Service Bulletin - MCi JH-400B Series Technical Manual

SERVICE BULLETIN
BULLETIN NO
I
_4_0_3 - - -
DATE
MAY
24, 1976
P.C. BD.
I/O module
No,43C95
ECO
NO.__.l'--8_6 _ _ _ _ _ _ IN NEW PRODUCTION
May
14, 1976
DESCRIPTION:
Change the following component values:
COMPONENT
Rl6
Rl9
Rl09
REMOVE Rll2
OLD VALUE
lk
33k
lOk
680
ohms
NEW VALUE
47k lsw 5%
3k
~w
5%
680 ohms lsw
5%
FOR PHASE REVERSE OPTION, rewire phase reverse switch as shown
below:
BLU/WHT
YEI/WHT
Q
GRN/WHT
REASON FOR CHANGE:
To achieve better signal-to-noise ratio. This change restructures
the gain of the Fader Buffer, and achieves a 5 dB improvement •
. COMPONENT REQUIREMENT
FOR EACH I/0 MODULE:
(1)
47K
~w
5%
(1) 3K ~w
5%
(1) 680
ohm ~
5%