PSC 101 - Trouble Shooting; Input Fuse Blows

SECTION 7
TROUBLE SHOOTING
Prior
to
trouble
shooting
the
supply,
it
should
be
returned
to
the
normal
mode
of
operation
as
des-
cribed
in
Section
4,
paragraph
4.1
of
this
manual.
Insure
that
the
patch
pins
are
properly
placed
as
shown
in
Figure
4-1,
and
that
there
cre
no
extra
patch
pins
in
the
Patch
Board
Connector.
If
the
unit
operates
as
it
should
when
it
is
programmed
as
described
in
Section
4,
paragraph
4.1,
return
the
unit
to
the
desired
mode
of
operation
carefully
following
the
Figure
which
describes
the
desired
mode
of
operation.
;
If
the
supply
continues
to
malfunction
check
for
broken
patch
pin
wires
and
broken
wires
within
the
unit.
7-1
LOAD
AND
LINE
REGULATION
OUT
OF
SPECIFICATION:
PROBABLE
CAUSE:
a.
Differential
voltmeter
improperly
hooken
up
.
(see
Section
5)
b.
A.
C.
input
voltage
below
minimum
operating
value.
Check
A.
C.
input
voltage
at
power
supply
input
terminals.
c.
Supply
in
current
limiting
mode.
Check
load
current.
7-2
HIGH
OUTPUT
VOLTAGE:
a. Shorted series regulator transistor.
b. Shorted driver transistor.
7-3 INPUT FUSE BLOWS:
а. Rectifiers may be shorted.
b.
Filter
or
output
capacitors
may
be
shorted
с.
Possible
shorted
turn
in
transformer