Olympus XA Repair Manual

Also see for XA: Instructions Repair manual

CIRCUITRYThecircuitryiscomposedof theholdcircuit,modeselectorcircuit,batterycheckcircuit,delaycircuit,integralcircuit,comparator,oscillationcircuitandmetercircuit.Hold circuitThe hold circuit will start working by turningon SW1 if a minimum start-up voltage of 2.2+0.05 V is detected by completion of filmexposure. When the start-up voltage is lessthan 2.2 +0.05 V, the hold circuit does notfunction, Electric current, therefore, willnot flow into MG1 even if SW1 is turned onand the diaphragm blades will not open.(Holdcircuit)(Modeselectorcircuit)(Batterycheckcircuit)2. Mode selector citcuitThe mode selector circuit is designed to select4 different modes, viz, self-timing, batterycheck, automatic shutter speed and +1.5 EVcorrection.Self-timing modeWithSW3beingturnedto©) @isconnectedto©(plus)and withSW1being turnedon,thedelaycircuit startsfunctioning(time-setting circuitofR105and C107).Inса.12seconds,MG1isturned onto activate thediaphragmblades.Theoscillation circuitfunctions duringthisshortperiod ofca.12secondstoemita2.4KHzbeepattheintervalsof2 Hz synchronouslywith the blinking ofLED.Plus line99 =;OX Ф;99іне? |АЗRelease of self-timing mechanismWithSW3beingswitchedto(С),(S)isconnect-edtoC(@®isconnectedto+)andtheself-timingmechanismisreleased.Althoughthereleasepositionisnotindicated on thecamerabody,the releaseswitchisturned on whileSW3isbeing switchedtoCHECK,therebycausingthe self-timingmechanismtobereleas-ed.((4).isconnectedtoCwhile theformerremainsconnectedwithG2)