Hey all,
I'm trying to repair a turntable (Numark TTX) that I can't find a service manual for. I'm a bit of an electronics newbie, so don't judge me harshly if these are stupid questions!
One of the obvious things wrong with it is a burned-out resistor - I think one of the power transistors for the motor has shorted and the resistor bore most of the damage. I'm having a hard time figuring out what value it is - possibly the heat from the short has burned off some of the markings, but see what you think. I'm thinking maybe 9Ω (black-white-black). Looking at the PCB, it seems to be going from the emitters of the transistors to ground.
(sorry for the awful pics)
Also, I need to replace the power transistors. The current ones are ROHM 2SD1889 & 2SB1340, which are discontinued. I was thinking replacing them with NTE2343 & NTE2344, which are (apparantly) basically identical. Sound reasonable?
Datasheets :
ROHM - http://www.datasheetcatalog.org/datasheets/50/240459_DS.pdf
NTE - http://www.datasheetcatalog.org/datasheet/nte/NTE2343.pdf
I'm trying to repair a turntable (Numark TTX) that I can't find a service manual for. I'm a bit of an electronics newbie, so don't judge me harshly if these are stupid questions!
One of the obvious things wrong with it is a burned-out resistor - I think one of the power transistors for the motor has shorted and the resistor bore most of the damage. I'm having a hard time figuring out what value it is - possibly the heat from the short has burned off some of the markings, but see what you think. I'm thinking maybe 9Ω (black-white-black). Looking at the PCB, it seems to be going from the emitters of the transistors to ground.
(sorry for the awful pics)
Also, I need to replace the power transistors. The current ones are ROHM 2SD1889 & 2SB1340, which are discontinued. I was thinking replacing them with NTE2343 & NTE2344, which are (apparantly) basically identical. Sound reasonable?
Datasheets :
ROHM - http://www.datasheetcatalog.org/datasheets/50/240459_DS.pdf
NTE - http://www.datasheetcatalog.org/datasheet/nte/NTE2343.pdf
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