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Model
5315A/8
Service
6-4
8-21. SERVICE AIDS
8-22.
Pozidriv Screwdrivers
8-23.
Many screws
in the
531SA/B
appear to be Phillips, but are
not.
To
avoid
damage to
the
screw slots, Pozidrive screwdrivers shou ld
be used.
8-24. Service Aids
on Printed
Circuit Boards
8-25.
The
servicing
aids
include
test
points,
transistor
and
integrated
circuit
designations,
adjustment callouts, and assembly stock numbers.
8-26.
Assembly
Identification
8-27.
The
assembly number,
name,
and
Hewlett-Packard
part
number of 5315A/B
assemblies
are listed
in
Table
8-1 and
located
on
Figures
8-5 and
8-6.
Table
8 1
Assembly
Identification
-
Refe rence Designation
Description
HP
Part Number
Al
Motherboard/Power
Supply
Assembly
OS315-60001{A)
OS315-
60008{B)
A2
Display
Assembly
05315-60002
A3
Input
Assembly
05315-60003
A4
Input
Amplifier
Assemb
ly
05315-60004
AS
Support
Board Assembly
05315-60005
A6
Battery
Charger Assembly
05315-60006
A7
TCXO
Assembly
05315-60007
A6
Power Module
(53158)
0960-0443
8-28.
THEORY OF OPERATION
8-29.
Introduction
8-30. The
5315A/
B
is
a
Un
iversa
l
Counter with frequency, period, time
interval,
time
interval
average, ratio,
and totalizing
capabilities. The
basic
functional
operation
centers on
the
Mirco-
computer
(1lC)
as the main cont roller.
Two
additional
lSI
circuits.
a Multiple-Register-Counter
(MRC)
and
a Display
Decoder/
Driver
are
periphera ls to the controller, and
perform
the data
collection
and display functions.
The
folloWing paragraphs describe
the
overall
functional
operation
and
reference
Figure
8-2, Overa
ll
Block
Diagra
m.
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