Onkyo TX-DS474 Service Manual - Page 15

Idling, current, adjustment, NAAF-6495, Confirmation, protection, circuit

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TX-DS474 Idling current adjustment Before Idling adjustment, turn the trimming resistors R573, R574, R673, R674 and R1532 to counter clockwise. Connect the DC voltmeter to sockets P511,P512, P611, P612 and P1511. After turn POWER to ON, adjust the trimming resistors R573, R574, R673, R674 and R1532 so that the reading of voltmeter becomes 2.5 ±0.2mV. After adjustment, attach the top cover. Confirm the voltage of above points after five minutes. Readjust the above resistors so that the voltage becomes 6.5 -±0.2mV. Note: No load and No signal CID N - 8 N CC U L.) P1511111 , 1= i R1532 R674 P612 NAAF-6495 R673 P611 Confirmation of protection circuit 1. Confirmation of operation of speaker relay Confirm that the speaker relay turns ON approximate. 5 seconds after the power switch is turned ON. Confirm that the speaker relay turns OFF immediately after the power switch is turned OFF. 2. Confirmation of DC detection circuit Press and hold down CD button, then press SPEAKERS-MAIN and SPEAKERS-REMOTE buttons at the same time. During "TEST-" on the FL tube is displayed, press DVD button. Next, press CD button. Apply DC 1.5-3V to MULTI CHANNEL INPUT terminals with no load. Confirm that the speaker relay turns OFF. Apply DC -1.5--3V to MULTI CHANNEL INPUT terminals with no load. Confirm that the spekaer relay turns OFF. 3. Confirmation of Current detection circuit Press and hold down CD button, then press SPEAKERS-MAIN and SPEAKERS-REMOTE buttons at the same time. During "TEST-" on the FL tube is displayed, press DVD button. Coneect Differentiator below and apply the 50Hz square signal to the terminal of MULTI CHANNEL INPUT. Adjust the attenuator or Volume so that the output level becomes 30V p-p. Confirm that the speaker relay turns OFF when a 1.5 ohm load is connected.

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TX-DS474
Idling
current
adjustment
Before
Idling
adjustment,
turn
the
trimming
resistors
R573, R574,
R673,
R674
and
R1532
to
counter
clockwise.
Connect
the
DC
voltmeter
to
sockets
P511,P512,
P611,
P612
and
P1511.
After
turn
POWER
to
ON,
adjust
the
trimming
resistors
R573,
R574, R673,
R674
and
R1532
so
that
the
reading
of
voltmeter
becomes
2.5
±0.2mV.
After
adjustment,
attach
the
top
cover.
Confirm
the
voltage
of
above
points
after
five
minutes.
Readjust
the
above
resistors
so
that
the
voltage
becomes
6.5
-
±0.2mV.
Note:
No
load
and
No
signal
N
P15
,
11111
1=
i
R1532
P612
P611
-
8
U
L.)
R673
CID
N
CC
NAAF-6495
Confirmation
of
protection
circuit
R674
1.
Confirmation
of
operation
of
speaker
relay
Confirm
that
the
speaker
relay
turns
ON
approximate.
5
seconds
after
the
power
switch
is
turned
ON.
Confirm
that
the
speaker
relay
turns
OFF
immediately
after
the
power
switch
is
turned
OFF.
2.
Confirmation
of
DC
detection
circuit
Press
and
hold
down
CD
button,
then
press
SPEAKERS
-MAIN
and
SPEAKERS
-REMOTE
buttons
at
the
same
time.
During
"TEST-"
on
the
FL
tube
is
displayed,
press
DVD
button.
Next,
press
CD
button.
Apply
DC
1.5-3V
to
MULTI
CHANNEL
INPUT
terminals
with
no
load.
Confirm
that
the
speaker
relay
turns
OFF.
Apply
DC
-1.5--3V
to
MULTI
CHANNEL
INPUT
terminals
with
no
load.
Confirm
that
the
spekaer
relay
turns
OFF.
3.
Confirmation
of
Current
detection
circuit
Press
and
hold
down
CD
button,
then
press
SPEAKERS
-MAIN
and
SPEAKERS
-REMOTE
buttons
at
the
same
time.
During
"TEST-"
on
the
FL
tube
is
displayed,
press
DVD
button.
Coneect
Differentiator
below
and
apply
the
50Hz
square
signal
to
the
terminal
of
MULTI
CHANNEL
INPUT.
Adjust
the
attenuator
or
Volume
so
that
the
output
level
becomes
30V
p
-p.
Confirm
that
the
speaker
relay
turns
OFF
when
a
1.5
ohm
load
is
connected.