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CIRCUIT DESCRIPTION
Output Port Description
Pin
No.
Pin Name
Operation Description
Strobe Pulse (for electronic volume).
pau
Active high.
DOLBY NR.
Active high. (Should be OFF during tuner call
or when DK interrupt is engaged.)
Outputs the signal when DOLBY is ON. This
is effective in the tape mode only. (In one
case, it turns only DOLBY B ON, and in the
other case, it turns ON for both DOLBY B and
C.)
DOLBY C NR.
Active high. (Should be OFF during tuner call
BIC
:
or when DK interrupt is engaged.)
Outputs the signal when
DOLBY C is ON.
This is effective in the tape mode only.
Tape/Radio selector.
Tape: High
In the tape mode, this outputs the high level
signal. However, during tuner call or DK in-
terrupt is engaged,
it becomes
low. (This
output
signal must
not be cease
due to
tape/radio mode switching during DK inter-
rupt operation.)
Tape Equalizer Mute
Active high.
in the tape mode, this outputs the high level
signal when the tape is fast-forwarded or re-
wound or in the pause mode.
Metal Tape Position
Active high.
In the tape mode, the signal is output when
the METAL function is ON.
SDK Switch
Active high.
Outputs the signal when the SDK is ON (in
either tape or radio mode).
(Output signal
should
not cease
even
when
the mode
is
changed over with SDK ON.)
12
KS
Key Source signal
25
Active high.
37
|MUTE
Audio Mute output
Active low.
Test Point, System Clock
Active high.
This outputs the pulse which is divides the
Buzzer output
39 | BZ
Active high.
This outputs a pulse of 2.7 kHz for 60 ms
when required. This buzzer tone may be out-
put twice with an interval of 190 ms.
CHIP ENABLE for DISPLAY
Active ''H''
SERIAL DATA for DISPALY
Active ''H"'
CLOCK PULSE for DISPLAY
Active ''L"'
Loudness
Active low.
With power ON, when the loudness switch is
set to ON, this output becomes low.
Option
Active low.
With power ON, when the option is set ON,
this port becomes low.
Volume Boost output
Active low. Enable only when power is ON.
Becomes low when the noise switch is ON
(only when no SDK signal is present.)
Becomes low during DK interrupt (only when
the SDK signal is present.)
Outputs
the power
control
signal
(for the
subsequent models).
Active low.
Active low.
Effective only in the tape mode.
Outputs the rewind solenoid control signal.
Active low.
Effective only in the tape mode.
Outputs the Play/Program
solenoid control
signal.
Active low.
Effective only in the tape mode.
Motor Drive
Active low.
Effective in the tape mode only. It becomes
low when the motor is rotated.
Power Control of this unit.
Active low.
It is always low with the power ON.
FM Band output
Active low.
During
tuner
call in both
radio
and tape
modes, this outputs a low level signal when
the band is set to FM with the SDK signal
ON.
MW Band output
Active low.
During tuner call in both
radio and tape
modes, this outputs a low level signal when
the band is set to MW with the SDK signal
ON.
13
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