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

1 - 1
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.

MCP8**RDA001A
1 - 2
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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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4 - 1
MCP8**RDA001A/E
§ 4 SUB-TROUBLESHOUTING
4.1 The Pilot Lamp does not Light Up.
Use an appropriate voltage outlet.Is the power voltage appropriate?
Are there any breaks in the cable switch (34801-
EA01)?
Are there any breaks in the primary cable (34801-
EA03)?
Is the voltage between the 1st and 3rd pins on the
TB2 connector of the switching power supply for
medical devices (34801-E001) DC + 12 V?
Replace the main board (34801-BA01).
Replace the cable switch (34801-EA01).
Replace the primary cable (34801-EA03).
Replace the switching power supply for medical
devices (34801-E001). (See 6.4.)
No
Yes
Yes
No
Yes
No
No
Yes
Are there any breaks in the secondary cable
(34801-EA04)? Replace the secondary cable (34801-EA04).
Yes
No

4 - 2
MCP8**RDA001A/E
4.2 Initialization does not Finish Properly.
4.2.1 The chart disc motor does not run.Does the chart disc motor run?
Does the chart disc motor stop running properly?
Completion
4.2.3 The chart disc motor does not stop running
properly.
No
Yes
No
Yes
4.2.2 The mask disc motor does not run.Does the mask disc motor run? No
Yes
Does the mask disc motor stop running properly? 4.2.4 The mask disc motor does not stop running
properly.
No
Yes
Does the lamp light up? 4.2.5 The lamp does not light up.
No
Yes
Is the VA 0.05 chart displayed? 4.2.6 The VA 0.05 chart is not displayed.
No
Yes

4 - 3
MCP8**RDA001A/E
4.2.1 The chart disc motor does not run.
4.2.2 The mask disc motor does not run.
Replace the chart motor ASSY. (34801-1610).
(See 6.1.6.2.)
Replace the main board (34801-BA01).
(See 6.2.)
No
YesAre there any breaks in the chart disc motor
(34801-E004)?
Replace the chart motor ASSY. (34801-1610).
(See 6.1.6.2.)
No
Yes
Is the symptom improved? Completion
Replace the mask motor ASSY. (34801-1610).
(See 6.1.6.1.)
Replace the main board (34801-BA01). (See 6.2.)
YesAre there any breaks in the mask disc motor for
mask (34801-E004)?
Replace the mask motor ASSY. (34801-1610).
(See 6.1.6.1)
No
Yes
Is the symptom improved? Completion
No

4 - 4
MCP8**RDA001A/E
4.2.3 The chart disc motor does not stop running properly.
4.2.4 The mask disc motor does not stop running properly.
Replace the main board (34801-BA01).
(See 6.2.)
When the P11 (J11) connector on the main board
(34801-BA01) is disconnected, is the voltage
between the 1st and 2nd pins of the J11
connector DC + 5 V?
The chart sensor (34801-EA08) is shaded, is the
voltage between TP7 and TP3 on the main board
(34801-BA01) as follows?
When shaded :DC + 4.0 V or higher
When not shaded :Lower than DC + 0.5 V
Replace the main board (34801-BA01).
(See 6.2.)
Yes
No
Yes
Replace the chart sensor (34801-EA08).
(See 6.3.4.2.)
No
Replace the main board (34801-BA01).
(See 6.2.)
Replace the main board (34801-BA01).
(See 6.2.)
When the P10 (J10) connector on the main board
(34801-BA01) is disconnected, is the voltage
between the 1st and 2nd pins of the J10
connector DC + 5 V?
The mask sensor (34801-EA08) is shaded, is the
voltage between TP6 and TP3 on the main board
(34801-BA01) as follows?
When shaded :DC + 4.0 V or higher
When not shaded :Lower than DC + 0.5 V
Yes
No
Yes
Replace the mask sensor (34801-EA08).
(See 6.3.4.2.)
No

4 - 5
MCP8**RDA001A/E
4.2.5 The lamp does not light up.
4.2.6 The VA 0.05 chart is not displayed.
Set the visual acuity values to be displayed or not
to be displayed. (See 7.8.)
Is the left on the chart chipping?
Adjust the initial position. (See 7.3.)
Is the symptom improved?
Is the chart partly blocked by the fixed mask?
Adjust the mask ASSY. position. (See 7.5.1.)
Completion
Adjust the fixed mask position. (See 7.5.2.)
Yes
No
Yes
No
Yes
No
Replace the chart LED (34801-EA07).
(See 6.3.3.)
Yes
Disconnect the P2 (J2) connector on the main
board (34801-BA01), and attach the new chart
LED (34801-EA07).
Does the chart LED (34801-EA07) light up? Replace the main board (34801-BA01)
(See 6.2.)
No

4 - 6
MCP8**RDA001A/E
4.3 The CP-770 cannot be Operated with the Remote Control.
Remove the obstruction.
Are there any obstructions between the remote
control and the receiving window of the main
body?
Do the channel settings of the remote control and
the main body match?
Are the batteries of the remote control dead?
Can the remote control be operated properly by
cutting off an ambient interference light?
Replace the remote control, and set the remote
control channel. (See 7.9.)
Is the symptom improved?
Completion
Match the channel settings of the remote control
and the main body.
(See 7.9.)
Replace the batteries.
Replace the main board (34801-BA01).
(See 6.2.)
Install the CP-770 away from windows and interior
spot lights.
No
Yes
Yes
No
Yes
No
Yes
No
No
Yes

4 - 7
MCP8**RDA001A/E
4.4 The Chart is not Displayed Properly by Operating the CP-770 with
the Remote Control.
Reattach the chart or the mask motor ASSY.
(34801-1610). (See 6.1.6.)
Are the screws fixed on the chart or mask motor
ASSY. (34801-1610) coming loose?
Is the chart ASSY. contacted with the mask
ASSY.?
Replace the main board (34801-BA01).
(See 6.2.)
Is the symptom improved?
Completion
Adjust the position of the chart and the mask
ASSY. (See 6.1.6.)
Replace the chart or mask motor ASSY. (34801-
1610). (See 6.1.6.)
No
Yes
Yes
No
Yes
No
Does the chart type of the remote control
correspond with the chart of the CP-770 main
body?
Use the remote control corresponding with the
chart of the CP-770 main body.
No
Yes
Is the chart or mask contacted with the disc house
(34801-M002)?
Adjust the position of the chart or the mask motor
ASSY. (34801-1610). (See 6.1.6.)
Yes
No
Set the chart type and No. 1 to No. 3 of SW2
correctly. (See 8.6.)
Are the chart type and No. 1 to No. 3 of SW2 set
correctly?
No
Yes

4 - 8
MCP8**RDA001A/E
4.5 The Chat is Out of Focus.
Install the main body on the position as described
in the standard.
Is the installation position of the main body as
specified?
Is the symptom improved?
Replace the screen.
Adjust the focus and the chart size. (See 7.11.)
Completion
Yes
No
No
Yes
Is there any dust on the chart ASSY.? Clean the chart ASSY. (See 7.7.)
Yes
No
Is there any dirt on the rear lens ASSY. (34801-
1311) or the front lens ASSY. (34801-1312)?
Clean the rear lens ASSY. (34801-1311) and the
front lens ASSY. (34801-1312)
Yes
No

4 - 9
MCP8**RDA001A/E
4.6 The Chart Brightness is Inappropriate.
Set SW5 on the main board (34801-BA01) to
correspond with the refraction distance.
(See 7.10.)
Does the SW5 setting on the main board (34801-
BA01) correspond with the refraction distance?
Does the SW7 setting on the main board (34801-
BA01) correspond with the setting distance?
Set SW7 on the main board (34801-BA01) to
correspond with the setting distance.
(See 7.10.)
No
No
Yes
Is there any dirt on the front lens (34801-1312)?
Is there any dirt on the chart ASSY.?
Clean the front lens (34801-1312). (See 7.7.)
Clean the chart ASSY. (See 7.7.)
Yes
No
Yes
No
Yes
Completion
Is there any dirt on the rear lens (34801-1311)? Clean the rear lens (34801-1311).
Yes
No

4 - 10
MCP8**RDA001A/E
Clean the chart ASSY. (See 7.7.)Is the brightness on the same chart irregular?
Is there any dirt on the lens of the C lens ASSY.
(34801-1201)?
Is there any dirt on the rear lens ASSY. (34801-
1311) or the front lens ASSY. (34801-1312)?
Adjust the LED ASSY. 䋨34801-1202) position.
(See 7.4.)
Clean the C lens ASSY.(34801-1201). (See 7.7.)
Clean the rear lens ASSY. (34801-1311) or the
front lens ASSY. (34801-1312). (See 7.7.)
Yes
No
Yes
No
Yes
No
Is there any dirt on the screen or is the screen
discolored? Replace the screen.
Yes
No
4.7 The Chart Brightness is Uneven.