XM-S400D
2
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.
CONFIRMING THE OPERATION
Please con
fi
rm the car audio unit works even if REM output is not
connected when you connect this unit with the car audio unit by
the HIGH LEVEL input.
PROTECTOR OPERATION CHECK
Thermal Protect
TH503 TEMP_POW2
1. Short across TH503 with the power on in normal room envi-
ronment.
2. Verify that the protector is operated and POWER/PROTECT
indicator
fl
ashes quickly (once every 0.2 seconds). When input
the signal and verify that there is no output on the SP-OUT.
However in normal operation this condition will occur if tem-
perature of TH503 is about 120 ± 5 °C.
3. Verify that the protector is released and there is an output on
the SP-OUT when the short was removed and reset the AMP
REM.
TH502 TEMP and TH501 TEMP_AMP
1. Input signal then short across TH501 with the power on in nor-
mal room environment.
2. Verify that the protector is operated and the POWER/PRO-
TECT indicator
fl
ashes slowly (once every second) then verify
that output signal on the SP-OUT reduce.
However in normal operation this condition will occur if tem-
perature of TH501 is about 101 ± 4 °C and temperature of
TH501 and TH502 difference more than 45 ± 2 °C.
3. Verify that the protector is released and output signal on the
SP-OUT is increate when the short was removed.
Remark:
IC301 there are Over Current Protection, Offset Protection and
Thermal Protection function.
So it also can protect these ones by itself.
The SERVICING NOTES contains important information for servicing. Be sure to read this section before repairing the unit.
DESTINATION ABBREVIATIONS
The following abbreviations for model destinations are used in this
service manual.
• Abbreviations
U
: US, Canadian, AEP, UK, E, Australian models
IND
: Indian model
NOTE FOR REPAIRING BOARD
Only part of electrical parts that mounted on the board of this unit
can be replaced for repair.
Refer to “6. ELECTRICAL PARTS LIST” about electrical parts
for service.
Since electrical parts that are not described in the electrical parts
list cannot be replaced for repair, replace the complete mounted
board when these electrical parts are defective.
GREASE APPLYING OF REPLACING THE COMPLETE
MAIN BOARD OR IC301 ON THE MAIN BOARD
When the complete MAIN board or IC301 on the MAIN board are
replaced, be sure to apply the grease (OIL COMPOUND (KS609))
so as to cover the IC301 on the MAIN board.
IC301
– MAIN Board (Side B) –
grease
