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3. Playback Circuit
3-1. Operation during Playback
Playback Circuit is shown in Fig. 3-1.
1. System Controller IC400
System Controller IC400 outputs analog signals; L-ch from pin-134 [AOUTL] and R-ch from pin-133 [AOUTR].
System Controller IC400 outputs analog signals; L-ch from pin-134 [AOUTL] and R-ch from pin-133 [AOUTR].
2. HEADPHONE AMPLIFIER IC301
The L-ch and R-ch analog signals that are output from SYSTEM CONTROLLER IC400 are output from the HEADPHONES JACK J301 via HEADPHONE AMPLIFIER IC301.
The HEADPHONE AMPLIFIER IC301 has the power switch function and MUTE function etc. Table.3-1 shows the power control by SYSTEM CONTROLLER IC400.
The L-ch and R-ch analog signals that are output from SYSTEM CONTROLLER IC400 are output from the HEADPHONES JACK J301 via HEADPHONE AMPLIFIER IC301.
The HEADPHONE AMPLIFIER IC301 has the power switch function and MUTE function etc. Table.3-1 shows the power control by SYSTEM CONTROLLER IC400.
Table.3-1 Power control by SYSTEM CONTROLLER IC400
Description of terminal
IC400 pin-146 [PQ0]
Turning “on” and “off” the POWER SWITCH function inside HEADPHONES AMPLIFIER IC301
(H: “ON”, L: “OFF”)
(H: “ON”, L: “OFF”)
IC400 pin-147 [PQ1]
Reset signal for HEADPHONES AMPLIFIER IC301 (L:RESET)
IC400 pin-148 [PQ2]
MUTE control signal for HEADPHONES AMPLIFIER IC301 (H:MUTE)
In addition, IC301 corresponds to 2 Inputs and 1 Output. In NW-E50X series, FM Tuner IC2001 is mounted. And analog signals output from IC2001 are input to HP Amp.
IC301. System Controller IC400 controls which analog signals is output from IC301 by outputting the serial command to IC301. IC400 also controls BEEP by sending the
serial command to IC301.
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