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CDP-502ESII/55 2ESDII/620ESII/650ESDII
FLOW
CHART
OF
BU-1C
(BASE
UNIT)
TROUBLESHOOTING
® Confirm
all connectors around BU-1C (base unit)
are secured before the following check.
[SERVO
BOARD]
POWER ON
IS OPTICAL
o
PICK-UP SET AT
SLED MOTOR DRIVE CIRCUIT
INNERMOST
IS —1.4 VOLTAGE OUTPUT AT THE EMITTERS
'
CIRCUMFER-
OF Q205 AND.Q206?
ENCE?
DO NOT OBSERVE LASER BEAM
|
NEAR THE OBJECTIVE LENS.
CHECK opera.
BE SURE TO OBSERVE MORE
Dee miee eco:
THAN 25 CM AWAY ee
DOES LASER
|
De AGe EGR
NO
ARE +B (+5 V) AND —B (—5 V) VOLTAGES
|
SEE ae TION
APPLIED TO BU-1C (BASE UNIT)?
1
CHECK.
|
YES
@fis THE VOLTAGE
NO
|
OF IC303
(ss
PJ
Pee
TERMINAL @5) +5 v?
)
4)
YES
FOCUS COIL DRIVE CIRCUIT
|
DOES FOC
@SEARCH EpeRRTER c NG
1S VOLTAGE OUTPUT APPLIED TO EMITTERS
| NO
|
"SEE PAGE
5 FOR
OF Q201 AND 202?
+1
—--—---->.-
etal Ske gel
(THREE CYCLE search' \—7\ 7
\
OPERATION IS SHOWN.)
|
YES
|
|
©
|
-
|
<D0ES DISC MOTOR
NO
CHECK FOK SIGNAL.
2
|
<ROTATE?
IS THE VOLTAGE OF THE BASE OF Q303 4.8 v?
|
|
Gee
VES
1§ THE VOLTAGE
|
OF 1C306 TERMINAL
—->+|
READ TOC
INFORMATION
CHECK OPERA.
TION WITH
DISC INSERTED.
CONFIRM THAT
NO
< Toc IS READ.
are PAGE 8.
=
DETECTION CIRCUIT
OPERATION CHECK.
CONFIRM THAT THE WAVEFORM
BELOW IS OBSERVED.
SEE PAGE 12 FOR CONFIRMING
PROCEDURE.
SCRATCH WIDTH
YES
BU-1C OPERATION
CHECK IS OVER.
@ -0.7 v?
YES
CHECK RF SIGNAL.
CONFIRM THAT THE WAVEFORM
BELOW IS
OBSERVED.
RF SIGNAL WAVEFORM.
(ay
|
|
|
|
|
|
ARR
|
OOO
OOK
A
4.4,9.0.0.0.0000.004,
1Vp-p
HERR
| 0.3V
|
|
1
I
THE DIAMOND SHAPE (0) IN
THE CENTER OF THE WAVEFORM
SHOULD BE CLEARLY DISTINGUISHED.
6
(SPL)
BU-1C
(BASE
UNIT)
5
2
2
8]
4
3
CHECKING
TOC
INFORMATION
READING
If TOC information is read correctly, the number
of selections on the disc and the total playing time
will be displayed.
The display will be as follows for YEDS-1.
i
fa
Ie
1 Ll
i | eee
eee ieee
SECOND
TRACK
MINUTE
% the number of selections
\ total playing time
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