Onkyo A-R700 User Manual

CIRCUIT DESCRIPTION
INPUT SELECTOR
The INPUT SELECTOR is switched over.using a rotary encoder driven by a motor. When the INPUT SELECTOR is
switched over with an input switch or the remote controller, an UP/DOWN signa! is output from the microprocessor(Q801
.LC6520H)to start the motor. By monitoring the output of -the encoder, when the required position is detected, the motor is
stopped.
‘The relationship between the INPUT SELECTOR positions and encoder outputs are explained below.
ANGLE( °) _ © 30,60 90 120 150 180 #0 240 270 300 ‘a80 sE010)
i | { | I | | | i
ENCD!—4 | ot p++ |
ENCD 2 ! oa
| |
j | F { i I
Sean ee Ne ae ee OS a es
ide a CY OO WT 6 = Oe 2 ae
eNcd Simin ——_
ie pee [5 -@ 3 Je i ed 1 |
j | | j j ' | 5 \
INPUT
SELECTOR
The INPUT SELECTOR actually operates as described below.
1} When the position is switched over with a key or the remote controller, SEL UP or SEL DOWN is output from the
microprocessor to turn the selector in the direction which is nearer to the present position. (The increasing direction is UP,
and the decreasing direction is DOWN.) -
2) ~While observing the input of the ENCD5 signal from the microprocessor, the 4-bit input code from ENCD4-ENCD1 is
read at the point where the signal changes from“H”to“L”, and when the code of the target position is detected, the motor
will stop. When the code is different, the motor will rotate further and the same 4-bit code will be checked at the next point
where the ENCDS input changes. The same operation will be repeated until it reaches the target position.
3) If the target position cannot be reached within 10sec., since the SEL. UP/DOWN signal is output, the INPUT SELEC-
TOR of the target position will flash (error display).
4) When the target position is changed before the selector reaches the first target position, it responds immediately, and
changes the direction of rotation to the oen which is nearer to the new target position.
Operation when ROWER is switched ON
When the POWER is switched on (RES input “L”->“H”), the port and RAM will be initialized, Then, the levels of the ini-
tial MODE and BACK inputs are read to determine the required operation. The POWER and MUTING terminals of the
‘Microprocessor should be off when the memory is not backed up. When it is backed up, it should be set to the same condi-
tion as before power went down.

Onkyo A-R700 Specifications

General

Brand	Onkyo
Model	A-R700
Category	Amplifier
Language	English