To Service Personnel - Yamaha TX-497 Service Manual

TX-497

TO SERVICE PERSONNEL

Critical Components Information.
Components having special characteristics are marked
and must be replaced with parts having specifications
equal to those originally installed.
WARNING: CHEMICAL CONTENT NOTICE!
The solder used in the production of this product contains LEAD. In addition, other electrical/electronic and /or plastic
(where applicable) components may also contain traces of chemicals found by the California Health and Welfare Agency
(and possibly other entities) to cause cancer and/or birth defects or other reproductive harm.
DO NOT PLACE SOLDER, ELECTRICAL/ELECTRONIC OR PLASTIC COMPONENTS IN YOUR MOUTH FOR ANY REA-
SON WHATSOEVER!
Avoid prolonged, unprotected contact between solder and your skin! When soldering, do not inhale solder fumes or expose
eyes to solder/flux vapor!
If you come in contact with solder or components located inside the enclosure of this product, wash your hands before
handling food.
About leadfree solder / 無鉛ハンダについて
The P.C.B.s installed in this unit are soldered using the
following solder.
TUNER P.C.B.
OPERATION P.C.B.
Among some types of lead free solder currently available,
it is recommended to use one of the following types for the
repair work.
Sn + Ag + Cu (tin + silver + copper)
Sn + Cu (tin + copper)
Sn + Zn + Bi (tin + zinc + bismuth)
Caution:
1. As the melting point temperature of the lead free solder
is about 30°C to 40°C (50°F to 70°F) higher than that of
the lead solder, be sure to use a soldering iron suitable
to each solder.
2. If lead solder must be used, be sure to remove lead free
solder from each terminal section of the parts to be
replaced and from the area around it completely before
soldering, or make sure that the lead-free solder and
lead solder melt together fully.
2
WALL
OUTLET
Side A / A 面
—
—
REFLOW
Side A SMT
Solder Dip
FLOW
Side B MI
EQUIPMENT
UNDER TEST
INSULATING
TABLE
本機に搭載されている基板のハンダ付けに使用されている
ハンダは下記の通りです。
Side B / B 面
Lead Free Solder / 無鉛ハンダ
Lead Free Solder / 無鉛ハンダ
Process
Process
無鉛ハンダにはいくつかの種類がありますが、修理時には
下記のような無鉛ハンダの使用を推奨します。
・Sn+Ag+Cu（錫+銀+銅）
・Sn+Cu（錫+銅）
・Sn+Zn+Bi（錫+亜鉛+ビスマス）
注意：
① 無鉛ハンダの融点温度は通常の鉛入りハンダに比べ30
∼40℃程度高くなっていますので、それぞれのハンダ
に合ったハンダごてをご使用ください。
② 鉛入りハンダを使わざるを得ない場合は、あらかじめ交
換する部品端子部やその周辺部の無鉛ハンダをすべて取
り除くか、あるいは無鉛ハンダと鉛入りハンダが十分に
溶けた状態となるようにハンダ付けしてください。
AC LEAKAGE
TESTER OR
EQUIVALENT