Discussion in 'Yamaha' started by Fhamre, Aug 29, 2017.
Does L1 show a dead short to one end of R501 ?
Me thinks the LED's and associated wiring is OK..
Have a good gander at C521 when you can.
If you have a means to check it. Check it.
I believe I found C521. The actual location is not the same as the manual but its the only 4.7uf 50V and its right beside and in circuit with L4.
I pulled and tested it. It was fine but replaced anyways.
Measuring from L4 to R501 I get .2ohms
L4 to chassis ground
L1 to R501
We are running out of options.
C509 needs a look'n at. D509 needs to be checked.
You are a patient man. Appreciate all your effort. Will check those suggestions in the morning. Thank you.
Well I replaced C509 and checked D509. No luck. Took out the trimmers and went back to the original resistors. No change. Took out the LEDS, put in incandescent. Replaced the fuse.
And next will recap power supply.
Starting to pout!
Still no illumination ?
No lights! Recapped the ps and a few others.
What kind of resistance do you read between L1 and chassis ground now ?
I'm having second doubts about wiring.
Are you 100% sure you have the lamps wired correctly to L1-L4 ?
Are all the incandescents serviceable ?
Thats a problem... I would think it would have around 50 Ω. Figuring 15-18Ω per lamp. Times 3 = 45 to 55 Ω.
Either one or more of the new lamps is open or the lamps are miss wired. Or you have a broken wire connection between L1 -->bulb 1 --> L2 --> bulb 2 --> L3 --> bulb 3 --> L4 --> chassis ground (E).
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