Yamaha SH50M User Manual Page 12

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HS80M/HS50M
12
5. INPUT Circuit Board
(Time required: about 3 minutes)
5-1 Remove the rear panel assembly. (See procedure 3.)
5-2 Remove the four (4) screws marked [110] and the
screw marked [115]. (Fig. 3)
5-3 Remove the LEVEL knob, the hexagonal nut [E] and
washer [D]. (Fig. 3, Photo. 5)
5-4 Remove the hexagonal nut [F] on the phone type in-
put connector. The INPUT assembly can then be re-
moved. (Photo. 5)
5-5 Remove the three (3) screws marked [G] and remove
the case PWB. (Photo. 3)
The Input circuit board can then be removed.
* The case PWB is not a component of the INPUT cir-
cuit board. When replacing the INPUT circuit board,
remove the case PWB and reuse it.
5. INPUTシート(所要時間:約3分)
5-1 リアパネルAss’yを外します。3項参照)
5-2 [110]のネジ4本と[115]のネジ1本を外します。
(図 3)
5-3 LEVELつまみと[Eの六角ナットおよび[D]のワッ
シャを外します。(図 3、写真 5
5-4 フォーンタイプ入力端子の六角ナット[Fを外し
INPUT Ass’yを外します。(写真 5)
5-5 [G]のネジを3本外してケースPWBを外し、INPUT
シートを取り出します。(写真 3)
ケースPWBはINPUTシートの構成部品ではありませ
ん。シート交換時には、取外して使用してくださ
い。
HS50M
4-3 IC801とIC802のパターン側のハンダ22カ所)を外し
ます。(写真 1)
4-4 [A]のネジ2本を外し、放熱板(IC801、IC802付)を外
します。(写真 1)
[B]のネジ2本を外し、IC801とIC802を外します。
(写真 1)
4-5 [C]のネジ4本を外し、AMP取付金具を外してAMP
シートを取り出します。(写真 1)
[A]
[A]
[C]
[C]
[C]
[C]
[B]
[B]
IC801
IC801
IC802
IC802
AMP mounting BRACKET
AMP取付金具)
AMP mounting BRACKET
AMP取付金具)
AMP mounting BRACKET
AMP取付金具)
AMP mounting BRACKET
AMP取付金具)
HEAT SINK
(放熱板)
HEAT SINK
(放熱板)
AMP Circuit Board
AMPシート)
AMP Circuit Board
AMPシート)
PLATE
(絶縁シート)
PLATE
(絶縁シート)
INPUT Circuit Board
INPUTシート)
INPUT Circuit Board
INPUTシート)
CASE PWB
PWB)
CASE PWB
PWB)
Photo. 1(写真 1
<AMP Unit>
<AMPユニット>
Photo. 2(写真 2)
<INPUT Assembly>
<Input Ass’y>
4-3 Unsolder soldered parts (22 locations) on the pat-
tern side of IC801 and IC802. (Photo. 1)
4-4 Remove the two (2) screws marked [A] and remove
the heat sink with IC801 and IC802. (Photo. 1)
Remove the two (2) screws marked [B] and remove
IC801 and IC802. (Photo. 1)
4-5 Remove the four (4) screws marked [C], remove the
AMP mounting bracket. The AMP circuit board can
then be removed. (Photo. 1)
Photo. 3(写真 3
[G]
[G]
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