Technics ST-HD501

Pin
No.
Mark I/O /
Division
Function
20 F4IN1 I Resonance buffer amp
input terminal
21 F5F1 I Band pass filter connect
terminal / (Connected to
GND through capacitor)
22
GEQOUT1
O Tone signal output terminal
23 VOLIN1 I R ladder volume input
terminal
24
VOLOUT1
O R ladder volume output
terminal
25 BB1 — Bass boost capacity
connection / terminal(Not
used, connected to GND)
26 BUFIN I Bass boost amp (+) input
terminal
27 BUFNF1 I Bass boost amp (-) input
terminal
28
BUFOUT1
O Bass boost amp output
terminal
29 PORTA O Port A output terminal (Not
used, open)
30 PORTB O Port B output terminal
31 DV
DD
I Power supply terminal
32 CLK I Clock input terminal for
serial data transfer
33 DATA I Control data input terminal
34 LATCH I Latch signal input terminal
35 DGND — GND terminal
36 AV
DD
I Power supply terminal
37
BUFOUT2
O Bass boost amp output
terminal
38 BUFNF2 I Bass boost amp (-) input
terminal
39 BUFIN2 I Bass boost amp (+) input
terminal
40 BB2 I Bass boost capacity
connection / terminal(Not
used, connected to GND)
41
VOLOUT2
O R ladder volume output
terminal
42 VOLIN2 I R ladder volume input
terminal
43
GEQOUT2
O Tone signal output terminal
9