Pioneer 434CMX Service Manual - Page 110
Audio, Is IC7601 on the AV I/O Assy
UPC - 012562691107
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1 2 3 4 Audio A No sound from the speakers Yes Are the SP cables properly connected? Yes No Connect the SP cables properly then check again. Is sound muting set? No Cancel muting then check again. Yes B Is the volume set to 0? No Raise the volume then check again. Yes AUDIO AMP Assy # $ Is a signal output from IC5003 Yes on the AUDIO AMP Assy? No AUDIO AMP Assy @ Check the connection between the AUDIO AMP Assy and the SP Terminal Assy. Has the signal arrived at IC5003 on the AUDIO AMP Assy? Yes Check around IC5003. No A AV I/O Assy = Check around IC7605, IC7606, C Is a signal output from IC7603 Yes and IC7607 on the AV I/O Assy, on the AV I/O Assy? and the connection between the No AV I/O Assy and AUDIO AMP Assy. Has the signal arrived at IC7603 on the AV I/O Assy? Yes Is communication between IC7603 and the micro- No computer OK? No Yes Check the communication line. AV I/O Assy - Check around the IC7603. Is a signal output from IC7601 No Check the communication D on the AV I/O Assy? between IC7601 and IC7603. Yes Is IC7601 on the AV I/O Assy No properly controlled by the microcomputer? Yes Check the control line from the microcomputer. Check the communication between each input terminal and IC7601. No sound from AUDIO E OUT Yes Is sound muting set? No Cancel muting then check again. Yes Is the sound from the AUDIO OUT in accor- Yes Is the volume set to 0? dance with VOL control? Yes No A A F No Raise the volume then check again. 110 PDP-434CMX 1 2 3 4