JRC NDR-91 User Manual

6.
MAINTENANCE
6.1
GENERAL
Circuits
are
mounted
on the
plug-in
type
PC
board,
excluding the
power
supply
section,
panel
section
and VCO
(CGA-
I
2), thus
facilitating
repair and replacement
of defective
sections.
The
special
tools
(option)
are
available
for removing
plug-in
type
PC
board.
But
when
the special
tools
are not
available,
remove the
PC
board
with
picking
up the both
ends
of the
upper side
of the
PC board with
the long nose
plyers,
etc.
At this time, be sure
not
to damage
the
PC
board
and
aluminum
part
of the
main
frame.
The
panel
unit is coupled
with
the chassis through
three connectors
and
hence de-
mountable
with
ease.
This
receiver
can be
taken
to the
following
pieces;
PC
board
unit, top cover, bottom
cover,
handles
attached
to the
right
and
left
sides
on
the
front, front
panel
and
main chassis.
It
is
essential
for keeping
the
equipment always
in
the
best
operating condition
and
performing
the
proper
maintenance
and check
to know
the basic
operating
principle
and
correct
operating
condition
of the
equipment,
ordinarily.
6.2
GENERAL
MAINTENANCE
AND CHECK
Table 6.1
shows
the
general
maintenance and
check
using
tester
and some
tools.
Table 6.1
Maintenance
and
Check
No.
Item
Maintenance
and check
I
Cleaning
For
cleaning
the
panel
surface,
knobs,
switches,
top
cover
and
bottom
cover,
wipe
off
the stain
with
a soft
cloth
or
silicon
cloth.
For the inside
of the set,
remove
the dust with
a brush
or
cleaner.
Since
no
gear
is equipped,
lubrication
is not
required.
2
Looseness
of
parts
Check
whether
screws
and
nuts
are
loosened,
knobs,
switches
and
volumes
are
loosened,
connectors
are
loosened
relays and
ICs are
inserted
into sockets
surely,
or
not.
Fasten
them
firmly
and
attach
them surely.
3
Fuses
When
fuses for the
power
supply
blow,
check
the cause
careful-
ly and
replace them.
l-ampere
glass-tube
fuse
is
used
for AC
power
and
3-ampere
glass-tube
fuse for DC
power (included
in the spare
parts
set)
4
Printed
circuit
board
Remove
the
plug-in
type
printed
circuit
board
from the
main
chassis
and
check whether
the
parts
mounted
on
the
PC
board
discolor
or are
burnt or
not.
When
replacing
parts,
use
the
spare
parts.
When replacing
the
part
excluded
in
the
spare
parts,
give
an
order
for
parts
to
the sales
agent
or service
station
of
JRC.
5
DC
voltage
Check
the
DC voltage of
means
of
the tester.
The
+5V.
the
POWER
unit
(CBD-351)
by
standard
values are
+17V,
+15V
and
-19-

JRC NDR-91 Specifications

General

Brand	JRC
Model	NDR-91
Category	Receiver
Language	English