Labels:book | reckoner | sky OCR: KENWOOD SB-973 SERVICE BULLETIN AMATEUR RADIO SUBJECT DATE TS-440S PLL UNLOCK DUE TO vcos 08 08/90 The vCo and act ive low pass filter are sealed in synthetic rubber mechan cally stabi ize them dur ing mobile operat on Over peri iod of several years the rubbe insul at on prope rt es can reak down This be caused by peated tempera ture var ions Th is can cause the vCo to vary in frequency whs ich will force the Loop to unl ock or cause the audio to warble This modification will correct event unl Lock caused by vCO REOUIRED PARTS 2SC2459 BL) TRANSISTOR QTY 1SV153 VARA CTOR DIODE QTY Disconnect the supply and antenna Remove the top and bottom covers Do not damage the speaker wires when remov ing the top cover Remove the OMD screws from the rear of the IF unit and raise the unit to the PLI boar ...
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