Brother IntelliFax-3550 Service Manual page 41

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 fac-
simile 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 nor-
mally 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, Me-
dium-low, and Low. (MFC6550MC/7550MC/7650MC/9500 only)
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