Onkyo A-R700 User Manual

‘ADJUSTMENT PROCEDURES
Adjustments and Checking the Protection Circultry
1. Preparations
1}
Place
the
unit
on
the
workbench.
(There
should
be
about
15
mm
of
space
between
the
base
plate
of
the
unit
and
the work surface.)
2) Set up the unit as follows.
(1) No load
(2} No signal
(3) Volume turned all the way down
(4) Speaker switch OFF
(5) Power switch OFF.
Note} Check the following points before making adjustments
(1) The power switch should be OFF.
(2) The interior of the unit should not be warm.
' 2, Idling current adjustment
1) Turn the power switch ON and allow the unit to warm up for about 10 minutes.
(1) Adjust R535 (R536) so that the voltage at test point VCT-ITD on the NAAF-3915 circuit board i is l5mVt5mV.
_ Note) Semi-fixed resistors enclosed in parentheses ( ) are for the right channel.
3. Check of operation of protection circuitry
1} Check of operation of protection relay
(1) Confirm that the relay turns ON approximately 5 seconds after the power switch is turned ON.
_ (2) The relay should turn OFF approximately 0.5 seconds after the power switch is turned OFF.
2) Check of BC detection and servo circuitry operation
(1) Turn the power on with no load.
(2)
After.the
speaker
relay
turns
ON,
apply
DC+200mY
to
the
CD
input
terminals.
Confirm
that
the
relay
turns
OFF.
(3) Confirm that operation is the same as (2) above when an input of DC-200m¥V is applied.
Note) Under no circumstances connect a load or short the speaker terminals when performing the above test.
3) Signal input from the circuit illustrated below with no load.
(1) Confirm that the speaker relay does not turn OFF even when a 2 ohm load is connected when a peak value of 35V
P-p is output.
(2) Next, confirm that when a 1 ohm toad is connected the speaker relay switchse OFF and ON a coupie of times
and then stays OFF.
Note) The period before that relay stays OFF should not last for more than 1 minute. -
Relay OFF status can be canceled by switching the power OFF.
Low-frequency
oscj] lator : Auplifier
oo SP Load
OUT nent
Attenua-
tor
Biffere-
ntiator
Square wave The unit's volume
50Hz, i0¥ p-p control may-also
be used. —
3.3KQ 0.1 uF | 3.3 KQ OUTPUT
Square wave input from
—low=frequency oscillator. 10 KQ
50 Hz, 3O0¥ p- p :

Onkyo A-R700 Specifications

General

Brand	Onkyo
Model	A-R700
Category	Amplifier
Language	English