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KA-7090R
CIRCUIT DESCRIPTION
5. TEST MODE
5-1. Test Mode using Main Unit' s Keys
(1) Setting the test mode
Turn on the power while pressing the
"LOUDNESS"
key.
(2) Canceling the test mode
- To initialize the system and cancel the test mode, turn off
the power.
(3) Contents of test mode
+ The muting during mode selection is not controlled in the
test mode.
However, the operation when the power is
turned on is the same as for the normal operation.
+ The speaker protection operation is also the same as for
the normal operation.
(4) Automatic POWER ON
+ The POWER
ON state is entered for model discrimina-
tion whenever the power is turned on while pressing the
"LOUDNESS"
key. All the functions are then initialized
and activated in the all-lighting mode.
In the all-lighting mode, the selector display LED lights
sequentially. For KAF-7002/5002, the SOURCE DIRECT
and CD DIRECT display LEDs light alternately.
For KA-
7090R, the SOURCE
DIRECT display LED lights. The
SP A and B display LEDs do not light.
All other LEDs
light.
- The all-lignhting mode is canceled when any of the main
unit' s keys is pressed.
The normal display obtained
when the selector is set to TUNER then appears.
(5) Special operation
"LOUDNESS"
key
(a) When this key is pressed, the LOUDNESS
display
LED lights and the electric volume turns up for 16 sec-
onds.
After 16 seconds, the electric volume stops and
the display LED goes off.
(b) When this key is pressed during operation or after
operation in step (a), the LOUDNESS display LED lights
and the electric volume turns down for 16 seconds.
After
16 seconds, the electric volume stops and the display
LED goes off.
(c) When this key is pressed during operation in step (b),
the LOUDNESS
display LED goes off and the electric
volume stops.
(d) The operation in step (a) is carried out when this key
is pressed after operation in step (c). After that, the oper-
ation in steps (a) to (c) is repeated every time this key is
pressed.
The operation is not canceled even if another
key is pressed while the electric volume turns up and
down.
» "SPEAKER A+B"
When the switch is set to this position, the SPEAKER A +
B LED (for only the KA-7090R) lights and the audio mut-
ing is turned on. When the switch is set to another posi-
tion, the LED goes off and the audio muting is turned off.
"MD MONITOR"
key (for only KAF-7002/5002)
When this key is pressed, the MUTE display LED lights
and the audio muting is turned on.
When this key is
pressed again, the audio muting is turned off and the dis-
play LED goes off.
- "ATT. -30dB"
key (for only KA-7090R)
When this key is pressed, the ATT. LED lights and the
ATT. -30dB is turned on during normal operation.
The
REC muting is turned on while the REC OUT mode is set
to ON. When this key is pressed again, the ATT. or REC
muting is canceled and the ATT. LED goes off.
"REC OUT"
key (for only KA-7090R)
When this key is pressed, the REC OUT LED lights and
the REC OUT mode is set to ON.
The operation is not
canceled until this key is pressed again.
The REC mut-
ing is canceled if it is on when the operation is canceled.
"8/16-bit selector switch"
(for only KA-7090R)
The system enters the all-lighting mode if this switch is
set to the 8-bit position when the ATT. key is on after the
all-lighting mode is canceled.
The serial POWER
ON
code is output at that time (code
"25H"
is output when
the test mode is activated in the 8-bit position, and code
"0800"
is output when it is activated in the 16-bit posi-
tion). The all-lighting mode is canceled when this switch
is set to the 16-bit position again or when the ATT. key is
pressed. The normal display then appears.
5-2. Serial Test Mode
(1) Setting the test mode
.
The serial test mode is entered if a serial
"71H"
code
is received only when the KA-7090R is in the 8-bit mode.
After that, only the 16-bit mode is accepted.
In other
cases, the serial test mode is entered when a serial
"C27FH"
code is received.
(2) Canceling the test mode
The serial test mode is canceled when a
"C27FH"
code is received.
In this case, the system is not initial-
ized. The serial code also remains set to the 16-bit posi-
tion.
- When the AC power (main power) is turned off, the serial
test mode is canceled and the system is initialized.
(3) Contents of test mode
.
.
The serial code for a test shown in the attached list is
analyzed for processing.
In the test mode, no mute signal is output to shorten the
input/output selection time during measurement.
Howev-
er, the operation when the power is turned on is the
same as for the normal operation.
The speaker protection operation is also the same as for
the normal operation.- The code input in the test mode by
serial communication is validated irrespective of the dis-
play mode.
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