Service Precautions; Notes On Soldering; Notes On Dsp Pcb Assy - Pioneer DDJ-SX2 Service Manual

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1. SERVICE PRECAUTIONS

1.1 NOTES ON SOLDERING

A
• 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 ºC.
Therefore, for lead-free soldering, the tip temperature of a soldering iron must be set to around 373 ºC 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
B
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.
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1.2 NOTES ON DSP PCB ASSY

For stabilization of power-supply start, the circuitry of the DSP PCB Assy was modified during production.
The serial numbers of the DDJ-SX2 units with the DSP PCB Assy before modification are as follows:
Model
DDJ-SX2/UXECB
D
DDJ-SX2/SVYXE8
DDJ-SX2/FJKLPXE5
DDJ-SX2/AXE5
The modified parts in the circuitry are shown below. The circuit diagram indicated in this service manual is that after modification.
All the DSP PCB Assys to be supplied as service parts (Part No.: 704-S1MK2-B090) are modified ones.
E
R498 eliminated
F
4
1
2
Not modified R498 eliminated
1 to 1891 1892 to 2409
None 1 to 200
1 to 900 901 to 1600
All modified
2
3
R518 added
DDJ-SX2
3
4
Modified DSP PCB Assy
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