HP-Service-Note-1781B-1 电路图.pdf

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1、F MODEL 1781B DELAY GENERATOR Serials below 415-01026 1781 B-1 INCREASED MIXED SWEEP STABILITY If jitter exceeds specification in the above instruments when operating in the MIXED Sweep mode, make the following change. 1. Remove R49, a 20K *5% 1 watt resistor, from large circuit board and reconnect

2、it between violet wire and white-yellow wire on DELAYING SWEEP TIME SWITCH. (A new resistor may be ordered under Stock NO. 0689-2035). 2. On the Sweep Generator Schematic of your Model 1781B Operating and Service Manual, relocate R49 to the anode side of CR6 and delete FROM H. P 02028- 1 7/64- 7 RadioFans.CN 收音机爱 好者资料库