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Manual S-20/S-23 HM/S-25 HM/F4/F5 HM /HS-50 Placement of 0402 components 03/2001 edition 43 4 Checklist for the placem ent of 0402 component s 4.1 Changeover t able Å Is the su rface fo r the feede rs free of components …
Placement of 0402 components Manual S-20/S-23 HM/S-25 HM/F4/F5 HM/HS-50
03/2001 edition
42
Å The machine keys for opening the doors over control and servo units and the keys for key
switches should be kept so that they are only accessible to qualified personnel.
Å ALWAYS call in a Siemens AG service engineer if work is required on the machine and there
are no appropriately trained personnel within your company. Siemens AG shall not be held
liable for any claims arising from incorrect work, damage or consequential damage.
Å The machine operators must only carry out activities for which they have received adequate
training and with which they are fully familiar.
Å Always follow the safety regulations specific to your country.
Å Protective devices must not be modified. In particular, circuit-breakers must not be bypassed
and protective devices must not be removed.
Å If significant hazards are identified while the machine is in use, the machine operator is
required to immediately notify the manufacturer in writing so that the manufacturer can initiate
the action needed to reduce the potential hazard.
3 Which machines can be used to place 0402
components?
0402 components can be placed with all the machines from the SIPLACE family that are equipped
with a 12-segment Collect & Place head. This manual covers placement of 0402 components
using the following machines:
– SIPLACE 80S-20
– SIPLACE F4/F5 HM
– SIPLACE S-23 HM
– SIPLACE S-25 HM
– SIPLACE HS-50
Manual S-20/S-23 HM/S-25 HM/F4/F5 HM/HS-50 Placement of 0402 components
03/2001 edition
43
4 Checklist for the placement of 0402 components
4.1 Changeover table
Å
Is the surface for the feeders free of components and metal splinters?
Å Has the changeover table been coupled and locked in place correctly?
When coupling the table, makes sure that the contact surfaces for the changeover table inside
the machine are clean.
Å Do the large tape reels run on spindles?
Å Are the partitions in the tape container locked in place correctly?
Å Has the maintenance described in the maintenance manual been carried out?
4.2 Feeders
Å Are the feeders clean and have all loose components been removed?
Å Do the feeders sit flat, without rocking, on the bed of the changeover table?
In particular, look out for loose components and metal splinters on the bed of the changeover
table.
Å Is the feeder pitch set to 2 mm and is it checked regularly?
Å If paper tapes are used, are the tape supports inserted and positioned correctly?
Å Can the component cover be moved easily?
Å Check that the component cover is not damaged, dirty or oily?
Å Is the component at the correct pick-up position?
Å Has the preventive maintenance for the feeders been carried out?
Å Are the rubber blocks in position on the component cover and in good condition?
Å Has the feeder position recognition system been activated, if required?
Å Are the feeder position recognition fiducials clean and undamaged?
4.3 12-segment Collect&Place head
Å Has the necessary preventive maintenance been carried out?
Å Have you checked any location-related track errors on the station computer, particularly
‘vacuum errors’ and other track errors in relation to the segment and feeders?
Placement of 0402 components Manual S-20/S-23 HM/S-25 HM/F4/F5 HM/HS-50
03/2001 edition
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4.4 Nozzles
Å Have the nozzle magazines been filled correctly for the current set-up?
Å Has a reference run been carried out to check the vacuum values and height offset values?
Å Have the ceramic nozzles been cleaned as described in the job guide?
Å Were the nozzles checked afterwards?
Å Are the nozzle suction surfaces undamaged?
Å Has nozzle scanning been activated, if required?
4.5 Components
Å Who is the manufacturer?
Å Have the mechanical and electrical tolerances been observed?
Å Was a quality check carried out, and has it been certified?
Å Are the leads or connection surfaces of the component in good condition (corrosion, tinning,
shape)?
4.6 Other points to note
Make sure that the component is picked up by the nozzle as centrally as possible. If the
component is set down on the solder pad, it is much less likely that the nozzle will be contaminated
by surplus solder paste. You can prevent the components being picked up off-center by
– regularly using a vacuum cleaner to clean the feeder supporting surface on the component
table, thus ensuring that the feeder lies flat.
– carefully moving the component table into the machine and locking it in place.
– activating feeder position recognition, if possible.
– only replacing the nozzles on the Collect & Place heads manually in exceptional
circumstances, and generally picking up automatically from the nozzle magazines.
– activating nozzle scanning, if possible.
– scanning the nozzles at regular intervals and replacing dirty nozzles.
– using a PCB support so that the PCB does not sag during placement.
– keeping to and not increasing the GF tolerances.