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Pub. 42004-615L2
Model 670-801-EX and 670-801-UL SmartSeries Amplifiers Page: 5 of 15
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Block Diagram
Figure 5. Model 670-801 Block Diagram
As shown on Figure 5, P1 is the 16-pin male connector located on the back of the Base-16 PCBA. It
plugs into the socket located inside the cast aluminum enclosure. The socket provides connection to the
multi-party cable containing the page/party lines and ac power.
The Base-16 PCBA conducts ac power to the Bias Power Supply PCBA through connector J6 and
receives +5 V dc and +/-15 V dc in return. The Base-16 PCBA uses the bias supplies and also passes
them (as well as control, monitoring, and line signals) to the FSK Modem PCBA via J1, a 24-pin stacking
connector. Connector J2 on the Base-16 PCBA connects the speaker transformer for the station’s external
speaker, and J3 connects optional external devices.