Hi all
I have an XTR2500.1D that I seem to be having a head-scratching issue with.
The output drive card will have great signals all the way through to the IR2110s HIN and LIN pins when the IR2110s is NOT installed.
Once I install the 2110s I lose the square wave to HIN and pin 5 of the 393 goes to 3.6v.
The 4.7-ohm resistors are lifted from the HO and LO pins to isolate the output.
Relay does engage, rail voltage is present, 12.8v across c156 and 12.8v to VDD ref from VSS.
Diodes are good to go all resistors have been verified.
I am not familiar with this card so I am not sure if a mute circuit is active.
I have an XTR2500.1D that I seem to be having a head-scratching issue with.
The output drive card will have great signals all the way through to the IR2110s HIN and LIN pins when the IR2110s is NOT installed.
Once I install the 2110s I lose the square wave to HIN and pin 5 of the 393 goes to 3.6v.
The 4.7-ohm resistors are lifted from the HO and LO pins to isolate the output.
Relay does engage, rail voltage is present, 12.8v across c156 and 12.8v to VDD ref from VSS.
Diodes are good to go all resistors have been verified.
I am not familiar with this card so I am not sure if a mute circuit is active.
Attachments
Do you have DC on the input to the output inductor when the 2110 is in the circuit?
Does it do the same with the outputs in or out of the circuit?
Does the LIN drive signal change when you lose the HIN drive?
Does it do the same with the outputs in or out of the circuit?
Does the LIN drive signal change when you lose the HIN drive?
Sorry for the delayed reply
I have been through this card more times than I can shake a stick at trying to figure out where this fault is originating from.
I have been through this card more times than I can shake a stick at trying to figure out where this fault is originating from.
You should have a square wave on the inputs of the 2110.
Do you have the waveforms on IC172 that are shown in the attached file?
The lowest file # is pin 1.
Do you have the waveforms on IC172 that are shown in the attached file?
The lowest file # is pin 1.
Would you like the results with or without the 2110 IC installed on the board?
Like I had mentioned pin 5 will go from having the sign wave from the 072 with the 2110 IC removed to having 3.6v positive DC with the 2110 IC installed.
Thank you, Perry, I know you are always busy with this stuff and I do appreciate your input.
Like I had mentioned pin 5 will go from having the sign wave from the 072 with the 2110 IC removed to having 3.6v positive DC with the 2110 IC installed.
Thank you, Perry, I know you are always busy with this stuff and I do appreciate your input.
Did you look at the photos in the zip file?
Pin 5 of IC171 or IC172? You gave the TL072 and the LM393.
Pin 5 of IC171 or IC172? You gave the TL072 and the LM393.
Yes, I am referring to pin 5 of IC172 the LM393. Pin 5 is correct to the zip file if the 2110 is removed.
Pin 1 - correct to zip file
pin 2 - correct to zip file
pin 3 - correct to zip file
pin 4 - correct to zip file (12.8v)
pin 5 - not correct to zip file = 3.4v positive
pin 6 - correct to zip file with slight horizontal fluctuation
pin 7 - not correct to zip file = long dead time short pulses negative
pin 8 - correct to zip file (12.8v)
Pin 1 - correct to zip file
pin 2 - correct to zip file
pin 3 - correct to zip file
pin 4 - correct to zip file (12.8v)
pin 5 - not correct to zip file = 3.4v positive
pin 6 - correct to zip file with slight horizontal fluctuation
pin 7 - not correct to zip file = long dead time short pulses negative
pin 8 - correct to zip file (12.8v)
You don't have to remove the 2110. Lift the SD terminal and using a small flexible wire, connect it to the positive terminal of C156.
Do the signals look the same with the SD tied to the low-side B+?
Pin 4 negative, correct?
Do the signals look the same with the SD tied to the low-side B+?
Pin 4 negative, correct?
It would appear that everything up to pin 7 of the 393 is OK.
What are the drive signals on the input pins of the 2110?
What are the drive signals on the input pins of the 2110?
Here are the signals at the input pins of the IR2110s
Also, what is the feasibility of having the right, but wrong transistors on the board based on the datasheet from Mouser? They produce transistors with different package size has a different base, emitter configuration but has the same identifier.
For the HIN it looks to be around 12v above the negative rail and I don't have a clue what is going on with LIN. I had to move the vertical to get this into view without switching to AC coupling.
These will go away if I put the SD pin back in place.
Also, what is the feasibility of having the right, but wrong transistors on the board based on the datasheet from Mouser? They produce transistors with different package size has a different base, emitter configuration but has the same identifier.
For the HIN it looks to be around 12v above the negative rail and I don't have a clue what is going on with LIN. I had to move the vertical to get this into view without switching to AC coupling.
These will go away if I put the SD pin back in place.
Attachments
Do you have a square wave on the collector of Q171?
In my notes, I have clean square waves for the high and low in.
Do the transistors look like they are factory soldered or hand soldered?
In my notes, I have clean square waves for the high and low in.
Do the transistors look like they are factory soldered or hand soldered?
Thank you Perry
Yes there is a 12v square wave (riding negative supply) on the emitter of Q171
I did verify that the BR transistors are original so the base-emitter should be correct.
These signals are still with the SD tied to 12v
So I am looking for the reason as to why there is no square wave on the LIN pin?
If I connect the SD pin back to its pad I lose both HIN and LIN to determine if the 2110 if faulty.
Yes there is a 12v square wave (riding negative supply) on the emitter of Q171
I did verify that the BR transistors are original so the base-emitter should be correct.
These signals are still with the SD tied to 12v
So I am looking for the reason as to why there is no square wave on the LIN pin?
If I connect the SD pin back to its pad I lose both HIN and LIN to determine if the 2110 if faulty.
When you enable the 2110, you lose signal because the amp is driving everything to the extreme to try to correct for a faulty output.
You, you need to find why there is a bad LIN signal.
The drive from Q171 has to be on the collector, driving from the negative rail up to about 12v.
You, you need to find why there is a bad LIN signal.
The drive from Q171 has to be on the collector, driving from the negative rail up to about 12v.
Has the LIN become a clean square wave?
I'm not sure what to make of the waveforms above. The drive should be continuous.
I'm not sure what to make of the waveforms above. The drive should be continuous.
Thank you for the input and help Perry.
I may do some hunting around to find another drive card/amplifier to keep on hand to help troubleshoot this issue.
I get the feeling of a diode leaking or a transistor leaking as I get a good square wave on the base of Q156 which then the square wave turns into a mess, as you see above, going to the LIN pin from the emitter of Q156. I did replace Q156 with the same result so there is more happening in the circuit.
I may do some hunting around to find another drive card/amplifier to keep on hand to help troubleshoot this issue.
I get the feeling of a diode leaking or a transistor leaking as I get a good square wave on the base of Q156 which then the square wave turns into a mess, as you see above, going to the LIN pin from the emitter of Q156. I did replace Q156 with the same result so there is more happening in the circuit.