Dear How The clue is the wave manufacturer does not install the sensors to be covered , it is not cheap enough to be a cosmetic feature . The sensors are not designed to "miss" the boards either . Your technician is right on both accounts . The excessive dross not being mentioned in the 1) note, on top of straining pump and residue accumulations on the impeller ( triples your maintenance in no time ) Therefore your technician by the sound of it knows what he's doing even if he perhaps does not describe it in detail . The supervisor IS your problem , you have my sympathy . Paul Klasek ; ResMed . >---------- >From: Hew How Chee[SMTP:[log in to unmask]] >Sent: Saturday, 14 February 1998 14:23 >To: [log in to unmask] >Subject: [TN] To On or Not to On > >Hello, > >Can anybody please help or advice. > >I am trying to settle a dispute between my company's production >supervisor and the maintenance technician on the wave soldering >machine. > >1) The maintenance technician insisted that the wave should be switched >on and off between boards to prevent/lessen "damage" to the wave >creation mechanism. >(The wave can be switched on and off automatically by a sensor on the >conveyor). My production supervisor think otherwise. She covered the >sensor so that the wave would not be off.(She says the sensor can >miss a board) So, who is right ? > >2) My production supervisor sets the preheat to about 95 degree C so >that >the flux would not dry up when the PCB board reaches the wave and to >increase >solderability.(but this created a lotof residue on the solder >bath,according to maintenance). >My maintenance technician says the temperature should be about 120 >degree C >so that it dry up the flux before the board reaches the wave. The reason >is so that >not much residue is created. Who is right again ?? > >Thanks in advance. > >How Chee >Malaysia > >################################################################ >TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c >################################################################ >To subscribe/unsubscribe, send a message to [log in to unmask] with following >text in the body: >To subscribe: SUBSCRIBE TechNet <your full name> >To unsubscribe: SIGNOFF TechNet >################################################################ >Please visit IPC web site (http://jefry.ipc.org/forum.htm) for additional >information. >For the technical support contact Dmitriy Sklyar at [log in to unmask] or >847-509-9700 ext.311 >################################################################ > > ################################################################ TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c ################################################################ To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TechNet <your full name> To unsubscribe: SIGNOFF TechNet ################################################################ Please visit IPC web site (http://jefry.ipc.org/forum.htm) for additional information. For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311 ################################################################