Pioneer VSX-C501-S, Service Manual

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7.1.3 Specifications of Speaker Detection
mute
10 k
Ω
47 k
Ω
POWER AMP (IC3301)
Detection of the center speaker
Check signal from microcomputer
Detection signal to microcomputer
Mute
About 8
Ω
1. Purposes
Automatic detection of connected speakers and automatic selection of settings appropriate for the detected speakers allow you to easily
play surround-sound without your making cumbersome speaker settings.
2. Speaker detection method
Automatic detection of connected speakers starts 1120 ms after the power is turned on.
• Detection of the center and surround speakers
The microcomputer sends a detection signal and reads the logic of the response signal to judge whether the speaker is connected or not.
The response signal is read at A/D input, and a voltage of 3 V or more is judged as no speaker connected.
• Detection of the subwoofer
The logic of the signal from the phono jack with a switch is read by the microcomputer to judge whether a speaker is connected or not.
3. Speaker settings
According to the results of detection, speaker settings are made as shown below.
Rules: The setting for the front speakers depends on whether a subwoofer is connected or not. If a subwoofer is connected, the setting for
the front speakers is "small." Settings for other speakers are "small" or "not connected" depending on the results of detection.
Settings for the surround back speakers are in effect only when surround speakers are connected.
4 User's settings
More detailed speaker settings can be made in Setup mode. Once the user's settings are made in Setup mode, those settings have priority.
However, if the configuration of connected speakers changes, then the detection results become valid and have priority over the user's
settings until new user's settings are made.
5 Detection circuit for the center speaker
Satellite speakers may be connected.
Results of the Detections Speaker Setting
Center SP Surround SP Surround Back SP Sub-woofer Front SP Center SP Surround SP Surround Back SP Sub-woofer
Connected Connected Connected Connected Small Small Small Small ON
Connected Connected Not connected Connected Small Small Small Not connected ON
Connected Connected Connected Not connected Large Small Small Small OFF
Connected Connected Not connected Not connected Large Small Small Not connected OFF
Connected Not connected Connected Connected Small Small Not connected Not connected ON
Connected Not connected Not connected Connected Small Small Not connected Not connected ON
Connected Not connected Connected Not connected Large Small Not connected Not connected OFF
Connected Not connected Not connected Not connected Large Small Not connected Not connected OFF
Not connected Connected Connected Connected Small Not connected Small Small ON
Not connected Connected Not connected Connected Small Not connected Small Not connected ON
Not connected Connected Connected Not connected Large Not connected Small Small OFF
Not connected Connected Not connected Not connected Large Not connected Small Not connected OFF
Not connected Not connected Connected Connected Small Not connected Not connected Not connected ON
Not connected Not connected Not connected Connected Small Not connected Not connected Not connected ON
Not connected Not connected Connected Not connected Large Not connected Not connected Not connected OFF
Not connected Not connected Not connected Not connected Large Not connected Not connected Not connected OFF