Accuphase E-550 - Service Information (No. E550-003); Subject: Noise Countermeasure for Volume; Details: IC Fault Noise Issue; Preparation Parts: IC and Cool Sheet

TOP VIEW (
上面
)
Mother Board Assembly
ﾏｻﾞｰﾎﾞｰﾄﾞ Ass'y
(716-0729-00)
VI Assembly (Rch)
(713-0013-00)
VI Assembly (Lch)
(713-0013-00)
IV Assembly
(713-0014-00)
Service Information
No. E550-003
Accuphase Laboratory Inc.
Issued 2006- 3-25
MODEL : E-550
SUBJECT :
The measure against a noise in a volume
specification position
.
項目 ： ボリューム特定位置でのノイズ対策
Details ;
The noise by IC fault may be produced in the specific position of
main volume. IC of VI Assembly shown in the figure is exchanged.
See Fig. 2 & 3.
詳細
;
ﾒｲﾝﾎﾞﾘｭｰﾑの特定位置で下記ｼﾘｱﾙのﾛｯﾄでは､
IC
不具合によるﾉｲｽﾞを生じる
場合があります。VI Ass'y の図に示すICを交換します。（図2 ､3 参照）
Fig.1
Fig.2
VI Assembly(713-0013-00)
Fig.3
PreparationParts /
準備部品
(1) IC OPA2228P 8pcs.
for IC6,7,9,10
(2) Cool Sheet 240-3001-04 4pcs.
放熱ｼｰﾄ
This measure performs both channels.
この対策は両チ ャ ンネル行います 。
4 figures of
ends show the
lot of IC.
末尾４桁は､IC
のﾛｯﾄを示す｡
As for 4 figures of ends,"FJ87" has
the possibility of a noise.
It exchanges for IC of a different lot.
末尾４桁が"FJ87"は､他のﾛｯﾄ
のICに交換します｡
OPA2228
P
4AAFJ87
IC10IC7
IC9IC6
STEP
①
STEP
②
Fig.4
A Cool sheet is stuck on IC6 and 7
and IC9 and 10.
IC6,7 とIC9,10に放熱ｼｰﾄを貼り付けます｡
Cool Sheet /放熱ｼｰﾄ
(240-3001-04)
An applicable serial number ；
L5Y001
～
200
該当ｼﾘｱﾙ番号
The expanded figur of IC
IC拡大図
-17-