Keeler Vantage+ User manual

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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

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ONTENTS

Introduction

Service Principles

Tools Required

Precautions

Disassembly

Remove the Optics Head from the Browbar

Remove the Front Cover

Remove the Optics Head and Illumination Assy.

Reassembly

Refit Illumination Assy and Viewing Assy

Refit to Browbar

Spare Parts List

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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

Unplug the power supply from the Dimmer Block.

Remove the Browbar from the Headband by undoing the knobs.

Remove 3 off No2 x PT screws (19) holding the Dimmer Block to the

Browbar.

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.

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.

The Optics Head can now be separated from the Browbar.

Figure 1

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Remove the Front Cover

Remove 2 of

f Mirror Spindle Knob (25) by gently pulling.

Carefully lift 2 off Control Knob Label (21) with the point of a sharp blade.

They are self adhesive.

Remove 2 off M2 x 8 Csk PT Screws (32) from the centre of the 2 Control

Knobs.

Remove the 2 Control Knobs (

17).

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.

Remove 2 off M2 x 8 Csk PT Screws (Figure 3

13) from the top of the

unit above the Browbar Mount.

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.

Carefully remove the Light Shield (12).

Remove the Mirror Spindle (29).

Figure 2

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Remove the Optics Head and Illumination Assy.

Unscre

w 2 off Eye Cap (3) being careful not to lose the +2D Eye Lenses

(2).

Unscrew 2 off Eyepiece Lock Ring using TD351 Lock Ring Key.

Remove 2 off P D Slider (18)

Turn the unit over

Figure 3

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The Viewing Assy (27) and Illumination Assy (28) are joined by the Centre

Spindle (24) and must be removed together.

Remove 2 off M2 x 8 Csk PT Screws (13) from the Viewing Assy (27).

Remove 4 off M2 x 8 Csk PT Screws (13) from the Illumination Assy (13)

Carefully lift the 2 assemblies together from the Rear Cover Moulding (17)

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

Stand the Viewing Assy on its base.

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

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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