usp440m-42lp psu

[joehezzer]

Re: usp440m-42lp psu

still waiting for filter

[paulstef]

Re: usp440m-42lp psu

still waiting for filter

Well if that's all there was you are very lucky.

[joehezzer]

Re: usp440m-42lp psu

Well if that's all there was you are very lucky.

fingers crossed there is no other damage. the chap said he had a sparky round his house the week b4 sorting his house electrics out, then a week later he had a power cut because of the weather and the set never turned back on, fingers crossed there is no other damage

[joehezzer]

Re: usp440m-42lp psu

ok so i have changed filter no joy, i must have tested something wrong somewhere or has blown old filter and something else. i have not had chance to test it properly yet. i did test the rocker switch and it tested ok but on closer inspection it looks a bit melted.
when i plug the power cord in i can hear what sounds like a relay click from the area pictured and shorting sound if i can use that term

[joehezzer]

Re: usp440m-42lp psu

Right ok test out put again and got 263v Ac atleast I have a reading this time lol

[joehezzer]

Re: usp440m-42lp psu

Perfect. What's the voltage at the points indicated in the picture?

37v AC

[joehezzer]

Re: usp440m-42lp psu

37v AC from these

[paulstef]

Re: usp440m-42lp psu

37VAC is not enough, must be the same voltage as input AC voltage.

[joehezzer]

Re: usp440m-42lp psu

[joehezzer]

Re: usp440m-42lp psu

37VAC is not enough, must be the same voltage as input AC voltage.

ok just double checked it got the same voltage as the input, 263v ac

[paulstef]

Re: usp440m-42lp psu

Go right to the connector where it says 5VSB (CN801). Measuring DC you should have 5V.

Then connect a 1k resistor from 5VSB to RL_ON. The relay should come on and you should get 9V, 24V and 12V.

Then connect a 1k resistor from 5VSB to VS_ON. You should get about 190V VS and 60V VA. All DC.

[joehezzer]

Re: usp440m-42lp psu

Go right to the connector where it says 5VSB (CN801). Measuring DC you should have 5V.

Then connect a 1k resistor from 5VSB to RL_ON. The relay should come on and you should get 9V, 24V and 12V.

Then connect a 1k resistor from 5VSB to VS_ON. You should get about 190V VS and 60V VA. All DC.

Just gonna have me dinner

[joehezzer]

Re: usp440m-42lp psu

Ok not getting any voltage at all

[paulstef]

Re: usp440m-42lp psu

check the measurements in the picture

the yellow part creates the 5V standby voltages

[joehezzer]

Re: usp440m-42lp psu

Nothing from any.

[joehezzer]

Re: usp440m-42lp psu

Nothing from any of them. So probably need to pull off diodes and check em !!

[paulstef]

Re: usp440m-42lp psu

Nothing from any of them. So probably need to pull off diodes and check em !!

No.

Obviously the NCP1200 (8-PIN IC) is not oscillating.

From cathode of D103 to heatsink, do you read high voltage DC?
If not what do you read from the leftmost pin to the rightmost pin of the bridge rectifier BD101?

[paulstef]

Re: usp440m-42lp psu

BTW, leave everuything disconnected from the board apart from AC IN of course.

[joehezzer]

Re: usp440m-42lp psu

Voltage from cathode nothing .looking at the bridge rectifier from above the bottom pin 00.4 volts and the upper pin 00.5v dc

[paulstef]

Re: usp440m-42lp psu

I don't understand.

1st measurement: Put your multimeter probes on the 2 middle pins of BD101. Measure AC. What's the voltage?

2nd measurement: Put your multimeter on the two outer pins of BD101. Measure DC. What's the voltage?