Nidek Medical CP-690 User manual

1\.
NIDEK
AUTOMATIC CHART PROJECTOR
Model CP-690
SERVICE MANUAL
D. NIDEK CO.,LTD.
MCP7**RDAOOlAlE
Total Page 63

§1
§2
§3
§4
§5
I'
Table of Contents
I'
Page
INTRODUCTION •••••••••....•..............................................................••..••••••••••••...••••••••.•1-1
CAUTIONS ............................•..•.•..•.•.••••••...••...•••••••.••....•...•.................•.......................•2-1
TROUBLESHOOTING ...............•.......•..•.•..•..•.•.••....•......••••.••....•.......••.........•..•.••.......3-1
SUB TROUBLESHOOTING ..........................................•.........••••..••.••••••••••••••••••••••.••4-1
4.1 The Initialization does not Start......................................................................•.........4-1
4.2 The Motor does notWork.........................................................................................4-2
4.3 The Motors do not Stop............................................................................................4-3
4.4 The Projection Lamp does not Go On......................................................................4-4
4.5 The Chart Image is Partly Blocked.....................................................................•.....4-5
4.6 The Chart Brightness is Unsuitable..........................................................................4-6
4.7 The Chart Brightness is Uneven...............................................................................4-8
4.8 The Chart Image is not Clear..............................
~ .....................................................4-9
4.9 The Chart Image does not Change as Operated
by the Remote Control. ...............4-10
4.10 The Polarized Chart does notDisappear...............................................................4-11
4.11 The LED does not Go On.........................................•...........................................4-12
REPLACEMENT .........................................................................................................5-1
5.1 Howto Remove the Covers ........,............................................................................. 5-1
5.2 Replacement of the Circuit Boards...........................................................................5-3
5.2.1 Replacement-ofthe BAOI board......................................................................5-3
5.2.2 Replacement
of the BA02 board......................................................................5-4
5.3 Replacement
of the Sensors......................................................................................5-5
5.3.1 Replacement
of the chart sensor......................................................................5-5
5.3.2 Replacement
of the mask sensor......................................................................5-6
5.4 Replacement
of the Chart Motor............•..................................................................5-7
5.5 Replacement
of the ChartAS~Y ..............................................................................5-9
5.6 Replacement of the MaskMotorand MaskASSY...........:.....................................5-11
5.7 Replacement
of the Bottom Cover ASSY (power LED)........................................5-13
5.8 Replacement
of the Power Switch ..........................................................................5-13
5.9 Replacement
of the Power Transformer .................................................................5-14
I

Page
5.10 R~placement of the C lens ASSY, Lamp Cable and Reflecting Mirror ...............5-15
5.11 Replacement of the Holder ASSY ........................................................................5-17
5.12 Replacement of the Halogen Lamp.......................................................................5-18
5.13 Replacement of the Fuses .....................................................................................5-18
5.14 Cleaning ................................................................................................................5-19
5.14.1 Cleaning
of the chart and mask....................................................................5-19
5.14.2 Cleaning
of the halogen lamp, reflecting mirror and condenser lens ..........5-20
5.14.3 Cleaning of the holder ASSY ......................................................................5-21
§6
ADJUSTEMENT .....••.....................................................................•••••••••••...................6-1
6.1 Adjustment of the Initialized Position...................................................................... 6-1
6.2 Adjustment of the Sensor Voltage............................................................................6-2
6.3 Adjustment
of the Lamp FilamentPosition................;...;.........................................6-3
6.4 Adjustment
of the Fixed MaskPosition....................................................•...............6-4
6.5 Adjustment
of the Chart and MaskPositions ...........................................................6-5
6.6 Setting..............................:........................................................................................6-6
6.6.1 Setting
of the voltage sensor............................................................................6-6
6.6.2 To display
or not display the visual acuity......................................................6-7
6.6.3 Selecting the amount
of chart light..................................................................6-8
6.6.4 Setting
of the beep sound volume (Response sound) ......................................6-8
6.6.5 Setting
of the DIP switch.................................................................................6-9
§7 INFORMATION..................................................................:.••••.••.....................•.••.......7-1
§8
§9
7.1 Wiring Diagram ............................................. '" ........................................................ 7-1
7.2 How to Carry Outthe Wiring .................................................................•.................7-5
LIST OF REPLACEABLE PARTS ...................................••••••....................••••••••••....8-1
TOOLS AND MEASURINGDEVICES .................................•••••••••.••••••.•.............••••9-1
II

R-, INTRODUCTION
:Y1.
This service manual provides information for after-sales service of the NIDEK Automatic Chart
Projector Model CP-690.
For proper after-sales service, it is necessary to understand this manual thoroughly before
servicing.
Refer to "CP-690 Operator's manual".
Specifications are subject to change without notice for improvement. As for important changes,
refer to Technical Bulletins;
In case the instrument cannot be repaired by procedures described in this manual, please tell us
the serial number
ofthe instrument and details of the symptom or symptoms.

R,.., CAUTIONS
:y~.
<Before service>
• Only service personnel, who are used to handling tools and are familiar with this instrument,
can perform the servicing.
• Perform the servicing according to the procedures described in this manual. If not, an
unexpected accident or a failure may be caused.
• Before maintenance, unless "Turn the power switch ON" is written, be sure to tum the power
switch OFF and unplug the power cord from the wall outlet.
• Pay attention notto perform the servicing with moist hands. This may cause an electric shock
or a failure.
<During service>
• If a malfunction occurs, check the symptom and tum the power switCh OFF.
• Once the lamp goes on, its surroundings become hot. Do not touch parts near the lamp while
it is litor
just after the light goes off.
• When handling circuit boards, be sure to touch only parts indicated in this manual. If not, an
electric shock ora failure may be caused.
• In case the ·instrument produces smoke or an unusual odor, turn the power switch OFF
immediately and then unplug the power cord from the wall outlet.
Do not use the instrument in abnormal conditions. This may cause an electric shock or a fire.
• Do notlose or drop the screws, parts, etc. inside the instrument.
As for the parts which are easy to lose, prepare a case beforehand and store the parts in it.
• If the screws, to which a threadlocking adhesive has been applied, are loosened, apply a
threadlocking adhesive to the screws after re-tightening them.
• The following words are used in §4 SUB TROUBLESHOOTING.
-Power voltage check-
CD Plug the power cord and turn the power switch ON.
@ Measure the voltage of the confirmed points with a tester (selecting voltage).
-Continuity check -
CD Tum the power switch OFF and unplug the power cord.
@ Measure the resistance of the confirmed points with the tester (selecting resistance).
-Cable check (Check
of poor contact) -
CD Turn the power switch OFF and unplug the powercord.
@ Check thatthe connectors are inserted correctly. (Refer to §7 WIRINGDIAGRAM.)
@ Reconnect the connectors and then check that there are no poor contacts in the connectors.
@ Measure the resistance of the confirmed points in a broken cable with the tester (selecting
resistance).

.
§3
TROUBLESHOOTING
•
Tum the power switch ON.
J
Does the LED next to the power switch 00 to 4.11.
goon?
""/
N
Jy
Does the initialization*1 start? Do both chart and mask
00 to 4.1.
(Do the motors rotate?) N
""/
motors work? y
I ,
00 to 4.2.
y N
Does the initialization finish? ,
00 to 4.3.
(D.o the motors stop?) N -
Jy
Does the projection lamp go on?
00 to 4.4.
N---
Y
,I,
After initialization, is the first projected ,
00 to 4.5.
chart image blocked by a mask? Y
0'
N
\
Is the chart brightuess suitable?
00 to 4.6.
"0
N
Y
Is the chart brightness even?
00 to 4.7.
---
N
1y

.3-2
lY
Is the chart image clear? Go to 4.8.
N
ly
Does the chart image change as operated , Go to 4.9.
by the remote control? N
~Y
Are there any charts blocked by the
mask? Y
IN
Does the charttilt againstthe mask? Make fine adjustments of the chart
Y and mask ASSYs.
~N
(Refer to 6.5.)
When looking at the polarized chart , Go to 4.10.
with polarizing glasses, does the chart N
image disappear?
~Y
Is the volume
of
the beep sound , Adjust the volume
of the beep sound
(response sound) appropriate? N (response sound).
~Y
(Refer to 6.6.4.)
End
*1 The initialization performs the following operations.
1) The chart ASSY rotates and then stops bythe sensor.
2) The chart ASSY moves little by little to correct its position.
3) The maskASSY rotates and then stops bythe sensor.
4) The mask ASSY moves little by little to correct its pqsition.
5) The projectionlamp goes on. The first chart is presented.

§4
SUB TROUBLESHOOTING
•
4.1 The Initialization does not Start.
Are the fuses blown? Replace the fuses.
y/ (Referto 5.13.)
IN
Is the working voltage ±! 0 % of the Use another wall outlet or a voltage
rating voltage? N regulator.
ly
Is the setting of the voltage selector N .Set the voltage selector again.
correct? (Refer to 6.6.1.)
ly
.
Does the power cord have continuity? , Replace the power cord.
N
JY
Does the power switch have continuity? Replace the power switch.
(Before checking the continuity, unplug N / (Refer to 5.8.)
the power cord from the wall outlet and
tum the power switch ON and OFF.)
(Refer to 7.1.)
ly
Is the voltage between the 1st and 3rd , Replace the transformer.
pins
of the PI connector AC 15.6 V N (Referto 5.9.)
±5 %? (Before measuring the voltage,
disconnect the
P! connector from the
circuit board.)
ly
.
Replace the BAO! board.
(Refer to 5.2.1.)

.4-2
4.2 The Motor does not Work.
When interchanging the connector , Replace the BAOI board.
positions
of the chart and mask motors, y (Refer to 5.2.1.)
does the working motor change?
IN
Replace the motor that does not work.
As for the chartmotor, refer to 5.4.
As for the mask motor, refer to 5.6.

.4-3
4.3 The Motors do not Stop.
Do the J4 and J6 connectors on the Reconnect the connectors.
BAOl board have poor contact? Y
~N
Is each voltage between TP1 and TP3
Adjust the voltage of each sensor.
(of the chart motor) and between TP2 N (Referto 6.2.)
and
TP3 (of the mask motor) on the Is the problem corrected?
BAOl board as follows?
When the shading plate blocks the N
~Y
light, ....................... +4.5 to 5 V
When the shading plate does not End
block the light,
......... under +0.5 V
ly
Replace the sensor whose motor does
not stop
..
Replace the BAO 1board. As for the chart sensor, refer to 5.3.1.
(Refer to 5.2.1.) As for the mask sensor, refer to 5.3.2.
Is the problem corrected?
N
~Y
End
\11
Replace the BAOI board.
(Refer to 5.2.1.)
~