Onkyo DX-C201 - Page 14

18) orth
DX-C101
INDIVIDUAL
CONDITIONS
CONTROL
BLOCK/MAJOR
PART
OBSERVATION
POINTS
®
Does
focus
loop
servo
No
Focus
error
amplifier
operate?
1C-101,
1C-102,
1C-103
Yes
Does
tracking
loop
servo
|
No
System
CPU
circuit
operate?
IC-401
Servo
control
circuit
Yes
1C-101
Tracking
error
amplifier
1-102,
1C-103
Optical
pickup
Tracking
coil
(none
repairable)
Does
traverse
servo
operate
No
System
CPU
circuit
=HOW
TO
CHECK
THE
TRAVERSE=
correctly?
IC-401
*
The
sound
skips
every
few
Traverse
drive
circuit
seconds
in
play
mode.
Yes
1C-102,
IC-103,
*
Optical
pickup
moves
outward
or
1C-104
inward
alternately.
Traverse
coil
*
Optical
pickup
sticks
at
inner
or
outer
position.
Is
DSL
circuit
in
normal
No}
system
CPU
circuit
mode?
10-401
Yes
=HOW TO CHECK AGC CIRCUIT =
* The level of 1C-101 pin @ (ARF
signal) becomes 0.4 Vp-p.
Is RF signal converted by the |No| Auto gain contro! circuit
AGC circuit to on ARF signal 1C-101
with a constant amplitude?
Yes
Is
ARF
signal
converted
by
No
Data
slice
circuit
=HOW
TO
CHECK
SRF
CIRCUIT=
DSL
circuit
to
SRF
signal?
IC-102
*
Check
(SRF
signal)
at
(C-102
pin
@.
Yes
ts
SRF
signal
synchronized
No)
Phase
loop
circuit
=HOW
TO
CHECK
SYNCHRONIZE
=
with
PCK
signal?
IC-301,
1C-102
*
Check
1C-102
pin
@
by
Yes
oscilloscope in triggered mode with
RF signal and if output waveform at
IC-102 pin @ can be synchronized
in-phase, the level 1C-301 pin @
becomes 2.5 volts.
Is CLV servo changed to NO} CLV circuit =HOW TO CHECK PHASE
phase-comparison
mode?
10-301
COMPARISON
=
* Check waveform at IC-301 pin @
Yes (EC signal).
Are
both
EFM
and
PCK
clock
NO!
phase
loop
lock
circuit
=HOW
TO
CHECK
EFM
AND
PCK=
signal
activated?
IC-102
*
Check
IC-102
pin
@ for
EFM
Yes
waveform.
* Check IC-102 pin @ for PCK
waveform.
No
9
ls audio signal activated? DIA converter clrcult
1C-801
Yes
LPF
circuit
IC-802,
IC-803
NORMAL OPERATION