AIWA ZR555
Service Manual

IC DESCRIPTION
IC, pPD780228-xxx-xxx Pin No. 1 Pin Name K-SCAN I REVOLA RE VOL B D-CD D-AUX
& 1

1/0 o I
,

Description Key scan output. PALS data input A for encoder volume. PALS data input B for encoder volume. CD function LED control. AUX function LED control. Tuner function LED control. Tape funtion LED control. Line Mute control for PRO-logic unit. CD unit power ON control. (H:ON) Tuner block power ON control. (H:ON) Bias oscillator control. (H:oscillation) REC MUTE control. (LREC) I TAPE 1/2 select control. (H:DECK1 play) POWER ON control for audio block. (LPower ON) Latch control for shift register. CD flash window control. (H:Light up) Extension port (connected to GND).

Pin No. 43 44 45 46 47 48 49

Pin Name I-CD-SW I-DISH I-RE-JOG I-SIG I-SPEANA I-KEY2 I-KEY1
I

1/0 I I I I I I I CD tray SW detector. CD turn-table detector. Pulse data input for rotary encoder. Tuner RDS signal level input. Data input for SPEANA light up. Tact key level input 2. Tact key level input 1. I GND input for AD transfer. FL segment scan output.

Description

I

2 3
4

I

I
I

II Io I o o
,

I
I

5 6 7

I
r

D-TUNER D-TAPE O-MUTE O-CD ON O-TU ON O-BIAS O-RMT O-CD LED O-PB1 O-POWER O-FCE

I

8 9 10 11 12 13 14 16

I

Io Io

I

50

AVSS P1-P8 P9/TM-BAsE PIO/RDS P1l/OIRT P15/PRO P16/DSP P17 P12/LW

I

o 1/0 1/0

I

I

Io
Io

51-58 59 60

I
,
I

FL segment scan output/TM base input. FL segment scan output/ RDS mode detect. FL segment scan output/ OIRT mode detect. FL segment scan output/ LW mode detect. FL segment scan output/PRO-Logic mode detect.

10
I

o
o

I

61 62 65 64 63.

1/0
1/0 1/0 1/0 1/0

I

15

I

17 18

I

Ic

Vss

1- 1 I- I 1IO 10
1

IO

o

k=
66

P13/AM.sT+FM.w P14/AM9K

FL segment scan output/AM stereo+ FM wide mode detect. FL segment scan output/Initial AM 9K mode detect.

1/0 1/0 I

FL segment scan output/DSP mode detect. FL segment scan output.

System GND. System VDD supply. CD turn table REVRSE control. (H:Reverse) CD turn table FORWARD control. (H:Forward) CD tray OPEN data output. (LOpen)

+

67

I

19
20

I
I

VDD O-DISH RVS O-DISH FWD O-OPEN

1
I I
1

I

68 69 70 71 72-78 79
80

I

P18/HP MUTE SPEANA AfP19 SPEANA B/P 20 SPEANA C/P 21 P22�P28 VDD2
-VFL

1/0 1/0 1/0 1/0

FL segment scan output/ Head Phone Mute input. FL segment scan output/ SPEANA level input timing A. FL segment scan output/ SPEANA level input timing B. FL segment scan output/ SPEANA level input timing C. FL segment scan output. System VDD supply. Power supply for FLdisplay. FL segment scan output/TAPE REC SW detect. FL segment scan output/TAPE PLAY1 SW detect. FL segment scan output/TAPE PLAY2 SW detect. FL segment scan output. FL grid scan output. � I I

I
t

21 22 23 24
25

I
1

o
O I I I
1

I I
I

O-CLOSE I I-SQ.DATA/i= I
1

CD tray CLOSE data output. (LClose) CD SUBQ data input/tuner IF count input.
CD SUBQ clock ouput / tuner mono,stereo selection input. (LStereo)

oI

I
I 1/0 I 1/0 I 1/0 I

10-SQ.CLKHI13RE0 I CLOCK/DSC

I

vo
I 1/0 I O I

26 27 28 29 30 I 31 32 33 34 35

IO

Clock output for shift register, DSP & PRO unit / DSC control for PRO unit CD sense input/Tuner PLL chip enable output. CD data output/Tuner PLL clock output.

81

P29/REC I I I P30/PBl P31/PB2 P32-P35 G13NG1

I I-SENS/O-PLLCE

I

IO-CDDATA/PLLCLKl

I I
I

82 83 84-87

I O-XLT/I-RDS CLK I I/O

I
I

CD XLT output /Tuner RDS clock input. Micon reset input. CDclockoutput/Tuner RDS data input.

o
o

I

Ei5s

111
1/0

I

88-1oo I

10-CLw-RDSDATAl PRO-CE DATA/FDSC I-RMC O-PLL DATA
I
1

o o
I o
1

Latch control for PRO-Logic IC and DSP IC. Data control for shift register, DSP & Pro unit/ DSC control for IC,M62439SP. Serial data input from remote controller. DSC control for Function IC / Tuner PLL data output. Micon clock shift output. Clock circuit VDD.
4.91MHz oscillator circuit.

36 37 38 39 40 41 42

O-C.SHIFI� VDD1
x2

o

xl Vssl AVDD HOLD I I

4.91 MHz oscillator circuit. Clock circuit VDD. VDD input for AD transfer. AC/ DC detector.

-39�

-40-