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A15 Graphics Proces
-
sor PCB Assembly
This PCB assembly contains circuitry that simultaneously drives both the
internal VGA monitor and an external VGA monitor (if used), as follows:
q
It receives measurement and display information from the A9
Main Processor PCB and generates screen display (video) infor
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mation.
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Provides interface and control for the internal VGA Monitor As
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sembly.
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Provides interface for an external monitor via the rear panel
VGA Out connector.
A16 Hard Disk PCB
Assembly
The PCB assembly contains a pre-formatted hard disk drive assembly
and associated interface circuitry. The A16 PCB interfaces directly with
the A9 Main Processor PCB via the (A9) SCSI interface.
Floppy Disk Drive
Assembly
This unit is a standard 1.44 MByte DOS compatible format floppy disk
drive. It is physically mounted to the test set tray (not to the Front
Panel Assembly). It interfaces to the system via the A13 I/O Inter-
face #1 PCB.
A24 VME Bus
Terminator PCB
This PCB assembly terminates the VME bus to insure stable digital
data transfer on the bus. It plugs into the VME bus structure on the
bottom surface of the A17 Motherboard Assembly.
7-5 MAIN CHASSIS
ASSEMBLIES
The assemblies described below are the major assemblies mounted to
the basic frame of the 373XXA.
A17 System Mother
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board Assembly
The motherboard assembly provides signal routing and D.C. power
distribution paths for all major PCB assemblies of the Analog Subsys
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tem (A1 – A8) and the Digital Subsystem (A9 – A16). It also contains
the VME Bus, Quiet Bus, and A/D Bus structures and other signal
routing paths. It does not contain any active components.
NOTE
The motherboard assembly is an integral part of the
373XXA chassis. It is not a field replaceable unit.
Front Panel Assembly The Front Panel Assembly consists of the following assemblies and
parts:
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A19 Front Panel Switch PCB – this assembly contains all of the
front panel switches for the 373XXA VNA.
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A20 Front Panel Control PCB – this assembly contains the de
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code logic for the switches located on the A19 Front Panel Switch
PCB. This PCB interfaces with the A14 I/O Interface #2 PCB As
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sembly.
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Front Panel LEDs, beeper, keys, controls, and connectors
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Front panel overlay
MAIN CHASSIS ASSEMBLIES SYSTEM DESCRIPTION
7-16 373XXA MM