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Onkyo TX-7230 - Service Procedures; Replacing Fuses; Replacing Lamps; Display PC Board Removal

Onkyo TX-7230
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SERVICE
PROCEDURES
1.
Replacing
the
fuses
For
continued
protection
against
fire
hazard,
replace
only
with
same
type
and
same
rating
fuse.
Circuit
no.
Partsno.
Description
F501,
F601
252076
3.15A-SE-EAK,
Primary
F902
252074
2A-SE-EAK,
Primary
F903,
F904
252078
5A-SE-EAK,
Secondary
F905
252070
1A-SE-EAK,
Secondary
‘2.
Replacing
the
lamp
This
unit
uses
the
lamp
listed
below.
Circuit
no.
Partsno.
Desciption
PL901
210064A
PL
6.3V,
250mA,
Dial
plate
illumination
3.
Removement
of
display
pc
board
@.
Remove
the
five
screws
holding
the
top
cover
and
chassis
(side
bracket:4
back
panel:
1),
and
remove
the
top
cover.
Remove
the
five
screws
holding
the
front
panel
and
front
bracket,
and
remove
the
front
panel.
Remove
the
two
screws
holding
the
switch
pc
board
and
front
bracket,
and
remove
the
switch
pc
board
of
U4.
Remove
the
four
screws
holding
the
holder
and
front
bracket.
Remove
the
display
pc
board
ass’y
from
the
four
nails
of
holder,
and
remove
the
holder.
Remove
the
two
knobs
(A805).
Remove
the
two
screws
holing
the
NAAF—2306
pc
Board
ass’y
and
center
bracket,
and
remove
the
NAAF—2306.
©
e
SO:
2.
@
dynamic
bass
expander
and
front
bracket,
and
remove
the
display
pce
board.
4.
Memory
Preservation
This
unit
does
not
require
memory
preservation
bat-
teries.
A
built-in
memory
power
back-up
system
preser-
ves
contents
of
the
memory
during
power
failures
and
even
when
the
unit
is
unplugged.
The
unit
must
be
plug-
ged
in
and
the
power
switch
turned
on
and
off
once
in
order
to
charge
the
back-up
system.
Note
that
since
this
is
not
a
permanent
memory,
the
power
switch
must
be
turned
on
and
off
a
few
times
each
month
to
keep
the
back-up
system
operable.
The
period
of
time
during
witch
memory
contents
are
preserved
after
power
has
last
been
turned
off
varies
depending
on
climate
and
the
location
and
placement
of
the
unit.
On
the
average,
memory
contents
are
protected
over
a
period
of
3
to
4
weeks
(a
minimum
of
2
weeks)
after
the
last
time
power
has
been
turned
off.
This
period
is
shorter
when
the
unit
is
exposed
to
very
high
humidity
or
used
in
an
area
with
an
extremely
humid
climate.
Remove
the
two
screws
holding
the
switch
of
F501
F601
Speaker
protection
fuse
F902
F904
F903
:
<G/W>
Pri.
=
TES
il
il
<G>
F901
<pjw>
F905
<G>
Second.
-
a7
A16
“n805)i
\
A805)ago6)
Jt
—
(ur
27
G28)

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