Keeler vantage+ User manual
2415
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7011
Issue
A
07/07/2008
Indirect Ophthalmoscope
Service Manual
ALWAYS READ THE INSTRUCTIONS
Keeler Limited, Clewer Hill Road, Windsor, Berks, United Kingdom. SL4 4AA.
Tel No. +44 (0) 1 753 857177
Fax No. +44 (0) 1 753 830247
Vantage + Service Manual
2415
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7011
Issue
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07/07/2008
C
ONTENTS
Introduction
1
Service Principles
1
Tools Required
2
Precautions
3
Disassembly
4
Remove the Optics Head from the Browbar
4
Remove the Front Cover
5
Remove the Optics Head and Illumination Assy.
6
Reassembly
8
Refit Illumination Assy and Viewing Assy
8
Refit to Browbar
10
Spare Parts List
13
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Introduction
This manual covers servicing of both the Bulb and LED illuminated versions.
The only difference lies in the Illumination Assy and the Dimmer PCB Assy
which are not interchangeable.
Damage may occur if an attempt is made to mix the Bulb and LED
Illumination Assy and Dimmer PCBs.
All drawings refer to the LED version with notes where appropriate for the bulb
version.
Service Principles
The Vantage + comprises a numbe
r of modules which have been built and
aligned in the factory. These modules can not be reliably aligned without the
special jigs and should not therefore be disassembled further than described
in this manual. There is a strong possibility of the unit de
veloping diplopia or
hyperphoria if the Viewing Optics are disassembled or adjusted.
Where a sub
-
assembly is quoted it cannot normally be reliably repaired
without special tools, adhesive and/or jigs.
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Tools Required
Most of the tools required will be in
standard electro
-
mechanical toolkit.
The following special tools will make assembly and disassembly easier.
TD351
Lock Ring Key for Eyepieces.
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Precautions
Care should be taken to carry out any repair work on a clean soft surface to
minimise damage to th
e outside of the unit.
Solvents should
not
be used for cleaning.
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Disassembly
Virtually all repairs inside the head unit except changing the Centre Mirror
involve removing both the Viewing Optics Assy and the Illumination Assy from
the Rear Cover. This i
nvolves removing the whole Optics Assy from the
Browbar.
Remove the Optics Head from the Browbar
1.
Unplug the power supply from the Dimmer Block.
2.
Remove the Browbar from the Headband by undoing the knobs.
3.
Remove 3 off No2 x PT screws (19) holding the Dimmer Block to the
Browbar.
4.
Carefully unsolder the 2 wires from the PCB (31). It may be easier to
remove the PCB Assy from the Dimmer Housing (7).
4.1.
Slide the Blue Indicator Pin (23) out of the Control Knob (6).
4.2.
Slacken the A
llen Screw holding the Knob to the Dimmer Control and
remove the Knob.
4.3.
Undo the Nut on the Dimmer Control
4.4.
Remove the Dimmer PCB Assy.
Note that these wires will need to be re
-
soldered after the repair is
completed and there is insufficient spare length to
strip the wires again.
5.
Undo the Hinge Clamp from the Hinge Pin and remove the Hinge Pin
taking care not to lose the Spacer or the 2 washers under the Hinge
Clamp.
6.
The Optics Head can now be separated from the Browbar.
Figure 1
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Remove the Front Cover
1.
Remove 2 of
f Mirror Spindle Knob (25) by gently pulling.
2.
Carefully lift 2 off Control Knob Label (21) with the point of a sharp blade.
They are self adhesive.
3.
Remove 2 off M2 x 8 Csk PT Screws (32) from the centre of the 2 Control
Knobs.
4.
Remove the 2 Control Knobs (
17).
5.
Turn the Optics Head over and slide the Eyepieces to the middle to reveal
2 off M2 x 8 Csk PT Screws (Figure 3
13). Remove these screws.
6.
Remove 2 off M2 x 8 Csk PT Screws (Figure 3
13) from the top of the
unit above the Browbar Mount.
7.
Lift the
Front Cover off by carefully prising the sides by the filter controls
apart to allow the cover to slide over the filter controls.
8.
Carefully remove the Light Shield (12).
9.
Remove the Mirror Spindle (29).
Figure 2
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Remove the Optics Head and Illumination Assy.
1.
Unscre
w 2 off Eye Cap (3) being careful not to lose the +2D Eye Lenses
(2).
2.
Unscrew 2 off Eyepiece Lock Ring using TD351 Lock Ring Key.
3.
Remove 2 off P D Slider (18)
4.
Turn the unit over
Figure 3
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5.
The Viewing Assy (27) and Illumination Assy (28) are joined by the Centre
Spindle (24) and must be removed together.
6.
Remove 2 off M2 x 8 Csk PT Screws (13) from the Viewing Assy (27).
7.
Remove 4 off M2 x 8 Csk PT Screws (13) from the Illumination Assy (13)
8.
Carefully lift the 2 assemblies together from the Rear Cover Moulding (17)
9.
The 2 assemblies can now be separated.
Further disassembly of either the Illumination Assy or the Viewing Assy is not
advised as special tools and jigs are required to reassemble and align.
Figure 4
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Reassembly
Refit Illumination Assy and Viewing Assy
Great ca
re must be taken to avoid any strain on the Eyepiece Mirror Mounts
as these have been carefully aligned on the laser jig during manufacture.
Avoid holding the Viewing Assy by the Mirror Mounts.
Refer to Figure 4
1.
Stand the Viewing Assy on its base.
2.
Locat
e the Centre Spindle (24) in the base of the Viewing Assy so that the
peg on the moving Centre Mirror Assy engages with the slot on the Centre
Spindle
3.
Locate the Illumination Assy onto the top end of the Centre Spindle so that
it engages with the Gratic
ule Carrier. It will be necessary to rotate the
Graticule Wheel to the smallest aperture so that the link is sticking out.
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