Sony Walkman WM-FX271, Руководство по обслуживанию

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5-1. IC PIN DESCRIPTION
• IC701 µPD17072GB-559-1A7 (SYSTEM CONTROL/LCD DRIVE)
Pin No. Pin Name I/O Pin Description
1 INIT O Initialize output
2, 3 NC — Not used.
4 MEGA BASS O MEGA BASS ON/OFF output (L: ON, H: OFF)
5 RADIO-ON O Radio circuit power control output
6 – 8 KEY OUT1 – 3 O Key matrix output 1 – 3
9 NC — Not used.
10, 11 KEY IN1, 3 I Key input 1, 3
12, 13 BTT-REF1, 2 I Reference voltage input for battery voltage check.
14 MUTE OUT O Mute output (Mute ON: L, Mute OFF: input)
15 SD I SD (with local) signal input
16 BAND O Radio band select output (AM: L, FM: input)
17 HOLD I Key hold input (Key input effect: L, Key input ineffect: H)
18 GND — Ground
19 EO O PLL error out output
20 VCO (AM) I VCO (AM) input
21 VCO (FM/TV) I VCO (FM) input
22 VDD2 — Voltage regulator for PLL.
23 VDD1 — Power supply pin
24 XO — Crystal oscillator output (75 kHz)
25 XI — Crystal oscillator input (75 kHz)
26 VDD5 — Voltage regulator for oscillation circuit.
27 VDD3 — Power supply for LCD driver.
28, 29 CAP1, 2 — Stabilized capacitor connection of crystal oscillation power supply.
30 VDD4 — Power supply for LCD driver.
31 – 34 COM0 – 3 O LCD driver common output
35 – 49 LCD0 – 14 O LCD driver output
50 CE I L: Clock stop, H: Normally operation
51 TAPE ON I At TAPE ON: H
52 BEEP O BEEP output
53 NC — Not used.
54 KEY IN2 I Key input 2
55 NC — Not used.
56 KEY IN4 I Key input 4
SECTION 5
DIAGRAMS