Canon LV-7545U Service Manual
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Contents
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1.4 Lens Motor Error1) No drive signal to the motorCheck that the drive signal is observed at pins 1 and 2 of K16M (for focus motor) of thepower supply unit, pins 3 and 4 of K16M (for the zoom motor) and 1 and 2 pins ofK16L (for the lens shift motor).Check that the drive signal is observed at pins 2 and 10 of IC1611, IC1602 andIC1601 of the drive IC IC1611, IC1602, and IC1601.Check IC1611, IC1602, IC1601 and peripheral circuits. Check the motor powersupply (9VA).2) No drive signal to the motor drive ICCheck that the drive signals are observed at pins 5 and 6 of the drive IC IC1611,IC1602 and IC1601. The signals are supplied from pins 4 and 5 (focus), pins 6 and7(zoom) and pins 9 and 10 (lens shift) of D/A control IC, IC1641.3) No drive signal output from the CPUThe motor drive signal is supplied from the main CPU IC801 through the IC bus.4) No key switch signal applied to the CPUA control signal (voltage) is supplied to pins 118 to 120 of IC801 when a control keyswitch is pressed.Part 4: Troubleshooting4-8IC1611/IC1602/IC1601 truth tableInput Output Operation5 6 10 2H L L H Forward rotationL H H L Reverse rotationH H L L StopL L - - Standby102 3029791065 118119120623IC1602ZOOMMOTOR DRIVE IC801MAIN CPU102561334IC1601LENS SHIFTMOTOR DRIVECONNECTBOARDMMZOOMMOTORLENS SHIFTMOTOR K16L54K8TK16RK9AK9BK9CK8JK8SK68ACONTROL BOARDMAIN BOARDDRIVE BOARDFOCUS +FOCUS -LENS +LENS -ZOOM + SCLSDAZOOM -TOP_DET. CENTER_DET.9 8 79 8 7FOCUSZOOMLEVEL +LEVEL -102 545612IC1611FOCUSMOTOR DRIVEIC1641D/AMOTOR CONTROLMFOCUSMOTOR K16M1 3IC1801I/OEXPANDER13 14Fig. 4-4 |
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