Disassemble/Assemble - Christie DS Series Service Manual

9. Disassemble/Assemble

9-1 Lead free solder [CAUTION]
This product uses lead free solder (unleaded) to help preserve the environment. Please read these
instructions before attempting any soldering work.
Always wear safety glasses to prevent fumes or molten solder from getting into the eyes. Lead
free solder can splatter at high temperatures (600˚C).
 Lead free solder indicator
Printed circuit boards using lead free solder are engraved with an "F" or "LF".
 Properties of lead free solder
The melting point of lead free solder is 40-50˚C higher than leaded solder.
 Servicing solder
Solder with an alloy composition of Sn-3.0Ag-0.5Cu or Sn-0.7Cu is recommended.
Although servicing with leaded solder is possible, there are a few precautions that have to be
taken. (Not taking these precautions may cause the solder to not harden properly, and lead to
consequent malfunctions.)
 Precautions when using leaded solder
- Remove all lead free solder from soldered joints when replacing components.
- If leaded solder should be added to existing lead free joints, mix in the leaded solder thoroughly
after the lead free solder has been completely melted (do not apply the soldering iron without
solder).
 Servicing soldering iron
A soldering iron with a temperature setting capability (temperature control function) is
recommended.
The melting point of lead free solder is higher than leaded solder. Use a soldering iron that
maintains a high stable temperature (large heat capacity), and that allows temperature adjustment
according to the part being serviced, to avoid poor servicing performance.
 Recommended soldering iron:
Soldering iron with temperature control function (temperature range: 320-450˚C)
 Recommended temperature range per part:
Part
Mounting (chips) on mounted PCB
Mounting (chips) on empty PCB
Chassis, metallic shield, etc.
LWU900-DS/LHD878-DS/LWU755-DS
Service Manual
LWU900-DS / LHD878-DS / LWU755-DS
CAUTION
Soldering iron temperature
320˚C±30˚C
380˚C±30˚C
420˚C±30˚C
37
020-001586-01 Rev. 1 (02-2021)
LIT MAN SERV DS Series