MIG 275R & MIG 350R Service manual
Contents
1. Avoid electric shock by Wearing dry insulated boots Wearing dry leather gloves Working on a dry insulated floor where possible NOTE Under the terms of warranty welding torches and their consum are not The wa without approval of the man carried is void ables feed drive rol ers and feeder guide tubes covered Direct or indirect damage due to a defective product is not covered under the warranty ranty is void if chang es are made to the product ufacturer or if repairs are out using non approved spare parts The warranty Warranty Period if a non authorised agent carries out repairs The warranty is valid for 3 years from date of purchase provided the machine is used within the published specific ation limits Warranty Repairs Your service provider must be informed within the warranty period of any warranty defect The customer must provide proof of purchase and serial number of the equipment when making a wa ranty claim Warranty repairs may only be carried out by approved BOC service providers Please contact your local BOC Gas amp Gear for a directory of BOC approved service providers in your area Important Notice This document has been prepared by BOC Limited ABN 95 000 029 729 BOC as general information and does not contain and is not to be taken as containing any specific recommendation The document has been prepared in good fai2. Item Description Qty Material Part No BOC Part No 1 Polyester capacitor R 02 010400 14 00 02 010400 14 00 2 Polyester capacitor R 02 010403 01 0 02 010403 01 00 3 Toroidal transformer R 03 010303 24 0 03 010303 24 00 4 Current transformer 1 R 03 010400 05 00 03 010400 05 00 5 Reactor 1 R 03 020200 17 0 03 020200 17 01 6 Magnet ring 5 R 03 030200 04 00 03 030200 04 00 7 Rectifier module 2 R 04 010300 22 00 04 010300 22 00 8 LED luminous yellow 1 R 04 010700 17 0 04 010700 17 01 9 IGB R 04 050100 02 00 04 050100 02 00 10 3P rectifier bridge 04 QS 06100A1400V 04 QS 06100A1400V 11 Thermo switch R 06 030000 06 01 06 030000 06 01 12 Diffuser R 06 060000 11 00 06 060000 11 00 13 Circuit breaker R 07 070003 04 00 07 070003 04 00 14 Fuse tube 1 09 010000 05 00 09 010000 05 00 15 G350R control output panel 1 R 15 019790 01 A0 15 019790 01 A0 16 BOC host front plastic cover 1 15 900600 01 A0 15 900600 01 A 17 G350R rear panel 1 R 16 038092 01 A2 16 038092 01 A0 18 G200C 275C 275R 350R chassis 1 R 18 171000 01 A1 18 171000 01 A 19 BOC cylinder tray R 18 205000 01 A0 18 205000 01 A0 20 G 350R right side cover R 19 067269 04 A1 19 067269 04 A 21 G200C left side cover R 19 068222 01 A 19 068222 01 A0 22 G 350R left top side active cover R 19 069269 04 A 19 069269 04 A 23 Central board R 21 049200 01 A 21 049200 01 A0 24 Partition board 1 R 21 051200 01 A0 21 051200 01 A0 25 Rear axle 2 R 22 043001 01 A0 22 043001 01 A0 26 Control insulation
3. x cp3 e 10 XI 2 G ct cs c G jR IR4 IRS MRS 7 qu EN E d 5 4 3 A gt 2 EN EN EN FS 3 3 3 X6 a a 8 S VE 8 8 8 E 2 E 3 4 2 VEUC X4 K SRVI VEGO VEGO 3 D431 1 a JDIB E Roma 2 JD2B 4 7 8 9 n RRS RR4 RR3 RE2 RR1 RXI a a 2 8 BOC Smoothcut Advance MIG 275R amp MIG 350R Service manual Ver 1 Rev 1 0314 1 3 4 Fan board schematic Ser No Description CON1 Fan C5 fan startup capacitor CON2 AC220V input Notice MIG350R has common principle Caption needed Ver 1 Rev 1 0314 BOC Smoothcut Advance MIG 275R amp MIG 350R Service manual 1 3 5 Control board schematic CON3 CON8 CON12 CONIO CONILL CON15 CON4 o W J eui Mi D N mom Tre CoL og T ty 200200 Doo loo Ja Q g D24 D27 D26 R27 o oO gik a o a o S 3 2 N JI S o N o P a CO LT LI LT LI t Do al LT o a a Q m B LI c Joe JA o N od kx Ser No Pin Description Ser No Pin Description m CON9 Current feedback signal CON1 DC auxiliary current MIG275R DC auxiliary current is 310V while MIG350R is 540V if the above DC GND auxiliary current needs to be repaired particular S ieri tbe pa teat iti d 4 X Voltage feedback signal d is e paid to the positive an CONTO DAV TE tang BS RoE Guard lamp 2 GND 24V NE N 4 Power light NC
4. ire feed board PHB 93 control circuit Check CON1 in 7 Check seal wave control signal If pin 7 high ansistor Q5 damaged and needs replacing heck whether there is a cold joint in wire feed board HB 93 Q1 check TL494 pin 4 potential If high replace TL494 2 Check and replace in needed ct N 5 UJ cO mou D Ca 1 Check the performance of rectifier module and replace 2 Check the performance of IGBT module or LED light in the IGBT board resistors tantalum capacitors single tube IGBT and the diode Replace board 1 Check whether the fan is damage and causes overheating 2 Check IGBT absorption cement resistors and capacitors If damaged replace Ver 1 Rev 1 0314 BOC Smoothcut Advance MIG 275R amp MIG 350R Service manual 15 Problem Possible Reasons Solution 10 Porosity in the weld 11 Welding current unstable and large spatter 1 Solenoid valve does not respond a Solenoid valve coil broken b Solenoid valve cable broken c Solenoid voltage control circuit damaged 2 Lack of shielding gas a The gas flow rate is too low b The solenoid valve is blocked c Check the connection between the cylinder and torch also check the inside of the gas tube d If using CO the regulator heater power supply may not have been turned on or is not being used Output controlling voltage is not stable Voltage and current are not adjusted in right posi
5. mpere meter c characteristic re feed speed nce pin 4 is at high potential fast wire speed ce at low potential low wire speed nce pin 5 is at high potential check gas nce at low potential do not check gas Once pin 2 is at high potential 2T once at low potential 4T 12V Ver 1 Rev 1 0314 BOC Smoothcut Advance MIG 275R amp MIG 350R Service manual 7 1 3 2 Bottom board schematic C8 ce c a GC PZ01 060 A1 O PCON3 i 1 3 CONG 2 O lt gt m c TH D3 g R6 R4 PCON4 4 L D4 i M CDI Ki K2 R5 R3 UL id CI TI econ P es ca Cs O 2NO3 P d RR5 RR4 RR3 RR2 RRI CON2 JP3 Il D c ae FDC3400 ng RCZZUU TN E g E g SAGE oo CF A END DC340y AC220U IN L R RU2 Ser No Pin Description CON3 AC240V CON4 AC240V connect solenoid valve CON6 1 GND 3 24V CON7 1 GND 2 DC340V K1 Solenoid valve relay if the solenoid valve is not pulling in if 24V relay pulls in solenoid valve damaged if 24V relay does not pull in Q1 724 circuit damage check it K2 Slow starting relay RX1 Field discharge resistance if startup frequency is high field discharge resistance will break off cool down for a while and re start 1 3 3 Bottom board circuit diagram
6. the recipient of this document or any other person relying on the information contained herein The recipient agrees that it shall not seek to sue or hold BOC or their respective agents liable in any such respect for the provision of this document or any other information Ver 1 Rev 1 0314 BOC Smoothcut Advance MIG 275R amp MIG 350R Service manual Contents 1 0 1 1 1 2 1 3 2 0 3 0 3 1 3 2 3 3 3 4 Fundamental schematic and circuit diagrams Wiring diagram for Advance MIG 275R Wiring diagram for Advance MIG 350R Advance MIG 275R 350R boards Troubleshooting and maintenance Exploded view and component parts list Exploded view of Advance MIG 275R Component parts list for Advance MIG 275R Exploded view of Advance MIG 350R Component parts list for Advance MIG 350R nus 14 16 16 17 19 20 4 BOC Smoothcut Advance MIG 275R amp MIG 350R Service manual Ver 1 Rev 1 0314 1 0 Fundamental schematic and circuit diagrams 11 Wiring diagram for Advance MIG 275R Inverter Board PMB 49 D rr f SI Fan Board Pip 814C E tif P wa avoe NNI x Capacitor Bank Board PZB 60 A AC240V EMC board PHB 91 A Ditigal Panel o o 4 29 PKB 76 B Ver 1 Rev 1 0314 BOC Smoothcut Advance MIG 275R amp MIG 350R Service manual 12 Wiring diagram for Advance MIG 350R CI cap EMC board PHB 85 B R K rase on S La peeing ei pn Wire Feed Board Main Control
7. 1 R 23 010400 12 A0 23 010400 12 A0 27 Wire feed insulation 1 R 23 010500 60 A 23 010500 60 A 28 3P insulation 1 R 23 010500 67 A0 23 010500 67 A0 29 EMC insulation R 23 010800 18 A 23 010800 18 A 30 Radiator insulation 2 R 23 010800 27 A 23 010800 27 A 31 Cylinder top plate R 23 020103 02 A0 23 020103 02 A0 32 Cylinder left plate R 23 020303 03 A0 23 020303 03 A0 33 Cylinder right plate R 23 020403 03 A0 23 020403 03 A0 34 Fan cove 23 020602 07 A0 23 020602 07 A0 35 Rectifier bridge and IGBT connector R 24 021300 05 A0 24 021300 05 A0 36 Positive and radiator connector 1 R 24 021800 06 A0 24 021800 06 A0 37 Front wheel mounting 1 R 25 020102 51 A0 25 020102 51 A0 38 Partition board stand 1 R 25 020102 52 A 25 020102 52 A0 39 Radiator stand 4 R 25 020200 10 A 25 020200 10 A0 40 Radiator frame 4 R 25 020200 30 A0 25 020200 30 A0 41 Radiator heatsink R 26 020551 01 A 26 020551 01 A0 42 Radiator heatsink R 26 020552 01 A0 26 020552 01 A0 43 Circlip for shaft 2 R 36 810253 01 0 36 810253 01 00 44 Fan 1 37 120522 02 00 37 120522 02 00 45 Fan guard 1 R 37 130310 01 00 37 130310 01 00 46 Wheel rear R 37 160220 11 02 37 160220 11 00 47 Universal wheel front R 37 160320 10 00 37 160320 10 00 48 Self locking buckle 1 R 37 190400 08 00 37 190400 08 00 49 Push lock 2 37 190401 01 00 N 37 190401 01 00 37 190401 01 00 50 Protection box R 37 190500 11 00 37 190500 11 00 51 Handle 37 241200 10 00 37 241200 10 00 52 Handle screw cover 2 37 251900 02 00 37 251
8. Board PKB 77 D Ditigal Panel 0 0 42 PKB 76 B v check o o ns a BOC Smoothcut Advance MIG 275R amp MIG 350R Service manual Ver 1 Rev 1 0314 1 3 Advance MIG 275R amp MIG 350R boards 1 3 1 Control panel schematic LED 4 Os LED18 LEDI9 KEYI PCNI R36 R21 R23 y xo Trace C33 tt C35 it R29 C36 C22 HL ICI1 4 C21 C37 C38 7 c20 o7 Ll 90 Ra LED21 LED22 S KEY6 a GC PK01 076 A3 2011 05 06 C31 LED 3 tt R25 c24 R20 ik c28 26 it c25 Ice 28 ik jc27 C32 R27 it c23 tt R24 ik jc26 uu GAS CHECK y SN B KO Z9 Z8 ala KEY8 LED16 m 3 KEY9 Om eon Bran a MOTO CHECK anh R33 R34 R32 A Atas S but C Disita er AUN 94U0 036 X 1106A01 a 5 Description WIN D d CN Ln HR WIN ns NO COON c S IE le o UI oO c tmeter D D It Set signal D W zDODtzTOST o no D N 2 V O o 12V NC NC
9. R 40 141010 04 00 59 35mm female socket 2 R 40 160810 01 00 R 40 160810 01 00 40 160810 01 00 60 Wire feed board 1 R 51 PH01 093 B PH 01 093 A1 61 Absorption board 1 2 R 51 PH02 033 B 51 PH 33 B RL 62 Absorption board 2 1 R 51 PH02 077 CRL 51 PH 77 CRL 63 3P board 1 R 51 PH01 081 CRL 51 PH 81 C RL 64 EMC board R 51 PH02 091 A RL 51 PH 91 A RL 65 Absorption board 3 R 51 PH02 092 C RL 51 PH 92 B RL 66 Control board digital R 51 PK01 076 B RL 51 PK 76 D RL 67 Control board main R 51 PK01 077 E RL 51 PK77 E RL 68 IGBT inverter PCB top R 51 PM01 049 D1 51 PM 49 D1 RL 69 Capacitor PCB bottom 1 R 51 PZ01 060 A RL 51 PZ 60 A RL 70 Interconnecting cable 1m 1 R 52 3501 00 A0 R 52 3501 00 A0 71 Interconnecting cable 10m 1 R 52 3510 00 A0 R 52 3510 00 A0 BOC Smoothcut Advance MIG 275R amp MIG 350R Service manual 3 3 Exploded view of Advance MIG 350R 13 8 22 65 49 4142 3011 57 66 59 23 64 61 17 2 32 31 3 20 50 o 26 28 29 52 8 M T EPI 15 Gt re T a SS 9 7 N PS pi 2 EUM E aii m NIN al aL ie L 16 lt pali PM JAUNE a ence we 1 S lt YO 21 24 T 98 31 38 41 36 4 5 3 1 9 160 118135 139140 NANANII NB 46 N25 153 20 BOC Smoothcut Advance MIG 275R amp MIG 350R Service manual Ver 1 Rev 1 0314 3 4 Component parts list for Advance MIG 350R
10. 020303 03 A0 34 Cylinder right plate 1 R 23 020403 03 A0 23 020403 03 A0 35 Fan cove 2 23 020602 05 A0 23 020602 05 A0 36 Spring 2 R 23 040000 58 A0 23 040000 58 A0 37 Front roll mounting 1 R 25 020102 51 A0 25 020102 51 A0 38 Supporting frame 1 R 25 020102 52 A0 25 020102 52 A0 39 Radiator stand 4 25 020200 13 A0 25 020200 13 A0 40 Capacitor stand 2 25 020200 14 A0 25 020200 14 A0 41 Radiator board 1 R 26 010270 01 A0 26 010270 01 A0 42 Radiator heatsink 1 R 26 020531 01 A1 26 020531 01 A0 43 Radiator heatsink 1 R 26 020532 01 A6 26 020532 01 A2 44 Circlip for Shaft 2 R 36 810253 01 00 36 810253 01 00 45 Fan 1 R 37 120211 03 00 37 120211 03 00 46 Fan guard 1 R 37 130210 01 00 37 130210 01 00 47 Wheel rear 2 R 37 160220 11 02 37 160220 11 02 48 Universal wheel front 2 R 37 160320 10 00 37 160320 10 00 49 Self locking buckle 1 R 37 190400 08 00 37 190400 08 00 50 Push lock 2 37 190401 01 00 N 37 190401 01 00 37 190401 01 00 51 Protection box 1 R 37 190500 11 00 37 190500 11 00 52 Handle 1 37 241200 10 00 37 241200 10 00 53 54 Handle screw cover 2 37 251900 02 00 37 251900 02 00 55 Wheel cover 2 37 252000 01 A1 37 252000 01 A0 Ver 1 Rev 1 0314 BOC Smoothcut Advance MIG 275R amp MIG 350R Service manual 18 Item Description Qty Material Part No BOC Part No 56 Hinge 2 R 37 290000 01 00 37 290000 01 00 57 Tubular column 4 R 38 503070 11 00 38 503070 11 00 58 14 pin socket R 40 141010 04 00
11. 900 02 00 53 Wheel cover 2 37 252000 01 A1 37 252000 01 A0 54 Hinge 2 R 3 290000 01 00 37 290000 01 00 55 14 pin socket 1 R 40 141010 04 00 R 40 141010 04 00 Ver 1 Rev 1 0314 BOC Smoothcut Advance MIG 275R amp MIG 350R Service manual Item Description Qty Material Part No BOC Part No 56 35mm female socket 2 R 40 160810 01 00 R 40 160810 01 00 57 Wire feed board R 51 PH01 093 B PH 01 093 A1 58 Absorption board 1 2 R 51 PH02 033 B 51 PH 33 B RL 59 3P board R 51 PH01 081 CRL 51 PH 81 CRL 60 GBT absorption board R 51 PH02 083 A RL 51 PH 83 A RL 61 EMC board R 51 PH02 085 B RL 51 PH 85 B RL 62 Absorption board 2 R 51 PH02 092 CRL 51 PH 92 C RL 63 MIG control module R 51 PK04 004 D RL 51 PK 04 D RL 64 GBT drive module R 51 PK03 015 D RL 51 PK 15 D RL 65 Control board R 51 PK01 076 D RL 51 PK 76 D RL 66 Control board R 51 PK01 077 D RL 51 PK 77 D RL 67 nterconnecting cable 1m R 52 3501 00 A0 R 52 3501 00 A0 68 nterconnecting cable 10m R 52 3510 00 A0 R 52 3510 00 A0 For more information contact the BOC warranty department at warranty boc com BOC Customer Service Centre Australia 131 262 www boc com au New Zealand 0800 111 333 www boc co nz BOC Limited 10 Julius Avenue North Ryde NSW 2113 Australia 970 988 Great South Road Penrose Auckland New Zealand BOC Limited 2014 BOC is a trading name of BOC Limited a Member of The Linde Group Reproduction without perm
12. Aceh ad CON11 15V ai aracteristic signa 2 GND 7 r CON12 Current detection signal E TAE CON13 Drive signal CON4 Current detection signal if pin 1 is at low potential CON14 1 GND no output current if high potential no output GND 2 24V F 3 24V CON5 utual inductor current sampled signal 4 GND a 2 Set signal 7 6 GND pin 5 and pin 6 short circuit 3 Lowest Volt Set signal ND 7 24V seal signal R CON15 NC CON7 CON7 pin 2 voltmeter sampled signal CON8 1 5V Ampere sampled signal 3 GND 10 BOC Smoothcut Advance MIG 275R amp MIG 350R Service manual Ver 1 Rev 1 0314 1 3 6 Control board circuit diagram Ver 1 Rev 1 0314 BOC Smoothcut Advance MIG 275R amp MIG 350R Service manual 11 1 3 7 Control module schematic Ser No Description GND GND Seal signal pin Seals if low potential lower 3525 pin 8 GND C 15V Overheating protection signal if low potential overheating protection is activated C 9 Over current protection Pin 9 is a mutual inductor current sa
13. Smootharc Advance MIG 275R a MIG 350R Service manual Smoothare T 27 BOC A Member of The Linde Group BOC Smoothcut Advance MIG 275R amp MIG 350R Service manual Ver 1 Rev 1 0314 Recommended Safety Precautions Electrical Shock ever touch live electrical parts Always repair or replace worn or damaged parts Disconnect power source before performing any maintenance or service Earth all work materials ever work in moist or damp areas Warranty Information Terms of Warranty The Smootharc ADVANCE machine has a limited warranty that covers manufacturing and material defects only The warranty is affected on the day of purchase and does not cover any freight packaging and insurance costs Verbal promises that do not comply with terms of warranty are not binding on warrantor Limitations on Warranty The following conditions are not covered under terms of warranty loss or damage due to or resulting from natural wear and tear non compliance with operating and maintenance instructions connection to incorrect or faulty voltage supply including voltage surges outside equipment specs incorrect gas pressure overloading transport or storage damage or fire or damage due to natural causes e g lightning or flood This warranty does not cover direct or indirect expenses loss damage of costs including but not limited to daily allowances or accommodation and travelling costs
14. bridge 1 R 04 010403 02 00 04 010403 02 00 9 LED luminous yellow 1 R 04 010700 17 01 04 010700 17 0 10 hermo switch 1 R 06 030000 03 01 06 030000 03 01 11 Diffuse 1 R 06 060000 10 00 06 060000 10 0 12 Circuit breaker 1 R 07 070003 03 00 07 070003 03 00 13 Fuse tube 1 09 010000 05 00 09 010000 05 00 14 G 275R control output panel 1 R 15 019690 01 A0 5 019690 01 A0 15 BOC host front plastic cover 1 15 900600 01 A0 5 900600 01 A0 16 G 275R rear panel 1 R 16 037092 01 A2 6 037092 01 A1 17 G 200C 275C 275R 350R chassis 1 R 18 171000 01 A1 8 171000 01 A1 18 BOC cylinder tray 1 R 18 205000 01 A0 8 205000 01 A0 19 G 275R right side cover 1 R 19 067269 03 A1 9 067269 03 A0 20 G 200C left side cover 1 R 19 068222 01 A1 9 068222 01 A0 21 G 275R left top side active cover 1 R 19 069269 03 A0 9 069269 03 A0 22 Central board 1 R 21 049200 01 A1 21 049200 01 A0 23 Partition board 1 R 21 051200 01 A0 21 051200 01 A0 24 Rear axle 2 R 22 043001 01 A0 22 043001 01 A0 25 Bottom insulation 1 R 23 010300 56 A0 23 010300 56 A0 26 Control insulation 1 R 23 010400 12 A0 23 010400 12 A0 27 Wire feed insulation 1 R 23 010500 60 A0 23 010500 60 A0 28 3P insulation 1 R 23 010500 67 A0 23 010500 67 A0 29 EMC insulation 1 R 23 010500 72 A0 23 010500 72 A0 30 Thermal buffer aluminum 2 R 23 010800 23 A0 23 010800 23 A0 31 Radiator insulation 2 R 23 010800 26 A1 23 010800 26 A0 32 Cylinder top plate 1 R 23 020103 02 A0 23 020103 02 A0 33 Cylinder left plate 1 R 23 020303 03 A0 23
15. ission is strictly prohibited Details given in this document are believed to be correct at the time of printing Whilst proper care has been taken in the preparation no liability for injury or damage resulting from its improper use can be accepted MP12 0813 1 FDAUS 0314
16. mpled signal If he potential is higher than the set value it will close D V NN UU BB WN co WN a D on signal D ive signa V ive signa V ive signa Sal COND UE IN O B Le 0 Rae Les H es o C N ca e ive signa N C N N a 12 BOC Smoothcut Advance MIG 275R amp MIG 350R Service manual Ver 1 Rev 1 0314 1 3 8 Wire feed board schematic O o Ha o i CON4 o oO o ww 3 c N c Oo xij er bc oi Ha aeo Bg O N c e wo g 3 3 og o gt a W gt o o e N o o o No o O N 3 o Leo LOTTE a o c Ww o L EL s C22 R21 N N ao D11 D17 D12 R32 R26 R39 D24 R21 UU i Ioann CONS C2 N L EH Lr LT I o N HUNI x D N o d GC PHO1 093 Uer A02 Ser No Pin Description Ser No Pin Description CON5 If solenoid valve gas check and hand switch is CON1 1 GND on solenoid valve should pull in thus allowing gas 2 24V feed i AN CON6 Fan switch signal S sahi CON7 1 12V a_i l c 3 2T AT If pin 3 potential is high 2T If low potential 6 GND pin 5 and pin 6 short circuit AT a ea seal signal CON8 NC wire diameter option CON Wire Teeder CON9 2 Wire feed speed set signal other pins NC ne n CON10 1 02V l n 2 If pin 2 is at high potential Q8 breaks over closes Check gas If pin 3 potential is higher Q6 break
17. not working 8 Press the torch switch abnormal indication light on no output 9 Abnormally high welding current or abnormal indicator light while welding 1 The external power supply is abnormal power wires may not be properly connected Test point 1 test the input voltage on the EMC board and power board input pin 2 Rectifier silicon bridge damage causes the input to short circuit 1 Torch switch is damaged or the control wire is loose 2 Poor contact of the torch and the power source or wire eeder connections 3 The auxiliary power supply has a circuit failure 1 Bottom board PZ 60 A degaussing resistance damage the main relay K2 7D361 pressure sensitive resistor damage 2 The supply voltage is too high causing over voltage protection to activate 3 Continuously switching on and off within a short period of time resulting in the startup resistor overheating Can t start up The control board auxiliary power supply is damaged Power wire or power supply bottom board short circuit Over voltage causes damage to the varistor Damage to the silicon bridge causes short circuit WN 4 zx Gas circuit is blocked 2 The valve control circuit is damaged 1 Measure the control panel PK01 077 A whether the drive is 24V with a multimeter 2 Seal wave without drive waveform 3 NO wave 1 Wire feed board wire feed MOSFET and control circuit damaged 2 Wire feeder control wi
18. re broken or poor contact 1 The 2nd rectifier module is damaged 2 The IGBT or drive circuit is damaged 1 Machine is overheating and causes overheating protection to activate 2 IGBT absorption board failure 1 Check and confirm whether the input voltage into the machine no over voltage or under voltage condition make sure the power cord is connected correctly 2 Test the performance of the rectifier silicon bridge 1 Check the torch control wire 2 Reconnect the wire feeder 3 Detect if it s 24V with a multimeter if not check the control board auxiliary power for any component damage 1 Check and replace the components or bottom board 2 Check whether the voltage exceeds AC 380V or grid voltage is too high Stop for a few minutes allow the resistor to cool before restart 4 Check whether the auxiliary power part MOSFET C3843 resistors and other components are damaged and if so replace 1 Replace the power wire or repair bottom board Replace the varistor re adjust the input voltage 3 Check for a short circuit with a multimeter and replace the silicon bridge 1 PZ 60 A relay K1 pulls in replace the solenoid valve 2 Inspect and replace if needed 3 If PZ 60 A has 24V and the relay does not pull in hen check the valve control circuit components i e MOSFET 724 and wire circui 1 If not 24V then the R70 1 ohm resistor is damaged heck whether there is a drive waveform from the 525 chip check the circuit in this area
19. stable volt D20 reverse break down TL494 pin 2 over solenoid valve pull in gas feeds CON4 1 Current detection signal If output end current exists feeds wire in normally if no load no current pin 1 has low potential TL494 pin 2 potential will be lowered wire feed speed becomes slow 2 GND NC high potential wire feed speed is at maximum CON11 1 2AV BOC Smoothcut Advance MIG 275R amp MIG 350R Service manual 13 Ver 1 Rev 1 0314 1 3 9 Wire feed board circuit diagram torch switch wire feeder RB F B Y E n gt Ir go tt LIL m LIL m LL a Ll R 2TI4T current checlang gas checlang wire checking solenoid valve wire switch 14 BOC Smoothcut Advance MIG 275R amp MIG 350R Service manual Ver 1 Rev 1 0314 2 0 Troubleshooting and maintenance Problem Possible Reasons Solution 1 Switch on and no response 2 Switch on fan is working urn on the switch of welding orch but still no response 3 Power light is on the fan stops after a while or once he torch switch is pressed he machine shuts down EN WN art up and the air switch eaks c 5 Start up no gas feed or valve not working other functions are normal 6 Press the torch switch gas flows but no voltage indication in the panel no oad wire feeder is not working 7 Press the torch switch gas out there is a voltage indication in the panel no oad but the wire feeder is
20. th and is professional opinion only Information in this document has been derived from third parties and though BOC believes it to be reliable as at the time of printing BOC makes no representation or warranty as to the accuracy reliability or completeness of information in this document and does not assume any responsibility for updating any information or correcting any error or omission which may become apparent after the document has been issued Neither BOC nor any of its agents has independently verified the accuracy of the information contained in this document The information in this document is commercial in confidence and is not to be reproduced The recipient acknowledges and agrees that it must make its own independent investigation and should consider seeking appropriate professional recommendation in reviewing and evaluating the information This document does not take into account the particular circumstances of the recipient and the recipient should not rely on this document in making any decisions including but not limited to business safety or other operations decisions Except insofar as liability under any statute cannot be excluded BOC and its affiliates directors employees contractors and consultants do not accept any liability whether arising in contract tort or otherwise for any error or omission in this document or for any resulting loss or damage whether direct indirect consequential or otherwise suffered by
21. tion The potentiometer has been damaged The unstable current is caused by using incorrect size contact tip Wire feeder has been damaged or wire feed rolls are worn Wire feeder quide tube is aged The torch has been damaged or is wo Wire stick out is too long a Aa W N 1 Check and replace if needed 2 Adjust or replace CON OU BB U N Adju Adju Rep Rep Rep Rep Rep Sho st suitable voltage with current st again ace ace ace ace ace ten stick out BOC Smoothcut Advance MIG 275R amp MIG 350R Service manual 3 0 Exploded view and component parts list 3 1 Exploded view of Advance MIG 275R 9 14 2 50 66 51 BOC Smoothcut Advance MIG 275R amp MIG 350R Service manual Ver 1 Rev 1 0314 3 2 Component parts list for Advance MIG 275R Item Description Qty Material Part No BOC Part No 1 Polyester capacitor 1 R 02 010403 02 00 02 010403 02 00 2 Polyester capacitor 2 R 02 010403 04 00 02 010403 04 00 3 oroidal transformer 1 R 03 010303 23 01 03 010303 23 00 4 Current transformer 1 R 03 010400 05 00 03 010400 05 0 5 Reacto 1 R 03 020200 27 01 03 020200 27 0 6 agnet ring 4 R 03 030200 04 00 03 030200 04 0 7 Rectifier module 2 R 04 010300 26 00 04 010300 26 00 8 3P rectifier
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