Sharp SYSTEM-CD555ZT(GY) User manual

SHARP
SERVICEMANUAL
S$3410SYSCD555
SYSTEM-CD555ZT(GY)
COMPACT
IS
¢
Inthe
interests
of
user-safety
the
set
should
be
restored
to
its
original
|
DIGITAL
AUDIO
condition
and
only
parts
identical
to
those
specified
be
used.
TROUBLESHOOTING (CD SECTION)
FUNCTION
TABLE
OF
UG
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eosececglocéoscd
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SHARP
CORPORATION

-SYSTEM-CD555ZT
|
FOR
A
COMPLETE
DESCRIPTION
OF
THE
OPERATION
OF
THIS
UNIT,
PLEASE
REFER
|
i
TO
THE
OPERATION
MANUAL.
@ General
3 Power source:
Power consumption:
Output power:
Output terminal:
Dimensions:
Weight:
@ Tuner section
Frequency range:
@ Tape deck section
Frequency response:
Signal/noise ratio:
Wow and flutter:
Motor:
Bias system:
Erase system:
SPECIFICATIONS
AC 220 - 230 V, 50 Hz
DC
12
V[“D’
size
(UM/SUM-1,
R20
or
HP-2)
battery
x
8]
55W
PMPO;
46
W
(23
W
+
23
W)
(AC
operation)
MPO; 14 W(7W+7 W)
(AC operation)
RMS; 10 W (5 W +5 W)
(DC operation, 10 % T.H.D.)
Headphones; 16 - 50 ohms
(recommended; 32 ohms)
3.5 mm (1/8") socket
CD out; 0.5 V/10 kohms
RCA pin type
Width; 294 mm (11-9/16" )
Height; 269 mm (10-9/16")
Depth; 229 mm (9")
3.9
kg
(8.6
ibs.)
without
batteries
FM; 64 - 108 MHz
LW; 148.5 - 283.5 MHz
MW; 526.5 - 1,606.5 kHz
SW; 5.95 - 18 MHz
50 - 14,000 Hz (Normal tape)
55 dB (TAPE 1, playback)
50
dB
(TAPE
2,
recording/playback)
0.25%
(WRMS)
DC
12
V
electric
governor
(1motor)
AC
bias
AC erase
STRINGING
1.
Turn
the
drum
fully
in
the
direction
®
shown
in
Fig.
2-2
and
Stretch
its
cord
over
the
parts
in
the
numerical
order.
2.
Then
turn
the
tuning
control
shaft
fully
in
the
direction
@
shown
in
Fig.
2-2
and
fix
its
pointer
as
shown
in
Fig.
2-1.
Dial Pointer
(222)
Figure 2-1
@
Compact
disc
player
section
Dise:
Compact
disc
Signal
readout:
Non-contact,
3-beam
semi-conductor
laser
pickup
Audio channels: 2
Decoder:
16-bit
linear
quantization
Filter:
4-times
oversampling
16-bit digital filter
Frequency
response:
20
-
20,000
Hz
Dynamic
range:
90
dB
Wow
and
flutter:
Unmeasurable
(less
than
0.001%
W.
peak)
@ Speaker section
Type:
2-way
bass-reflex
type
Speakers:
12
cm
(4-3/4")
free-edge
woofer
x
2
Maximum
input
13W
power:
Dimensions:
Width;
170
mm
(6-5/8”
)
Height; 261 mm (10-1/4")
Depth; 190 mm (7-7/16")
Weight:
1.5
kg
(3.3
Ibs.)
/each
poate
;
=]
|
Specifications
for
this
model
are
subject
to
change
without
prior
| notice.
Sh
Se
ey
See
Pee
eee
a
Ee
oer
OF DIAL CORD
Drum : | 422mm |
(223)
Figure 2-2

@ CD display section
1. Piay Indicator: p>
2.
Track
Number
Indicator
3. Random Indicator
4.
Minutes
and
Seconds
indicator
5.
Memory
Indicator:
M
6.
Pause
Indicator:
11
7.
Programme
Indicator:
P
8. Repeat indicator: <
@ CD section
§. CD Compartment
10. CD Eject Button: «
11. Clear Button
12. Random Button
13. Call Button
14. Memory Button
15. Stop Button: m
16.
Play/Repeat
Button:
»
17.
Track
Up/Cue
Button:
ppi/>p>
18.
Track
Down/Review
Button:
w«/<<
19.
Pause
Button:
11
®@
Amplifier
section
20.
Graphic
Equalizer
Controls
21.
Extra
Bass
Control:
X-BASS
22.
Power/Function
Switch
:23.
Power/TAPE
1
Direction
indicators
24.
Volume
Control
@ Tuner section
25.
FM
Mode/Tape
Selector
Switch
26.
FM
Stereo
Indicator
27.
Band
Selector
Switch
28. Tuning Control
SYSTEM-CD555Z
Tr Ur
c=K=Te))
(CE Ceo
S>—-
25
26
27
28

@ Tape section
1. Dubbing Speed Switch
2. FM Mode/Tape Selector Switch
3.
Power/TAPE
1
Direction
Indicators
TAPE 2 |
4. Record Button: @
5. Play Button: >
6. Rewind Button: <<
7. Fast Forward Button: >>
8.
Stop/Eject
Button:
Ba
9. Pause Button: II
TAPE 1 |
10.
Reverse
Mode
Switch:
po/.>
11.
Play
Button:
<>
12.
Fast
Wind
Buttons:
<<>>
13.
Stop/Eject
Button:
mya
14. Direction Switch: «<p>
@ Rear panel
15. FM/SW Telescopic Rod Aerial
16. Left Speaker Release Lever
17. Beat Cancel Switch
18. Headphones Socket
19. Speaker Terminals
20. CD Output Sockets
21. Right Speaker Release Lever
22. AC Power Input Socket
23. Battery Compartment
@ Speaker section
24. Tweeter
25. Woofer
26. Bass Reflex Port
27. Speaker Wires
(GaananManaenel
456
7
8
91011121314

SYSTEM-CD5552T
SYSTEM-CD555ZT
DISASSEMBLY
——
Caution
on
Disassembly
|
My)
x5
Follow
the
below-mentioned
notes
when
disassembling
the
|
(Al)
x2
3x.G5mm
unit
and
reassembling
it,
to
keep
its
safety
and
excellent
|
$3x
12mm
¢
|
performance:
|
-
1.
Take
cassette
tape
and
compact
disc
out
of
the
unit.
i
:
2.
Be
sure
to
remove
the
power
supply
plug
from
the
wall
outlet
before
starting
to
disassemble
the
unit
and
remove
|
the
batteries
from
the
unit.
3.
Take
off
nylon
bands
or
wire
holders
where
they
need
be
|
removed
when
disassembling
the
unit.
After
servicing
the
|
unit,
be
sure
to
rearrange
the
leads
where
they
were
before
-
disassembling.
|
4.
Take
sufficientcare
on
static
electricity
of
integrated
circuits
|
and
other
circuits
when
servicing.
Rear Cabinet
(H1)
x14
LCD
PWB
$3
x
10mm
Top Cabinet
Figure 6-1
REMOVAL
Rear Cabinet
(G2)x 4
?3 x 10mm
Graphic EQ. PWB
sdbeeiauateeetahes (B1)x4
TID saitenkteniecsane (B2)x1
. Socket / Flat Wire ...(B3)x2
Top Cabinet
(H2) x 1
Figure 6-3
Main PWB
(with Tuner
Frame)
(F1) x2
& (B1) x2
.
$3
x
10mm
$3 x 12mm
Volume
PWB
Main
PWB
Front Cabinet
Graphic
EQ.
Front
Cabinet
Figure 6-2
7
fi
0 =
a
B1)x2
O3 x2
Switch PWB
(B3) x1
CD Servo PWB :
:
Figure
5-2
CD Mechanism ‘
Volume CD Servo
SPEAKER
PWB
PWB
EMOVAL
Top Cabinet
Front Cabinet
Front Cabinet
(D3) x1
(D2) x 4
Sr (D4) x7 D1
©
$3
x
10mm
Ga.
tunes
Figure 5-3

REMOVING
AND
REINSTALLING
THE
MAIN
PARTS»
TAPE MECHANISM SECTION
Perform
steps
1,
2,
3
and
4
of
the
disassembly
method
to
remove
the
tape
mechanism.
How
to
remove
the
record
/
playback
and
erase
heads
(TAPE
2)
(See
Fig.
7-1.)
.
1. Remove the 2 screws (A1) to remove the button frame.
2.
Remove
the
2
screws
(A2)
to
remove
the
record/playback
head.
3.
Remove
the
2
screws
(A3)
to
remove
the
erase
head.
Note:
After
replacing
the
heads
and
performing
the
azimuth
adjustment,
be sure to apply screwlock.
How
to
remove
the
playback
head(TAPE1)
(See
Fig.
7-2.)
1.
Remove
the
2
screws
(B1)
to
remove
the
button
frame.
2.
Remove
the
2
screws
(B2)
to
remove
the
playback
head.
Note:
1.
The
playback
head
of
this
mechanism
is
supplied
as
finished
product
with
flexible
PWB.
Before
removing
the
flexible
PWB,
remove
the
solder
on
the
switch.
2.
After
replacing
the
head
and
performing
the
azimuth
adjust-
ment,
be
sure
to
apply
screwlock.
How to remove the pinch roller(TAPE 2)
(See Fig. 7-3.)
1.
Carefully
bend
the
pinch
roller
hook
in
the
direction
of
A,
and
remove
the
pinch
roller
(C1)
upwards.
How to remove the pinch roller(TAPE1)
(See Fig. 7-3.)
1.
Remove
the
stop
washer(D1)
with
a
small
precision
screwdriver
and
extract
the
pinch
roller.
2. To remove the left pinch roller, use the same procedure.
Note:
If
the
stop
washer
is
deformed
or
damaged,
replace
it
with
a
new
one.
(Al)xl
(Ai)x!
i ,
Button Frame
Erase Rec/P.B
Head Head
i!
(A2)x!
S2x7mmM
(A2)xI
“ $2x3mm
(A3)x2
=
se ae
Lp
Sapes husk we eee:
aS 2a
Erase
Washer
=
Head
Azimuth
—
Flywheel
Spring
Spring
Figure 7-1
Button
(Bidx!
62x9mm
J 822
G2x4.5mm
Fiexibie
PwB
+ |
Flywheel
Figure 7-2
(C1)
Pinch Roller
Pinch Roller
~~»
°
°o
~&
(DI)x!
Stop Washer
Figure 7-3
SYSTEM-CD555ZT
SYSTEM-CD5552T
How to remove the belt (See Fig. 8-1.)
1. Remove the tape 2 main belt (E1) from the motor side.
2. Remove the FF/REW belt(E2).
3. Remove the tape 1 main belt (F1) from the motor side.
How to remove the motor (See Fig. 8-2.)
1. Remove the 2 screw (J1) to remove the tape 2 mechanism.
2. Remove the 3 screws (J2) to remove the motor.
CD MECHANISM SECTION
Perform steps 1, 2, 8, 9 and 10 of the disassembly method to
remove the CD mechanism.
Removing the optical pickup (See Fig. 8-3.)
1. Remove 4 pawls (A1) and remove cover (A2).
2. Remove 4 screws (A3) and remove 2 shafts (A4).
(FI)
Main Belt
Figure 8-1
(J2)x3
K> Special
Screw
(A3) x2
$2.6 x 8mm
Figure 8-3

SYSTEM-CD555ZT
ADJUSTMENT
MECHANISM SECTION
e Driving Force Check
Torque Meter
Play: TW-2412
Reverse play: TW-2422 Over 60g
e Torque Check
Torque Meter Specified Value
Play: TW-2114 30 to 60 g.cm 30 to 60 g.cm
Fast
forward:
55
to
120
g.cm
55to
120g.cm
TW-2231
Rewind:
TW-2231
55
to
120
g.cm
55
to
120
g.cm
e Head Azimuth
MTT-114
e Tape Speed
InstrumentConnection
Headphones Jack
(Load resistance: 32 ohms)
Test
Tape|
Adjusting
|
Specified
Value
instrument
Point
Connection
Headphones
Jack (Load
resistance: 32 ohms)
MTT-111 | VR401 3,000 + 90Hz
TAPE SECTION
Position of each switch or control
Beat cancel switch
Graphic equalizer/X-Bass
Dubbing speed
e Bias Oscillation Check
Specified Vaiue
A: 80 + 4 kHz
B: +4+ 1 kHz forA
C: +6 + 1 kHz forA
Beat cancel
e Erase Current Check
es
Resistor for measurement: 1 ohm
e
Playback
Amplifier
Sensitivity
Check
Speaker Terminal
(Load resistance: 3 ohms)
Specified Value
MTT-118 1.0V+3dB
SYSTEM-CD555ZT
TUNER SECTION
fL: Low-range frequency
fH: High-range frequency
e FM IF/RF
Test Stage Specified Value/
Adjusting Point
Band Coverage! fL: L2
fH: TC2
64.0 MHz: L1
94.0 MHz: TC1
Instrument Connection
Input: Antenna
Output: Pin 9 of IC2
\
{
|
4
Tracking
e VCO Frequency
Adjusting instrument Connection
Point
VR1 38 KHz + 100 Hz
Specified Value
Pin 6 of IC3 \
Adda resistor(10 kohm) between pin 7 of C3 and ground,and adjust
Note:
in stereo state.
e AM IF/RF
Test Stage Specified Value/ Instrument Connection
Adjusting Point
F
LW Band fL: L6
Coverage fH: TC6
LW Tracking | 170 kHz: L3(LW)
270 kHz: TC7
fL: L5
fH: TC4
600 kHz: L3(MW)
1,400 kHz: TC3
SW Band fL: L7
Coverage fH: TC8
SW Tracking | 6.5 MHz: L4
16 MHz: TC5
Input: Antenna
Output: Pin 5 of IC2
Input: Antenna
Output: Pin 9 of IC2
MW Band
Coverage
MW Tracking
SPEAKERS
BEAT
aie
a
CANCEL
Prones
“8
©
3
NALW
Bae
‘ON
'
MES
ao
mA
TRACKING
iF
7
ft
FM
BAND
|
r+
|
COVERAGE
I
13
[tH]
HPS
TT
Tae
ree
ts
2a
r
tt,
LZ
T2
Tai
BAND
=
i5[(@]|@
13
:
i
coverace
[nt
—1-
=
Te45
tc
2
wa
1C2
[fH]
FM
z
C3
Ob
tc;
TRACK
ING
Eee
apm
or
=
R/P_SW
-
[
—s
ee
(Q)"
{Fu
F]
ees
ee
7]
VR401
Lw
SPEED
MAIN PWB-A1 :
Figure 10 ADJUSTMENT POINTS
-10=

SYSTEM-CD555ZT
CD SECTION
"Track
skipping
and/or
no
TDC(Table
Of
Contents)
may
be
caused
by
a
build
up
of
dust
other
foreign
matter
on
the
laser
pickup
lens.
Before
attempting
any
adjustment
make
certain
that
the
lens
is
clean.
If
not,
clean
it
as
mentioned
below.”
1. Turn the power off.
2.
Gently
clean
the
lens
with
a
lens
cleaning
tissue
and
a
small
amount
of
isopropyl
alcohol.
Note:
Do
not
touch
the
lens
with
the
bare
hand.
1. Preparation for Adjustment
Setting the Test Mode
TEST
MODE
0
Pressing
simultaneously
the
All
the
segments
light
for
1.5
“CLEAR”
and
“CALL”
buttons,
set
|
seconds
and
then
the
Test
Mode
the
function
switch
to
“CD”.
0
indication
appears.
“|
F
=
=]
TEST
MODE
1
TEST MODE 2
TEST MODE 3
TEST MODE 4
TEST MODE 5
After
TEST
MODE
5
the
PLAY
button
is
inoperative.
Even
when
it
is
pressed
(6th
time),
key
entry
is
not
accepted.
In TEST MODE 0 press once the
PLAY button. (1st)
Laser lights.
In TEST MODE 1 press once the
PLAY button. (2nd)
Focus start
(Servo ON)
Disc rotates.
(Spin servo ON)
(Use the disc.)
In TEST MODE 2 press once the
PLAY button. (3rd)
In TEST MODE 3 press once the
PLAY button. (4th)
Tracking servo ON
(Use the disc.)
Track No. and time are indicated.
(Use the disc.)
In TEST MODE 4 press once the
PLAY button. (5th)
*Unless
the
CD
lid
switch
SW961
is
tumed
on,
the
test
mode
is
not
set.
Button Operation in Test Mode
14.
When
the
STOP
button
is
pressed,
all
operations
stop.
At
this
time
the
optical
pickup
does
not
slide,
and
TEST
MODE
0
is
displayed.
2.
While
the
UP/CUE(DOWN/REVIEW)
button
is
pressed,
the
optical
head
moves
from
inside
to
outside
or
from
the
outside
to
the
inside.
*
Operation
is
possible
both
during
playing
and
stopping.
e
While
this
operation
is
executed,
the
TEST
MODE
indication
does
not
change.
After
the
optical
pickup
is
slided
from
the
outside
to
the
inside
and
the
optical
pickup
switch
is
turned
on,
the
slide
stops.
(At
the
same
time
TEST
MODE
Ois
set.)
Notes:
1. Any buttons other than those specified above are invalid.
2. Before operation be sure to connect all the connectors.
442
SYSTEM-CD5552ZT
Servo Unit
All the semivariable resistors must be set in the mechanical center position.
Adjusting Parts
Instrument Connection
i
Set
TEST
MODE
0,
and
move
the
pickup
to
the
center
i
Set
Test
MODE
1
(make
sure
that
the
laser
lamp
lights)
After
loading
a
disc,
set
to
TEST
MODE
2.
(Check
to
see
that
focus
servo
is
ON.:
The
disc
does
not
rotate,
and
a
whining
sound
is
heard.)
Set
TEST
MODE
3
(Spin
servo
is
turned
on,,
and
the
disc
rotates)
i
|
i
Tracking
error
balance
adj.
NVRA1
*4
(See
Fig.
12-1)
Pin
6
(1/2Vcc)
and
pin
4
(TG1)
of
TP751
Set
TEST
MODE
4
(Tracking
servo
is
turned
on.)
|
Check
the
HF
signal
waveform
_
Amplitude
of
1.5-2.0
Vp-p
|
Pin
3
(HF)
and
pin
7
(GND)
of
'
|
(See
Fig.
12-2.)
|
TP751
Focus
gain
adj.
VR751
Adjust
to
obtain
the
same
waveform
|
Pin
1
(FG1)
and
pin
5
(FG2)
of
|
on
CH1
and
CH2.
*2
TP751
and
ground
(The
relay
circuit
|
is used.) |
Adjust to obtain the same waveform | Pin 4 (TG1) and pin 2 (TG2) of i
|
Tracking gain adj. VR750
on CH1 and CH2. *3 TP751 and ground (The relay circuit |
is used.)
Check
again
the
HF
signal
waveform.
'
Set
TEST
MODE
5,
and
make
sure
that
track
No.
and
time
are
displayed.
Stick
black
tape
on
the
disc,
and
play
that
section
(Fig.
13-1).
(Any
mode
other
than
the
test
mode
is
acceptable.)
E28.
Focus
offset
adj.
VR700
*4
(Fig.
13-2)
Pin
6
(1/2Vcc)
and
pin
1
(FG1)
of
:
TP751
*5
Tracking
offset
adj.
VR710
Pin
6
(1/2Vcc)
and
pin
4
(TG1)
of
TP751
*7
*
4.
Adjust
to
obtain
vertically
symmetrical
waveform
(Fig.
12-1)
with
respect
to
reference
DC
level.
The
reference
level
is
1/2Vcc.
(Amplitude
of
0.5
to
1.5
Vpp)
* 2. Input oscillation frequency: 1.3 kHz, 100 mV rms
* 3. Input oscillation frequency: 1.5 kHz, 300 mV rms
*
4.
Watch
the
monitor.
Adjust
so
that
the
error
waveform
is
uniform
and
minimum
(Fig.
13-2)
and
the
audio
output
is
played
properly
without
noise
(track
jump
noise)
and
free
from
skips
and
pauses.
*
5.
The
appropriate
measuring
range
of
the
oscilloscope
is
50mV
and
0.5mS.
Connect
the
trigger
to
pin
14
(HFOK)
of
CNS700.
Trigger
the
coupling
at
DC
and
(—)
slope.
Observe
the
waveform
in
the
normal
trigger
mode.
*
6.
Watch
the
monitor.
Adjust
so
that
the
error
waveform
is
uniform
and
minimum
(Fig.
13-2)
and
the
audio
output
is
played
properly
without
noise
(track
jump
noise).
*
7.
The
appropriate
measuring
range
of
the
oscilloscope
is
0.1V
and
0.5mS.
The
trigger
is
the
same
as
*5.
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To
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):
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mode
A
disc
other
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test
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The
error
waveform
should
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=
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the
expression
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voltage”
is
used.
can
be
used.
Do
not
put
the
black
uniform
and
minimum.
(CH),
(TH),
(RH),
(UJ):
Temperature
compensation
*
Schematic
diagram
and
Wiring
Side
of
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Board
for
this
tape
on
the
initialized
section
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(ML):
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type
model
are
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prior
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1/2
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Figure
13-1
Figure
13-2
Figure
13-3
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Parts
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the
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13-4
Figure
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Figure 29 SCHEMATIC DIAGRAM (3/3)
%59 — -30-

SYSTEM-CD555ZT
WAVEFORMS OF CD CIRCUIT
2V/imS(DC}
xNo defect
Potential ; =
difference 0V— : ’
{When playing
back the disc}
sDefect to dise
(ditto) oe:
Potential
difference 0V——
(When playing +— ee
back tho disc} 2
If defect oxists. pulse-like noise as shown above
appears.
(Similar noise is found also in C2] output and
TE. FE signals.)
@ ©. 20v70. 5msiD0)
Potential :
difference OV —4
(When playing
back the disc)
© 20nv/2ms
Center 1/2Vce
(When playing :
back the disc) {| i! ae fare tat aoe
4) 0. 5V/0. 5uS(AC) OP rer Ed
ROO
REX RRRIXRRR NX
BANYA0.6.0.099.0.9,0,0,0.0050.05
AOR AEESOSOOOS
(When playing
back the disc)
In TEST MODE 3
0. 5V/1mS(DC)
In _ playback mode
0. 5V/1mS (DC)
Center 1/2Vec
In TEST MODE 2
(State where a dise is not placed.)
(The Tens is moved ST
up and down. ) >
wtf toes
seri es
xThe storage oscilloscope was used for
measurement. (On the ordinary oscillescope
the bright point appears as triangular
wave as shown above. ) 2
Spin motor PWM output
(When playing back the disc)
0. 2V710uS(DC) Pw
Usel0:1 probe to connect
50mV/0. SuSiAC)
(When playing back the disc)
UseiO:1 probe to connect
2V/0. 1#S(DC)
(When playing back the disc) ier
® lkHz 0dB
(When playing back the test disc) 7” —
1V/0. SmS{AC) :
@ 2veivive)
FOCUS ON in playback
modo and test mede:3.6V —
In stop mode: 0V—~
@ 2vaivioe
lf defect exists on the disc and in
track search mode the pulse—like
"L” Level appears as shown below.
——
In playback mode:4. 8V_.
i { : i . 3 a Oe *
lf the disc rotates and the HF signal is tuned with
the tnternal signal of 1C.°H" level appears.
a ees
TROUBLESHOOTING (CD SECTION)
When the CD does not function
When the CD section does not operate When the objective lens of the optical pickup is dirty this section may not operate.Clean the objective lens,and check
the playback operation.When this section does not operate even after the above step is taken,check the following items.
Remove the cabinet and follow the troubleshooting instructions.
"Track skipping and/or no TOC(Table Of Contents) may be caused by a build up of dust other foreign matter on the laser pickup lens. Before attempting
any adjustment make certain that the lens is clean. If not, clean it as mentioned below.”
1. Turn the power off.
2. Gently clean the lens with a jens cleaning tissue and a small amount of isopropyl aicohol.
Note: Do not touch the lens with the bare hand.
;
Set a disc, turn on the power, set the FUNCTION switch to CD, and check the voltage of flat wire(1-9pin).
is the voltage as shown in the
schematic diagram being output? No
Yes
Does the LCD function? No > Check the item of “The LCD does not function”.
Yes
Does the laser go on in test mode 1?
1 Check the item of ‘The laser does not go on”.
Yes
Is test mode 1 switched to test mode 2?
No
Check the item of “Does not focus’.
No
Yes
Test mode 2 switched to mode 3 does the No Check the item of “The spin motor’s CLV servo is defective”.
Check the power circuit of the main unit.
|
spin motor run normally?
Yes
is the output of pin 3 (HF) of TP751 flat in
test mode 4? No
Yes
When the pickup moves to a track using the Does the slide motor run? Check the item of “The slide motor does
UP/DOWN button in test mode 5, is there No Yes No | not run”.
Check the item of “HF error’.
audio output?
Check the item of “There is no audio
output’.
Yes i
When the power is turned off and then on, is
Is the pickup in switch set to OFF?
Is the pickup returned to the inner -
the unit initialized? N position? No
are OFF ON
Check the peripheral! The pickup in
The pickup in switch is defective (ON).
circuits of the control} switch is
microcomputer. defective.
Yes
Does the disc track up in order (1st track,
2nd track,...)? No
Yes
Does the disc play back several ten seconds |
even after starting playback? No
‘ Yes
Check the item of “Track searching is impossible”.
Check the item of “The slide servo does not function’.
The LCD does not function.
Is there +5 V at pin 6 of CNP951?
Yes No
Is there +5 V at pin 24 (Vcc) of 1C750?
Yes
Is there +5 V at pins 16 (ACLR) and 17
(RESET 1 OUT) of C750?
Check the PWB patierns from pin 1 of flat wire to CNP951.
Check the PWB patterns from pin 1 of flat wire to pin 24 (Vcc) of 1C750.
No
If C840 is not short-circuited, 1C750 is defective.
ts there +5 V at pin 2 of CNP951? Check the PWB pattern from IC750.
o
No
Yes
When shorting the both ends of C840, do IC750 is defective.
the pins 16 (ACLR) and 17 (RESET 1 OUT) No
of 1C750 read 0 V?
Yes
When shorting C840 for a moment, does the
LCD function?
Check the LCD PW of CD.
C840 is defective.
Bilt em

SYSTEM-CD55
Is
pin
17
of
CNP951
at
a
high
level?
Check
the
LCD
PWB
of
CD.
(Check
the
LD
ON
terminal
of
pin
9
of
C951.)
No
:
Is
there
+5
V
at
the
Q890
emitter?
No
Check
the
+5
V
line
of
pin
1
of
CNP881.
is
there
+5
V
at
the
Q890
collector?
Is
there
a
low
level
(+0.1
V)
between
Check
the
PWB
pattern
between
pin
17
N
pin
17
of
CNP951
and
R749?
No
of
CNP951
and
R749.
Yes
?
No
Check
between
pin
1 of
1C750
and
es
Is there +4.1 V at the Q890 base?
lo
Y Q890 base.
Q890 is defective.
Is
there
+5
V
at
pin
5
of
CFS700?
0
The
PWB
pattern
between
Q890
and
pin
5
of
CFS700
is
damaged.
Check the CFS700 and Flexible PWB. If they are normal, the pickup is defective.
Yes
Yes
Yes
: N
Yes
When
the
disc
is
removed,
is
the
pickup
Check
the
item
of
“The
saw-tooth
wave
for
focus
servo
does
not
output”.
moving
up and
down?
No
Yes
Is
the
focus
gain
adjusting
VR751
set
to
the
Readjust
the focus
gain.
minimum
position?
Yes
;
No
me
.
:
ls
a
waveform
output
at
pin
42
Is
a
waveform
output
at
pin
13
(MLA)
of
When
the
disc
is
set,
is the
following
fener
|
waveform input
to
pin
41
(FE
OUT)
of
C7502}
No
—
[(FE(+))
of
10750?
No
|
!C750?
Yes
|
[No
dyes
Yes
Rape
1C750
is
defective.
Check
the
flexible
|
Disconnection
of
PWB.
If
OK,
the chat
decane
Pin 37
ickup
is
defective.
(FsouT)
soles
ss
pattern
and
parts.
Is
the
waveform
shown
at
right
input
at
pin
7
The
pickup
is
defective.
(HFOK)
of IC750?
No
-
:
Pin
40
Yes
(FEOUT)
~
1C750 is defective Pin7 4V ‘
OCU Ce ee Ai,
Is there +5 V at pin 24 (Vcc) of C750? No The +5V line of IC750 is defective.
The PWB pattern is damaged.
Yes
7
5
:
Does
the
saw-tooth
wave
look
like
Check
the
C767
and
R779
(pins
22
monucar
No
|
the
following
waveform?
No
|
and
23
of
1C750).
OK,
IC780
is
defective.
qokes Yes. (The saw-tooth wave oscillates
to the positive side once.) he ae
Yes ee Bs V/
SPINES.
Check
the
peripheral
circuits
of
pin
36
(FSR
IN).
of
IC750.
If
OK,
1C750
is
defective.
-
ls
the
saw-tooth
wave
being
input
to
pin
8
of
IC700
(same
The
signal
line
between
pin
35
(FSOUT)
of
IC750
and
pin
8
of
IC700
is
waveform
as
shown
above)?
No
connected
improperly.
Yes
is
the
saw-tooth
wave
generating
between
pins
3
and
6
of
Check
the
peripheral
parts
of
C700
and
the
power
line.
If
OK,
IC700
is
1C700
(same
waveform
as
shown
above)?
No
defective.
i
Yes
Is
the
saw-footh
wave
generating
between
pins
2
and
3
The
CFS700
and
flexible
PWB
are
connected
improperly
or
the
pickup
is
of CFS700 (same waveform as shown above)? Yes | defective.
No ;
-33 —