Minolta X-300 - Page 39

TROUBLE-SHOOTING
1. Use of Trouble-shooting
1.
This
trouble-shooting
chart
describes
symptoms
and
causes
of
troubles
found
on
the
camera
2.
side.
Even when trouble is found on the camera side, its cause is not always attributable to
the malfunction of the camera in relation to the exchangeable lens, winder, motor drive
and exclusive flash. Therefore, use this trouble-shooting chart upon confirmation of trouble
on the camera after checking combined performance with the accessories according to
claim contents.
2. Description
1. Trouble described here is due to a single case only. Trouble due to a plurality of causes
should be checked collectively on the basis of the causes listed in this chart.
2. This trouble-shooting deals mainly with electrical causes, as well as covering part of
3.
Li
2.
Bis
on
4.
4-1,
1.
mechanical causes.
Servicing Precautions
Type 2507 digital multimeter is basically used for measurement. Any other kind of meas-
uring instrument, however. may be used, if its minimum input impedance is more than 1OMQ.
Use this tester for voltage checks and a tester of less than 3 V for measuring conduction.
Trouble is most unlikely to occur in electronic parts, such as [Cs, dicdes, transistors.
resistors, and capacitors. Therefore, check the cause of trouble. with the focus on the
defective soldering of lead wires and electrical parts. and switching contacts.
. When checking soldered or plated parts. avoid pressing the parts or pulling lead wires
unnecessarily.
. Since voltage measuring parts are narrow, mount a pin or something similar at the tip of
an alligator clip for measurement.
. When measuring switching patterns, special care should be taken so that the patterns
outside switch operation are free from flaws. For switch contacts. measure their base,
which is not directly affeeted by contact pressure.
. Be sure to turn off the power switch before removing electrical parts (when a constant-
voltage regulated power supply is used).
. The ideal temperature range for the soldering iron tip is 200°C to 34U"C. If the tempe-
rature
is
higher,
however,
perform
soldering
quickly.
Also.
be
sure
to
clean
the
chip
when
soldering.
Description on Trouble-shooting Table and Trouble-shooting
Chart
Trouble- shooting Tabie
From symtom, trouble cause can be found.
2.
The
Trouble-shooting
Table
combines
the
“INDEX”
and
summary
of
details
of
“Trouble-
shooting Chart.
Accordingly, use those properly as the needs of the case demand.
4-2 Trouble- shooting Chart
L.
The
chart
presents
the
checkpoints
to
he
followed
from
the
symptom
to
finding
the
cause
2.
of trouble.
The
voltage
for
each
checkpoint
is
the
value
when
SW.
or
SW,
is
ON
upon
completion
of
film
winding
(before
releasing).
It
is
a
potential
difference
from:'—
of
power
supply.
-
For
all
trouble
symptoms
other
than
“Electromagnetic
release
does
not
operate,”
check
their cause, assuming that the electromagnetic release operates properly.
.
The
chart
shows
the
check
in
the
.
.
is
done
by
uperation
and
in
the
(CJ
by
measure-
ment.