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CHART PROJECTOR

Model

CP-770

SERVICE MANUAL

September 2007

Pages in total: 64

MCP8**RDA001A/E

Summary of Contents for CP-770

Page 1: ...CHART PROJECTOR Model CP 770 SERVICE MANUAL September 2007 Pages in total 64 MCP8 RDA001A E...

Page 2: ...Tokyo Office Bunkyo Ku Tokyo 113 0033 Japan Telephone 81 3 5844 2641 Facsimile 81 3 5844 2642 NIDEK INCORPORATED 47651 Westinghouse Drive Fremont California 94539 U S A United States Agent Telephone...

Page 3: ...ayed 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 d...

Page 4: ...ial 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...

Page 5: ...efore 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 pro...

Page 6: ...MCP8 RDA001A 1 2 This page is intentionally left blank...

Page 7: ...hen 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...

Page 8: ...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 descr...

Page 9: ...d 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...

Page 10: ...3 2 MCP8 RDA001A E This page is intentionally left blank...

Page 11: ...03 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 3480...

Page 12: ...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...

Page 13: ...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 Rep...

Page 14: ...n 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 BA0...

Page 15: ...tion 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 Repl...

Page 16: ...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...

Page 17: ...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...

Page 18: ...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...

Page 19: ...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...

Page 20: ...n the rear lens ASSY 34801 1311 or the front lens ASSY 34801 1312 Adjust the LED ASSY 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 fr...

Page 21: ...polarizing glasses are used as the check tool for subjects and the polarizing glasses are reversed left and right is the appearance of the polarized chart changed Replace the chart ASSY See 6 1 6 2 A...

Page 22: ...4 12 MCP8 RDA001A E This page is intentionally left blank...

Page 23: ...direction of the arrow while holding up the rear part of the front cover ASSY 3 Reassemble the removed parts in reverse order 5 2 Removing the Front Cover 1 Remove the upper cover ASSY 34801 1520 See...

Page 24: ...10 See 5 2 3 Unscrew BS3 x 6 n 5 and remove the bottom cover 34801 M153 4 Reassemble the removed parts in reverse order 5 4 Removing the Disc Cover 1 Remove the upper cover ASSY 34801 1520 See 5 1 2 U...

Page 25: ...d parts in reverse order 5 Adjust the LED ASSY position See 7 4 6 Adjust the fixed mask position See 7 5 2 6 1 2 Replacing the C lens ASSY Replacement part 34801 1201 1 Remove the illumination ASSY Se...

Page 26: ...e 7 11 6 1 4 Replacing the rear lens ASSY Replacement part 34801 1311 1 Remove the zooming lens ASSY 34801 1310 See 6 1 3 2 Unscrew the adjustment screw 34801 M097 and remove the rear lens ASSY 34801...

Page 27: ...and 3PW3 n 4 and remove the motor ASSY 34801 1610 with the mask ASSY The mask ASSY to be used depends on the chart type 1 Type M T PhM Mask ASSY 34801 1100 2 Type G Mask ASSY 34801 1110 3 Type UK Mask...

Page 28: ...nscrew SB3 x 6 n 4 SW3 n 4 and 3PW3 n 4 remove the motor ASSY 34801 1610 with the chart ASSY The chart ASSY to be used depends on the chart type 1 Chart M ASSY 34801 1420 2 Chart UK ASSY 34801 1430 3...

Page 29: ...cover See 5 1 and 5 2 2 Disconnect the all connectors on the main board 34801 BA01 3 Unscrew BS3 x 6 n 4 and replace the main board 34801 BA01 4 Reassemble the removed parts in reverse order Be sure...

Page 30: ...nlet 80457 00085 of the inlet ASSY 34801 1600 3 Unscrew BS3 x 6 n 2 and remove the switch cable 34801 EA01 and switch bracket 34801 M016 4 Remove the primary cable 34801 EA03 from the seesaw switch 80...

Page 31: ...er 6 3 3 Replacing the chart LED Replacement part 34801 EA07 1 Remove the cover See 5 1 5 2 and 5 3 2 Disconnect the P2 J2 connector on the main board 34801 BA01 3 Unscrew PC2 6 x 6 n 4 and remove the...

Page 32: ...the disc sensor 34801 EA08 4 Reassemble the removed parts in reverse order 5 Adjust the initial position See 7 3 6 3 4 2 Replacing the chart disc sensor Replacement part 34801 EA08 1 Remove the cover...

Page 33: ...E001 3 Unscrew BS3 x 6 n 4 and replace the switching power supply for medical devices 34801 E001 4 Reassemble the removed parts in reverse order Be sure to attach the insulating sheet 34801 M046 6 5 R...

Page 34: ...6 10 MCP8 RDA001A E This page is intentionally left blank...

Page 35: ...n the system power 3 After initialization is finished press any of the center left or right of SW3 on the main board 4 Three digit number of the version is displayed on the LED board For example Ver 1...

Page 36: ...m 0 5 m 1 0 m 1 5 m 2 0 m SW7 1 2 3 4 5 6 7 8 9 Chart brightness Standard Dark Bright Remote control code Rotary SW6 of main body Rotary SW of remote control 0 1st unit 0 0 1 2nd unit 1 1 2 3rd unit 2...

Page 37: ...s the horizontal line mask button so that a horizontal line is displayed 5 Adjust the chart to be horizontal to the mask 6 Select the astigmatism clock dial or the dots chart again Check that the uppe...

Page 38: ...s displayed on the paper as the right chart 6 Loosen TH3 x 5 n 2 and adjust the LED image by moving the LED ASSY 34801 1202 so that the image focuses on the lead wire of the chart LED 34801 EA07 7 Loo...

Page 39: ...ize to be same as the test scale size See 7 11 4 Loosen SB 3 x 6 n 4 and adjust the position of the mask motor ASSY 34801 1610 1 The position of the chart is at the center of the isolation when a sing...

Page 40: ...ounds When projecting the chart five meters away the center of the filter is within 3 mm from the center of the chart 3 Light leakage Projection to adjacent masks does not occur 5 Adjust the fixed mas...

Page 41: ...isplayed loosen SB3 x 6 n 2 and adjust the illumination ASSY 34801 1210 position 2 When shadows of the mask are projected on the chart circle while the astigmatism clock dial is displayed adjust the m...

Page 42: ...d loosen SB3 x 6 n 2 and adjust the illumination ASSY 34801 1210 position 3 If the illumination ASSY 34801 1210 position is adjusted check that shadows are not projected on the visual acuity values wh...

Page 43: ...When SW6 is set to 1 the LED display 1 3 When SW6 is set to 2 the LED display 2 4 When SW6 is set to 3 the LED display 3 5 When SW6 is set to 4 the LED display 4 6 When SW6 is set to 5 the LED displa...

Page 44: ...e main board 34801 BA01 12 Connect the jig to the communication part of the main body and check that the beep and the LED display become as follows 1 In normal beep once the LED display on the main bo...

Page 45: ...it with a tool such as a precision screwdriver as wiping the hole edge gently Be careful not to scratch the chart disc 8 Turn off the system power 9 Reassemble the removed parts in reverse order 2 Cle...

Page 46: ...3 x 6 and adjust the VA mask 34801 M029 position as the following description 1 Not to display the visual acuity values move the VA mask 34801 M029 to the right side and fasten BS3 x 6 2 To display th...

Page 47: ...se cover 2 Set the switch for the remote control code according to the main body as the following table 3 Check that the main body is operated by the remote control 4 Reattach the main body cover in r...

Page 48: ...on the main board to the value indicated on the table according to the setting distance The setting of the distance set according to the installation distance is the standard chart brightness 230 cd m...

Page 49: ...just the rear lens ASSY 34801 1311 so that the test scale of each refraction distance and the projected chart size are to be the same 3 Adjust the projected chart focus with the front lens ASSY 34801...

Page 50: ...ght and set the LED display to be the same value as the label that indicates the brightness Adjustment range F to A 9 to 9 A to F The center is 0 The chart is brighter as the adjustment value is large...

Page 51: ...8 1 MCP8 RDA001A E 8 INFORMATION 8 1 Wiring Diagram...

Page 52: ...8 2 MCP8 RDA001A E 8 2 Connector Cable 34801 EA01 34801 EA02 34801 EA03 34801 EA04...

Page 53: ...8 3 MCP8 RDA001A E 34801 EA06 34801 EA07 34801 EA08...

Page 54: ...8 4 MCP8 RDA001A E 34801 E004...

Page 55: ...8 5 MCP8 RDA001A E 8 3 View Main body Projection lens Remote control receiving window Pirot lamp Upper cover screw Table stand Optional Power switch RT communication connector Power inlet...

Page 56: ...rogram NEXT button Program BACK button Remote control transmitter Chart selection buttons 33 types Red green filtering button Single letter mask button Function button Sideward movement buttons Vertic...

Page 57: ...8 7 MCP8 RDA001A E 8 4 Label...

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