Sanyo PLC-SU40 Service Manual

Also see for PLC-SU25: Owner's manual Specifications

-45-Lens Motor ProblemsTroubleshootingNo SoundLogic Table of IC5501/IC5551Input Output Operation4 5 7 1H L L H Forward driveL H H L Reverse driveH H L L BrakingL L - - Stand byCheck PC/AV-audio switching circuit.Check IC001, audio-sw IC, and peripheral circuit. PC/AV_SW5(PC:L) signal is applied on pin 10 of IC001 through Q041.MUTE5 signal (Mute:H) is applied on pin 9 of IC001 output frompin 12 of IC1803 through IC1351, buffer IC.Is the audio signalobserved on the AUDIO-OUT terminal?Check Audio amp.and control circuit.Check IC5001, audio-amp IC, and peripheral circuit. MUTE5signal (Mute:L) is applied on pin 1 of IC5001, output from pin 12of IC1803 through IC1351, buffer IC. VOL_CTL signal is applied on pin4 for volume control, sent from pin 19 of IC3561.Is the audio signalobserved on pin 6 ofIC5001?Check audio output circuit.Check speaker, connection of the terminals “K10T”, “K8F”.YesNoYesNoCheck the power supply (7VMCI) circuit, IC5501 and IC5551 andperipheral circuit. Check Key SW board.Both of ZOOM andFOCUS motors are notfunctioning.NoYesCheck the ZOOM motor control circuit.Zoom motor is controlled by signal ZOOM +, - output from pins1 and 7 of IC5501. These control signals are driven by IC301,system control IC, and applied to pins 4 and 5 of IC5501 throughthe IC1804, I/O-sw IC.Only ZOOM motor is notfunctioning.NoYesCheck the FOCUS motor control circuit.Focus motor is controlled by signal FOCUS +, - output from pins1 and 7 of IC5551. These control signals are driven by IC301,system control IC, and applied to pins 4 and 5 of IC5551 throughthe IC7801, D/A IC.Only FOCUS motor isnot functioning.NoYesCheck logic table of motordrive ICs, IC5501, IC5551.Check following steps.Check following steps.