Appendix
A
MANUAL CHANGE INFORMATION
INTRODUCTION
This appendix contains information necessary to
backdate the manual to conform with instruments using
an older pcb assembly. To identify the pcb used in your
instrument, refer to the revision letter marked in the
upper right
-
hand corner on the component side of the
pcb. If your instrument revision letter is G, this manual
applies directly.
NEWER INSTRUMENTS
As changes and improvements are made to the
instrument, they are identified by incrementing the
revision letter on the pcb assembly. These changes are
documented on a supplemental
changelerrata sheet
which, when applicable, appears at the front of the
manual. If your manual requires a
changelerrata but
does not contain one, contact your nearest sales repre
-
sentative. Be prepared to provide him with the revision
letter of your instrument.
OLDER INSTRUMENTS
To backdate this manual to conform with earlier
revision
-
letter instruments perform the changes indicated
in Table 1. Make the changes in the order given.
1
able
1.
Backdating
Requirements
TO CHANGE MANUAL PERFORM
FROM
REV
G
TO: CHANGES
B
5,
4,
3,
2,
1
C
5,
4,
3,
2
D
5,
4,
3
E
5,
4
F
5
.
CHANGE #1
Reference designator drawing was corrected. No manual
change is required.
CHANGE
#2
Bill of materials was updated to include 50 Hz
components;
i.e., metric fuse, fuse contact (J5), crystal
(3.2 MHz). No manual change is required.
CHANGE
#3
In Section 6,8020A PCB Subassembly parts list, Table 5-
3, make the following changes:
-
Change resistor R8 from 220k f5%, 114 W;
160937;
CG2245 to 180k
f
5%, 1 /4W; 193441; CG2245.
-
To crystal Y1 add the following alternate
description and part no. for use in units designed for 60
Hz environments.
Crystal, 3.84 MHz (60 Hz); 447615; 89536; 447615
On the
8020A schematic, Figure 7
-
1, change the value of
resistor
R8 from 220k to 180k.
In Section 3, paragraph 3
-
9, A/
D
Converter, indicate the
use of one
-
of
-
two crystals; 3.2 MHz for 50 Hz
environments and 3.84 MHz for 60 Hz environments.
CHANGE
#4
In Section 5, Table 5
-
3, the part number for R2 was
changed from 44683 1 to 474080. The value of R2 was not
changed. no manual change is required.
CHANGE
#5
In Section 5, Figure 5
-
1, delete capacitor C12.
In Section 5, Table 5
-
3, delete reference designator C12
from C7, C12. Also change the total quantity from 2 to 1.
In Section 7, Figure 7
-
1, sheet 1 of 2 and 2 of 2, delete
capacitor
C12.
To Next Page
Loading...
