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RC-999I1
DESCRIPTION OF COMPONENTS
ELECTRIC UNIT (X25-3010-11)
Component
Application/function
Operation/condition/compatibility
Ic1
Master microprocessor
| key input, etc.
Controls the Slave microprocessor, EV (electronic VR), P-CON, display,
Ic2
Slave microprocessor
Controls the cassette mechanism, pocket 'drive (motor),
deck circuit (Metal, Dolby, FF/REW), etc.
IC3
Reset IC
Resets the Master and Slave microprocessors when VDD (5V) drops 16
the specified voltage (4.6V).
Mechanism control
Drives the cassette mechanism based on the control signals
from the Slave microprocessor.
Pocket motor driver
Drives the pocket motor.
Electronic VR
Electronic VR for tone control, loudness, balance and volume. —
Electronic vR (Tone control)
Tone control.
Electronic \ VR (Buffer)
| Buffer.
_ Preamp
Output amplifier.
Preamp
Front- output preamplifier for 'fader,
Comparator _
Shape the cassette mechanism rotation 'detection | signal.
Tune select amp
Tune selection control amplifier.
Reference voltage
Bias voltage for auto- 'volume ICs.
Auto-volume
Auto-volume
Full- -wave rectification for the microphone amplifier and 2nd and 3rd LPF.
Logarithmic amplifier buffer.
Auto- -volume
Tape equaiizer
Level- shift buffer.
Tape equalizer amplifier.
Prohibit door EDpstieloss at ACC OFF.
Lamp display
Muting
Motor +B
"Tuner AGC 'inverter —
7 Tuner | 'LO/DX inverter
Inverter
,
[Tuner
IN
P- CON IN
Buffer
"Speaker driver
7
Muting driver
r
i: | Detects ON/OFF of P- CON | (microprocessor le level shifting).
"| Drives 50 and 51.
"Turns a39 and 40 ) ON when ACC goes 'ON.
i Used when, the tuner pack } is attached.
=
2
=
| Detects ON/OFF 'of the external 'tuner (microprocessor inverter).
| Buifer for sending tuner PEL data « at low impedance. —
| Drives speakers,
"Combined with IC3 and | resets 'the Slave f microprocessor.
Reset. switch for the power to 1C3 and O24. Power is turned ON/OFF
by the reset switch on the panel.
Tuner sD inverter
Tuner ST inverter
Cassette mechanism driver
Cassette mechanism driver
Cassette mechanism +B
| External remote control signal buffer.
Used when the 'tuner pack is attached.
Used when | the tuner pack is attached,
| Drives the cassette mechanism.
Lee
the current for used with the cassette Mechanism driver,
5V
In. combination with a6, turns the pocket 'motor +B, etc., ON,
: 'Plunger driver
For holding door plunger. _
__ Plunger driver
| Drives O41.
_Plunger driver
Drives the door plunger.
Plunger driver
Drives O42.
Q46~49
;
Gain selector
Switches the amplifier output voltage.
Q50,51
: "Muting
Mutes the output amp. _
Q52 53
Muting
Muting,
Q54,55
~ ~
ACC detector
Detects the rise of ACC above the specified voltage,
and performs level shifting to 5V.
O60~62
Tune select sensitivity switch
14
Changes the time constant during tune selection, "playback and FF/R Ew.
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