NAD 5220 - Adjustments: Location and Focus;Tracking; Adjustment Location Overview; Focus and Tracking Offset Adjustments

ADJUSTMENTS
1.
ADJUSTMENT
LOCATION
R329 R332
TP-FEOCo) _JTP-TSO
TP-VRFF
R305
Q303
TP-RF
2.
ADJUSTMENT
PROCEDURES
AFTER
LASER
PICKUP
REPLACEMENT
2-1
Focus
DC
Offset
Adjustment
(in
TA8101N
and
R329
VR
replacement)
(1)
Set
unit
to
STOP
mode
with
power
of
unit
ON.
(2)
Connect
oscilloscope
or
tester
across
TP-FEO
and
TP-VREF.
(DC
range:
5mV/DIV)
(3)
Adjust
R329
(100K
ohm)
so
that
DC
offset
obtains
OV
+10mV.
OSCILLOSCOPE
R32
: R332
TPH=PE0LS
2-2 Focus Balance Adjustment
(1)
Connect
oscilloscope
across
TP-RF
and
TP-
VREF. (AC range: 0.2V/0.5u sec DIV)
(2) Play back YEDS-7 test disc.
(3)
Adjust
R332
(20K
ohm)
so
that
3T
component
of RF signal obtains max.
Adjust so that 3T component
of the signal obtains max.
2-3 Tracking Offset Adjustment
{in TA8101N and R315 Variable Resistor replace-
ment)
(1) Set unit to STOP mode with power of unit ON.
(2) Connect oscilloscope or tester across TP-TSO
(TE signal) and TP-VREF. (DC range: 5mV/
DIV)
(3) Adjust R315 (100K ohm) so that DC offset ob-
tains OV +10mV.
2-4 Tracking Error Balance Adjustment
(1) Connect oscilloscope across TP-TSO (TE signal)
and TP-VREF, (DC range: 0.5V/S5msec DIV)
(2) Play back YEDS-7 test disc.
(3) Short circuit Open Limit and Close Limit leaf
switch $102. Push PLAY key again, and micro-
computer will be set to test mode and tracking
error signal will be obtained.
(4)
Release
(open)
the
short
circuit
for
the
leaf
switch,
(5) Adjust R305 (100K ohm) so that DC offset of
tracking error signal obtains OV.
(6)
Push
STOP
key
after
adjustment,
and
test
mode
will
be
released.
$102
Short circuit at
3 points.
2-5 Analog Output Offset Adjustment
The adjustment below is not necessary when pickup
is replaced.
(1) Turn power of unit ON.
(2) Conect DC voltmeter or oscilloscope to pin 1
(L ch), pin 7 (R ch) of Q511 on Main P.C. Board
and GND terminal of unit.
Adjust semi-fixed resistor R545 50K ohm (L ch)
and R546 50K ohm (R ch) so that DC range off-
set obtains 0 +10mV.
OSCILLOSCOPE
TP+T90
TP-VRFF
R305
Q303
R315
Adjust so that both
levels are equal.
15
2-6 CDR Adjustment
(1)
Play
back
track
No.
20
of
YEDS-7
test
disc.
(2)
Connect
AC
level
meter
(mV,
amp
built-in)
to
FIXED
output
jack.
(3)
Set
the
level
to
OdB
with
CDR
switch
OFF.
Adjust
R601
and
R6O2
until
+6dB
(twice
the
output
obtained
with
CDR
switch
OFF)
is
obtained
with
CDR
switch
ON.
2-7
Volume
attached
to
pickup
adjustment
is
completed.