HT-GT1
4
SECTION 1
SERVICING NOTES
UNLEADED SOLDER
Boards requiring use of unleaded solder are printed with the lead-
free mark (LF) indicating the solder contains no lead.
(
Caution:
Some printed circuit boards may not come printed with
the lead free mark due to their particular size)
: LEAD FREE MARK
Unleaded solder has the following characteristics.
• Unleaded solder melts at a temperature about 40 °C higher
than ordinary solder.
Ordinary soldering irons can be used but the iron tip has to be
applied to the solder joint for a slightly longer time.
Soldering irons using a temperature regulator should be set to
about 350 °C.
Caution:
The printed pattern (copper foil) may peel away if
the heated tip is applied for too long, so be careful!
• Strong
viscosity
Unleaded solder is more viscous (sticky, less prone to fl ow)
than ordinary solder so use caution not to let solder bridges
occur such as on IC pins, etc.
•
Usable with ordinary solder
It is best to use only unleaded solder but unleaded solder may
also be added to ordinary solder.
CAPACITOR ELECTRICAL DISCHARGE PROCESSING
When checking the board, for the electric shock prevention, con-
nect the resistors to both ends of resistor (R156) to discharge the
capacitor (C129).
– SMPS Board (Component Side) –
R156
C129
800
:
/2 W
MODEL IDENTIFICATION
Distinguish by Part No. and destination code on the back side of
a main unit.
– Back panel view –
Part No.
Destination code
Destination
Part No.
Destination code
Latin American
4-540-495-0
[]
E32
US
4-540-495-1
[]
U2
Indian, African,
Iranian
4-540-495-2
[]
E12, E3
AEP, UK
4-540-495-3
[]
CEL, CEK
Brazilian
4-540-495-4
[]
BR1
Chilean, Peruvian
4-540-495-5
[]
E51
Mexican
4-540-495-6
[]
MX2
Argentina
4-540-495-7
[]
AR2
Saudi Arabia
4-540-495-8
[]
EA3
Russian
4-540-495-9
[]
RU3
Singapore
4-543-516-0
[]
SP1
Australian
4-543-516-1
[]
AU1
Thai
4-543-516-2
[]
TH1
DESTINATION ABBREVIATIONS
The following abbreviations for model destinations are used in this
service manual.
• Abbreviations
AR :
Argentina
model
AUS :
Australian
model
BR
: Brazilian model
E3
: African and Iranian models
E12
: Indian model
E32
: Latin American model
E51
: Chilean and Peruvian models
EA
: Saudi Arabia model
MX
: Mexican model
RU
: Russian model
SP
: Singapore model
TH :
Thai
model
The SERVICING NOTES contains important information for servicing. Be sure to read this section before repairing the unit.
Ver. 1.2
