Ok, I solder out.
1040 hFE with a multimeter. I think it is ok.
You can check the transformer in any circuit or generator
if there is a low output impedance.
U5-?
If the transformers are identical, change between them.
Checking
I ordered U5 to U10 new ICs. I don't have the place to check the U5 when the card is inserted.
Checking
I ordered U5 to U10 new ICs. I don't have the place to check the U5 when the card is inserted.
U5 replacement with a new one. So faster.
Just install it on the panel.
The transformer must be removed and connected to the generator.
Emulate the signal is real!
The secondary winding of the load and see the amplitude level and waveform.
If it's bad you'll notice.
I installed the Sockets!
Here is a weak spot. Therefore it can happen again.
3g57
Hi,
Quick I soldered out the A3T1.
Source: 1Vrms 1kHz sin wave
Here are the results:
N2
N3
It looks good?
not happy.
what signal at the transformer input?
Try the second one. for comparison.
Do not confuse the transformers.
Source: 1Vrms 1kHz sin wave
I try the second now.
Here is the A3 T2.
Source same: 1Vrms 1 kHz sin wave
N2
N3
Both transformers output similar. Both good or both bad?
You can assume that he is normal.
Two could not burn.
In this way, check the output transformers. Only necessary
load them.
Good news that they are good. Do you think as output transformer A3 T3, T4, T5?
Good news that they are good. Do you think as output transformer A3 T3, T4, T5?
It is necessary to check at least this way.
With a good generator and Extender boards, everything was much easier. Disconnect the input. At the input of the cascades, give the necessary signal and follow the path of the oscillograph with the oscillograph. Watch where he is lost.
p.s. Krisz! soon morning. I'm going to go to bed.
Send me screenshots!
Now I know what the extender board is good for.
I have a Philips signal, it can everything.
Disconnect the signal, do you mean A3 J1?
Disconnect the signal, do you mean A3 J1?
Transformer input T1.
Do not rush. Till tomorrow!
Ok, tomorrow continue. Good night! :-)
Hi,
I checked the BNC sockets, on the front side.It is missed from your the checklist what you wrote. All wires tested for shorts to chassis. No shorts between the pairs too.
Lc - Blue wire - OK
Lp - Red wire - OK
Hc - Yellow - OK
Hp - White - OK
Krisz
Krisz! Hi!
You have another option.
Take out the module and on the table give him the necessary + 12V / -12V.
On T1, give the necessary signal. Next, with an oscillograph, look at it.
Hi,
I found an interesting article about, how to test the pulse transformers.
https://scienceprog.com/testing-pulse-transformer-with-an-oscilloscope/I checked both transformers secondary n2, n3 and all right. You see in the scope pic.
The Bias Controller arrived.
I bought U5 - U 10 ICs. I replace them, it is maybe slowly because I hate desoldering ICs from PCB.
Signal levels are performed by U5.
This is the table.
Gives commands from the DSA- TRD DECODER.
You have a weak signal level.
Here's your task.
When you set the potentiometer signal to the maximum you do not have an error. Do I understand correctly?
It was on the video.
If you have cascaded amplifiers in good order, then you need to search for the reason with the teams!
Hi,
Today I bought U5 IC it is called LM339N and sockets. It is a good replacement? I replace first time the U5 now. I don't have any space for the measure when the card is inserted
May I solder on the pins of the IC little wires, but it is very homemade version... what do you think?
I tested the Bias controller, looks like it is working!
May I solder on the pins of the IC little wires, but it is very homemade version... what do you think?
I did not understand the question.
What to solder?
If I insert the card, I don't have any space for measuring. But if I solder short wires on the U5 339IC pins, I can measure the correct DC levels? I know it is very amateur, but I don't have extension cards yet.
The LM339N good for U5?
You first plug in and turn it on. Will there be an error?
To solder to it is not a good option!
If you are sure that there are no problems with amplifiers and after the replacement of U5
there is an error then there is no command on U5.
The signal with U5 can be checked in the key bases Q ...... Q
They are installed at the top and they can be reached.
I am replaced the U5 but nothing changed. ERR 4 still flashing. Do you think Q2 to Q5?
Krisz
Maybe. It is necessary to change.
It is desirable to measure the levels c U5.
U5 adjusts the signal level at the output U2.
R14 at the output U1.
How do I remember the output of U1 was close to normal?
Ok, I try to measure the transistors.
What level need there?
I not measured yet the U1 output voltages.