SONY PCS-P500
Service Manual

(PCS-5100/5100P·E) 9
4. APR-011 board Be sure to operate the following switches before turning on the main power because the following switches are referred to only when the POWER switch is turned on. All the menu operations to the echo canceller mode from the display are invalid when this switch is set in the mode II or III position except the setting when shipped from the factory. CN101 I. Audio Unit In-Use Mode (Internal echo canceller is set in the single VCR mode: Factory setting mode) A-SIDE This mode presumes that the audio unit is used. When AUX or AUX + MIC is selected as the audio input, the NEAR and the FAR audio output are muted. The mute is performed to prevent occurrence of howling due to a loop that is formed inside the VCR between the audio input and output. S102: Mode setting switch ON (Set the switches S102-1 to S102-8 to ON) (Factory default position) S102

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II. Audio Unit Not-Used Mode (Internal echo canceller is set in the dual VCR mode) This mode presumes that the audio unit is not used. When AUX or AUX + MIC is selected as the audio input, the NEAR and the FAR audio output are not muted. This mode is suited when you want to use the optional microphone and speaker that are connected to the audio unit terminal and the FAR audio output. This mode is also suited to perform the simultaneous recording of the externally connected multiple VCRs and the simultaneous playback. Do not use this mode when the AUX input of a VCR is connected to either one or to both of the NEAR and FAR audio output. S102: Mode setting switch ON (Set the switches S102-1 to S102-4 to ON. Set the switch S102-5 to OFF. Set the switches S102-6 to S102-8 to ON.)

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(PCS-P500/P500P SERVICE MANUAL Volume 1)