Magnavox CDB472 User manual
(
(_
Manual No. 5373
CONSUMER
ELECTRONICS
CORP
A North American PHILIPS Company
Magnavox Model: CDB472
Chassis CD4
72/11R
Product Services
Technical Publications Dept.
P.O.
Box 555, Old Andrew
Johnson
Hwy.
Jefferson City,
TN
37760 - - - ---- -
--=
-----
--
-
------
--
For replacement purposes the remote control
is
available undercode number4822
218
20684
-------
-
For repair
of
the CD mechanism refer
to
Service
Manual CDM·21 version 0500.
erviceManual
When ordering replacementparts change
4122
to
4H
and
5322
to
5H
CONTENTS
Explanation
of
subdivision and table
of
contents per
page
2 Controls and technical specifications
3 Servicing hints
4 Measurements and adjustments
5 Exploded vieuws and parts lists
of
mechanical
components
6 Block diagram, circuit diagrams,
PCB
data, parts lists
of
electrical components and wiring diagram
7 Remote Control
8 Changes
9 Additional information
Safety regulations require that the set
be
restored
to
its original
condition and that parts which are identical with those specified
be
used.
(ru
□
~@
IIIIGffllLAUDIO
Copyright november 1987 N.A.P. Consumer Electronics Corp. Magnavox -Knoxville, Tennessee 37919
Subject
to
modification
4822 725 50835 cs 12 212
1-1
1.
EXPLANATION
ON
THE
LAYOUT
OF
THE
DOCUMENTATION
The
documentation consists
of
chapters.
The
number
of
the
chapter
is
indicated
by
the
first
digit
of
the
page number.
The
second digit
of
the
page number
is
the
sequence
numbering.
If
modifications
or
supplements require
new
supplementary
or
replacement pages,
the
page number
is extended with a third part:
A
digit
behind
the
page number indicates
that
it
concerns
a supplementary page.
A replacement page is indicated by a letter behind
the
page
number.
TABLE
OF
CONTENTS
PER
PAGE
Chapter
Page
Contents
Example
3-6
3-6-1
3-6-a
1 1-1 Explanation
of
the subdivision
of
the
documentation
Table
of
contents
per
page
2
3
4
5
2-1
2-2
3-1
3-2
4-1
4-2
4-3
4-4
4-5
4-6
4-7
4-8
5-1
Controls
Technical specification
Servicing hints
Disassembly
of
top
cover
Servicing
of
front
panel
Servicing
of
tray
mechanism
Disassembly
of
CDM
Servicing
of
servo +
decoder
panel
Replacement
of
transformer fuse
Electrical measurements and adjustments
General checkpoints
General checkpoints
Detailed measuring method
Detailed measuring method
Detailed measuring method
Detailed measuring method
Detailed measuring method
Detailed measuring method
Exploded view tray mechanism
Partslist
of
mechanical components
is page 6
of
chapter 3
is a supplementary page behind page
3-6
is
the
replacement page
of
page 3-6
(so page 3-6 can
be
removed from
the documentation).
6 5-2
6-1
6-2
6-3
6-4
6-5
6-6
6-7
6-8
6-9
6-10
6-11
Exploded
view
of
cabinet+
parts list
of
cabinet components
Block
diagram
CS
11
944
GB
Wiring diagram
Circuit diagram
of
the
servo
Circuit diagram
of
decoder 1
Drawing
of
the main panel
Drawing
of
the main panel
Circuitdiagram
of
decoder 2
Circuit diagram
of
the
power
supply
Drawing
of
the
control
and
display
panel
and
its
circuit diagram
Electrical partslist
Partslist lead-less components
..
C
(
(
(
(
1
7 8
a b
2. CONTROLS
1 "ON/OFF" key: for switching the player on and off.
2 Display: functions as
on/off
indicator; gives information
about the number
of
tracks
on
the disc, the playing
time, the progress
of
play and particular functions
of
the player, and signals any faults occurring during
operation
or
programming.
3 Remote eye: for receiving the signals from the remote
control handset.
4
"<l<l
SEARCH
t>I>"
keys:
for
fast search
to
a particular
passage
(<l<l
backwards
t>!>
, forwards).
5 "PLAY/REPLAY" key: for starting play ("PLAY") and
returning
to
the beginning
of
a track ("REPLAY").
6 "STOP/CM" key:
for
stopping play during playback
("STOP") and for erasing a programme (CM = Clear
Memory).
7 "PHONES" socket:
for
the connection
of
a headphone
tor
listening
to
discs without using an amplifier.
8 "OPEN/CLOSE" key: for opening and closing the disc
tray.
2-1
2 3 4 5 6
9
10
11
12
13
14
C
42 452
0,2
9 'TRACK/TIME" key: for switching from track number
to
playing time indication and vice-versa.
10 "PROGRAM" key: for storing the track numbers
of
a
programme and producing the display
of
the
programme stored.
11
"PAUSE" key: for holding play at the start of a track
or
passage and for interrupting play.
12 "REPEAT" key: for repeating a disc
or
a programme.
13 " Kl INDEX
t>t
" keys: for indicating the index number
you want
to
begin with ( Kl " from index number
99
to
index number
01
and"
t>t
from index number
01
to
index number 99); also for returning to a previous
index number
or
moving on
to
a later one during play.
14 "PREVIOUS/NEXT' keys:
for
indicating the track
number you want
to
begin with, and selecting track
numbers when compiling a programme (
<J
from high
to
low and
I>
from
low
to
high); also for returning
to
a
previous track number or moving on
to
a later one
during play.
a.
Out
for
the signal output cable
to
the amplifier.
b.
RCS
in/out:
for
a separate receiver for the signals
from the remote control handset.
c. Connections for the mains lead.
CS
11
945
t:3B
2-2
TECHNICAL SPECIFICATION
• System
• Malnsvoltages
• Mains frequencies
•
Power
consumption
• Frequency range
• Output voltage
• Output impedance
•
S/N
ratio
• Chanell separation
SERVICE AIDS
Audio
test
disc
Disc without
errors+
disc with DO errors,
: Compact Disc Digital
Audio system
: 110 V,
127
V,
220
V,
240
V
±
10%
(to be changed by
transformer connections)
: 50-60
Hz
(no adaption
required)
:
14W
: 2 Hz +
20
kHz ± 0,05
dB
: max. 2 V
,mJ;;;,,
10 kOhms
: 200 Ohms
:
;;;,,96
dB
: ;.,.93 dB
4822
397
30085
black
spots
and
fingerprints
Torx
screwdrivers 4822 397 30096
4822
395
50145
4822
395
50132
4822
395
30204
4822 321 21284
4822
322
40066
4822 267 50676
5322 130 32182
Set
(straight)
Set
(square)
13th
order filter
Service cable (4-pole)
Service cable (14-pole)
Service connector (14-pole)
Green LED CQYG II
cs
12213
• Total harmonic
distortion
• Intermodulation
distortion
• Remote control
• De-emphasis
• Dimensions wxhxd
• Weight
• Headphone
:
...;0,003%
(-90 dB}
:
os;;;0,003%
(-90 dB)
: Cinch
bus
for
RC5
system
: 0
or
15/50
µs (switched
by the subcode
on
the disc)
: 420 x
86
x 300
mm
(tray closed)
420 x 86 x 425
mm
(trayopened)
: approx. 3
kg
-Output voltage : max.
5.6
Vrms
-Output impedance : 150 0
-Load Impedance range: 8 O - 2
k.O
-Output power :
30
mW
at
32
n
C
C
(
(
3-1
3. SERVICING HINTS
J.
ESD~
In
the
set
chip components have been applied.
Alie
ICs
and
many
other
semi-conductors are susceptible
to
electrostatic discharges
(ES
□).
For
disassembly and assembly
of
chip
components see
the
figure below.
For
measurements and adjustments
it
is
possible
to
position
the
working mechanism
outside
the
set.
Careless handling during
repair
can
reduce
life
drastically.
To
do
this
work
the
following service aids are available:
When
repairing,
make
sure
that
you
are connected
with
the
same potential
as
the
mass
of
the
set
via a
wrist
wrap
with
resistance.
-Service flat cable (14-pole) 4822
322
40066
-Service
connector
(14-pole) 4822 267 50676
These
two
items should
be
used
to
assemble
an
extension calbe between
connector
11
and
the
flex
cable
of
the
CDM-2 unit.
Keep
components and
tools
also
at
this potential.
The
disc
should always
rest
properly
on
the
turntable.
To
achieve this a
disc
hold-down
has
been mounted in
the
cover. Remark:
The
service cable should be assembled
as
follows (see drawing
MDA
00311).
When
the
cover
has
to
be taken
from
the
set
for
repair, a
separate hold
down
should
be
used.
The
14-pole connector
should
be soldered
as
Indicated In
the
drawing. Please remove
the
blue
tape
of
the
rear
of
the
service
flat
cable-end
which
has
to
be connected
to
connector
11.
Switch
SK2
has
to
be activated.
The
set
can
be
used normally.
GENERAL
CfilP
SO
LO
ER
COMPONENT SOLD
ER
,)'J l
Ql'c~o;:eRTRACK
GLUE
SERVICE PACKAGE
DISMOUNTING
VACUUM PISTON
SOLDERING
~2
IRON~
o g. WELLER
~~~=~~
SOLOEA
TIP
PT-H7
OR
SOLOERING
IRON~
SOLDER
WICK
4s22
32~
400•2q...,..__,.....I
l
COM FLEX-CABLE
4822 267 50676
SOLDER JOINT
4822
322
40066 MDA.00311
T19-730
MOUNTING
e.g. A
PAIR
OF
TWEEZERS
A
~
SOLDER
00.5-0
.8
mm
PRESSURE
♦
A
8
e.g. A
P~EZERS
B
HEATING~
HEATING
' II
I i
SOLDERING TIME
< 3
3ec/side
SOLDER
0O
.S • 0.8
mm
SOLOEAING IRON
SOLDER
WICK~
CLEANING
PRECAUTIONS
C
EXAMPLES
SOLDERING
IRON
~
~
SOLDERING
IRON
~
~
(?,$,
~~
Fig. 1
21 012c12
CS
11
947G
3-2 ·
DISASSEMBLY OFTOP COVER
-Remove
the
4 screws
out
of
side walls
of
top cover.
-Take
top
cover
from
set.
SERVICING OF THE FRONT PANEL
Disassembly
of
front panel
-Remove
top
cover.
-Remove the 3 fixing screws
at
upperside
of
fornt panel.
-Nowthe
front
panel can
be
taken off.
-Ensure during mounting that the 3 bosses
of
the set
frame engage with
the
appropriate holes
of
the
frontpanel.
Disassembly
of
control+
display panel
-The control and display PCB can be detached by
removing the 7 screws 3Mx16
at
the bottom
of
the
display panel.
-Then the control + display panel can
be
taken
out
of
the front.
-When mounting, make sure that the 3 bosses on the
front slip
into
the appropriate holes in the PCB.
SERVICING OF THE TRAY MECHANISM
-Demounting the tray mechanism.
-Remove the
top
cover.
-Remove the front.
-Push the tray
out
of
the mechanism.
-Remove
the
screw from the bottom
of
the set.
-Undo
the
3 screws with which the loading has been
mounted into the set.
Two
screws are situated in front
and one in the centre
at
the rear.
-Lift the tray mechanism a little and undothe flexible
PCB
from
the connector
by
lifting the upper part
of
the
connector and taking the flexible PCB
out
Short circuit
the connections
by
means
of
a paperclip.
-Undo
the
2 stocko connectors.
-Now take
the
tray mechanism
out
of
the
set.
CS
11
948
GB
DEMOUNTING THE CDM
-Remove the complete disk hold-down.
-Turn
the
loading upside down.
-Support
the
COM.
-Loosen the 2 screws on the metal bracket with which
the
COM
is
suspended.
-The CDM can
now
be
removed.
-
For
servicing the COM see Service Manual
CDM2/0500.
-Mounting is done in reverse order.
SERVICING THE
SERVO+
DECODER PANEL
-Remove
top
cover.
-Remove the
front
panel.
-Remove the tray mechanism.
-Remove the screw with which the chassis part is fixed.
-Remove the screw in the rear with which the CINCH
sockets are fixed.
-Remove
the
2 screws on the PCB.
-Remove
the
screws from the transformer.
-The PCB now can
be
taken out.
-Mounting
is
done in reverse order.
REPLACEMENT OF TRANSFORMER FUSE
-
For
replacing the transformer fuse the transformer
must
be
desoldered from the PCB.
(
C
(
(
(
C
4. ELECTRICAL MEASUREMENTS
AND
ADJUSTMENTS
HINTS
Test
disc
It
is
important
to
treat
the
test
discs with great care.
The
disorders
on
the
discs (black spots, fingerprints, etc.) are
exclusive and unambiguously positioned. Damage
may
cause additional drop-outs, etc. rendering
the
intentional
errors
no
longerexclusive. In
that
case
it
will
no
longer
be possible
to
check
e.g.
the
good working
of
the
track
detectors.
Measurements
on
op-amps
In
the
electronic circuit op-amps have been used
frequently. Some
of
the
applications are amplifiers,
filters, inverters and buffers.
In
those
cases where in
one
way
or
the other, feedback
has been applied
the
voltage difference
at
the
differential
inputs converges
to
zero.
This
applies
to
both DC and
AC signals.
The
cause can
be
traced
to
the properties
of
an
ideal
op-amp
(Z1=
oo,
G =
oo,
20 =0).
If
one
input
of
an
op-amp
is
directly connected
to
ground
it
will be
virtually impossible
to
measure
at
the
inverting and
the
non-inverting inputs. In such cases
only
the
output
signal
will
be
measurable.
That
is
why
in
most
cases
the
AC voltages
at
the
inputs
will
not
be
given. The DC voltages
at
the
inputsare equal.
Stimulation with
"0"
and
"1"
During troubleshooting sometimes certain points should
be
connected
to
ground
or
supply voltage.
As
a result
certain circuit
can
be
brought
in a desired
state
thus
shortening
the
diagnosis time. In a number
of
cases
the
related points are outputs
of
op-amps. These outputs are
short-circuit-resistant, i.e. they can
be
brought
to
"O"
or
ground
without
problems.
The output
of
an
op-amp, however, should never be
connected directly
to
the
power
supply voltage.
Measurements on microprocessors
Inputs and outputs
of
microprocessors should never
be
connected directly
to
the
power
supply voltage.
The
inputs and outputs should only
be
brought
to
"O"
or
ground
if
this
is staed explicity.
Measurements with an oscilloscope
During measurements
with
an oscilloscope
it
is
recommended
to
measure with a 1:
10
test
probe, since a
1:10 probe has a considerably smaller input capacitance
than a 1
:1
probe.
Selection
of
ground potential
It
is
very
important
to
select a
ground
point
that
is
as
close
as
possible
to
the
test
point.
Conditions for injection
-Injection.of le\lels
0r
si_gnals
from an
extemal
source
should
never
take
place'if
ihe
related circuit has
no
supply
voltage.
T<he
,injected ,levels
or
signals·Shol!lld never
be
greater
than
the
supply
voltage
of
the
·r.elated circuit.
4-1
GENERAL CHECKPOINTS
In
the
detalled measuring method below a number
of
general conditioAs, required
for
a properly functioning
set, will
not
be
mentioned. Before
the
detailed measuring
method is started, these general points should
first
be
checked.
a. Ensure
that
disc and objective are clean (remove dust,
fingerprints, etc.)
and
work
with
undamaged discs.
b. Check
if
all supply voltages are present and
if
they
have
the
correct values.
c. Check
the
good
working
of
the
CD
mechanism by
means
of
the
servicing programme.
Indication
of
test
points
In the drawings
of
the
diagrams and
the
panel~e
test
points have been indicated
by
a number(e.g. '(.3/')
to
which the measuring method refers. In
the
measuring
method below,
the
symbol
(◊J
has been omitted
for
the
testpoints indicated.
Initiation
of
the
servicing programme
of
the
µP
-Service position "0"
Press
the
STOP/CM, NEXT and PAUSE keys. Keep
these three keys depressed while switching
on
the
mains voltage. This is
the
1
st
standby position.
The
number
of
the
internal ROM program
of
the
µP (e.g.
P101) appears
on
the display.
The
"TRACK" Led lights
up
as
well. In
this
position
the
radial arm
of
the COM
can be driven Inwards (with SEARCH >
>)
and
outwards
(with < < SEARCH)
with
minimum torque.
When one
of
these search keys
is
actuated, laser
control and focus control become active
as
well.
If
a
disc is
put
on
the
turntable,
the
working
of
the
focus
control can already
be
observed in this position. (It
the
arm moves outwards and inwards, you can hear the
optical pick-up unit
jump
across
the
tracks).
Attention:
After
one
of
these keys (SEARCH >
>,
<<
SEARCH) is pressed, the laser remains controlled
up
to
service position 3. Avoid, therefore, direct
exposure
to
the
laser beam in service positions
0,
1
and 2).
-Service position
"1"
From service position
"O"
the
player can
be
brought
into service position "1"
by
pressing
the
"NEXr
key.
The
indication "0001" appears
on
the
display. In
this
position
the
focus
start
procedure is repeated
over
and
over
again. The lasercontrol
is
active.
However,
this
start procedure does
not
release
the
focus,control. So
we
cannot
ascertain
that
the focal
point
is
found. This position
is
very suitable, however,
tor
measurements
of
the
focus circuit.
In service positions 1 and 2
the
arm
with
the
rafoc
unit can be moved inwards and
outwards
with the
SEARCH >> key and
the
< < SEARCH key
respectively. In this
way
the
free
movement
of
the
arm under
the
disc
can
be
checked.
CS
11
949 GB
4-2
-service
posHion
"2"
To
be
attained
by
pressing
the
"NEXr
key
after
service position
"1"
is
reached.
The
Indication "0002"
appears
on
the
display.
Make
sure
that
the
rafoc
unit
is within
the
reach
of
the
disc.
If
a
disc
is
put
on
the
turntable in
this
position,
the
working
of
the
decoder
(MC signal) and
the
turntable
motor
control
can
be
checked (turntable
motor
is running
at
the
right
speed).
Laser
control, focus control and turntable
motor
control
are
active. This position is very suitable
for
measurements
of
the
turntable
motor
control.
If
the
HF-signal
Is
not
well
coded
or
if
no
disc
is
present,
the
turntable
motor
will
start
rotating
at
maximum
speed.
-Service position
"3"
To
be
attained
by
pressing
the
"NExr
key
after
service position "2"
is
reached. The indication "0003"
appears briefly
on
the
display.
Then
the
normal
standby display
is
shown.
The
set
is
now
in the 2
nd
standby position.
All
keys have
their
original function
again.
In
case
of
deviations
an
extensive
error
indication
takes
place
via
the
display.
-
If
the µP
observes
a system
error,
a system
error
Indication will
appear
on
the
display: Er 01
to
Er 08.
-
If
the
µP
observes
an
operating error,
an
operating
error
indication will
appear
on
the display
for
1.5 sec.:
Er
30
to
Er
37
and
Er 60
to
Er
61.
For
an
explanation
of
the
error
indications: see
Error
table.
The
service
program
can
be
abandoned
by
turning
the
mains
switch
(POWER ON/OFF)
off
and
on
again
(Hardware reset).
CS
11
950
1GB
Specification measurement
CO
PLAYER
"'-----1
FILTER
t-------:R="
Fig. 4
!VN
AND
DISTORTION
METER
•-G·
SOU
NC
TECl!NOLOGV
ST
1700B
30
'59
A12
To
measure
the
specification
use
can be made
of
audio
test
disc
4822
397
30095.
Use 13th
order
filter
4822
395 30204
to
measure (see
Fig.4):
-Total harmonic distortion (THD)
-Intermodulation distortion
-Signal-to-noise ratio (S/N)
Continuous burning of the laser
See initiation
of
the
Servicing
programm
Service position
"O"
Note: Danger
Invisible
laser
radiation.
Avoid
direct
exposure
to
beam.
Check of the laser supply
The
laser
and,
the
laser
supply
in IC6525
plus
the
monitor
diode
form
a feedback system.
A
defect
in
the
laser
supply
can result
in
the
destruction
of
the
laser.
If, in
that
case,
the
laser
(=
complete
CDM2
unit) is
replaced, the
new
laser
will also become defective.
However,
it
is impossible
to
check and
repair
a feedback
system
if
a
link
Is missing. The
laser
supply
can be
checked
with
the
circuit
below.
The
green
LED replaces
the laser,
the
voltage
across
the
18 Ohm resistor is feed
back
as
monitor
voltage, the
33
Ohm
resistor
and the
switch
serve
to
draw
more
current
from
the
laser
supply
.
..---------<>
to
LO
.__
_____
---a
to ..L
Fig. 5
LED GREEN e.g. COY 94 IV
CONNECTED
DIRECTLY
TO
PANEL
42
444
A12
5322 130 32182
The
above
circuit Is connected
to
the connector
on
the
main panel·via
an
extension cable instead
of
a
flex
print.
The normal
flex
print
is
not
suited
for
this
purpose
because
of
its
high
internal resistance.
Code
no.
extension cable 4822 322 40066
C
C
(
(
(
C
-Take
the
above flex print
out
of
connector
31
on
the
main panel.
-Connect
the
circuit via
the
extension cable
to
the
connector.
-Selectthe playmode
by
grounding Si (pin
20
of
IC6525).
Note: Si "' 0, start Initialisation low, is
the
play mode.
-Measure
the
voltage LO (Laser Out)
at
test
point
9.
SK
open: 1,8V
,s;;
LO
,s;;
2,3 V
170
Mv
,s;;
LM
.,s;;
220 mV
The
green LED emits little light.
SK
closed: 1,8 V
,,;:;
LO
,s;;
2,3 V
170
Mv
,s;;
LM
.,r,;;
220
mV
The
green LED emits little light.
-During
the
change
over
from
SK
closed
to
SK
open,
the
LED will
emit
more light
for
a
short
moment.
-
The
control
sees
to
It
that
the
same
amount
of
current
flows through
the
LED
when
SK
is
open
and
when
SK
Is closed.
At
Si=
1, in
the
STAND-BY state,
LO=
0 V ± 0,2 V.
Repair
procedure
Since laser,
monitor
diode
and
photodiodes are very
sensitive
to
static charges,
care
should
be
taken
that
during measurements
and
adjustments
the
aids
and
yourself have a potential
that
is equal to that of
the
CD
mechanism.
Attention: When exchanging
the
CDM2
unit,
the
laser
output
potentiometer3528 should be placed in
mechanical mid-position
to
avoid damage
to
the
laser.
Adjusting the laser current.
Coarse adjustment
-Place potentiometer 3528 approximately in
mid-position.
-Put
test
disc
5
on
the
turntable.
-Bring
the
player In service position 3, position PLAY.
-
The
focusing
motor
can
now
start
focusing and when
it
has found
the
focal
point
index
01
will appear
on
the
display.
-
If
this does
not
happen,
turn
potentiometer 3528
clockwise
or
anti-clockwise a little and press
the
play
button again
Here after
the
fine adjustment
of
the
laser current
has
to
be
carried out.
Fine adjustment
-Play
track
1
of
the
test
disc
5.
-
Adjust
potentiometer
for
a voltage across 3508
test
point
1 and 2
of
50 mV ± 5 mV.
Adjustment of the focus
off-set
Coarse adjustment
-
Adjust
the
focussing
motor
to
the
eye
tor
a horizontal
position
by
means
of
potentiometer3517
-Here after
the
fine adjustment
of
the focus
off-set
has
to
be carried out.
Fine adjustment
-Bring
the
player in service position
2.
-Adjust potentiometer
351-7
for
a voltage
across
2545
(test point 27)
of
400
mV
±
40
mV.
Note: Notice that the CDM
is
in a horizontalposition.
4-3
Changing
the transformer connections
127V~
2
J
UNITS
SOLD
IN
US.A.
CANNOT
BE
CHANGED
AS THEY
HAVE
A DEDICATED TRANSFORMER
6
22ov~
24DV~
42
492
A12
Fig. 6
If
the set should be connected
to
a mains voltage
that
deviates from the voltage mentioned
on
the
type plate,
the transformer connections should
be
changed,
as
indicated
in
Fig.
6.
DETAILED MEASURING METHOD
I.
µP
IC6551
• Servicing program
For initiation
of
the servicing program see: General
checkpoint: Initiation
of
the
service program.
• Reset
(pin
1)
When
the
supply voltage is switched on, a positive
pulse should be present.
• X-tal out (pin 39;
test
point
13)
The frequency
of
this signal should
be
6 MHz.
• MSTP (pin 26;
test
point 78)
When, after
RD
"high",
the
MSTP is "high"
for
a
short
moment(
> 0.2 sec.), the turntable
motor
control will
be switched on.
The turntable motor is controlled
by
the
MC-signal
{test point 12).
To
check MC, see: "Decoder A IC".
To
check the
turntable motor control see CDM2 Service Manual
"Checking
of
the
motor control".
•
BO
(pin 11;
test
point
36)
B1
(pin 10; test point 34)
B2 (pin 9 ;
test
point
33)
B3 (pin 8 ;
test
point
32)
CS
11
951
GB
4-4
With
the
BO
+ B3
signals
•
The
radial
control
is switched on.
•
The
level
on
the
DAG
output
is
controlled.
-
In
the
SEARCH
mode,
there
should
be activity
on
all 4
test
points.
-
In
the
following
positions
the signals
BO
+
B3
are
stable:
STOP
PLAY Service Service
signal
pas.
0,1,2
pos.
3
BO
"low" "high" "low" "high"
81 "high" "high" "high" "high"
82
"high" "high" "high" "high"
83
"low" "low" "low"
"low·
•
TL
(pin 34;
test
point
16)
-
The
TL
signal (Track Lost) Is
used
to
tell
the
µP
that
track
loss
threatens. The µP then can give
correction
signals
with
BO
+
83.
-In the "SEARCH"
mode,
or
when
the
player
is bumped
against,
there
are
pulses
on
test
point
16.
• REdig (pin 7;
test
point
37)
The
REdig signal
(=
Radial
Error
Digital
"'
radial
deviation)
Is
used
to
determine
the
place
of
the
arm
relative
to
the
track
and
to
check/corect
in case
of
track
jumping
or
bumping against
the
player.
In
servicing
position
3
or
In
the
PLAY mode, a
square
wave
should
be
present
on
test
point
37.
Because
of
frequency
variations,
this
square
wave
is
hard
to
trigger.
• DODS (pin 5;
test
point
19)
The
DODS
signal(=
Drop
Out Detector Suppression)
avoids
that
Drop-Out
signals influence the arm
control
during
track
Jumping.
Position
of
player
D00S
signal
POWER
Servicing
ON
pos.
3
"low" "high"
PLAY
"high"
SEARCH
7-r'U
MDA
.00364
T12
-638
11.
PHOTODJODE
SIGNAL
PROCESSOR IC6525
• SC (pin 25)
SC(=
Start Capacitor)
High Ohmic measurement
Position
of
player
SC
(pin 25)
POWER
ON
-4
V
PLAY
+5V
Servicing pos. 1
+5
V
CS
11 952 GB
• SI (pin 20;
test
point
21)
LO
(pin 17;
test
point 9,
9-',
98)
-With
the
Si signal
(=
Start
Initialization)
the
laser
supply,
among
other
things, is switched on.
When the Si signal is "low",
the
LO
signal
(=
Laser
Out)
should
be "high".
Via
the
LM
signal
(=
Laser
Monitor)
the
power
supply
for
the
laser
diode
is controlled.
Position
of
POWER Servicing PLAY
player
ON
pos.
1
*)
Si signal "high" "low" "low"
LO signal "low" "high" "high"
• LM (pin 16:
test
point
11)
to
check
LM
See general checkpoints 'check
of
the
laser supply'
• To
check
the
laser
supply, see General checkpoints
"Check
of
the
Laser
Supply".
• To
check
the
focus offset, see Generalcheckpoints
"Adjustment
of
the Focus Offet".
*)
To
ensure that
the
player
stays in servicing position
1,
there should
be
a
disc
on
the
turntable.
• FE pin (pin
5;
test
point 26)
-The FE signal
(=
Focus Error)
is
used
to
drive the
focusing
u.!
(
(
C
Check
of
the
photodetector.
Connected
the
circuit
below
to
an atternating
voltage
of
17,5
V.
100
E-1.5 W
BAW62
CQY 89
~•E:-..
___
_
1.15W
BA.W62
•
4822
116
51098
-
4822
130
30613
-
4822
130
31332
.,,
-'CQY89
39368
A12
Switch
on
the supply voltage and bring
the
player
in
the stand-by mode
or
in
serciving position 0.
In this measurement, infrared
diode
CQY89 replaces
the function
of
the
laser
diode.
When this diode
is
held above
the
objective unit, the
infrared light falls on the 4 photodiodes.
When
the
4
photodiodes
are
functioning,
the
following
voltage
form
will be visible
on
test
point
4, 6, 7
and
8
on
the panel.
(The amplitude
depends
on
the
distance
between
the
IR diode and the objective).
~
n n
cru
L
38
31L
A12
Position
of
the oscilloscope:
100
ms/div.
• HF-in (pin
3,
teat point 3)
-The
HF-signal(=
High Frequency in)
is
the
information
signal
from
the
4 photodfodes.
• HF-out
(pin
27;
test point 17)
-
The
HF-out
signal(::: High Frequency)
is
the
amplified
information
signal
for
the
decoder
circuit.
During
playback
of
test
disc
no.
5 (4822 897 30096), a
so-called "eye pattern" should be
present
on
test
point
17
(see
figure
below).
-
The
HF
signal should
be
present
and
stable
in
the
PLAY
mode
37
017
88
Position of
the
oscilloscope:
0,5
µs/div.
Amplitude
about
1,5 V
PP
4-5
e DET (pin 26)
HFD
{pin
19;
test
point 23)
TL
(pin
18;
test
point
16)
-
The
DET signal
(=
Detector) gives information
on
the
level
of
the
HF signal
to
the
high-frequency.
Level-Drop-out
detector
IC6525.
-When
the
level
of
the HF signal
is
too
low, the
HFD
signt&J= High Frequency Detector) will
go
ttlowtt
.
-The
TL
signal
(=
Track
Lost) will
then
go
"low"
in
order
to
tell
the
µP
that
the
RE
1
and
RE 2 tracking signals
are
unreliable.
Method:
(Can
only
be used in a playing set).
-
Put
test
disc
5A
84822
397
30096)
on
the
turntable.
-Switch
on
the
power-supply
switch
and
press
the
PLAY
key.
-Play
track
number
10
or
15
and
check
the
HFD signal
at
test
point
23.
When
drop-out
pulses
are
present
on
the
DET signal
(pin 26), the
HF □
pulses should
also
be
present
at
test
point
23.
(Position
of
oscilloscope: 2 ms/div.).
When the
disc
is
slowly
braked
by
hand,
TL
pulses will
be visible
at
test
point
16.
• RE1
(pin
11; test point
18)
RE2 (pin 12; test point
22)
-Signals
RE1
and
RE2 (Radial
Error)
are
the control
signals
for
the
arm
during tracking.
-In servicing position 3, position PLAY, the following
signals should be visible
at
test
point
18
and
22.
JD
70
l!IU/J.
Position
of
the
oscilloscope: 2
ms/div.
The
frequency
strongly
depends
on
the
eccentricity
of
the
disc.
Ill.
RADIAL
ERROR PROCESSOR IC6529
• Check
the
signals between
the
µP
and
the
Radial
Error Processor and
the
signals
between
the Photo
Diode Signal Processor and
the
Radial
Error
Processor.
•
DAC
(pin 1
O;
test point 38)
Wlth
the
DAC signal
(=
Digital
B0+B3
signal converted
into
the Analogue signal) the
track
jumping
speed
is
controlled.
This
signal
is
derived
from
the signals
BO
+
83
coming
from the µP.
CS
11
953GB
4-6
• RE-lag (pin
8;
test point 41)
Capacitor 2559 in
the
RE-lag circuit has a memory
function.
It
memorizes
the
degree
of
inclination
of
the
disc.
When a
jump
is
made
to
a certain
track
on
the
disc,
the
memory
should
be
cleared.
This is
done
by
the
µP
(RPU signal) via transistors
6533, 6534.
During
track
jumping (SEARCH),
slow
pulses should
be
visible
at
test
point
43
(position
of
the
oscilloscope
0,1
ms/div.)
In
that
case
pulses should also be visible
on
the
collector
of
transistor 6533, 6534.
IV. DECODER-A IC
• Check the
MC
signal (pin 17; test point 12)
-In stand-by mode,
the
MC signal
(Motor
Control)
corresponds
to
the
figure below.
-Place a
disc
on
the turntable.
-In position PLAY
or
SERVICE POSITION 3 position
PLAY
the
MC
signal corresponds
to
the
figure below.
Ul_fl_
POSITION:
STANO
ll'(
lriL_
PQSITICN
'.
!'LAY (
BEGINNING)
POSITION:
PLAY
INOR1o4All
33
1'9
A12
Opmerking:
Note:
During start-up
the
duty
cycle
is
98%, then
the
duty
cycle
of
the
signal becomes
about
50%.
• VC {connector point 15-1;test point 46)
-Place a
disc
on
the
turntable.
-
The
voltage
at
connector
point
15-1 during playback
wilt be:
Ve
=0
>Ve>
-1.7V
To
check
the
turntable
motor
control, see C.D.M.-2
Service Manual: "Checking
of
the
motor
control".
• Check the
HF
signal test point
65
(eye patem)
-place a
disc
on
the
turntable
-
The
HF
signal is
present
and
stablein the positionplay
See figure below.
A~
CS
11
954 GB
• Check
the
HFD-signal
on
test point 66, pin
26
-
Insert
a disc.
-In
the
PLAY
mode
and in SERVICING POSITION
3,
position play,
the
HFD-signal is "high"; however, minor
pulses
may
be
present and in case
of
disorders
on
the disc.
-During playback
of
track no.
15
of
test
disc
5A
HFD
pulses are visible.
Position
of
the
oscilloscope 5 ms/div.
HFD~
M(JA
002<0
T07f7J.'.l
• Check the CEFM signal (pin 27; test point 68)
-Place a
disc
on
the turntable.
-In stand-by
mode
(only
the
mains switch is
depressed),
the
frequency lies between 2.82
MHz
and
5.64 MHz.
-In
the
position PLAY
the
frequency is 4.32 MHz.
• Check the Xin signal (pin 19; test point 69)
-The Xin frequency is 11.2896 MHz.
If
this frequency deviates, check
test
point
70;
Xout
signal,
on
Filter-8 IC.
This
frequency should
also
be 11.2896 MHz.
• Check
the
timing signals meant for Filter-B IC
-Place a
disc
on
the turntable.
-Select
one
of
the
following positions:
SERVICE POSITION, 3 position PLAY,
or
position
PLAY.
-Trigger
the
oscilloscope with
the
WSAB
signal (test
point
71; pin 39).
-Check signals:
WSAB at
test
point
71
(pin
39)
(Word Select
from
Decoder-A
to
Filter-B)
GLAB
at
test
point
72
(pin 38)
(Clock
from
Decoder-A
to
Filter-8)
and
their
interrelation.
-There
must
be
activity a
test
point
73 (pin
37),
DAAB
signal (DATA
from
Decoder-A
to
Filter-8).
• Check the EFAB signal (Error Flag from Decocder-A
to Fllter-8)
at
test point
74
(pin 36)
-Place
test
disc
SA
on
the
turntable.
-Select
one
of
the
following positions:
SERVICE POSITION 3
or
position PLAY.
-During playback
of
track no. 17, a EFAB pulse
should
appear
at
test
point
61
for
a
short
moment.
The
EFAB pulses
also
appear when
the
disc
is
gently
slowed
down
and during fast search (Fast Forward
or
Fast Reverse).
Note:
Filter-B IC
is
capable
of
interpolating linearly 8
successive EFAB pulses.
L-~1~
Ill
period
-..........L.L~-
EFAB
(error
flog)
II I
11 11
I
38
845
A12
(
C
C
(
(
•
Check
the
a-channel
signals
-Place a disc
on
the turntable.
-Select one
of
the following positions:
SERVICE POSITION 3 position
PLAY
or
position PLAY.
-Trigger
on
the ORA signal (Q-channel Request
Acknowledge) test point 75; pin30.
-Check signals: QRA
at
test
point
75
(pin 30)
QCL a
test
point
76
(pin 31)
(Q-channel-clock)
and theirinterrelation.
There should then
be
activity
at
test
point 77 (pin 29)
ODA (O-channel Data).
Note:
The ORA request
is
initiated by
the
µP
(ORA "high").
Then Decoder-A answers this request (ORA
goes
"low").
With the
next
leading clock pulse (QCL) the ORA signal
is
rendered "high" again
by
the µP.
As
soon
as
the
µP
has
taken in enough information via
ODA,
ORA
will
go
low
again. That
is
why
the ORA times
vary each time.
"""""""'
F~
CCC00€1'1
~
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SUFR:JEHT OA1/j
co."""
"'~"=--~------
n..,,.Etua..£
8'1'
OECCQEA
II
Wllllllllllllllllllllllllll
•
Check
the
SSM
signal
(test
point 78; pin
33)
=
Start-Stop turntable motor
-
Motor
start
pulse when test point
78
ls
"high"
for
;;,,.
0.2 sec.
-
Motor
stop pulse when
test
point
78
is
"low"
for
;;,,.
0.2
sec.
Note:
After the
motor
start
pulse, SWAB information
(Subcoding Word clock) will become visible
at
this point.
The period time
of
that signal is
136
µsec.
•
Check
the
subcode clock signals
-Place a
disc
on
the turntable.
-Select one
of
the following positions:
SERVICE
POSITION
3
or
position PLAY.
-Trigger the oscilloscope with the SWAB signal
at
test
point
78.
-Check the following signals:
SWAB
at
test
point
78; pin
33
SCAB
at
test point 79; pin
35
(Subcode Clock
from
Decoder-A
to
Filter-B)
SDAB
at
test
point 80; pin
34
(Subcode Data
from Decoder-A
to
Fllter-B)
and their interrelations.
4-7
Note:
While the burst
of
10
clock pulses appear
on
SCAB
the a-channel information Istransferred
on
SDAB.
Hereafterthe P-bit indication follows.
The P-blt is "high" between
two
bursts
of
1Dclock
pulses in case
of
pause indication and "low· in case
of
music indication.
SWAB
llOA8
-------=
•
Check
the
CRI
signal (pin
28)
MDA.00239
112/538
The CRI signal is "low" In case
of
track jumping.
Player In position SEARCH.
•
Check
the
DEEM
signal
(test
point 84; pin 32)
-Place test disc 5
on
the turntable.
-During playback
of
track no.
14
(recorded without
PRE-EMPHASIS), the DEEM signal should be "low".
-During playback
of
track no.
15
(recorded without
PRE-EMPHASIS), the DEEM signal should be "high".
V.
FILTER-B IC
•
Check
the
signals between
Decoder-A
IC
and
Fllter-B
IC
See sub. "IV. Decoder-A IC":
• Check the X-tal signal
• Check the timing signals meant
for
Filter B
(WSAB,
CL.AB,
DAAB signals;
test
points 71, 72 and
73).
• Check the EFAB signal (test
point
74)
• Check the subcode clock signals
(SWAB, SCAB, SDAB signals;
test
points 78, 79 and
80).
• Check
the
timing signals
between
Filter-B IC
and
DACIC
-Place a disc
on
the turntable.
-Select one
of
the followlng positions:
SERVICE POSITION 3 position PLAY
or
position PLAY.
-Trigger the oscilloscope with the WSBD signal (Word
Select from Filter B to DAG) test
point
85
(pin 18).
-Check the following signals:
WSBD
at
test point 85;
pir:'
18
CLBD at test point 87; pin 16(Clock signal
from
Filter B
to
DAC)
and their interrelation.
If
an
Audio Disc is used, there should be activity
at
test
point
86 (pin 15) DABD signal (DATA from Filter B
to
DAC).
If
a
disc
with Digital Data {CD-ROM) is used, this point
is
continuously switched "low"
by
transistor 6562.
CS
11
955
GB
4-8
~1
l?U~Hz
~
·~
e
Check
the
DOBM
signal (Digital Output)
-Place a
disc
on
the
turntable.
-Select
the
stand-by
mode
(only mains switch
depresed).
Trigger
the
oscilloscope
with
the
WSAB
signal {test
point
71).
•
Check
the
DOBM
signal
(test
point 88; pin
14)
-
An
empthy
audio
signal
has
a
fixed
pattern. See
drawing
"Stand-by".
-Select
the
PLAY
mode.
Check
the
DOBM
signal. See
drawing
"PLAY".
""""
l"Q1
STN-0-IIJ'I'
e
In
position SEARCH
the
ATSB
signal
is
"low" (lest
point 89;
pin
22)
(Attenuation Audio Signal)
• Check
the
MUSB
signal
test
point 90; pin
23
((Soft
Mute)
This
signal
is "low" in positions:
PAUSE
NEXT
or
PREVIOUS
when
jumping
from
one
track
to
another.
Fast SEARCH
when
the
search button
is
kept
depressed
for
some time.
CS
11 956 GB
VI.
DAC
IC (Dual Digital Analog Converter)
•
Check
the
signals
between
Filter-B
IC
and
DAC
IC
-See sub. "V. Filter-B IC":
•
Check
the
timing signals between Fllter-B
IC
and
DACIC
•
Check
the
output
of
the
OP-AMP
after
the
DAC
IC
-Place a
disc
on
the
turntable.
-In position PLAY
or
in SERVICE POSITION 3 position
PLAY, the analog (music) signal should
be
present
at
the
output
of
the
OP-AMP,
after
the
lead-in
track
has
been
read.
VII. DEEM CIRCUIT
e
Check
DEEM
circuit
-Place
test
disc
5
on
the
turntable.
-During playback
of
track
no.
14
(recorded
without
PRE-EMPHASIS)
the
DEEM signal
at
test
point
84
should
be
"low".
-During playback
of
track
no.
15
(recorded
with
PRE-EMPHASIS)
the
DEEM signal
at
test
point
84
should
be
"high".
-During playback
of
track
no.
14
the
analogue signal
should
be
present
at
the
source
of
6583
(test
point
91)
and 6582 {test
point
92).
-During playback
of
track
no.
15
the
analog signal
at
the
source
of
6583
(test
point
91) and 6582
(test
point
92)
should
be
O
V.
VIII. KILL CIRCUIT
-During switching
on
and
off
the
mains voltage
the
signal
on
the
collector
of
6580 (to be measured
on
a
jumper,
tp93)
should
be
as
Indicated inthe figure
below
.
02SE~
'
POWER
ON
.,.,
IN
'
POM:R
OFP:
MDAOOl,34
TOT/733
(
(
C:
(_
ERROR
TABLE
Er
01:
RD
pulse is missing. Check the start capacity Sc,
the
RD
signal and the photodiode signal processor
(Startin_g_error). _
Er
02:
TL
pulse Is missing during start-up. Check the
TL
signal, the
HF
signal and the Photodiode signal
processor (Starting error).
Er
03: Lead-in track not found. Check the disc used.
Check also that the radial arm rests against the inside.
Check the RE-dig signal and the Radial error processor
(Starting error). _ .
Er
04:
Too many
TL
pulses during play. Check the quality
of
the disc used. Check the HFD signal. (Error during
PLAY).
Er
OS:
TL
pulse is low
for
more than 50 msec. Check the
disc used. Check the HF-in signal and the photodiodes.
(Error during PLAY).
Er
06:
TL
pulse is low
for
more than 0.5 sec. during track
jumping. Check the RE-lag circuit. (Error during SEARCH
or
NEXT/PREVIOUS).
Er
07:
Subcode error. In case
of
track loss during play
the information
of
the subcode is used
to
determine the
place
of
the last information that was still well readable.
In case
of
an
interruption
of
HF
or
other signals, this will
lead to Er
07
(Error during PLAY).
Er
08:
TOC error {Table
of
Contents). Check the quality
of
the disc used. Check the initial speed
of
the turntable
motor
and the motor control. Check also that the radial
arm rests against the inside. (Starting error).
Temporary
errors
Er
30:
NEXT when repeat is off.
Er
31:
PREVIOUS
when repeat is
off
.
Er
32:
INDEX selected wtien no track selected.
Er
33:
Selected index does not exist on this
CD
.
Er
34: Review error: no program
Er
35:
Program memory full.
Er
36:
Programmed track is non existing
on
this
CD.
Er
37: Selected track is
non
existing on this CD.
Er
60:
Fast forward bound.
Er
61:
Fast reverse bound.
5-1
5-1
EXPLODED
VIEW
LOADING
1
01
102
103
104
106 _
______
_,,,,..
Partslist
loading
101 4822 466 92111
102 4822 325 60317
103 4822 444 50582
104 4822 358 10115
106 4822 522 32359
107 4822 532 51756
108 4822 402 61081
109 4822 528 90638
111
4822 402 61107
112 4822 492 63659
3MK20
l
<'
~2
~E
ef/Xl
.
I
109
111
~ -
--
--
·
112
113 4822
444
60467
114 4822 492 32762
116 4822 528 90639
117 4822 532 11547
118 4822 462 50383
119 4822 492 51902
121
4822 466 61587
122 4822 492 63746
123 4822 361 20998
124 4822 402 50244
126 4822 492 51935
cS
113
114
116
---------
117
>---------
118
2
-='3
I. 119
·0----121
I i
I
'
JMK
l2
~.;...r-----
122
EVA.00365
T07[722
CS
12 122 GB
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