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A-A9MK2-K
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A
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F
1. SERVICE PRECAUTIONS
1.1 NOTES ON SOLDERING
1.2 DISCHARGE OF POWER AMPLIFIER
• 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
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.
G
N
D
G
N
D
+
-
REG IC Assy
1. Turn off the power of the product.
2. Discharge both ends of capacitor of Power Assy by short-circuiting (connector G
N
D and +, connector G
N
D
and -) using a resistor with 200
Ω
/10
W
(and above) for 30 seconds.
Resistor with 200
Ω
/10
W
Resistor with 200
Ω
/10
W
Resistor to be used
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QQ 376315150
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TEL 13942296513
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TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
