Revox C221 User Manual

FÄ/ox
C221
CD Player
Service Manual
6.7 Signal-to-noise
ratio, weighted
{-
To measure
the signal-to-noise
ratio
proceed
as
follows:
o
lnsert the test CD
"Audio
Signals Disc
'1".
.
Left-hand channel:
Connect the AC voltmeter via an A-filter
to
the PHONO socket
26 L.
.
Right-hand channel: Connect
the AC voltmeter via an A-filter
to
the PHONO socket
26 R.
.
For measuring at digital silence
without
preemphasis play
track
number 49.
.
For measuring at
digital silence with
preemphasis play
track
number 50.
(-
The
signal-to-noise
ratio
of both channels should
be at least
95 dB
without
preemphasis
and 98 dB with
preemphasis.
6.8
Phase linearity
(r
To measure
the
phase
linearity
proceed
as
follows:
r
lnsert the test
CD
"Audio
Signals Disc 1".
.
Left-hand channel: Connect the oscilloscope to the PHONO
socket 26 L.
.
Right-hand
channel:
Connect the
oscilloscope to the PHONO
socket
26 R.
.
Play tracks number 56
and 57.
r.r
Evaluate the square-wave
signals at
'1000
Hz and the
pulse
signals.
The curve shape
should be symmetrical.
6.9
Listening test
c-
The Philips CD
"Test
Sample
5A" contains the
following
simulated errors
with
which the
error correction of
the
system can
be checked:
.
lnformation interruptions of
300
pm
to 900
pm -
track numbers
5to9.
.
Black dots of 300
pm
to
800
pm
-
tracks number 11 lo 17.
.
Simulated
fingerprints
-
track numbers 18
and
19.
(.-
The simulated defects should not cause drop-outs
during
playback.
44

Revox C221 Specifications

General

Brand	Revox
Model	C221
Category	CD Player
Language	English