Nidek Medical CP-770 User manual

CHART PROJECTOR
Model CP-770
SERVICE MANUAL
September 2007
Pages in total: 64
MCP8**RDA001A/E

NIDEK CO., LTD. : 34-14, Maehama, Hiroishi-cho, Gamagori, Aichi 443-0038, Japan
(Manufacturer) Telephone: [phone]
Facsimile: (81-533) 67-6610
NIDEK CO., LTD : 3F Sumitomo Fudosan Hongo Bldg., 3-22-5, Hongo,
(Tokyo Office) Bunkyo-Ku, Tokyo 113-0033, Japan
Telephone: [phone]
Facsimile: (81-3) 5844-2642
NIDEK INCORPORATED : 47651 Westinghouse Drive, Fremont, California 94539, U. S. A.
(United States Agent) Telephone: [phone]
Facsimile: [phone]
NIDEK SOCIETE ANONYME : Europarc 13, rue Auguste Perret, 94042 CRETEIL, France
(EU Authorized Representative) Telephone: [phone]
Facsimile: (01) 49 80 32 08

Table of Contents
§ 1 INTRODUCTION ............................................................................ 1-1
§ 2 PRECAUTIONS ............................................................................. 2-1
§ 3 TROUBLESHOOTING ................................................................... 3-1
§ 4 SUBTROUBLESHOUTING ........................................................... 4-1
4.1 The Pilot Lamp does not Light Up. ............................................................................4-1
4.2 Initialization does not Finish Properly. .......................................................................4-2
4.2.1 The chart disc motor does not run. .................................................................4-3
4.2.2 The mask disc motor does not run. ................................................................4-3
4.2.3 The chart disc motor does not stop running properly. .....................................4-4
4.2.4 The mask disc motor does not stop running properly. ....................................4-4
4.2.5 The lamp does not light up. .............................................................................4-5
4.2.6 The VA 0.05 chart is not displayed. .................................................................4-5
4.3 The CP-770 cannot be Operated with the Remote Control. .....................................4-6
4.4 The Chart is not Displayed Properly by Operating the CP-770 with the
Remote Control. .......................................................................................................4-7
4.5 The Chat is Out of Focus. ........................................................................................4-8
4.6 The Chart Brightness is Inappropriate. .....................................................................4-9
4.7 The Chart Brightness is Uneven. ............................................................................ 4-10
4.8 The Chart does not Appear Properly When Looking at Polarized Chart through
the Polarizing Glasses. ........................................................................................... 4-11
4.9 The Beep Volume is Inappropriate. ......................................................................... 4-11
§ 5 REMOVING PROCEDURE ........................................................... 5-1
5.1 Removing the Upper Cover ......................................................................................5-1
5.2 Removing the Front Cover ........................................................................................5-1
5.3 Removing the Bottom Cover ....................................................................................5-2
5.4 Removing the Disc Cover .........................................................................................5-2
§ 6 REPLACEMENT ........................................................................... 6-1
6.1 Replacing Assemblies ..............................................................................................6-1
6.1.1 Replacing the illumination ASSY. .....................................................................6-1
6.1.2 Replacing the C lens ASSY. ............................................................................6-1
6.1.3 Replacing the zooming lens ASSY. .................................................................6-2
6.1.4 Replacing the rear lens ASSY.......................................................................... 6-2
6.1.5 Replacing the front lens ASSY. ........................................................................6-2
6.1.6 Replacing the motor ASSY. .............................................................................6-3

6.1.6.1 Replacing the mask motor ASSY. ...................................................... 6-3
6.1.6.2 Replacing the chart motor ASSY. .......................................................6-4
6.2 Replacing the Main Board .........................................................................................6-5
6.3 Replacing the Cable Assemblies ..............................................................................6-6
6.3.1 Replacing the switch cable .............................................................................6-6
6.3.2 Replacing the WR cable .................................................................................6-7
6.3.3 Replacing the chart LED .................................................................................6-7
6.3.4 Replacing the disc sensors .............................................................................6-8
6.3.4.1 Replacing the mask disc sensor .......................................................6-8
6.3.4.2 Replacing the chart disc sensor ........................................................6-8
6.4 Replacing the Switching Power Supply for Medical Devices....................................6-9
6.5 Replacing the Disc Motor ..........................................................................................6-9
§ 7 ADJUSTMENT............................................................................... 7-1
7.1 Checking the Version No. ..........................................................................................7-1
7.2 Setting SWs on the Main Board ................................................................................7-2
7.3 Adjusting the Initial Position with the Remote Control ...............................................7-3
7.4 Adjusting the LED ASSY. Position .............................................................................7-4
7.5 Adjusting the Mask Positions ....................................................................................7-5
7.5.1 Adjusting the mask ASSY. ................................................................................7-5
7.5.2 Adjusting the fixed mask position ....................................................................7-7
7.6 Self-Checking the Main Board...................................................................................7-9
7.7 Cleaning .................................................................................................................. 7-11
7.8 Displaying or Not Displaying the Visual Acuity Values ............................................7-12
7.9 Setting the Remote Control Channels .................................................................... 7-13
7.10 Setting the Refraction Distance and the Chart Brightness ...................................7-14
7.11 Setting the Chart Size and the Focus ...................................................................7-15
7.12 Setting the Brightness...........................................................................................7-16
§ 8 INFORMATION .............................................................................. 8-1
8.1 Wiring Diagram.........................................................................................................8-1
8.2 Connector Cable.......................................................................................................8-2
8.3 View ..........................................................................................................................8-5
8.4 Label .........................................................................................................................8-7
8.5 Replacement Parts List ............................................................................................8-8
8.6 Settings of the Switches ...........................................................................................8-9
8.7 Check of the Mask Positions ..................................................................................8-10
8.7.1 Type M ...........................................................................................................8-10
8.7.2 Type UK ......................................................................................................... 8-11
8.7.3 Type T ............................................................................................................8-12
8.7.4 Type PhM.......................................................................................................8-13
8.7.5 Type G ...........................................................................................................8-14

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MCP8**RDA001A/E
§1 INTRODUCTION
This service manual provides information for after-sales service of the Chart Projector
Model CP-770.
For proper service, be sure to understand this manual thoroughly before servicing.
Refer to the Chart Projector CP-770 Operator’s Manual and Parts List.
Refer to the Service Manual Annex for important changes.
In case the device can not be repaired according to the procedures described in this manual,
please report the serial number of the device and details of the symptom or symptoms.
Specifications in this manual are subject to change without notice for improvement.

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2 - 1
MCP8**RDA001A/E
§2 PRECAUTIONS
<General precautions>
• Servicing should be performed by NIDEK service persons or other qualified personnel.
• Perform all servicing according to the procedures described in this manual. Failure to do
so may cause unexpected accident or malfunction.
• During servicing, turn off the system power unless necessary and disconnect the power
code.
• Do not wipe the covers with organic solvents such as a thinner. The exterior might loss
the quality with the surface affected.
<Precautions during servicing>
• If malfunction occurs, check the symptom and turn the power off.
• Do not drop parts and screws inside the CP-770 and take care not to bump the CP-770.
• Prepare a case for storing the screws and parts in order not to lose them.
• Use a suitable tool to screw or unscrew a screw.
• When removing a screw where a threadlocking is applied, apply a threadlocking again
to the thread before tightening the screw.
• When replacing parts, check that all parts are secured in original positions before turning
the power on.
• If the CP-770 produces smoke or strange odors, immediately turn off the power and
disconnect the electrical plug from the outlet, and check the causes.
Using the system under such abnormal conditions may cause fire, electric shock and
complete malfunction.
• Be careful for electric shock where the electric shock mark is attached. The part is a
high voltage.
• In §3 TROUBLESHOOTING, when checking a break in a cable, also check the following
according to the wiring diagram and connector cable.
1. Proper connections and crimping
2. Proper contact by connecting and disconnecting connectors
3. Proper soldering
* Do not yank the cables with excessive force. Doing so could cause breakage.
* Do not perform servicing with wet hands. Doing so could cause electric shock or
malfunction.

MCP8**RDA001A/E
2 - 2
<Precautions for adjustment>
• Service at a stable and level surface free from vibration. Tilting or vibration can prevent
normal adjustment.
• Do not use the adjustment tools for other than the purpose described in this manual.

3 - 1
MCP8**RDA001A/E
§3 TROUBLESHOOTING
Turn the power on.
Does the pilot lamp light up?
Does initialization finish properly?
Can the CP-770 be operated with the remote
control?
Does the chart appear properly when looking at
the polarized chart through polarizing glasses?
Is the beep volume appropriate?
4.1 The Pilot Lamp does not Light up.
4.2 Initialization does not Finish Properly.
4.3 The CP-770 cannot be Operated with the
Remote Control.
4.8 The Chart does not Appear Properly when
Looking at the Polarized Chart through Polarizing
Glasses.
4.9 The Beep Volume is Inappropriate.
Turn the power off.
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
Is the chart displayed properly by operating the
CP-770 with the remote control?
4.4 The chart is not Displayed Properly by
Operating the CP-770 with the Remote Control.
No
Yes
Is the chart brightness appropriate? 4.6 The Chart Brightness is Inappropriate.
No
Yes
Is the chart brightness even? 4.7 The Chart Brightness is Uneven.
No
Yes
Is the chart in focus? 4.5 The Chart is Out of Focus.
No
Yes

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MCP8**RDA001A/E
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