Sony SPP-M920 Primary, Service Manual

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Pin No. Pin name I/O Description
1 AOP O Anlog audio output terminal.
2 AON O Anlog audio output terminal (Turn over output).
3 AIN I Anlog audio input terminal.
4 AV
SS
1 – Anlog power supply terminal (Ground).
5 CFILT O V
CC
dc bias filter terminal.
6 IREF O Current reference output terminal.
7 AV
CC
1 – Anlog power supply terminal (+3V).
8 TST1 I Mode selection monitor terminal.
9 MODE 0 I Established basic operating mode.
10 MODE 1 I Established basic operating mode.
11 ROW 0 I Key matrix scan input terminal.
12 ROW 1 I Key matrix scan input terminal.
13 ROW 2 I Key matrix scan input terminal.
14 ATE EN I Enable terminal for automatic testing equipment.
15 ON CRAD I Charge detect terminal for handset.
16 COL 0 O Key matrix scan output terminal.
17 COL 1 O Key matrix scan output terminal.
18 COL 2 O Key matrix scan output terminal.
19 OFF-HOOK O Telephone line 1 ON/OFF control.
20 OFF-HOOK O Telephone line 2 ON/OFF control.
21 DV
SS
1 – Digital power supply terminal (Ground).
22 DV
CC
1 – Digital power supply terminal (+3V).
23 SDIN I Serial data input terminal.
24 CAR DET I Carrier frequency detect terminal.
25 CAS DET I CAS signal detection terminal of CID CW.
26 RING DET1 I Ringer signal detection terminal of line 1.
27 RING DET2 I Ringer signal detection terminal of line 2.
28 LINE DROP1 I Line drop (external off hook) detect terminal for line 1.
29 LINE DROP2 I Line drop (external off hook) detect terminal for line 2.
30 FST CHG O Charge current control terminal.
31 PSTN O
Chip enable and output enable to the ROM (IC13).
(EXTERNAL ROM VERSION ONLY)
32 DV
CC
2 – Digital power supply terminal (+3V).
33 DV
SS
2 – Digital power supply terminal (Ground).
34 – Not used (Open).
35 – Not used (Open).
36 A14 I/O Address bus (EXTERNAL ROM VERSION ONLY).
37 ALE O Address latch enable (EXTERNAL ROM VERSION ONLY).
38 A08 I/O Address bus (EXTERNAL ROM VERSION ONLY).
39 A09 I/O Address bus (EXTERNAL ROM VERSION ONLY).
40 A10 I/O Address bus (EXTERNAL ROM VERSION ONLY).
41 A11 I/O Address bus (EXTERNAL ROM VERSION ONLY).
42 A12 I/O Address bus (EXTERNAL ROM VERSION ONLY).
43 A13 I/O Address bus (EXTERNAL ROM VERSION ONLY).
44 CID/ATE RX I Caller ID data input/ATE RX data input.
45 ATE TX O ATE TX data output.
(BASE UNIT SECTION)
IC8 AM79C491JC-C10 (SYSTEM CONTROL)
SECTION 6
DIAGRAMS
6-1. EXPLANATION OF IC TERMINALS