Nidek Medical MC-300 User manual

MULTI COLOR LASER PHOTOCOAGULATOR
Model MC-300
SERVICE MANUAL
March 2007
Pages in total: 136
XMC20*RDA001B/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 SAFETY PRECAUTIONS................................................................ 2-1
§3 TROUBLESHOOTING ..................................................................... 3-1
§4 SUBTROUBLESHOOTING ............................................................. 4-1
4.1 Power On Indicator does not Light Up. .....................................................................4-1
4.2 Cooling Device does not Start...................................................................................4-2
4.3 MC-300 does not Start. .............................................................................................4-3
4.4 An Interlock (INTLK) Number is Displayed. ............................................................... 4-4
4.4.1 INTLK 1.6 is displayed. ....................................................................................4-5
4.4.2 INTLK 2.7 is displayed. ....................................................................................4-6
4.4.3 INTLK 2.8 is displayed. ....................................................................................4-7
4.4.4 INTLK 3.2 is displayed. ....................................................................................4-8
4.4.5 INTLK 3.5 is displayed. ....................................................................................4-8
4.4.6 INTLK 4.5 is displayed. ....................................................................................4-9
4.4.7 INTLK 5.1 is displayed. ..................................................................................4-10
4.4.8 INTLK 6.3 is displayed. .................................................................................. 4-11
4.4.9 INTLK 9.9 is displayed. .................................................................................. 4-11
4.5 An Error (ERR) Number is Displayed. ....................................................................4-12
4.5.1 ERR 1 is displayed. .......................................................................................4-15
4.5.2 ERR 2 is displayed. .......................................................................................4-16
4.5.3 ERR 3 is displayed. .......................................................................................4-17
4.5.4 ERR 4 is displayed. .......................................................................................4-18
4.5.5 ERR 6 is displayed. .......................................................................................4-19
4.5.6 ERR 7 is displayed. .......................................................................................4-20
4.5.7 ERR 10 is displayed. .....................................................................................4-21
4.5.8 ERR 11 is displayed. .....................................................................................4-22
4.5.9 ERR 13 is displayed. .....................................................................................4-23
4.5.10 ERR 15 is displayed. ...................................................................................4-23
4.5.11 ERR 18 is displayed. ...................................................................................4-24
4.5.12 ERR 25 is displayed. ...................................................................................4-24
4.5.13 ERR 26 is displayed. ...................................................................................4-25
4.5.14 ERR 27 is displayed. ...................................................................................4-26
4.5.15 ERR 33 is displayed. ...................................................................................4-27
4.5.16 ERR 34 is displayed. ...................................................................................4-27
4.5.17 ERR 53 is displayed. ...................................................................................4-28
4.5.18 ERR 54 is displayed. ...................................................................................4-29
4.5.19 ERR 55 is displayed. ...................................................................................4-30

4.5.20 ERR 59 is displayed. ...................................................................................4-30
4.5.21 ERR 80 is displayed. ...................................................................................4-31
4.5.22 ERR 81 is displayed. ...................................................................................4-32
4.5.23 ERR 82 is displayed. ...................................................................................4-32
4.5.24 ERR 83 is displayed. ...................................................................................4-32
4.5.25 ERR 90 is displayed. ...................................................................................4-32
4.5.26 ERR 91 is displayed. ...................................................................................4-32
4.5.27 ERR 93 is displayed. ...................................................................................4-33
4.5.28 ERR 94 is displayed. ...................................................................................4-33
4.6 Each Setting of Control Box can not be Changed. .................................................4-33
4.7 Laser Beam is not Emitted. ....................................................................................4-34
4.8 Actual Output is out of Standards. ..........................................................................4-35
4.9 Emergency Off Switch does not Work.. .................................................................4-36
§5 REMOVING PROCEDURES........................................................... 5-1
5.1 Covers ......................................................................................................................5-1
5.1.1 Left cover.........................................................................................................5-1
5.1.2 Right cover ......................................................................................................5-1
5.1.3 Rear cover.......................................................................................................5-2
5.1.4 Fiber optic cable cover ....................................................................................5-2
5.1.5 Top cover .........................................................................................................5-3
5.1.6 Front cover ......................................................................................................5-3
5.2 Duct ..........................................................................................................................5-4
5.3 Shutter ASSY. Cover .................................................................................................5-4
5.4 Coagulation Shutter Cover ........................................................................................5-5
§6 REPLACEMENT PROCEDURES .................................................. 6-1
6.1 Control Box Connector Board ...................................................................................6-1
6.2 Compressor Fan ASSY. ............................................................................................6-1
6.3 Relay Board ..............................................................................................................6-2
6.4 Switching Power Supply ...........................................................................................6-2
6.5 LD Power Supply ......................................................................................................6-3
6.6 Motor Driver ..............................................................................................................6-3
6.6.1 C-motor driver ASSY........................................................................................6-3
6.6.2 A-motor driver ASSY. .......................................................................................6-3
6.7 Key Switch ASSY. .....................................................................................................6-4
6.8 Line Indicator ASSY. ..................................................................................................6-4
6.9 Front Panel ASSY. .....................................................................................................6-5
6.9.1 Channel switch ................................................................................................6-5
6.9.2 Foot switch connector .....................................................................................6-5
6.10 Delivery Unit ASSY. .................................................................................................6-6
6.11 Remote Connector ASSY. .......................................................................................6-6
6.12 Fuses ......................................................................................................................6-7
6.13 Master Switch .........................................................................................................6-7
6.14 Emergency Switch ASSY. .......................................................................................6-8
6.15 LD Driver Fan ASSY. 1 ............................................................................................6-8
6.16 LD Driver Fan ASSY. 2 ............................................................................................6-9
6.17 Fiber Switch ASSY. .................................................................................................6-9

6.18 Shutter ASSY. (Dual) .............................................................................................6-10
6.19 Coagulation Shutter ASSY. ....................................................................................6-10
6.20 Sensor and Solenoid of Coagulation Shutter ASSY. ............................................. 6-11
6.21 Interface Board ..................................................................................................... 6-11
6.22 Dual Shutter ASSY. ............................................................................................... 6-11
6.23 Cooling Device ......................................................................................................6-12
6.24 Master Board ........................................................................................................6-13
6.25 Laser Unit..............................................................................................................6-13
6.26 Water Filter ...........................................................................................................6-15
6.26.1 New type of water filter ................................................................................6-15
6.26.2 Old type of water filter ..................................................................................6-16
6.27 Controller of Cooling Device .................................................................................6-18
§ 7 ADJUSTMENT............................................................................... 7-1
7.1 Master Board Check .................................................................................................7-1
7.2 Relay Board Check ...................................................................................................7-1
7.3 Pulse Motor Driver ....................................................................................................7-1
7.4 EEPROM Initial Setting .............................................................................................7-2
7.5 Parameter Setting .....................................................................................................7-2
7.6 Service Mode Indications Display .............................................................................7-2
7.7 Supplying Cooling Water and Setting Flow Amount ..................................................7-3
7.8 Water Temperature Setting .......................................................................................7-3
7.9 Cooling Device Idling Time Measurement .................................................................7-3
7.10 Laser Power Output Adjustment .............................................................................7-4
7.11 Monitor Adjustment ..................................................................................................7-4
7.11.1 First monitor adjustment ................................................................................7-4
7.11.2 Second and third monitors adjustment..........................................................7-5
7.11.2.1 Adjustment in high power mode .......................................................7-5
7.11.2.2 Adjustment in low power mode ........................................................7-6
7.12 Current Signal Adjustment ......................................................................................7-6
7.13 Overpower and Underpower Adjustment ................................................................7-7
7.13.1 Overpower and underpower adjustment of second monitor .........................7-7
7.13.2 Overpower and underpower adjustment of third monitor .............................7-8
7.14 Aiming Monitor Origin Adjustment ...........................................................................7-9
7.15 Power Output Check ..............................................................................................7-9
7.16 Fiber Optic Cable Alignment .................................................................................7-10
7.17 Delivery Unit Coagulation Output Adjustment .......................................................7-10
7.18 Aiming Beam Output Adjustment .......................................................................... 7-11
7.19 LD Aiming Beam Output Adjustment .................................................................... 7-11
7.20 Coagulation Time Setting ......................................................................................7-12
7.21 Repeat Time Setting .............................................................................................7-12
7.22 Aiming Monitor Adjustment ....................................................................................7-13
7.23 Slit Lamp Delivery Unit Spot Size Adjustment .......................................................7-13
7.24 Peltier Driver Adjustment ......................................................................................7-14
7.25 3CH Temperature Control Board Adjustment .......................................................7-15
7.26 Cooling Water Flow Amount Check ......................................................................7-16
7.27 Parameter Update ................................................................................................7-16
7.28 Improving Contact Failure .....................................................................................7-16
7.29 Foot Switch Adjustment ........................................................................................7-17

§ 8 SUPPLEMENT ............................................................................... 8-1
8.1 Wiring Diagram .........................................................................................................8-1
8.2 Connector Cable .......................................................................................................8-2
8.3 All TPs and VRs on Master Board ..........................................................................8-29
8.3.1 Layout ............................................................................................................8-29
8.3.2 VR detail table ...............................................................................................8-30
8.3.3 TP detail table ................................................................................................8-31
8.4 Message Tables ......................................................................................................8-32
8.4.1 Interlock .........................................................................................................8-32
8.4.2 Error ..............................................................................................................8-32
8.5 Appearance .............................................................................................................8-33
8.5.1 Front view ......................................................................................................8-33
8.5.2 Side and rear view .........................................................................................8-34
8.5.3 Control box ....................................................................................................8-35
8.6 Labels .....................................................................................................................8-36
8.7 Parameter Tables ...................................................................................................8-39
8.7.1 Ver. 1.10 ........................................................................................................8-39
8.7.2 Difference between Ver. 1.10 and 1.00..........................................................8-43
8.8 DIP SW Table .........................................................................................................8-44
8.9 Necessary Tools .....................................................................................................8-44

XMC20*RDA001B/E
1 - 1
• This service manual is for the NIDEK MULTI COLOR LASER PHOTOCOAGULATOR,
MC-300.
• For correct service, 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 MC-300.
• Specifications are subject to change without notice for improvement. Refer to the Technical
Bulletin (T. B.) for important changes.
• In case the system cannot be repaired according to the procedures described in this
manual, please report the serial number of the system and details of the symptom or
symptoms.
§1 INTRODUCTION

XMC20*RDA001B/E
1 - 2

XMC20*RDA001B/E
2 - 1
<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.
• 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.
<Maintenance precautions>
• Take antistatic precautions when touching the electric pole of the laser head.
• If case of system malfunction, check the symptom and turn the power switch off.
• Never drop parts or screws inside the system, nor bump it against surrounding objects.
• Prepare storage cases so as not to lose the removed parts and screws.
• Tighten or loosen screws with proper tools.
• After loosening the screws fastened by a threadlocking adhesive, be sure to reapply the
threadlocking adhesive to the screws when retightening them.
• After replacing parts, make sure that they are fastened securely before turning on the
power.
• Should you observe strange odors or smoke being issued from the system, immediately
turn off the power switch, disconnect the power cord from the outlet, and investigate the
cause. If the system is powered in abnormal conditions, fire, electric shock, or total loss
of the system may result.
• The labeled area indicates high voltage. Take proper precautions against electric
shock.
• See Wiring Diagram and Connecting Cable for checking cable breaks as described in
“TROUBLESHOOTING”. In addition, check cables for the following:
(1) Connectors are connected and crimped properly.
(2) No contact failure occurs after re-connection of connectors.
(3) Cables are soldered properly.
Do not yank the cables with excessive force. Doing so could cause cable breakage.
Never perform servicing with wet hands. Doing so could cause electric shock or
malfunction.
• Never emit the laser beam onto a reflective surface such as metal or other.
• Be sure to wear the safety goggles specified for the MC-300 during laser emission.
• Never emit laser beam (direct beam) toward a human body or object.
<Adjustment precautions>
• After turning the main switch off, let the MC-300 sit for 5 minutes or more before turning
it on again.
• When the MC-300 is moved, let the system sit for 30 minutes or more before turning the
main switch on.
• Adjust the MC-300 on a vibration-free, level, and stable surface.
A slanted floor or place subject to vibration will obstruct accurate adjustment.
• Do not use adjustment jigs for purposes other than those intended.
§2 SAFETY PRECAUTIONS

XMC20*RDA001B/E
2 - 2

3 - 1
XMC20*RDA001B/E
§3 TROUBLESHOOTING
Turn the master switch on.
Does the power on indicator light up?
Does the cooling device start?
Do the LEDs on the control box light up?
Are the indications on the remote control normal
after countdown?
Can each setting of the control box be changed?
Does pressing the foot switch emit the laser
beam?
4.1 Power On Indicator does not Light Up.
4.2 Cooling Device does not Start.
4.4 An Interlock Number is Displayed.
4.5 An Error Number is Displayed.
4.6 Each Setting of Control Box can not be
Changed.
4.7 Laser Beam is not Emitted.
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
Does the actual output satisfy the standards?
Standards 90 mW or less: ±20%
100 mW or more: ±15%
4.8 Actual Output is out of Standards.
Yes
No
4.3 MC-300 does not Start.
No
Does the MC-300 have the ERR or INTLK
history?
4.4 An Interlock Number is Displayed.
4.5 An Error Number is Displayed.
No
Yes
Turn the key switch to the ON position.

3 - 2
XMC20*RDA001B/E
Turn the key switch to the OFF position.
Turn the master switch off.
End
Yes
4.9 Emergency Off Switch does not Work.
Does pressing the emergency off switch turn off
the laser, remote control, and compressor?
No

4 - 1
XMC20*RDA001B/E
4.1 Power On Indicator does not Light Up.
§4 SUBTROUBLESHOOTING
Replace the fuses (see 6.12).Are the fuses blown?
Is the voltage between the P1 3rd and 5th pins on
the switching power supply (17350-E004) inside
the front cover the same as the wall outlet
voltage? (Ex: 100 V AC)
Is the voltage between the P2 8th (24 V) and 4th
(GND) pins on the switching power supply DC +24
V?
Is the voltage between the P301 (J301) 1st and
2nd (GND) pins on the line indicator ASSY.
(17350-EA41) DC +24 V?
Replace the line indicator ASSY. (see 6.8).
Check the wirings of the master switch ASSY.
(17350-EA32) and transformer ASSY. (17350-
EA33).
Replace the DC output ASSY. (17350-EA45).
Yes
Yes
Yes
Yes
No
No
No
Check the fuses of the switching power supply
(17350-E004). When they are normal, replace the
switching power supply (see 6.4).
No

4 - 2
XMC20*RDA001B/E
4.2 Cooling Device does not Start.
Are the fuses on the relay board (17350-BA03)
blown?
Is the circuit breaker of the built-in cooling device
tripped?
Replace the fuses on the relay board (see 6.3).
Reset the circuit breaker.
If the breaker trips again, return the MC-300 to the
factory.
No
No
Yes
Yes
Is the voltage between the P312 (J312) 1st and
3rd pins on the relay board AC 100 V? Replace the relay board (see 6.3).
Yes
No
Connect the control box.Is the control box connected? No
Yes
Are there any breaks in the emergency cable
(17350-EA34)? Replace the emergency cable.
No
Yes
Does the continuity status between the P401 3rd
and 4th, and 5th and 6th pins on the emergency
switch ASSY. (17310-EA20) become as follows?
When it is pressed: Non-continuity
When it is released: Continuity
Replace the emergency switch ASSY.
(see 6.14).
Yes
No
Is P304 on the key switch ASSY. (17350-EA35)
as follows?
Key switch-on: Continuity between the 1st and
2nd, and 4th and 5th pins
Key switch-off: Continuity between the 1st and
3rd, and 4th and 6th pins
Replace the key switch ASSY. (see 6.7).
Yes
No
Is the key switch turned to the ON position before
the master switch is turned on? Turn the key switch to the OFF position.
No
Yes
Do the fans rotate?
Open the rear cover and set the cooling device
controller to display the water temperature.
Replace the compressor fan ASSY. (17350-EA37)
(see 6.2).
Yes
No

4 - 3
XMC20*RDA001B/E
4.3 MC-300 does not Start.
Turn the main switch off, wait for a while, and then
turn it on.
Do the controller and switches have any problem?
Replace the cooling device (17350-E001)
(see 6.23).
End
Yes
No
Do the orange and green indicators light up? Yes End
No
Is the voltage between the J123 3rd pin and
D_GND on the master board (17350-BA01) DC
+24 V when the key switch is turned to the ON
position?
Replace the master board (see 6.24).
Are there any breaks in the LD compressor off
ASSY. (17350-EA42)?
No
Yes
Is there continuity between the P304 1st and 2nd,
and 4th and 5th pins on the key switch ASSY.
(17350-EA35) when the key switch is turned to
the ON position?
Check the soldered spot. When in doubt, replace
the key switch ASSY. (see 6.7).
Yes
No
Is the flexible flat cable (17350-E520) connected
between J108 on the master board (17350-BA01)
and J302 on the control box connector board
(17350-BA03)?
Check the flexible flat cable. If there is no failure
in connection, replace it.
Yes
No
Replace the LD compressor off ASSY.
Replace the relay board (17350-BA03)
(see 6.3).
No
Yes

4 - 4
XMC20*RDA001B/E
4.4 An Interlock (INTLK) Number is Displayed.
4.4.1 INTLK 1.6 is displayed.
Is INTLK 1.6 (overheat of the LD power supply)
displayed?
Is INTLK 2.7 (excessive output) displayed?
Is INTLK 2.8 (excessive output - output motor/
monitor malfunction) displayed?
Is INTLK 3.2 (compressor/heater malfunction)
displayed?
Is INTLK 3.5 (overheat of the compressor)
displayed?
Is INTLK 4.5 (insufficient flow amount of the
cooling water) displayed?
Is INTLK 5.1 (excessive output of the aiming
beam) displayed?
Is INTLK 6.3 (remote interlock) displayed?
Is INTLK 9.9 (WDT error) displayed?
4.4.2 INTLK 2.7 is displayed.
4.4.3 INTLK 2.8 is displayed.
4.4.5 INTLK 3.5 is displayed.
4.4.6 INTLK 4.5 is displayed.
4.4.7 INTLK 5.1 is displayed.
4.4.8 INTLK 6.3 is displayed.
4.4.9 INTLK 9.9 is displayed.
Yes
No
End
4.4.4 INTLK 3.2 is displayed.
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No

4 - 5
XMC20*RDA001B/E
4.4.1 INTLK 1.6 is displayed.
Are there any breaks in the LD compressor off
ASSY. (17350-EA42)?
Does the voltage between the P313 1st pin and
GND on the relay board (17350-BA03) become
24 V when the countdown reaches 4 after the key
switch is turned to the ON position?
Is the voltage between the P313 (J313) 1st and
4th pins on the relay board AC 100 V?
Are there any breaks in the LD driver ASSY.
(17350-EA50)?
Does Fan 6 for the LD driver under the shutter
rotate when the countdown reaches 4?
Turn the key switch to the OFF position and
disconnect P119 from the master board (17350-
BA01). Is there continuity between the J119 2nd
and 8th pins ?
Replace the master board or return the MC-300 to
the factory.
Replace the relay board (see 6.3).
Replace the LD driver ASSY.
Replace the LD power supply (17350-E005)
(see 6.5).
Yes
Yes
Yes
No
No
Yes
No
Yes
No
When there is a break in LD driver fan ASSY. 1
(17350-EA39), repair or replace it (see 6.15).
No
Do Fans 7 and 8 in the MC-300 underside rotate?
Yes
When there is a break in LD driver fan ASSY. 2
(17350-EA40), repair or replace it (see 6.16).
No
Operate it in ambient temperatures of 30ºC or
less, and turn the aiming beam off as much as
possible to shorten the operation time.
Is the MC-300 operated in high ambient
temperatures (30ºC or more) for a long time?
Yes
No
Replace the LD compressor off
ASSY.
Replace the relay board
(see 6.3).
Yes No

4 - 6
XMC20*RDA001B/E
4.4.2 INTLK 2.7 is displayed.
Disconnect the delivery connector, set the power
output to 500 mW, and press the STATUS switch
to select READY. Display d2 p, d3 p, and LDC
with the Reset switch and POWER knob.
Is the indication of the d3 p value 625 or more?
Disconnect the delivery connector, set the power
output of the control box to 500 mW, and select
READY. Connect TP3 (second monitor) and TP4
(third monitor) on the master board (17535-BA01)
to an oscilloscope, and trigger it when the voltage
of TP4 increases to a level of 1.25 (10 msec/div).
Are there any breaks in the coagulation
monitor ASSY. (17350-EA17)?
Yes
No
No
Set DIP SW 1. 2, 6, and 8 to the OFF position and
set parameter for Address 1 to 1.
Does INTLK 2.7 occur only when the output of the
laser GRN is set to low?
Does INTLK 2.8 appear whenever the STATUS
switch is pressed to go into READY?
Adjust the Peltier driver (see 7.24).
No
Yes
Yes
Repair the coagulation monitor ASSY.
(17350-EA17).
Yes
Does contact failure occur between the
P216 (J216) 1st or 2nd pin on the master
board (17535-BA01) and P215 (J215) on
the interface board (17350-BAB02)?
Are there any breaks in the monitor cable
ASSY. (17350-EA58)?
No
Replace the monitor cable ASSY.
(17350-EA58).
Yes
Does only the voltage of TP4 become 0.625 V or
more when the color is GRN, and become 1.25 V
or more when the color is YEL/RED?
Yes
Yes No
Adjust the second and third monitors,
and adjust overpower and underpower
(see 7.11.2 and 7.13).
No
Is the indication of the d1 p value less than the
values below?
GRN：750, YEL/RED：500
No
When the output is 510 mW and READY is set,
does the TP17 voltage become as below?
GRN：6.2 V, YEL/RED：4.3 V
Replace the LD power
supply (17350-E005)
(see 6.5).
Replace IC24 on the master
board (17350-BA01) and the
master board (see 6.24).
Yes No
Return the MC-300 to the factory.
Yes
No
Improve the contact failure (see 7.28).
Yes

4 - 7
XMC20*RDA001B/E
4.4.3 INTLK 2.8 is displayed.
Disconnect the delivery connector, set the power
output to 500 mW and press the STATUS switch
to select READY. Display d2 p, d3 p, and LDC
with the Reset switch and POWER knob.
Is the indication of the d3 p value 625 or more?
Disconnect the delivery connector, set the power
output of the control box to 500 mW and select
READY. Connect TP3 (second monitor) and TP4
(third monitor) on the master board (17535-BA01)
to an oscilloscope, and trigger it when the voltage
of TP4 increases to a level of 1.25 (10 msec/div).
Are there any breaks in the coagulation
monitor ASSY. (17350-EA17)?
Yes
No
No
Turn Dip SW 1, 2, 6, and 8 to the OFF position,
and set parameter for Address 1 to 1.
Does INTLK 2.7 occur only when the output of the
laser GRN is set to low?
Does INTLK 2.8 appear whenever the STATUS
switch is pressed to select READY?
Adjust the Peltier driver (see 7.24).
No
Yes
Yes
Repair the coagulation monitor ASSY.
(17350-EA17).
Yes
Does contact failure occur between P216
(J216) 1st or 2nd pin on the master board
(17535-BA01) and P215 (J215) on the
interface board (17350-BAB02)?
Are there any breaks in the monitor cable
ASSY. (17350-EA58)?
No
Replace the monitor cable ASSY.
(17350-EA58).
Yes
Does only the voltage of TP4 become 0.625 V or
more when the color is GRN, and become 1.25 V
or more when the color is YEL/RED?
Yes
Yes No
Adjust the second and third monitors,
and adjust overpower and underpower
(see 7.11.2 and 7.13).
No
Is the indication of the d1 p value less than the
values below?
GRN: 750, YEL/RED: 500
No
When the output is set to 510 mW and READY is
set, the TP17 voltage become as below?
GRN: 6.2V, YEL/RED: 4.3V
Replace the LD power
supply (17350-E005)
(see 6.5).
Replace IC24 on the master
board (17350-BA01) and the
master board (see 6.24).
Yes No
Return the MC-300 to the factory.
Yes
No
Solve the contact failure (see 7.28).
Yes

4 - 8
XMC20*RDA001B/E
4.4.4 INTLK 3.2 is displayed.
4.4.5 INTLK 3.5 is displayed.
Check the compressor error ASSY. (17350-EA52). Turn the master switch off. In five minutes,
turn it on. If the symptom occurs, return the MC-300 to the factory.
Replace the compressor error ASSY. (17350-
EA52).
Are there any breaks in the compressor error
ASSY. (17350-EA52)?
Replace the master board
(see 6.24).
Yes
No
Turn the master switch off. In five minutes, turn it
on again. In another five minutes, check the
difference becomes within ±2ºC. If the symptom is
not improved, return the cooling device or the MC-
300 to the factory.
Remove the rear cover. Is the difference between
the upper-row (setting) and lower-row (actual
temperature) indications 5℃or more?
Yes
No
Replace the cooling device (17350-E001).
(see 6.23).
Is the voltage between the J107 2nd pin and
D_GND on the master board (17350-BA01) 1 V or
less?
No
Yes
Connect the cables again and clamp them more
securely. Is the symptom improved? End
Yes
No
Replace the cooling device or the controller of the
cooling device (see 6.23).
Is the serial number 30123 or earlier and the
temperature controller of the cooling device is
manufactured by OMRON?
No
Yes