Total posts : 45366
more than likely its a snubber, the diodes are on a power supply board so that wont be the part, the + and – apear to be more of a tolorance deal than indicating polarity. I see I can post attachments here including Jpegs, I have the player all put together now. I almost wore out the screws taking it apart and putting together last few times, but next time and there will be a next time, ill take a picture of it. Its about a bit smaller than a postage stamp squar and about 1/4 thick or so. My guess is snubber too, but it threw me that it conducted a bit but bet it has a small internal short like Neil says. I didnt ohm it out but when I cut one lead the problem was gone when the switch is off no power comes through. I did test the switch and no leakage there. As I said I cant hear any pops or anything when powering up or changing tracks, so I dont think any harm done having it disconnected for now. The device isnt actually soldered across the micro switch that switches AC on but is across the switch if you trace the wires back to the transformer, there is a solder lug there and thats where it is.
I have ohter players from the era I can check those too see if anything like that is on them. The player is a home player but uses a DC motor.
Thanks for all the input.
A side note, if you remember some time ago i had a post that I had tree FM transmitters using the BH 1417 chip ( 1415?) i get them mixed up, ok well this transmitter is full 88-108 so what ever that chip is.. well the three transmitters all had the same problem, wont transmit stereo.
I did trace out all wrireing on the boards, no mixing of the audio befor the inputs on the chip, I ended up changing the chip twice with two different sources for the chip and still no luck, they transmit the piolot 19 khz which lights up the indicator light but audio is in mono.
I pretty much gave us and worked with the guy in CHINA who sold them to me and he agreed to take a look at them.
I sent them back last week, so I suppose after the first of the year if they get there ill hear someting, hopfully STEREO ha ha
That one is a real puzzler… I suspect some compontent on the board isnt correct , I checked all the resistors but SMD caps for the most part arnt marked… I had coffe to drink here and transmtters readings to take no time to try to swap SMD parts …
Ill let you know what the guy in china finds.
I have one other thing and should move this to proper post site, but on the TH transmitters, it seems if you really jam in the audio voltage, I can get the field strenght signal to really bounce positive, but have to drive the singal hard to do that… If im correct with all operating properly, signal strenght should be 50 % higher under modulaton peaks than dead carrier so i havnt checked with a scope to see if im over modulating,but audio on the car radio is much louder and nice and clear so I dont think I am.. Just wondering what the ohters have to say about this.