AMSTRAD PC1640 Service Manual page 16

V
Is
termination
resistor correctly
attached?
NO
Mount
correctly
YES
1_
Is
environment
condition appropriate?
YES
1_
NO
^>
Set up environmental
condition appropriately
Are
errors
caused
after
changing
to
another
medium?
NO
Medium may
be
faulty
YES
Is
a very
large
noise source
present?
YES Remove
noise
source
NO
1
Is
thefe
sufficient
head
head pressure
NO
M
Change head
YES
A.
Are errors
caused on
inner
circumference
of
tracks?
NO
Is
index
signal correctly
sent?
.
•
*
Y
\
ES
I
NO
Is
azimuth
azimuth
Tilting of
guide shafts
due
to
shock, or
heads
are defective
YES
Is
seek
operation
normal?
NO
-5*
Check
step
motor and
driving
mechanism
YES
Is
time margin
of
inner
circumference
tracks sufficient?
YES
A
*
i
NO
YES
\y
Change
the printed
circuit
board.
Change
the
head
if
problem
is
not solved.
Is
power
NO
Check power
ripple
noise
correctly
fed?
Check data separator
on
system
side
YES
J±
Check
circuit
(Read errors are
caused)
16