lengths of 2 1/2
inches and 4 3/4 inches), and adhesive.
b. Procedures. Refer to figure 4-1.
Prepare the scissors arm.
(a) Unplug the unit from the power source.
(b) Put the safety strap (9) in place.
(c) Disengage the scissors arm assembly (10) from the coupling as
shown in figure 4-1.
(d) Disconnect multi-pin plug (11) by unscrewing the lock ring in the
direction of the arrow.
(e) Place the protective sleeve over the multi-pin connector (11).
Route the greenfield tubing and tighten the strap securing the arms.
(g) Lay the scissors arm and X-ray head on a flat surface.