Philips CD610 - Troubleshooting and System Diagnostics; Fault Finding and Start-up Procedure; Laser and Focus System Verification

3-1
TROUBLE
SHOOTING (FAULT FINDING TREE)
START-UP
PROCEDURE
Follow the
path of the faultfinding
tree beginning
at the
top
left.
Perform the
actions
you come
across
in
the
various
blocks.
Look at
the
various side
branches
to find
out if
the
information
you see there
applies
to
your problem.
If, for
instance,
you
find
the indication
^'cJtspfaVl
_
this
means
that no
picture
appears
on
the display.
If
you
establish
this
fault,
follow
the branch and
perform
the
recommended
actions.
Check
the signals mentioned.
In
a
number
of
branches
further
reference
is made
to
measurements
you could
carry
out.
These
measurements
are
explained
in
several tables
further
on in
this
manual.
KBSe
0-3
KBSC
0-2
DDASC3
6512
HFI
TURNTABLE MOTOR
X-TAL
TL
MC
DODS
T™
ORA
WSAB
6535 6536
DEEM
6541 ATSB
QCL
CLAB
6542
6544
6561
6542 6554
QDA
EFAB
6543 6545
6563
6543 6555
SWAB/SSM
DAAB
6564
6544
6558
SCAB
CLBD
6565
6545
SDAB
DABD
6535
WSBD
6536
MUSB
|
AM
1
KILL
1
SEE
SPECIFICATION
1
MEASUREMENT
B-3 CHECK
OF
THE
PHOTODIODES
Step
Signal
Mode
o
0
C=D
o o
El
• • •
•
#
Remarks
1 D2
power
on
-
signal
4E6E7E8
Signal
depends
on Distance lens
+
IR LED
of remote control
D1
D3
D4
<t>—0—i
T-22407A
B-4 CHECK
OF
LASER
SUPPLY
The laser, the
lasersupply
plus
the
monitor diode
form
a
feedback
system.
A
defect
in
the
lasersupply
may result
in
the destruction
of the
laser.
If, in
that
case,
the
laser
is replaced,
(=
complete
D.C.M.-unit)
the
new
laser
will
also become
defective.
However,
it is
impossible
to
check
and
repair a feedback
system
if
a
link is
missing. For
this reason the
laser supply can
be
checked
with
teh
replacement
circuit
for
laser assembly.
Step
Signal
Mode o
C=D
o
o
Remarks
1
LO
serv.
pos.
2
SK
<
§>
®
—
i
1.8CV <2.3
PRS05539
LM
<
0
>
®
—
i
170<mV <220
2
LO serv.
pos.
2
SK
1
.8<V
<2.3
PRS05540
LM
®
—
i
170<mV <220
3
LO
Power on
0V ± 0.2V
No
light
T-22407B
B-4
LASER CURRENT
ADJUSTMENT
Step
Signal Mode O
0
C=I7
o 0
El
e e
Remarks
1
-
Power off ^ ®
—
i
R3520
Ikn
-
Pre-adjustment
Ohmic
value
2
Eye-pattern
HF
Power
on
Test disc
5
play
^-0-i
- -
EYE
pattern
3
laser
current
=
voltage
across R3508
Test
disc
5
play
track
1
R3520
50
mV
DC
-
High-ohmic
measurement
T-22407C
B-5
ADJUSTMENT OF FOCUS-OFFSET
Step
Signal Mode
O
0
o 0
E|
e e
Remarks
1
-
Power
on
no disc
-
R3568
- -
adjust
for
optical
mid-position
of
the
focus motor
2
FE LAG
Play
Test disc
5
Track
1
27
R3568
400mV ±
40
mV
DC
-
fine
adjustment
T-22407D
CS 22
789