Brother BAS-300A Series Service Manual
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Summary of Contents for Brother BAS-300A Series
- Page 1 T AOH BS SERVICE MANUAL (ELECTRICAL) BAS-300A SERIES BAS-304A.311A.314A.315A 326A.326LA.341A.342A...
- Page 3 This service manual has been compiled so that it can be made into a book since electrical descriptions for the BAS-300A series are very similar. Applicable models are BAS-304A, 311 A, 314A, 315A, 326A, 326LA, 341A, and 342A. For some of them, the electrical description separated for the air and solenoid specifications.
- Page 4 CONTENTS ELECTRICAL CHECK SWITCH Fuses Voltage measurement Control Explanation of connectors Dip switch settings TROUBLESHOOTING PROBLEM DETERMINATION SOLUTION OPTIONS CONTROL CIRCUIT BLOCK DIAGRAM...
- Page 5 ELECTRICAL CHECK DIP SWITCH Warning Nevertouch three large-sizedcapacitorson the power circuit board(seethe illustration below). Thehigh- voltage residual chargesstay for a minimum of 1- 2 minutes after the power isturned off. Cautions * During checking or repair work when the power isapplied, take care not toshort -circuit terminals. * Checkif the cooling fan in the control boxworkscorrectly.
- Page 6 Voltage measurement 1. Checkng the control voltage Turnon powerwhile connecting the connector P 8to the control PCB, t hen measure the voltages betweenpins 1and 2,3 and4, andbetween5and6 of connectorPl. Check points of P8 Acceptable va lue on the control Approx. 65 Vdc Between pins 1and 2 Approx.
- Page 7 4. Checkng air valve's voltage NOTE: When the machine is for solenoid specification of the BAS-304A or 31 IA, there is no need to connect the air valves. Turn the power switch OFF. Disconnect connector P8 from '8, then measure the resistance of each valve.
- Page 8 Control Solenoid connector Synchronizer connector Connector for emergencystop, zero-point sygnal and thread breakage detection X-drive pulse motor connector Y-drive pulse motor connector Foot switch connector Programming device connector valve connector Machine light connector (6V AC, 2A) 110: Marker light connector (5V AC, 3A)
- Page 9 Explanation of connectors If the machine has been disassembled or adjusted during repair work, most of the machine troubles are due to connector problems including improper connection or weak contact. It is, therefore, necessary to check each connector number and pin contact for correct connection prior to proceeding to the troubleshooting procedures.
- Page 10 Symptoms resulting from wrong connection Connector No. and location Drive signals and source • The POWER lamp does not come on. Main Although the speed control dial is turned, Speed control signal the machine does not change the rotation speed and keeps it at 2000 spm. Control panel PCB e Malfunction of programming device Key and switch signals...
- Page 11 Dip switch settings NOTE:Besureto turn off the power before changingthe DIPswitchsettings. Motor circuit board When Work clamp does not rise when sewing completed Right* left two-step work clamp (When No. 4 is ON) For the BAS-304A or 31 IA Left -+ right two-step work clamp (When No. 4 is ON) with solenoid specification, Whenthe switches 2, 3and4areon,left andrightwork clamps will descend set@ No.2, 3, and 4 to OFF.
- Page 12 Thesettingof the DIP switchO inthecontrolboxdetermines t hemachine model. If thesettingisnotcorrectfor the machine head,it maycause damage to a printedcircuitboard 304A 31 IA 326A 326LA 341A 342A BAS-326LA No.1,20N No.2 No.3, 4 OFF ERROR LIST Ca use Emergency stop switch pressed Trouble with the motor or synchronizer / Motor stopped when voltage dropped Over-a Floppy disk not inserted, or cable not properly connected Floppy disk is locked (write protected)
- Page 13 TROUBLESHOOTING Indicates manual operation. Indicates switch operation. Selects the course of action to follow, using a yes-or-no decision-making process. Ind icates that the procedure to follow appears in the first column of "problem determination and solution table". Indicates setting-up operation. Indicates that the procedure...
- Page 14 Start Turn on POWER switch. Powering-up sequence Isthe power lamp 'it? Insert the floppy disk. Turn on POWER switch. Press the PRO NO. switch, then press RIW switch. Floppy Does the disk indicator lamp on the floppy insertion disk drive come on to indicate that the machine is reading...
- Page 15 Turn on POWER switch. Step on the presser pl ate lifter switch. Do the presser plate and presser foot Presser foot Set cassette presser material to be sewn. plate operation Step on the presser plate lifter switch. Do the presser plate and presser foot lower? Input sewi ng data.
- Page 16 Input sewing data and shift to the sewing start position. Press the TEST switch. Isthe TESTlamp lit? Step on the start foot switch. Isthe material fed during sewing stitch by stitch? Step on the Test presser plate lifter switch. Does the feedi ng operation get faster? Release presser plate lifter...
- Page 17 Press the TEST switch to turn the TESTlamp. Input sewi ng data and shift to the sewing start position. Step on the start foot switch. Doesthe machine operate? Does any error code appear on the ERROR NO. indicator? Sewing operation Does the presser plate move stitch by stitch to sew the material?
- Page 18 Input sewing data and start sewing operation. Press the EM switch while sewi ng. Does error code No. 1 appear # 19 when the machine and feeding operati on stops? Press the EM switch again. t e machine stop with the needle at the upper sition when EMERGENCY lamp oes off and thread rimmed?
- Page 19 Turn POWER switch. Pressthe P Key on the programmer. Does the presser plate return to the home position? Programming device Is the display illuminated? Does each key switch function correctly? Stop (No abnormality) -15-...
- Page 20 PROBLEM DETERMINATION SOLUTION Precautions 1. Besureto turn the power switch OFFbeforeopeningthe control boxcoveror plugging in / unplugging the power cord. 2. When replacing a fuse, be sureto usea new one having the samequality and capacityasthe old one. Problem determination and solution table Prior to proceeding to the following table, check that —- no fuse...
- Page 21 NO. IN CHAPTER PROBABLE CAUSES REPLACEMENT CHECK/ ADJUSTMENT/ REPAIR FLOWCHART PARTS ERROR STATUS 3. Presser plate lifter If the presser plate automatically Presser plate If the RIW switch switch defective operates just by turni ng the power on lifter switch pressed, the without any other operator action, the assembly (2-...
- Page 22 NO. IN CHAPTER PROBABLE CAUSES REPLACEMENT CHECK/ ADJUSTMENT / REPAIR FLOWCHART PARTS ERROR STATUS 5. Air valve defective U nplug connector P1 of the control box, Air valve The presser plate then measure the resistance. will not rise when If it is not approx. 400 Q between pins 1 the presser plate and 10, and between pins 2 and 10, the lifter...
- Page 23 NO. IN CHAPTER PROBABLE CAUSES REPLACEMENT CHECK ADJUSTMENT 1 REPAIR FLOWCHART PARTS ERROR STATUS Presser plate lifter If the presser plate automatically lowers or Presser pl ate The presser plate switch defective rises when the power is turned OFF or ON, lifter switch will...
- Page 24 IN CHAPTER PROBABLE CAUSES REPLACEMENT CHECK/ ADJUSTMENT / REPAIR FLOWCHART PARTS ERROR STATUS Refer Power Power The presser plate defective will not return its home position when the start Pulse motor or its Unpl ug connector P4 and P5 from control Pu Ise motor foot switch...
- Page 25 NO. IN CHAPTER PROBABLE CAUSES REPLACEMENT FLOWCHART CHECK/ ADJUSTMENT REPAIR ERROR STATUS PARTS Presser plate lifter Refer to #4, 3. Rapid feed can not switch its cable be used during the defective test. Feeding mechanism Adjust the feeding mechanism to move The machine does not adjusted.
- Page 26 IN CHAPTER PROBABLE CAUSES REPLACEMENT CHECK/ ADJUSTMENT / REPAIR FLOWCHART PARTS ERROR STATUS 3. Thread trimming Unplug connector P9, then measure the Thread solenoid, main resistance. trimmi ng The thread cannot < Thread trimmer solenoid > between pins solenoid be cut. presser solenoid or cable defective...
- Page 27 NO. IN CHAPTER PROBABLE CAUSES REPLACEMENT CHECK/ ADJUSTMENT / REPAIR FLOWCHART PARTS ERROR STATUS Programmer Reattach connectors P7 and J7, and connector or its Programming connector P11 of the control circuit board. cable defective cannot be made. Programmer Replace the programmer. Programmer defective Main...
- Page 28 OPTIONS Using terminals of lamp and marker light e (Ac4.5V) O (Ac6V) When using the lamp, use the connector O (AC6V). When using the marker light, use the connector (AC4.5V). Lamp * The lamp below is an option. (S-15404-001 ML651-01 lamp P assembly) * When purchasing a lamp on the market, replace the connectors of the lamp with the parts described below.
- Page 29 The PC set and the PC programmer assembly have been introduced. By attaching the sequencer, the val ves and switches can be added without replacing the control P-ROM. PC programmer assembly S25157-ooo PC set S33257-009...
- Page 31 CONTROL CIRCUIT BLOCK DIAGRAM Prograner NE-UP Htsp- Synchron iter P-SHF-AA MOLEX(2P)___ IOP- HE-AA MAIN Start AC10v- MOTOR ACIOv-A S29008 Presser S W tov-C DC IN foot p 13 SYNCHRONIZER ACIOV- MOTOR PROGRAMMER hite ACIOV Start laek STARr FOOT Presserb foot PANEL S16S78 MAIN...
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