Nidek Medical LT-980 User manual
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Table of Contents
1. INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
2. SAFETY PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
3. SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
4. TROUBLESHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
5. SUBTROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . .15
5 . 1 LT-980 does not Start Properly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5 . 1 . 1 Fan is not rotating. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5 . 1 . 2 Initialization is not conducted properly . . . . . . . . . . . . . . . . . . . . . . . . 18
5 . 1 . 2 . 1 Indicator does not illuminate . . . . . . . . . . . . . . . . . . . . . . . . 19
5 . 1 . 3 Error occurs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
5 . 1 . 3 . 1 ERROR2: No trace data . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
5 . 1 . 3 . 2 ERROR17: Stylus came off (lower) . . . . . . . . . . . . . . . . . . . 20
5 . 1 . 3 . 3 ERROR19: Trace cancel . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
5 . 1 . 3 . 4 ERROR20: H-axis encoder error. . . . . . . . . . . . . . . . . . . . . 21
5 . 1 . 3 . 5 ERROR21: No frame. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
5 . 1 . 3 . 6 ERROR22: No pattern. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
5 . 1 . 3 . 7 ERROR23: Frame moved during tracing. . . . . . . . . . . . . . . 21
5 . 1 . 3 . 8 ERROR26: Pattern trace Z-axis move error . . . . . . . . . . . . 22
5 . 1 . 3 . 9 ERROR48: Stylus came off (upper) . . . . . . . . . . . . . . . . . . 22
5 . 1 . 3 . 10 ERROR49: Trace radii error . . . . . . . . . . . . . . . . . . . . . . . . 23
5 . 1 . 3 . 11 ERROR50: Pattern trace H-axis encoder limit over . . . . . . 23
5 . 1 . 3 . 12 ERROR51: V-axis encoder error. . . . . . . . . . . . . . . . . . . . . 24
5 . 1 . 3 . 13 ERROR52: Z data start and end points error . . . . . . . . . . . 24
5 . 1 . 3 . 14 ERROR53: Shape calculation error. . . . . . . . . . . . . . . . . . . 25
5 . 1 . 3 . 15 ERROR240: Calibration jig error . . . . . . . . . . . . . . . . . . . . . 25
5 . 1 . 3 . 16 ERROR1001 and later. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
5 . 2 Tracing cannot be Conducted Properly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
5 . 3 Trace Data is not Normal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
5 . 3 . 1 Frame trace data is not normal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
5 . 3 . 2 Pattern trace data is not normal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
5 . 4 Tracer Utility cannot be Connected. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
5 . 4 . 1 When RS-232C cable is connected . . . . . . . . . . . . . . . . . . . . . . . . . . 29
5 . 4 . 2 When USB cable is connected. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
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6. REMOVAL PROCEDURE . . . . . . . . . . . . . . . . . . . . . . . . . . .31
6 . 1 Top Cover ASSY (44801-2000) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
7. REPLACEMENT PROCEDURE . . . . . . . . . . . . . . . . . . . . . .33
7 . 1 ASSYs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
7 . 1 . 1 Tracer ASSY (40601-0010) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
7 . 1 . 2 Rear panel ASSY (44801-1100). . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
7 . 2 Boards. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
7 . 2 . 1 SW connection board (44801-BA02) . . . . . . . . . . . . . . . . . . . . . . . . . 36
7 . 2 . 2 USB board (44801-BA03) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
7 . 3 Electrical Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
7 . 3 . 1 Slow-blow fuse (80402-02039). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
7 . 3 . 2 Rocker switch (80460-00133) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
7 . 3 . 3 Switching power supply (44801-E012). . . . . . . . . . . . . . . . . . . . . . . . 40
7 . 3 . 4 Fuse holder (80401-00033) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
7 . 3 . 5 Switch sheet (44801-E030) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
7 . 4 Mechanical Parts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
7 . 4 . 1 Stylus ASSY (40601-7910) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
8. ADJUSTMENT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45
8 . 1 Using Tracer Utility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
8 . 1 . 1 Connecting and activating Tracer Utility. . . . . . . . . . . . . . . . . . . . . . . 45
8 . 1 . 2 Checking the error contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
8 . 1 . 3 Checking the parameter data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
8 . 1 . 4 Changing the parameter data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
8 . 2 Tracer Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
8 . 2 . 1 Full calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
8 . 2 . 2 Standard frame calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
8 . 2 . 3 Standard pattern calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
8 . 2 . 4 Stylus calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
8 . 3 Software Upgrade . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
8 . 3 . 1 Main body software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
9. SUPPLEMENT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .65
9 . 1 Appearance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
9 . 1 . 1 Top view . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
9 . 1 . 2 Rear view . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
9 . 2 Labels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
9 . 3 Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
9 . 4 Connector Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
9 . 5 Connectors and Switches on Boards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
9 . 5 . 1 Main board (40601-BA01) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
9 . 5 . 2 SW connection board (44801-BA02) . . . . . . . . . . . . . . . . . . . . . . . . . 72
9 . 5 . 3 USB board (44801-BA03) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
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9 . 6 Layout Drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
9 . 6 . 1 Boards (BA**) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
9 . 6 . 2 Electrical parts (E**/10 digits). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
9 . 7 Error Message List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
9 . 8 Jigs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
9 . 9 Adjustment List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
9 . 9 . 1 Adjustments after replacing ASSYs, boards, and electrical/ mechanical
parts78
9 . 10 Check sheet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
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1 INTRODUCTION
This Service Manual describes repair procedures of the NIDEK Satellite Tracer, LT-980.
To conduct repairs properly, thorough understanding of the contents in this manual is required
prior to the service.
Refer to the Operator’s Manual and Parts List for the LT-980.
In addition, refer to the Service Manual and Parts List for the tracer ASSY (LETR-1) which is built
in the LT-980.
In case the instrument cannot be repaired by the procedures described in this manual, please
report the serial number of the instrument and details of the symptom or symptoms.
Refer to the Service Manual Annex for important changes.
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2 SAFETY PRECAUTIONS
1 . Requirements for prior contact regarding repair
1 ) When conducting repairs described in the Service Manual or Service Manual Annex,
prior contact with NIDEK is not necessary.
2 ) When conducting repairs not covered in the Service Manual or Service Manual
Annex, prior contact with NIDEK in writing is required.
3 ) When for some reason, repairs were conducted because they needed to be done
immediately, or other such circumstance, contact NIDEK as soon as possible in writ-
ing after conducting repairs to the instrument.
2 . General precautions
1 ) Servicing must be performed by NIDEK service persons or other qualified personnel.
2 ) Observe the procedures described in this manual.
3 ) Never wipe the covers using an organic solvent such as paint thinner. Doing so may
ruin the surface and impair the appearance of the system.
4 ) When performing maintenance work, turn off the power switch and disconnect the
power cord from the wall outlet unless the power needs to be on.
3 . Cautions related to power supply and power cable
1 ) Disconnect the power cord by holding its plug. Do not place heavy objects on the cord
or coil the cord tightly. A damaged power cord may cause fire or electric shock.
2 ) Occasionally clean the prongs of the power plug with a dry cloth. If dust accumulates
between the prongs, the dust will collect moisture, and short circuit or fire may occur.
3 ) Insert the power plug into the wall outlet completely. A fire may occur if the tracer is
used with improper connection.
4 ) Do not overload the electrical outlet. A fire may occur.
5 ) Be sure to use an outlet equipped with a ground terminal. Electric shock may occur in
the event of malfunction or power leakage.
6 ) Be sure to use a wall outlet that meets the power requirements. If the line voltage is
too high or too low, the tracer may not perform properly. Electric shock, malfunction,
or fire may result.
4 . Maintenance cautions
1 ) Take antistatic precautions prior to repair.
2 ) Take proper care against electric shock during repair.
3 ) Tighten or loosen screws with proper tools.
4 ) Never drop parts or screws inside the system.
5 ) Prepare storage cases so as not to lose the removed screws or parts.
6 ) After loosening the screws fixed by a threadlocking adhesive, be sure to reapply the
threadlocking adhesive to the screws when retightening them.
7 ) After replacing parts, confirm that they are fastened in their original positions securely
before turning on the power.
8 ) See Wiring Diagram and Connecting Cable to check cable breaks as described in
TROUBLESHOOTING. In addition, check cables for the following:
a . Connectors are connected and crimped properly.
b . No contact failure occurs after re-connection of connectors.
c . Cables are soldered properly.
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* Do not yank the cables with excessive force. Doing so could cause cable break-
age.
* Never perform servicing with wet hands. Doing so could cause electric shock or
malfunction
9 ) The labeled area indicates high voltage. Take proper precautions against electric
shock.
10) When a cable with any of the following marks is disconnected and reconnected, be
sure to confirm that the screws are tightened securely.
a . Protective ground:
b . Functional ground:
c . Equipotential:
11 ) Install the device where the outlet which the power plug is inserted into is easily
accessible during use. In addition, ensure that the power plug can be disconnected
without the use of a tool.
Otherwise, it may interfere with disconnection of the device from the input power
source in case of abnormality.
5 . Adjustment precautions
1 ) Confirm that the following conditions are met before installation.
a . A place which is level and stable without vibration and shock
b . No exposure to direct sunlight or ultraviolet rays
c . A place with minimal external light sources
d . No exposure to water
e . A place where temperature and humidity meet the specifications for use
f . Dust-free and smoke-free
2 ) Never use the adjustment jigs for purposes other than those intended.
6 . Caution after repair
1 ) Confirm that the instrument operates properly after repair.
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3 SPECIFICATIONS
1 . Tracing unit
1 ) Automatic tracing Both eyes / single eye
2 ) Semiauto tracing Both eyes / single eye
3 ) Pattern tracing
2 . Measurement range
1 ) Frame tracing
a . Circumference Condition: To be measured with the standard frame of
which circumference is known
Error: ±0.05 mm
b . Axis accuracy Error: ±0.5°
c . Measurement range Shape width: 36 to 85 mm
Shape height: 18.4 to 66 mm
Frame horizontal width: 113 to 180 mm
Maximum height from clamp midpoint: 23 mm
* When the height is maximum
Vertical width: 50 mm max.
Frame horizontal width: 150 mm max.
d . Tracing performance A frame equivalent to 8 base curve can be measured.
e . Repeat accuracy Condition: To be measured with the standard frame of
which circumference is known (60 times continuous
tracing)
Error: ±0.05mm
2 ) Pattern tracing
a . Circumference Condition: To be measured with the standard pattern of
which circumference is known
Error: ±0.10 mm
b . Axis accuracy Error: ±1.0°
c . Measurement range 22 to 74 mm in diameter
* However, vertical range is 15.5 to 66 mm.
3 . Power requirements
1 ) Power source AC 100 to 120/230 V, 50/60 Hz
2 ) Power consumption 60 VA max.
4 . Dimensions and mass
1 ) Dimensions 315 mm (W) × 300 mm (D) × 155 mm (H)
2 ) Mass 7 kg or less
5 . Environmental conditions
1 ) During transport/storage
a . Temperature -20 to 70°C
b . Humidity 10 to 85% (non-condensing)
2 ) During use
a . Temperature 5 to 40°C
b . Humidity 30 to 80% in the range of 5 to 31°C
31 to 40°C (The minimum acceptable relative humidity
is 30%. The maximum acceptable relative humidity is
80% for temperatures up to 31°C which decreases lin-
early to 50% at 40°C.)
3 ) Altitude 2,000 m or less
4 ) Installation place Interior
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4 TROUBLESHOOTING
Turn on the power switch.
Does the LT-980 start properly?
No
5.1 LT-980 does not Start Properly (p15)
Yes
Is tracing conducted properly?
No
5.2 Tracing cannot be Conducted Properly (p26)
Yes
Is the trace data normal?
No
5.3 Trace Data is not Normal (p27)
Yes
Can Tracer Utility be connected?
No
5.4 Tracer Utility cannot be Connected (p29)
Yes
End
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5 SUBTROUBLESHOOTING
5.1 LT-980 does not Start Properly
Is the fan rotating?
No
5.1.1 Fan is not rotating (p16)
Yes
Do three short beeps sound?
Yes
5.1.3 Error occurs (p20)
No
Do four short beeps sound and all indicators above
the tracing buttons blink?
No
Replace the tracer ASSY (40601-0010) (see 7.1.1
[p33]).
Yes
5.1.2 Initialization is not conducted properly (p18)
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5.1.1 Fan is not rotating
Turn off the power switch.
Is the power supply voltage proper?
(100 V / 200 V ±10%)
No
Set a voltage regulator.
Yes
Are the slow-blow fuses (80402-02039) blown?
Yes
Replace the slow-blow fuses (80402-02039) (see
7.3.1 [p38]).
No
Are there any breaks in the power cord of the LT-
980 (see 9.3 [p69] and 9.4 [p70])?
Yes
Replace the power cord of the LT-980.
No
Remove the cover ASSY (44801-2000) (see 6.1
[p31]).
Are there any breaks in the cable ASSY (44801-
CA01) (see 9.3 [p69] and 9.4 [p70])?
Yes
Replace the cable ASSY (44801-CA01).
No
Are there any breaks in the cable ASSY (44801-
CA03) (see 9.3 [p69] and 9.4 [p70])?
Yes
Replace the cable ASSY (44801-CA03).
No
Are there any breaks in the cable ASSY (44801-
CA04) (see 9.3 [p69] and 9.4 [p70])?
Yes
Replace the cable ASSY (44801-CA04).
No
Are there any breaks in the cable ASSY (41971-
CA07) (see 9.3 [p69] and 9.4 [p70])?
Yes
Replace the cable ASSY (41971-CA07).
No
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5.1.2 Initialization is not conducted properly
The indicator above blinks during initialization.
When initialization is complete properly, the indicator above illuminates.
Does the indicator above the button illuminate?
No
5.1.2.1 Indicator does not illuminate (p19)
Yes
Turn off the power switch.
Remove the top cover ASSY (44801-2000) (see
6.1 [p31]).
Are there any breaks in the cable ASSY (44801-
CA04) (see 9.3 [p69] and 9.4 [p70])?
Yes
Replace the cable ASSY (44801-CA04).
No
Are the DIP SWs on the main board (40601-BA01)
set properly (see 9.5.1 [p72])?
No
Set the DIP SWs on the main board (40601-BA01)
properly.
Yes
Replace the tracer ASSY (40601-0010) (see 7.1.1
[p33]).
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5.1.2.1 Indicator does not illuminate
Is initialization conducted properly?
Yes
Replace the switch sheet (44801-E030) (see 7.3.5
[p42]).
No
Turn off the power switch.
Remove the top cover ASSY (44801-2000) (see
6.1 [p31]).
Are there any breaks in the cable ASSY (41971-
CA06) (see 9.3 [p69] and 9.4 [p70])?
Yes
Replace the cable ASSY(41971-CA06).
No
Replace the SW connection board (44801--BA02)
(see 7.2.1 [p36]).
Are there any breaks in the cable ASSY (44801-
CA04) (see 9.3 [p69] and 9.4 [p70])?
Yes
Replace the cable ASSY(44801-CA04).
No
Replace the tracer ASSY (40601-0010) (see 7.1.1
[p33]).
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5.1.3 Error occurs
5.1.3.1 ERROR2: No trace data
Conduct tracing again.
5.1.3.2 ERROR17: Stylus came off (lower)
The LT-980 is not equipped with error display function.
Use the Error History display function of Tracer Utility to confirm error contents (see 8.1.2
[p47]).
ERROR20, ERROR51, and ERROR1000 and later occur when the tracer ASSY (40601-
0010) is defective.
Replace the tracer ASSY (40601-0010) (see 7.1.1 [p33]).
When repairing the tracer ASSY (40601-0010), refer to the service manual for the tracer
ASSY (LETR-1).
Is the trace position beyond the traceable range?
Yes
Set the frame in the center and conduct tracing
again.
No
Conduct goggle type frame tracing.
Is frame tracing conducted although a pattern is
set?
Yes
Replace the tracer ASSY (40601-0010) (see 7.1.1
[p33]).
No
Check the calibration data (refer to the service
manual for the LETR-1).
Is the calibration data normal (refer to the service
manual for the LETR-1)?
No
Conduct full calibration (see 8.2.1 [p52]).
Yes
Replace the tracer ASSY (40601-0010) (see 7.1.1
[p33]).
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