Model 8903B/E
Service
CHANGES
On the A4 schematic:
0
-
U21A
-
In the upper left hand corner locate U21A pin
13
and delete (Fl) on
the +15V supply line, locate U21A pin 4 and delete
(Fl)
on the -15V
supply line.
0
C32
-
In
the upper portion
of
the A4 schematic under LOW-PASS
FILTERS PASS BAND GAIN-2 add C32
3.3
p in parallel to A4C16.
0
-
C18
-
In the upper portion
of
the A4 schematic under LOW-PASS
FILTERS PASS BAND GAIN-2 change the value of C18 to 91
pF.
0
-
U9A
-
In the upper portion of the A4 schematic under LOW-PASS
FILTERS PASS BAND GAIN-2 locate U9A pin
13
and delete (F2) on the
+15V supply line, locate U9A pin 4 and delete (F2) on the -15V supply
line.
On the Component Locator
0
Ul,U2,U6,U8,U12,U13
-
U1, U2, U6,
U8,
U12
and
U13
are round cans and
the tabs should be in the
2:OO
o’clock position.
0
-
R211
-
On page 8B-114.4, in the lower left hand comer, add R211 between
R209 and R210.
On the Component Coordinates:
0
-
R211
-
On
page 8B-114.3 add R211
A,3,
to the
partial
component
coordinates table.
On the A1
3
schematic:
0
08903-60192
-
Change the part number
of
the
A13
POWER
SUPPLY
AND
MOTHERBOARD ASSEMBLY
to
08903-60192.
On the A4 schematic:
0
08903-60282
-
The 08903-60128 board is obsolete,
to
replace this board you
must order the 08903-60282 (not Quasi- Peak).
-
Note:
-
The 08903-60282 (not Quasi-Peak) and the 08903-60283
(Quasi-Peak) are identical boards except for the positioning
of
W1. See
partial schematic on page 8B-116.5, and the Component Locator on page
8B-
1
14.4.
rev.14FEB89
ss5
8B-114.1
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