AIWA CTFX728
Manual de Servicio

Ic DESCRIPTION-2 IC, lJPDl 7709GC-51 7-399
Pin No. 1 2 3 4 5 6 7 8 9 Pin Name

I/o
]1
Tape mechanism standby input

Description

ST-BY

MS signal input (H: Track absent, L: Track present) No connection Tape end detection input I

FWD/REV mechanism position detection input
Main motor control output

*
SUB M CON2 AUX/MIC H. BASS 1 H. BASS 2 BS CONT NR B CONT SIFT PACK-IN MODE POWER MTL PL CONT CONT

Sub-motor

1 control output 2 control output switching signal output

]0 o 0 0 o o
I I I

Sub-motor AUX/MIC H.BASS H.BASS

I I

10
11 12 13 14 15 16 17 18 19

control output 1 (only display is changed) control output 2 (only display is changed) output output shift switch input I I

MWBS switching

Dolby NR ON/OFF Rotary commander

Tape inserted status detection input Tape mechanism mode pulse input Unit power control output Metal tape ON/OFF output

o 10
I O

POWER MUTE STAND BY M

Muting

output to power amp

I I

20 21
22 23 24 25 26 27 28 29

10

Standby muting output to power amp Device ground (LC75854 (LC75854 key matrix is used simultaneously) key matrix is used simultaneously) input For key matrix (2) For key matrix (1)

GND 3

10

I

Rotary commander AF IN FM S-M AM S-M AM IF FM IF VDD FM LOC OSC AM LOC OSC GND EO 2 EO 1 TEST IF REQ CON LOC/DX OUT II II II I I � I I �

I
I I

AF level input during AF operation FM S-meter signal input AM S-meter signal input AM IF count signal input FM IF count signal input Device power supply FM local oscillation AM local oscillation Device ground Charge pump output for low-pass filter Charge pump output for low-pass filter Device test input (need to be pulled down) IF count signal request output LOC/DX switching output during radio tuning input input

30 31
32 33 34 35 36 37 38 39

I

I
I

0 0
�

I

o o o

BEEP OUT

Beep sound output (200Hz, 3kHz, 50ms) The input is accepted only when the display input is received (MONO=H, ST=L). In

I

40

ST IND MOIST

OUT

I/o

other modes, the ST indication MONO key is pressed.

is switched off. Forced monaural output when the

18