HT-CT780
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.
NOTE OF PERFORMING THE OPERATION CHECK IN
THE STATE THAT HEAT SINK WAS REMOVED
When performing the operation check in the state that this unit was
disassembled, it is possible to perform the operation check in the
state that heat sink was removed. But don’t perform the operation
check in the long time, and perform the operation check in the
volume state as low as possible.
CAPACITOR ELECTRICAL DISCHARGE PROCESSING
When checking the board, for the electric shock prevention, con-
nect the resistors to both ends of respective capacitors to discharge
the capacitor.
C967
800
:
/2 W
800
:
/2 W
– POWER Board (Conductor Side) –
(US, Canadian and Taiwan models)
C967
– POWER Board (Conductor Side) –
(Except US, Canadian and Taiwan models)
C914
C915
800
:
/2 W
800
:
/2 W
The SERVICING NOTES contains important information for servicing. Be sure to read this section before repairing the unit.
MODEL IDENTIFICATION
Distinguish by Part No. on the bottom side of the main unit.
– Bottom view –
MODEL NUMBER LABEL
Part No.
Destination
Part No.
US, CND
4-564-208-0
[]
AEP
4-564-209-0
[]
UK
4-564-209-1
[]
EA3
4-564-211-0
[]
PX
4-567-467-0
[]
SP
4-567-468-0
[]
CH
4-567-469-0
[]
AUS
4-567-470-0
[]
TW
4-567-471-0
[]
BR
4-569-640-0
[]
E3
4-570-359-0
[]
Ver. 1.1
