DENONHi-Fi Stereo Pre-main AmplifierSERVICE MANUALMODEL PMA-250STEREO PRE-MAIN AMPLIFIERTABLE OF CONTENTSSPECIFICATIONSBLOCK DIAGRAMCONTROLS AND DESCRIPTIONSC0 NNECTIONS……………22334METHOD OF ADJUSTMENTS .....................................:...................REMOVAL EACH SECTION…6SEMICONDUCTORS.....................6PRINTED WIRING BOARD PATTERNS AND PARTS LISTETC0862 POWER CONTROL UNIT (for E2)....................................6,10ETC0859 POWER CONTROL UNIT (for EK)...................................7,10ETC0864 POWER&CONTROL UNIT (for E1/EA).................................8,11ETC0865 POWER CONTROL UNIT (for EU/EC).................................9,11WIRING DIAGRAM…12SCHEMATIC DIAGRAM.·....·EXPLODED VIEW OF CHASSIS AND CABINET PARTS LIST14NIPPON COLUMBIA CO.,LTD.
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