Denon PMA-630 Service Bulletin
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SYSTEM-A
SYSTEM-B
R
SPEAKER TERMINAL
1 . Set
1. Set
3. Set
3.
4. Conf
21. Connect
2. Connect
:l 1
2. Wlrrle keeping an
3. Adiust
4. Pull
5.
the switches of the set as specif
the SPEAKER changeover switch to A SPEAKER SYSTEN4.
VOLUME
the
Turn the
terminal
Lthe R channel and
With the
Then, carry out the
speaker
terminal
Adjust VR1
output voltage to the
Insert
main
Adjust VR5
voltage
POWER
irm
that a U-shaped shortcircuiting
of the
a DC voltmeter to the A
the DC
and R-channels). The voltage
Sliduck set
VR3
output voltage to the range within 0 V
out the U-shaped shortcircuiting
of
the
the U-shaped shortcircuiting
amplifier.
at test
CONTROL knob to
swi tch off
main
amplifier.
voltmeter
+
for
19.
to 0 V, turn on the set's
eye
on the DC
preliminary
(L-channel)
main amplifier.
(L-channel)
(L-channel)
points
and VR4
and VR2
range within
and VR6
18,
19,20 and 21]| to 12
ied below.
minimum.
.
pin
is inserted between
SPEAKER
to the testpoints,
polarities
voltmeter, rise
adjustments
(R-channel)
(R-channel)
0 V
pin
(R-channel)
terminal.
of the test
POWER
described in steps 3 through 5 in a swift
pin
inserted between the OUTPUT terminal
I
mV.
10
between the OUTPUT
mV
(for
18,
19,20and21
point
swi.tch.
mV.
(10,'
power
on
14
the AC
located on
t
10
on PUX-021
located
the OUTPUT terminal
both
the L- and R-channels)
PUX-02'l
on
+
will
PUX-021
(power
PUX-021
mV)
for
be
supply by
terminal of the
(Collector
of
20
means of
(power
amplifier
(power
current:26
(power
amplif
L-channel,
the
the Sliduck
manner.
amplifier
printed
preamplifier
amplifier
circuit board) so as to bring
of the
board) so as to bring the speaker
printed
mA
preamplifier
of the
printed
ier
-
preamplifier
and INPUT
board)
-
(22
board)
for
21, and
from
0 V to Rated
terminal of the
so as to bring the
mA)).
30
and INPUT
(for
both
-
for
18 of
V.
the
and INPUT
A1
After
completing the
aging
of 15
2.
Again,
0V110mV.
Pull
out
minal
of
Adjust VR'l
0Vt10mV.
With
this, all necessary adjustments
Insert
the U'shaped shortcircuiting
the main amolifier.
Again, adjust
(Collector
With
this, all
CAUTION:
preliminary
minutes has
adjust VR3
the U-shaped shortcircuiting
main
the
current: 36 rnA
necessary
Particular
voltage
(L-channel)
amplifier.
(L-channel)
(L-channel)and
VR5
adjustments
attention
of approximately
taken
and
t
2
should
place
and
VR2
mA).
50
adjustments, the
following
(R-channel)
VR4
pin
inserted between in OUTPUT terminal of the
(R-channel)
for
speaker terminal
the
pin
between the OUTPUT terminal
(R-channel)so
VR6
for
idling current have been cornpleted.
the
pard
be
to the subradiator section
V is being applied to that section.
following main
completion
so
in a manner to bring the
as to
preliminary
the
of
as to bring the speaker terminal
voltage have
bring
the
-2-
adjustments
been completed.
of the
test
of PUX-021
;
are to
adjustments.
speaker
preamplifier
point
voltages to the
14A,r":o
""L;u9l
be
carried out, but only
voltage to
preamplifier
output voltage to
and the INPUT terminal ol
range
(power
amplifier
oF'Asc
wu*
9
range within
the
and INPUT ter-
the range within
within
1711mV
printed
*
+
board) as
bt'tc
after
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