Technics SA-X800L - Page 18

e C801 (LC6523C — 3068) Microcomputer Notes:
(A) Key matrix, scanning signal input/output pins and their
functions (“H” level scan)
Mark Description
® LED 4 “L" level output is given 2
8) LED 5 to each pin according to @ © mark
@ LED6 | the volume attenuation in 9 Dat act aueti
© fepae | order to light up the =
volume level LED. ra)
LED
1
:
@® LED2 | °
@ LED3 |
® BACK-UP @ When this pin is at ‘’L“’ level, the microcomputer is operated by the back-up circuit.(No. 49 pin
alone receives an input, all the others not.) (B) Volume UP/DOWN (C) Balance LEFT/RIGHT
@ When this pin is at “H" level, No.@)pin (POWER ON) gives an ‘’L”’ level output if No. @Q pin 1. Push the key once, and the volume will turn up (or 1. Push the key once, and the balance will shift to the
(POWER SW) is at ‘’H” level. No.g@pin (POWER ON) is at ‘H"’ level, however, if the remote down) by 2dB each steps. left (or right) channel by 2dB. At the same time, the
control’s power on/off RAM data are off. 2. Keep the key depressed for more than 250msec, and “Volume/Balance’’ indicator (LED1 ~ LED7) is
®M REMOTE ®@ Data codes reach here from the remote control receiver. (For data codes, refer to the remote the volume will turn up (or down) all the way auto- switched to the Balance position. (The Balance indica-
control transmitter description.) ° matically. tion goes on for about 4 ~ 6 seconds after the Balance
@ The compact disc player’s data codes are outputted from the light receiver direct to the player. 3. An ‘'L” level output is given at LED1 ~ LED7 pins key is released.)
AMP @ When this pin receives an ‘’H”’ level input, the amplifier turns on to start the operation. according to the volume attenuation. 2. Keep the key depressed for more than 500msec, the
@ When this pin receives an ‘’L" level input, the amplifier turns off to stop receiving the matrix automatic shift mode will be invited.
key. Power on/off code alone is used to enable the remote control.
@ Just when this pin’s input comes from ‘‘H”’ to “‘L" level, the LED1 ~ LED7 and LOUD pins
become ‘’H”.
: 2 °1C802 (DN74LS145) BCD Decoder
g)
POWER
ON
@
Arising
level
(‘‘H”
level)
is
detected
at
No.
(0)
pin
to
give
an
“L”’
Jevel
output
to
No.@)pin
;
(
)
hog.
e microcomputer codes are fed via its No. @ ~
(NC) (POWER ON). Th ter (IC801) cod fed ts No. @
POWER SW | @ When No. @ pin is at “L” level, No.@pin is given an ‘‘H’’ level output (POWER OFF). No. @ pins to the IC802’s No. @ ~ No. ® pins. An ‘'L”’
ay DECK Not used in this unit. level output is given according to the selector positions;
a2 ST/DTS @ When ‘Tuner’ code is fed from the remote control to No.@pin, now the input selector IC (1C502) receives the output as a
The DTS code is outputted at pin No. @ SELECTOR code is switching signal. (For the input codes to C802, refer to
then outputted to make the input selector into TUNER mode. the list of codes under No. @ ~ No. @ pins of IC801.)
@ \|f the remote control’s CH button oT OF
has been kept depressed for longer | Function | No- of output |
than 1.5 seconds, 15 output pulses 12.5ms eae |e —
(AM code) are fed to the tuner and rensicui| 2
the number of pulses for a specified _.. | [en4tcHi2)| 3 ~| TURNTABLE
channel is given. Pe Se pens ten tai{ ___4_]
@ |f the button has been released e pata crise pens ten ua) ___5_
within 1.5 seconds 13 output pulses to the code 7 STOP START VCR1 TAPE CD/AUX TUNER PHONO
(FM code) are fed to the tuner and DTS code bulees FM 13
the number of pulses for a specified Lee ee |
channel is given.
@® DATA/S1 Together with No. @ pin, Volume UP/DOWN, Balance L/R and Loudness signals are fed to the
@® CLK attenuator IC.
® { OSC2 Crystal hook-up terminals for internal clock oscillator.
OSC 1 Dp De Og Da
RES Reset pulse input terminal. BCD Code IN
When a reset is made by the back-up circuit using electrolytic capacitors alone, 3 or 4 control RAM
data are checked by the program. COLD START is activated when abnormal, HOT START when .
normal. ¢ 10502 (LC7818) input Selector
20 K2 Input terminals for matrix keys.
@)
K1
(Refer
to
Note)
cp
@ KO cD
@ | Da/SO | Input selector 4-bits BCD codes are PHONO
Cz) Dg outputted with Remote Control! codes. xe: selector oA OB oo SHENG ir
3)
De
*
With
Turntable
“START”
code,
the
2
PHONO
L-JZE
L
e
@
D
7
output
is
given
in
the
order
of
No.
1
3
TUNER
L
L
7
Depo
ae
ry
ape
D + No.2 > No.6 > No.1. 4 CD/AUX L H L tT
:
,
:
5
TAPE
|
oc
fou
L
TUNER
e
TUNER
6 TURNTABLE START | H | OL L >
No.
8
code:
7
|
TURNTABLE
STOP
|_H
L
H
S
Not provided in this unit’s with *[ 8 VCR2 oe st H H =
remote control. 3 WOR E = a SOURCE OUT
OD) LOUD Loudness on/off signal output terminal.
(NC) * By pressing the LOUDNESS key, an “‘Llevel output is given at this pin to turn on the loudness
switch. Push the key again, and an ’’H” level output will come to turn off the loudness switch.
413 aie