Line 6 Toneport UX2 (POD Studio UX2) schematic needed

[Rock 'n' Roller]

Hello!

Does anybody have schematic or service manual for Line 6 Toneport UX2 (POD Studio UX2)?
I try repair mine after sudden power surge. Unit was plugged in tube amp's loop and thru usb to computer. The smoke came out and now it doesn't work.

I replaced some broken transistors and LDO and now i have +3.3V, +5V, and + 48V worked. But without schematic i can't figure out how repair +7V, -7V, and -5V.

Thanks!

[doctor]

Hello!

Does anybody have schematic or service manual for Line 6 Toneport UX2 (POD Studio UX2)?
I try repair mine after sudden power surge. Unit was plugged in tube amp's loop and thru usb to computer. The smoke came out and now it doesn't work.

I replaced some broken transistors and LDO and now i have +3.3V, +5V, and + 48V worked. But without schematic i can't figure out how repair +7V, -7V, and -5V.

Thanks!

Here is the power supply schematic.

[Rock 'n' Roller]

Thank you doctor!

Now it’s clear! I replaced Q15 and that’s it! Power supply is worked! Indicator’s lights are on. But computer still doesn’t see device.

Here is the schematic with voltage reading.

[Rock 'n' Roller]

Something wrong with SUSPEND point. It should be in low but it is in high (2.66V). Only when I pull it to GND I have +3.3VSW and +48V_Phantom. And U2 is very hot. And instead of +5V on TP_+5VLIM I have +3.8V.

I think the cause is lay on +3.3D trace.

Dear doctor have you another parts of schematic?
Please!

[Rock 'n' Roller]

It looks like TAS 1020 USB controller doesn't work properly. But I'm not sure yet.
Is it possible that analog ground totally isolated from digital ground?
I’m measure impedance between DVss and AVss pins of TAS1020 - it is tends to infinity.

Here is typical TAS1020 device connections from datasheet.

[doctor]

Firstly, see your private message box.

Secondly, analog and digital grounds must be connected together in the single point close to a supply unit. The best professional solution is the resistor of 0 Ohm. In this case this is the R43=27 Ohm.
I think that it is open.

[Rock 'n' Roller]

Thank you for reply doctor!
I have looked in my private message box and there is no message.
Maybe you resend it one more time.
Sorry for my bad English. It’s not my native language.

[Rock 'n' Roller]

Yes! The R43 is open. And strange - there is no visual damages on it or bad soldering.

[doctor]

If a current flowing through resistor slightly exceeds its maximum allowable value, resistor heats, its color is changed (to brown or even to black) and, finally, it is damaged. If this current exceeds maximum allowable value is tens times, it destroys resistor very quickly (during msecs) without visible signs. (Sometimes anode resistor similarly damaged in tube amplifiers).

What is the status of the UX2 after replacement of the R43?

[Rock 'n' Roller]

Thanks!
I didn’t know it. I was thinking completely contrary!

I replaced R43. I don’t have 27 Ohm SMD therefore I placed 0.125 Wt 22 Ohm resistor .
The voltage on power supply’s TPs is slightly changes. Now I have 5.03V on +5VLIM (was 3.8V). I think the power supply now is completely working.

But the computer still doesn’t see UX2. When I plug it in the indicators lights are on then quickly off. Only when I pull SUSPEND TP to GND the indicators lights stay on but nothing changes. And U2 LDO is hot, and voltage is 3.2V instead of 3.3V. When I cut the +3.3D trace near the LDO voltage is rising to 3.3V and LDO stay cold.

I think something has excessive power load on +3.3D trace.

Here is the new power supply voltage reading with replaced components.

[doctor]

Supply voltages after replacements are OK.

1. Check good condition of R7=22 Ohm, R8=22 Ohm and R1=1.5K.
2. Check signals at the TAS1020 USB controller:
- Level “high” at pin 41;
- Level “low” at pin 19 (when guitar plug is connected);
- Oscillation at least at one of X1 pins.

If this is ok, but device is out of order, replace TAS1020.

I want to add that this replacement may be not sufficient.

[Rock 'n' Roller]

Thank you for reply.

1. I have checked R7,R8, R1 – they are ok.
2. At pin 19 level “low” when guitar plug is connected and level “high” when guitar plug is off (only if I plug in the guitar input not in the line inputs).
3. At pin 41 level is “low” (maybe it’s not absolute “low” because voltage is +0.2V).
4. I’m not quite sure about X1 pins.
Did you mean 47 pin (I have found schematics of POD XT and Duoverb. On these schematics is XTALI marked pin)? At this pin (47) is high frequency oscillation.

Here are the schematics of POD XT’s USB interface and Duoverb’s USB interface.

[doctor]

Send me your private email.

[Amirul]

Please send me schematic for line6 kb37 sir.
amiroliez@gmail.com

[Amirul]

Thank you for reply.

1. I have checked R7,R8, R1 – they are ok.
2. At pin 19 level “low” when guitar plug is connected and level “high” when guitar plug is off (only if I plug in the guitar input not in the line inputs).
3. At pin 41 level is “low” (maybe it’s not absolute “low” because voltage is +0.2V).
4. I’m not quite sure about X1 pins.
Did you mean 47 pin (I have found schematics of POD XT and Duoverb. On these schematics is XTALI marked pin)? At this pin (47) is high frequency oscillation.

Here are the schematics of POD XT’s USB interface and Duoverb’s USB interface.

[ATTACH=CONFIG]26255[/ATTACH]

[ATTACH=CONFIG]26256[/ATTACH]

Do you have schematic line6 kb37 ?