Denon DRM-550 User manual

DENON
SERVICE MANUAL
MODEL
DRM-550
STEREO
CASSETTE
TAPE
DECK
TABLE OF CONTENTS
OPERATING INSTRUCTIONS...
DISASSEMBLY INSTRUCTIONS .
ADJUSTING AND CHECKING THE MECHANISM SECTIO!
ADJUSTING THE CHECKING THE ELECTRICAL SECTIONS.
BLOCK DIAGRAM
LEVEL DIAGRAM...
PARTS LIST OF EXPLODED VIEW
EXPLODED VIEW OF CHASSIS AND CABINE
CASSETTE MECHANISM UNIT.........
KU-9336 AUDIO P.W.B. UNIT ASS’'Y
KU-9337 DISPLAY P.W.B. UNIT ASS'
KU-9338 POWER P.W.B. UNIT ASS"
NOTE FOR PARTS LIST...
PRINTED WIRNING BOARD PARTS LIS)
BUNDEL DIAGRAM
WIRING DIAGRAM
SCHEMATIC DIAG!
SEMICONDUCTOR...
24,
2!
NIPPON
COLUMBIA
CO.
LTD.

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SONVNALNIVA

DISASSEMBLY
INSTRUCTIONS
i
1.
a)
(2)
3)
(a)
(5)
How
to
Remove
the
Front
PANEL
A’ssy
Remove
the
six
screws
(4X
10CBTS(P)-8)
(104)
in
the
side
of
the
top
cover.
(36).
Move.
the
top
cover
to:
the
rear
and
rise
it
to
remove
it.
Disconnect
all
lead
connectors,
C.MECHA
ERASE
Head
wire
~
CB143
POWER
PB/REC
Head
wire
~
CB141
AUDIO.
CW-283
=
CB253
POWER
DISPLAY.
|
CW121
—
CB121
CW122
=
CB122
AUDIO
VR
CW131
—
CB131
sw
CW-254
~
CB254
POWER
cW191
—
CB191
AUDIO
POWER
{
CW255
=
CB255
C.
MECHA:
Remove
the
Volume
knob
(30).
Remove
the
screw
(3X8CBTS(S)-B)
(101).
Remove
the
two
Hooks
on
the
bottom,
Front
Panel
Ass’y
can
be
removed
towards
the
front.
wt
{|
os
{
FRONT
PANEL
pa
T
2.
3hooks on the bottom
of rear ponet
2hooks on the bottom
of
front panel
oss'y
How
to
Remove
the
Cassette
Mechanisms
Remove
the
four
mechanism
retaining
screws
(3X8CBTS(P)-B)
(102),
and
take
out
C.
Mechanism,
3.
(1)
(2)
(1)
(2)
How
to
Remove
the
Display
P.W.
board
cw251
—
CB251
}
{
CWw252
~
CB252
Remove.
the
seven
Display
P.W.
board
retaining
screws
(SX8CBTS(P)-B)
(102)
and
take
out
the
Display
P.W.
board.
DISPLAY
C.
MECHA
How
to
Remove
the
Cassette
Door
Remove
the
Mini
Damper
(20)
retaining
screw
(3X8CBTS(P)-B)
(102)
and
take
out
the
Mini
Damper
(20).
Hold
the
legs
of
the
CASSETTE
BOX
folded
inwards
and
“pull-up
to
remove
the
CASSETTE
BOX
(18)
and
BOX
SPRING (21).
Front of the
> cassette box
Front
surface
of
front
ass'y
(1)
(2)
(3)
(4)
qq)
(2)
(3)
(4)
7.
(1)
(2)
(3)
(4)
How to Remove the Rear panel
Remove
the top
cover
(36)
and
front
Panel
Ass’y,
(Refer
to
section
1.)
Remove
the
screw
(X8CBTS(P)-B)
(102)
that
is
holding
the
4P
pin
jack.
Remove
the
busing
(7)
(8)
that
is
fixing
AC
cord
from
rear
panel
(9).
Remove
the
three
hooks
on
the
bottom
of
rear
panel
(9)
and
pull
the
unit
back
to
detach
it.
How
to
Remove
the
Audio
P.W.
Board
Remove
the
top
cover
(36)
and
the
front
esc.
Ass'y.
(Refer
to
section
1.)
Remove
the
screw
(3X8CBTS(P)-B)
(102)
that
is
holding
the
4P
pin
jack.
Remove
the
connectors
from
the
audio
P\W,
board
and
power
P.W.
board.
Power
P.W.
board
CW191+CB191_—_audio
P.W.
board
Remove
the
six
screws
(3X8CBTS(P)-B)
(102),
the
audio.
P.W.
board
can
be
removed
by
rising
it.
How
to
Remove
the
Power
Supply
P.W.
board
Remove
the
top
cover
(36).
(Refer
to
section
1.)
Remove
the
busing
(7) (8)
that
is
fixing
AC
cord
from
rear
panel
(9).
Remove
the
connectors
from
the
audio
P.W.
board
and
power
P.W.
board,
Power
P.W.
board
CW191—CB191
Audio
P.W.
board
Remove
the
nine
screws
(4X10CBTS(P)-2)
(103),
(3X8CBST(P-B)
and
(3X8CBTS(S)-B)
(102)
that
are
holding
the
power
transfor-
mer
and
PW.
board.
The
power
PW.
board
can
be
rerhoved
by
rising it.
DRM-550 Be