AIWA CTX421
Service Manual

IC DESCRIPTION - 1/1 (TC9323F-027) - 1/2
Pin No. 1~4 5 6 7 8 9 10 11 12 13 14 15 16 Pin Name N.C
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I/O � O � O O O O O O O O O O Not connected. MS signal output Not connected. Standby muting output Muting output to power amp Loudness output

Description

APS N.C S-MUTE
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P-MUTE LOUD LOCAL MONO 20dB MUTE AGC CUT/IF REQ RADIO TAPE CD

Local/DX switching output. LOCAL: "H", DX: "L" MONO/STEREO switching output. MONO: "H", STEREO: "L" -20dB muting output. This function is enabled when the -20dB muting jumper is selected. Outputs "H" during searching of frequency. This is an IF count control signal or used to shut off the AGC circuit. RADIO output TAPE output CD output Band switching outputs

17

BAND 1

O FM MW

BAND1 H L L H

BAND2 L L H H

18

BAND 2

O

LW FM (L) Not connected

19 ~ 21 22 23 24 ~ 33 34 ~ 37 38 ~ 45 46 47 48 49 50 51 52 53 54 55 56

N.C RE1 RE2 N.C K0 ~ K3 T0 ~ T7 TAPE CD PANEL POWER PHONE MUTE LEVEL METER DIR FF/REW E-VOL DATA E-VOL CK E-VOL CE

� I I � I O I I I O I O I I

Rotary encoder input 1 Rotary encoder input 2 Not connected Key matrix inputs Diode matrix outputs TAPE input CD input. "H" CD input enables the CD key. Detects detachable panel (0.2-0.5 s chattering time is provided). Panel provided: "H", Panel not provided: "L" Power output The telephone signal automatically applies muting. The signal level is converted to a digital signal. This meter signal moves the LCD level bar according to the level. TAPE running direction indicator input TAPE FF/REW indicator input

O

Pins to control the LC75374E electronic VR.

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