Brother International IntelliFax-3550 Service Manual - Page 41
MFC6550MC/7550MC/7650MC/9500 only, High, Medium-high, Me
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2 Switching devices that are controlled by the ASIC 2-1: Device TEL. If 0, the equipment works as a telephone; if 1, it sends a facsimile message. 2-2: Device HSPLY. If 0, the equipment works as a telephone; if 1, it plays back a TAD recorded message. 2-3: Device TADH. If 0, the equipment works regularly; if 1, it allows you to record a message through the microphone. 2-4: Device CMLH. If 0, the equipment is placed in monitor mode; if 1, it is normally connected to the line. 2-5: Device RNG. If 0, the speaker rings; if 1, it transfers control to the device MSL. 2-6: Device MSL. If 0, the speaker works for converting line signals to sound; if 1, it works for playing back a TAD recorded message. 2-7: Device MUTE that mutes the receiver tone. 3 Speaker amplifiers 3-1: For FAX3550/3650/8000P/8200P/MFC4450/4550/4550plus/9000 3-2: For MFC6550MC/7550MC/7650MC/9500 4 Speaker volume control circuitry 4-1: VOL1 that controls the speaker volume to two levels: High and Low. 4-2: VOL2 that augments VOL1 to handle four levels: High, Medium-high, Medium-low, and Low. (MFC6550MC/7550MC/7650MC/9500 only) III - 22