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QUALITY ASSURANCE - - - - - - - - - - - - - - - - - - - - -
for test, experiments, and calculations to confirm
the design changes.
deSign, as described in section 2. Our views on quality
approval are:
(7) Analysis
of
past failures with similar devices, dis-
cussion of methods to prevent them, and planning
and execution
of
test programs to confirm success.
(1) A third party executes approval objectively from
the standpoint
of
the customer.
3. QUAUTV ASSURANCE SYSTEM
3.1 Activity of Quality Assurance
(2) Full consideration is given to past failures and
information from the field.
(3) No deSign change or process change without QA
approval.
General views
of
overall quality assurance in Hitachi
are as follows:
(4) Parts, materials, and processes are closely
monitored.
(1) Problems in each individual process should be
solved in Jhe process. Therefore, at the finished
product stage the potential failure factors have
been removed.
(5) Control points are established in mass production
after studying the process abilities and variables.
3.3 Quality and Reliability Control at Ma ..
Production
(2) Feedback of information is used to insure a satis-
factory level of ability process.
Quality control is accomplished through division of
functions jn manufacturing, quality assurance, and
other related departments. The total function flow is
shown in Fig. 2. The main points are described below.
3.2 Quality Appl'OVl!ll
To insure quality and reliability, quality approval is
carried out at the preproduction stage of device
Step
Contents
t
Terget
I
Design Review
Specification
•
I
Design
Characteristics of Material and
Trial
Material., Parts
II
Parts
Production
Approval
H
Appearance
Dimension
Heat R .. istance
Mechanical
Electricel
Othan
ICharsctarlstlcs Approval
Electrical
Characteristics
Function
Voltage
Currant
Temperature
Others
Appearance, Dimension
I~uality
ApprovaII1J
Reliability T .. t
Life T .. t
Thermal Stress
Moisture R .. istance
Mechanical Stress
Others
19ualit-;«
Approval
~~
Reliability T .. t
~
Process Check .. me ..
Quality Approval
(1)
I=uctlon
I
Figure 1 Flow Chart of
Quality
Approval,
20
Purpo .•
Confirmation of
Characteristics
end
Reliability of Materials
and Paru
I
Confirmation of Tlfllt
Spec. Mainly about
Electrical Characteristics
Confirmation of QUality
and
Reliability In
Delign
I
Confirmation of Quality
end
Rallability in MIll
Production
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