Zenith XBS344 Series Service Manual page 59

Combo home theater system
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3) RS232 waveform during procedure(Downloading)
4) Flash R/W enable signal during download(Downloading)
FIG 1-3
FIG 1-4
3-65
TXD(J501 PIN3)
RXD(J501 PIN 2)
FRD(IC5A1 PIN 28)
FWR(IC5A1 PIN 11)

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