Table of Contents
Advertisement
KRC-999 IT
CIRCUIT DESCRIPTION
Terminal Name
Description
Buzzer output
Operation buzzer output terminal which outputs two types of square waves.
_
75ms
f=1KHz
75ms
75ms
75ms
@
f=1KHz
@ Buzzer sound (1) beeps in the following cases:
© When al! audio circuitry switches are ON.
oO When tape circuitry switches are ON in Tape mode.
© During forward loading or inversion from reverse to forward.
o When tuner circuitry switches are ON in Tuner mode.
e Buzzer sound (2) beeps in the following cases:
© During reverse loading or inversion from forward to reverse.
ee
| Serial input
Input terminal for serial data from the Slave microprocessor.
| Seriaj output
Output terminal
for serial data to the Slave microprocessor.
| Serial clock
Output terminal
for serial clock to the Slave microprocessor.
Active ''L"'.
SCK REO
Clock request signal
Input terminal for serial clock request from the Slave microprocessor.
VR STB
Volume strobe
| Output terminal
for strobe signal to the electronic VR (TC9188F).
DATA
Data output
Output terminal for data to the electronic VR (TC9188F) and
lexternal PLL (LM7001).
Clock signal
i
Output termina!
for clock to the electronic VR (TC9188F} and
external PLL (LM7001).
as
| Chip enabte
Chip enable output to the external PLL {LM7001).
GEQINH |
Graphic equalizer
inhibit signal
| Output terminal for inhibiting the G.EQ key matrix.
|"H" when ACC is OFF.
KGO~KG2
| Graphic equalizer
Output terminal for ON signals to the frequency select keys of the G.EQ.
The keys for the 7 bands are turned ON with a simulative method using the
3-bit BCD output from uPD4028B.
TUNER PC OUT
|
|
Tuner power contro! output
""H" when the tuner is ON and the signal circuitry is switched to the tuner.
However, both TUNER
PC and TAPE PC are "H" during tuner call.
Local/DX
| Local/de-luxe switching
| output
Output terminal for receiving only local stations or not.
AGC CUT OUT
AGC CUT output
AGC CUT output terminal.
MOTOR
+B
Motor power supply signat
Output terminal for motor power ON/OFF signal.
NC
NC
Not connected.
VDD
Power supply terminal
Device power supply terminal. When the terminai rises from OV to 5V +10%,
the microprocessor performs the power-on resetting internally, and all
| conditions are initialized.
C-ST SIG IN
C-ST signal detector
External tuner field strength detector terminal.
TUNER
PC IN
Tuner power control detector:
External tuner power control detector terminal.
RESET IN
External input detector
Detects the power control of the external set such as a CD player or DAT player.
TUNER
PACK
Tuner pack detector
Detects if the tuner pack is present.
19
Advertisement
Table of Contents
