4 lm360 comparator related condition, 5 board revisions, upgrades and ecos, 1 modification to mb for 64k cartridges – Fluke 900 User Manual
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Maintenance
FLUKE 900 SERVICE MANUAL
5.4.2.6.4
LM360 comparator related condition
Each pair of columns in the calibration results should differ by no more than 1. As an
example:
. . 1 6 0
n s . .
pin# U-H D-H
U-L D-L
5
-
1
0
+2 +2
Check that (U-H) - (D-H) = Oor +/-1 and
(U-L) -(D-L) = Oor+/-1
If not, the LM360 comparator on this line is faulty and should be replaced. The
calibration procedure should be restarted from the beginning.
5.5 Board Revisions, Upgrades and ECOs
This manual documents aU 900 units with serial number 4720000 and above. Units with lower
serial numbers are documented in a two volume Service Manual (part numbers 859413, 880195).
The boards in such machines are designated IB, MB, Ml, M2 and HI.
The table below lists the boards and ECOs applicable to the 900 revision level described in this
manual.
BOARD
REVISION
PCB#
APPLICABLE ECOs
Interface Buffer
(IB)
300-506C
none
High Speed Board
(HS2)
300-508-2
HS2 has factory-installed ECOs
which make it equivalent to HS3
High Speed Board
(HS3)
300-508-3
none
Micro Board
(MB2)
300-507-2
ECO-016, ECO-018
5.5.1 Modification to MB for 64k Cartridges
ECO-016
This connects the 16th address line to the cartridge port.
Install wire from U9 pin 17 to J8 pin 5.
5 - 1 6