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Technics SE-CH505A - Disassembly Instructions (Continued - Main PCB, ICs, Foot); Main P.C.B. Removal; Power IC;Regulator Transistor Removal; Main P.C.B. Checking

Technics SE-CH505A
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SE-CH505A
SE-CH505A
B
NOTE
elnsert
the
projection
on
the
angle
Projection
into
the
hole
of
the
bottom
board
ass’y
and
then
install
the
Main
Qy
[Bottom
view]
Removal
of
the
Fan
Ass’y
Fan
ass'y
Procedure
18-14
CN501-1
/CN501-2
/CN501-3
Bottom
board
Boss
Fan
case
ass'y
peat
5
Fig.
4
ig.
1.
Remove
4
screws
(@~@).
3.
Lift
the
main
P.C.B8.
off
the
retention
post
on
the
bottom
;
.
9.
Raniove
7
aiden
he
CN501-2,
CN501-3,
board
ass'y.
P
;
2.
Insert
a
screwdriver
at
the
root
of
the
fan
(shown
in
Fig.
2).
CN502-1,
CN502-2,
CN703-1,
CN703-2).
4.
Remove
the
main
P.C.B.
in
the
direction
of
the
arrow.
Fig.
7
8.
Remove
the:cap
(shown
if:
Fig.
8).
od
4.
Remove
the
motor
from
the
fan
case
(shown
in
Fig.
4).
=
lof
the
P
jeune
5.
When
mounting
the
motor,
align
the
boss
of
the
fan
case
Ref.
No.
emoval
of
the
Power
iC
an
Ref.
No.
F
1.
Release
3
claws
(shown
in
Fig.
1).
with
the
hole
of
the
motor
(shown
in
Flg.
5).
Regulator
Transistor
13
How
to
check
the
Main
P.C.B.
When
checking
the
soldered
surfaces
of
Procedure
Procedure
|
°""
9
e
Replacement
of
the
Foot
main
P.C.B.
and
replacing
the
parts,
do
as
p
Heat
melted
posts
1637-811
16-813
‘eho
eae
r
i.
Remove
the
4
heat
melted
posts
on
the
bottom
board
:
ass’y
with
a
pair
of
nippers
or
similar
tool.
2.
To
replace
the
foot
(RKA0011A-2)
on
the
bottom
board
ass'y
melt
the
4
posts
with
a
soldering
iron.
312
Foot
Bottom
board
ass'y
S0!dering
iron
Foot
Regulator
transistors
(RKA0011A-2)
m
Power
Source
ON/OFF
of
This
Unit
SE-CH505A
1.
Connect
the
AC
power
cord
of
this
unit
to
an
AC
outlet
and
turn
it
on.
@
When
mounting
the
power
IC
or
regulator
transistor,
apply
(This
unit
comes
to
stand-by
mode.)
silicone
compound
(RFKX0002)
to
the
rear
side
of
power
2.
Make
test
point
TP701
(UGZik))
short
as
shown
in
Fig.
1.
IC
or
regulator
transistors.
1.
Remove
4
screws
(@~@).
POWER
indicator
lights
and
this
unit
comes
to
power
ON
mode.
1.
Unsolder
the
power
IC
or
regulator
transistors.
2.
Remove
3
screws
(@~®).
<7
e
Operation
Check
1.
Set
this
unit
to
power
ON
mode.
;
CN502-2
2.
Input
a
signal
(1kHz,
100mV)
to
the
section
3
between
the
resistor
R217
(LINE
IN
for
Lch)
and
CN501-2
CN502-1
the
jumper
J93
(LINE
IN
GND)
as
well
as
the
:
CNS01-1
section
between
the
resistor
R218
(LINE
IN
for
Reh)
and
the
jumper.
Resistor
(R217)
3.
Connect
the
speaker
to
the
speaker
terminals
and
check
if
it
sounds
from
the
speaker.
alt
Jumper
(J93)
==
Resistor
(R218)
(LINE
IN
GND)
GND
terminal
Bottom
board
assy
Bottom
board
ass'y
(LINE
IN
for
ch)
Spankar
Terminal
;
Fig.
1
2.
Lift
the.
main
P.C.B.
off
the
retention
post
on
the
bottom
4.
Connect
the
GND
terminal
to
the
bottom
board
ass'y
by
board
ass’y.
the
lead
wire.
3.
Remove
the
main
P.C.B.
in
the
direction
of
the
arrow.
-11-
.
-12-

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