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中龙集团

Dragon Group China Limited 

                                                                                       

                             

                                     

BIRD

®

 

 

                                         
 

 

www.dragongroupchina.com

   

www.chinaemall.biz

 

 

(1)  Mounting:  The  main  purpose  of  mounting  to  make  every  BGA  solder  align  to  the 

PCB pad with special equipment.   

(2)Hot air reflow: Hot air reflow soldering is the key to the whole BGA Rework.   

The curve of reflow soldering of BGA Rework should be similar with the original 

soldering one. Hot air reflow soldering curve can be divided into four zones, including 

preheat zone, heating zone, recirculation zone and cooling area. These four zones

 

temperature and time parameter can be set respectively, when it connects with the 

computer, these programs can be saved and transferred at any moment.   

In 

reflow soldering 

process, we must choose the right heating temperature and time of 

different zones; at the same time, we should notice the heating speed. Commonly, the 

maximal heating rate is not more than 6

/s before 100

, and the maximal heating rate is not 

more than 3

/s after 100

. In the cooling zone, the maximal cooling rate is not more than 6

/s, because both of the exorbitant heating rate and cooling rate may cause damage to PCB 

and BGA, which sometimes cannot be observed by unaided eyes. For different BGA and 

different 

solder pastes

, we should choose different heating temperature and time. For 

example, 

reflux temperature 

of CBGA BGA should be higher than that of PBGA

choose 

the higher 

reflux temperature

. For 

no clean solder paste

, its 

activity 

is lower than non-

no 

clean solder paste

, so the soldering temperature should not be too high, and the soldering 

time should not be too long, so as to prevent the oxidation of solder 

particle

.   

In hot air reflow soldering, the bottom of PCB board should be heated. There are two 

purposes for this kind of heating. First, avoid the warping and deformation in one-side 

heated PCB board; second, shorten the time of the solder paste melting. For the 

dimension pad of BGA rework, this kind of heating on the bottom of PCB is especially 

important. There are two ways of heating on the bottom of BGA rework equipment. One 

of them is hot air heating, and the other is infrared ray heating. The advantage of hot air 

heating is the homogeneous heating, which common Rework Techniques suggest to adopt 

this way of heating. What opposite with it is the disadvantage of infrared ray

inhomogeneous heating. 

 

We  should  choose  the right  hot  air  reflux  suction  nozzle.  The  hot  air  reflux  nozzle  is 

non-contact heating, which depend on the high temperature air current make every solder 

of  joint  on  BGA  melt  synchronously.  For  that  reason,  it  ensures  the  steady  temperature 

circumstance  in  the  whole  of  reflux  process,  and  it  protects  the  adjacent  parts  from 

damaging by the convective hot air

s regeneration. 

 

B.

 

Installation 

1. Place   

In  order  to  ensure the  validity  of  BGA  Rework  Station,  the  installation  should  meet  the 

following requirements.   

a. Away from inflammable and explosives;   

Summary of Contents for Bird AC-5K

Page 1: ...www chinaemall biz BGA Rework Station AC 5K Dragon Group China Limited Address Fuxin Building Office 12D No 318 Fuhua Road Shenzhen China 518000 Telephone 86 1 379 836 8284 86 755 83292149 Fax 86 755...

Page 2: ...upchina com www chinaemall biz Contents A BGA Rework Station B Installation C Safety Cautions D Introduction of Structure E Operation Steps F PLC Programmable logic Controller G Curve Program Controll...

Page 3: ...eatures of BGA a Types According to the encapsulation material BGA can be classified into the following types 1 PBGA Plastic BGA 2 CBGA Ceramic BGA 3 CCBGA Ceramic Column BGA 4 TBGA Tape BGA 5 CSP Chi...

Page 4: ...e design the assembly of PCB If many pieces of BGA gather on a small area of PCB it will cause the imbalance of PCB in the reflow oven If many big pieces of BGA gather on a certain area of PCB longer...

Page 5: ...d The ideal situation is no poor welding Poor welding may be caused by pollution or the uneven distribution of flux paste What s more warped PCB may also lead to poor welding Open circuit welding spot...

Page 6: ...tep can be omitted b Remove BGA If the BGA will not be reused and the PCB can endure high temperature we can use high temperature shorter heating period to remove it c Clean the pad Pad cleaning is ma...

Page 7: ...PBGA choose the higher reflux temperature For no clean solder paste its activity is lower than non no clean solder paste so the soldering temperature should not be too high and the soldering time shou...

Page 8: ...fire or explosion The PCB and other parts should be put on the PCB bracket 3 No vibration Handle it gently 4 Don t touch the heaters with your hands when it is working or you will get hurt 5 Don t use...

Page 9: ...u use the machine you must read the instructions attentively Note when the machine works it will produce some smell So ensure the comfortable healthy and safe operation environment please keep the air...

Page 10: ...orted high precision thermocouple to detect the top bottom temperature precisely 4 Top bottom heating can be controlled independently by the temperature graphs A cross flow fan cools rapidly to protec...

Page 11: ...y the BGA Flux Paste on the BGA pad evenly with a brush Choose corresponding steel net and plant the soldering ball on the BGA pad with a BGA Reball Kit 5 Soldering Put the BGA on the bottom heating a...

Page 12: ...Dragon Group China Limited BIRD www dragongroupchina com www chinaemall biz F PLC Programmable Logic Controller 1 Top bottom PLC a Panel introduction Model PC410 sectional type temperature controller...

Page 13: ...e meter the upper screen displays the basic model the lower shows the version of the software for the customized meter the customer should pay special attention to the software version to facilitate f...

Page 14: ...e meter is set to constant temperature controller the two display windows PTN and STEP PROFILE RUN these four lights were off OUT1 is used to indicate the working state of output 1 It is on when there...

Page 15: ...HAND switch is forbidden No parameter code Parameter name adjusting range If we set AUTO HAND switch parameter code for AH as Hand AUTO HAND can be switched without interference 3 Adjusting parameter...

Page 16: ...etting please set the differential time to OFF so that it is not changed when the meter is in the process of PID self setting In the system that doesn t allow output signals change frequently we shoul...

Page 17: ...e configuration code and meaning of function parameters Set the configuration password as 808 the parameter code Loc when the meter shows PV press button PAR and for 3 seconds to enter the menu of sof...

Page 18: ...Dragon Group China Limited BIRD www dragongroupchina com www chinaemall biz...

Page 19: ...Dragon Group China Limited BIRD www dragongroupchina com www chinaemall biz...

Page 20: ...he process of PID self setting the system can only set ProP ln and dEr The cooling parameter rEL C should be set by hand If the adjust method is set at positioning adjustment ProP is the difference of...

Page 21: ...g shift 6 SET process set Note DH48S showing time is the range of electrical continuing set by using the coding switch of panel b Explanation of the setting characters The following characters will sh...

Page 22: ...continuity of power is necessary We should minimize interference otherwise restart PID There may be some differences between two parameters of PID starting in the process of warming and starting on co...

Page 23: ...Controller 1 Parameter set of curve program a Pn0 saved curve program 0 4groups r1 the slope of Curve 1 End StEP 0 01 99 9 C min Set the slope at End When the curve program goes to this section it st...

Page 24: ...hen the meter stops it is used as a thermostatic controller We can set is at SP which will display in the lower screen When the meter finishes the curve control procedure it will go into the stop stat...

Page 25: ...f LC r1 L1 d1 r2 L2 d2 is valid only in this running and not saved Other parameters all can the modified and saved c When the meter stops LC r1 L1 d1 r2 L2 d2 and other parameters can be modified and...

Page 26: ...Dragon Group China Limited BIRD www dragongroupchina com www chinaemall biz...

Page 27: ...ad free tin paste The tin balls melt first and surround the tin paste so that the flux in the paste can t volatilize and form bubbles inside If there is via on the soldering pad there may be more bubb...

Page 28: ...burn the components Semi auto reflow retrieval system can save many temperature curves It is important to know the use of temperature curves An precise temperature is the key point in the production w...

Page 29: ...temperature curve Setting of temperature curve is the first and most important step of BGA rework Compared with reflow temperature curve the control of temperature in rework process is more strict be...

Page 30: ...tin absorption line to remove the residual tin In the rework process the pad is likely to be destroyed by the wrong operation of the technician thus the total process of BGA rework becomes a failure...

Page 31: ...Dragon Group China Limited BIRD www dragongroupchina com www chinaemall biz...

Page 32: ...m the positioning bracket 5 Before soldering BGA check the PCB pad and BGA balls one by one After soldering check the appearance one by one again If there is some problem stop assembling and check the...

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