COMPONENT MAINTENANCE MANUAL
IN 1502H RADAR INDICATOR
TM109102
6-7
May/01
d. The specification of the hardware board (200-).
In the example, the items marked “C” in the right margin are all programmable
device assemblies which fulfill the software requirements.
4. Definition of a Hardware Board
The hardware board (200-) bill of materials contains two categories of items that
relate to programmable devices.
a. The non-software programmable device sets (126-) that fulfill hardware
requirements (Items D1 through D4 in the example).
b. The references to all of the programmable devices (122-) on the board. These
references resolve device location on the board in that they use the SYMBOL field
of the bill of materials to specify component location. These 122- numbers are of
the form 122-3XXXX-9999 or 122-0YYYY-9999.
The 122- numbers of the form 122-3XXXX-9999 are used for non-software
programmable devices (126-) that fulfill hardware requirements and therefore these
programmable device sets appear on the hardware board (200-) bill of materials
(Items D5 through D10 in the example).
The 122- numbers of the form 122-0YYYY-9999 are used for both software
programmable devices (125-) (Items D12 through D15 in the example) and
non-software programmable devices (126-) (Item D11 in the example) that fulfill
software requirements.
These programmable device sets appear on the hardware/software board (205-) bill
of materials.
The exact programmable device (the resolution of the -9999 in the above items) is
specified by the respective software programmable device set (125-) or the
non-software programmable device set (126-) bill of materials.
Using the SYMBOL field as specified above would discourage the use of the
SYMBOL field for this purpose in the programmable device sets (125- and 126-) bill of
materials. This would then permit the specification of the same programmable device
sets in different boards, hence different component designators.
In the example, Figure 6-1:
The items flagged D1 through D4 in the right margin are non-software programmable
device sets. The items flagged D5 through D10 in the right margin are non-software
programmable device designators that fulfill hardware requirements. The item flagged
D11 in the right margin is a non-software programmable device designator that fulfills
software requirements. The items flagged D12 through D15 in the right margin are
software programmable device designators that fulfill software requirements.
The document reference is online, please check the correspondence between the online documentation and the printed version.
