Service Precautions; Notes On Soldering; Notes On Replacing; Caution - Pioneer SC-LX85 Service Manual

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1. SERVICE PRECAUTIONS

1.1 NOTES ON SOLDERING

• For environmental protection, lead-free solder is used on the printed circuit boards mounted in this unit.
Be sure to use lead-free solder and a soldering iron that can meet specifications for use with lead-free solders for repairs
accompanied by reworking of soldering.
• Compared with conventional eutectic solders, lead-free solders have higher melting points, by approximately 40 °C.
Therefore, for lead-free soldering, the tip temperature of a soldering iron must be set to around 373 °C in general, although
the temperature depends on the heat capacity of the PC board on which reworking is required and the weight of the tip of
the soldering iron.
Do NOT use a soldering iron whose tip temperature cannot be controlled.
Compared with eutectic solders, lead-free solders have higher bond strengths but slower wetting times and higher melting
temperatures (hard to melt/easy to harden).
The following lead-free solders are available as service parts:
• Parts numbers of lead-free solder:
GYP1006 1.0 in dia.
GYP1007 0.6 in dia.
GYP1008 0.3 in dia.

1.2 NOTES ON REPLACING

The part listed below is difficult to replace as a discrete component part.
When the part listed in the table is defective, replace whole Assy.
PCB ASSY
ASSY NAME
Part No.
AWX9827
(SC-57)
DIGITAL MAIN
ASSY AWX9824
(SC-55)
(SC-1526-K)
AWH7030
(SC-57)
IR POWER
AMP ASSY AWH7039
(SC-55)
(SC-1526-K)

1.3 CAUTION

• Discharging
Before starting the diagnosis, wait for three minutes until the electricity of the unit is discharged.
• Ground Points
Please refer to page 51, "Ground Points".
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Ref No. FUNCTION
IC101 MAIN CPU
IC903 HDMI RECEIVER
IC905 HDMI SWITCH
DIGITAL VIDEO FORMAT
IC1204
CONVERTER
IC1212(MAIN) DDR2-SDRAM
DDR2-SDRAM
IC1212 (SUB)
CONNECTOR
JA1501
(for BLUE TOOTH)
IC1602 HDMI TRANSMITTER
IC1603 HDMI TRANSMITTER
IC9002 1st DSP
IC9702 2nd DSP
IC9204 MEDIA PROCESSOR
IC9203 LAN PHY
IC9205 FLASH ROM
IC9510 REGULATOR
IC9509 REGULATOR
Q4101,4102
Q4201,4202
Q4301,4302
Q4401,4402
Q4501,4502
FET
Q4601,4602
Q4701,4702
Q4801,4802
Q4901,4902
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Parts that is Difficult to Replace
Part No.
UPD61283F1-407LU2A
SII9233ACTU
SII9387CTU
88DE2750
H5PS5162GFR-S5C-K
K4T51163QI-HCE7
CKS5712-A
SII9136CTU
SII9136CTU
D810K013BZKB400-K
D810K013BZKB400-K
DM860
LAN8700C-AEZG
AYW7346-A
NJM2846DL3-33
MM1701WH
IRF6775MPBF
SC-57
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A
B
C
Remarks
BGA
IC with heat-pad
IC with heat-pad
BGA
BGA
BGA
Land is under parts
D
IC with heat-pad
IC with heat-pad
BGA
BGA
BGA
IC with heat-pad
MAC Address
closed-door
IC with heat-pad
IC with heat-pad
E
Land is under parts
F
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