Re: Marantz Model 120 Tuner Craziness I am Stumped!
Ok Here are some of the results... Not necessarily in order.
Could not find 19Khz at H302 or 38Kkz at H304 so the MPX is not enabled.
The FM stereo lamp is not lit. and at J307 there is 12.75 Volts?? And at Collector H305 same voltage .
At H559 Collector is a steady .024 Volts while tuning on or off station.
J307 has 12.75 Volts on the collector while tunning
J305 is .037 Volts all the time.
H306 collector .852 Volts
H307 Base is .639 Volts
Something is open some where...I'll finish ringing out the other transistors on the MPX board with my B&K transistor In Circuit/out of Circuit tester. All the other components on that board seem good.
So get another cup of coffee ...maybe with a few drops of JD. Let me know when you want to say Uncle.....L.O.L.
Ok Here are some of the results... Not necessarily in order.
Could not find 19Khz at H302 or 38Kkz at H304 so the MPX is not enabled.
The FM stereo lamp is not lit. and at J307 there is 12.75 Volts?? And at Collector H305 same voltage .
At H559 Collector is a steady .024 Volts while tuning on or off station.
J307 has 12.75 Volts on the collector while tunning
J305 is .037 Volts all the time.
H306 collector .852 Volts
H307 Base is .639 Volts
Something is open some where...I'll finish ringing out the other transistors on the MPX board with my B&K transistor In Circuit/out of Circuit tester. All the other components on that board seem good.
So get another cup of coffee ...maybe with a few drops of JD. Let me know when you want to say Uncle.....L.O.L.
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