Sony Walkman MZ-R900, Service Manual

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33
MZ-R900
6-6. IC PIN FUNCTION DESCRIPTION
•
IC501 SN761057DBT (RF AMP, FOCUS/TRACKING ERROR AMP)
Pin No. Pin Name I/O Description
1 TE O Tracking error signal output to the system controller (IC801)
2 REXT — Connect terminal to the external resistor for ADIP amp control
3 WPPLPF — Connect terminal to the external capacitor for TPP/WPP low-pass filter
4 VREF11 O Reference voltage output terminal (+1V)
5 C I Signal (C) input from the optical pickup detector
6 D I Signal (D) input from the optical pickup detector
7 D-C I Signal (D) input from the optical pickup detector (AC input)
8 IY I I-V converted RF signal (IY) input from the optical pickup detector
9 IX I I-V converted RF signal (IX) input from the optical pickup detector
10 JX I I-V converted RF signal (JX) input from the optical pickup detector
11 JY I I-V converted RF signal (JY) input from the optical pickup detector
12 A I Signal (A) input from the optical pickup detector
13 A-C I Signal (A) input from the optical pickup detector (AC input)
14 B I Signal (B) input from the optical pickup detector
15 TON-C — Connect terminal to the external capacitor for TON hold
16 CIG —
Connect terminal to the external capacitor for the low-pass filter of NPP divider
denominator
17 CDN —
Connect terminal to the external capacitor for the low-pass filter of CSL divider
denominator
18 PD-NI I Light amount monitor input terminal (non-invert input)
19 PD-I I Light amount monitor input terminal (invert input)
20 PD-O O Light amount monitor output terminal
21 ADFG O ADIP duplex FM signal (22.05kHz
±
1kHz) output to the system controller (IC801)
22 DVDD — Power supply terminal (+2.3V) (digital system)
23 SBUS I/O SSB serial data input/output with the system controller (IC801)
24 SCK I SSB serial clock signal input from the system controller (IC801)
25 RESET I Reset signal input from the system controller (IC801) “L”: reset
26 OFTRK I Off track signal input from the system controller (IC801)
27 DGND — Ground terminal (digital system)
28 BOTM O
Bottom hold signal output of the light amount signal (RF/ABCD) to the system controller
(IC 801)
29 PEAK O
Peak hold signal output of the light amount signal (RF/ABCD) to the system controller
(IC 801)
30 VREF075 — Connect terminal to the external capacitor for the internal reference voltage
31 VC O Middle point voltage (+1.2V) generation output terminal
32 CCSL2 — Connect terminal to the external capacitor for TPP/WPP low-pass filter
33 RF OUT O Playback EFM RF signal output to the system controller (IC801)
34 AGND — Ground terminal (analog system)
35~37 EQ, LP, PS — Connect terminal to the external capacitor for the RF equalizer
38 AGND — Power supply terminal (analog system) (+2.3V)
39, 40 OFC2, OFC-1 — Connect terminal to the external capacitor for RF AC coupling
41 ABCD O Light amount signal (ABCD) output to the system controller (IC801)
42 FE O Focus error signal output to the system controller (IC801)
43 S-MON O Servo signal monitor output to the system controller (IC801)
44 ADIP-IN I ADIP duplex FM signal (22.05kHz
±
1kHz) input terminal (not used in this set)