Information for service about lead-free solder Introduction
Hitachi
introduced lead-free solder to conserve the "Earth Environment". Please refer to the
following before servicing.
(1) Characteristic of lead-free solder
Melting point of lead free solder is 40-50
o
C higher than solder containing lead.
(2) Solder for service
Following composition is recommended.
" Sn - 3.0Ag - 0.5Cu " , or " Sn - 0.7 Cu "
Lead solder can be used, but there is a possibility of failure due to insufficient strength of the solder.
Caution when using solder containing lead.
Please remove previous solder as much as possible from the soldering point.
When soldering, please perfectly melt the lead-free solder to mix well with the previous solder.
(3) Soldering iron for lead-free solder.
Melting point of lead-free solder is higher than solder containing lead.
Use of a soldering tool "with temperature control" and "with much thermal capacitance" is recommended.
(Recommended temperature control : 320
o
C - 450
o
C)
Recommended temperature
PWB with chip parts 320
o
C +/- 30
o
C
PWB without chip parts 380
o
C +/- 30
o
C
Chassis, metal, shield etc. 420
o
C +/- 30
o
C
(4) Identification of lead-free PWB
2004 models >> lead-free solder is introduced
2005 models >> lead-free solder apply
On lead-free PWB, "F" is added at the beginning of stamp on PWB. (e.g. F LC58)
LC58/LC58E
8
Summary of Contents for 50VF820 - 50" Rear Projection TV
Page 96: ...LC58 LC58E CIRCUIT BLOCK DIAGRAM TABLE OF CONTENTS 96 ...
Page 97: ...LC58 LC58E POWER SUPPLY BLOCK DIAGRAM TABLE OF CONTENTS 97 ...
Page 98: ...CONNECTION DIAGRAM TABLE OF CONTENTS LC58 LC58E 98 ...
Page 105: ...LC58 chassis Model 50VF820 55VF820 60VF820 1 FRONT PANEL 2 REAR PANEL LC58 LC58E 105 ...
Page 106: ...LC58E chassis Model 50VG825 55VG825 60VG825 1 FRONT PANEL 2 REAR PANEL LC58 LC58E 106 ...
Page 155: ...SIGNAL PWB Solder side PRINTED CIRCUIT BOARDS BACK TO TABLE OF CONTENTS LC58 LC58E 155 ...
Page 159: ...PRINTED CIRCUIT BOARDS POWER PWB Solder side BACK TO TABLE OF CONTENTS LC58 LC58E 159 ...
Page 190: ......