Marantz SR-12S1 Service Manual page 41

19 HPFE
20 TEST
21 BGND
22 AGND
23 VA
24 AINR-
25 AINR+
26 VCOMR
27 GNDR
28 VREFR
Note: All digital inputs should not be left floating
QA07, QU71 : PCF8574
Pin Description
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I High Pass Filter Enable Pin
"L": Disable
"H": Enable
I Test Pin ( pull-down pin)
Should be connected to GND.
- Substrate Ground Pin, 0V
- Analog Ground Pin, 0V
- Analog Supply Pin, 5V
I Rch Analog negative input Pin
I Rch Analog positive input Pin
O Rch Common Voltage Pin, 2.75V
- Rch Reference Ground Pin, 0V
O Rch Reference Voltage Pin, 3.75V
Normally connected to GNDR with a 10µF electrolytic capacitor
and a 0.1µF ceramic capacitor
57