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XPR8300/8400 PA Replacement
- Thread starter dcr_inc
- Start date
- Status
Xpr-8300 Basic Service Manual
For those who think it's easier to annoy you than to Google 'Xpr-8300 basic service manual' themselves.
First time I have heard of one of these devices fail.
to replace though, it means removal of the board. you will need an SMT thermal solder station with maybe 4 or5 MM nozzle.
Set temperature to 425°.
Apply heat to the device while gently lifting the device with LONG tweezers (thermally insulated is better)
The solder will melt and lift the device off the board. you can clean off excess solder with a conventional pencil and wick.
Don't work to heavy on the PC board etching so as not to damage it. Be careful not to dislocate nearby components.
You will need also, a syringe of solder paste.
Place the new device in the proper position with the contacts aligned with the etching.
Run a bead of solder paste along the contacts, both sides.
With the heat gun, apply heat to the beads until the solder melts and flows under and onto the contacts.
Try to avoid hairs that cause shorts.
If you have not done SMT rework before, I suggest you go on youtube and review the many SMT rework videos until you think you are ready for this.
Now before you go to all this work, confirm the device has failed with the proper troubeshooting procedures in service manuals.
Just no RF power output does not mean the final PA has failed. these fets can take 50 volts on the drain, Open or shorted antenna output at full power. Now if the device has a crater on top, its obvious.
Re mounting the board, Use a generous coating of Z1 thermal compound. tigten screws very snug but don't strip the threads.
Cheers
750W Soldering Iron Station , 2 IN 1 Digital Hot Air Rework Station with 212°F- 896°F Temperature Control, LED display, Desoldering Pump , 4 Tweezers - - Amazon.com
Solder Paste SMT BGA Solder Paste Syringe XG-Z40 Solder Paste 10CC 63SN/37PB | eBay
249G Aavid, Thermal Division of Boyd Corporation | Fans, Thermal Management | DigiKey
to replace though, it means removal of the board. you will need an SMT thermal solder station with maybe 4 or5 MM nozzle.
Set temperature to 425°.
Apply heat to the device while gently lifting the device with LONG tweezers (thermally insulated is better)
The solder will melt and lift the device off the board. you can clean off excess solder with a conventional pencil and wick.
Don't work to heavy on the PC board etching so as not to damage it. Be careful not to dislocate nearby components.
You will need also, a syringe of solder paste.
Place the new device in the proper position with the contacts aligned with the etching.
Run a bead of solder paste along the contacts, both sides.
With the heat gun, apply heat to the beads until the solder melts and flows under and onto the contacts.
Try to avoid hairs that cause shorts.
If you have not done SMT rework before, I suggest you go on youtube and review the many SMT rework videos until you think you are ready for this.
Now before you go to all this work, confirm the device has failed with the proper troubeshooting procedures in service manuals.
Just no RF power output does not mean the final PA has failed. these fets can take 50 volts on the drain, Open or shorted antenna output at full power. Now if the device has a crater on top, its obvious.
Re mounting the board, Use a generous coating of Z1 thermal compound. tigten screws very snug but don't strip the threads.
Cheers
750W Soldering Iron Station , 2 IN 1 Digital Hot Air Rework Station with 212°F- 896°F Temperature Control, LED display, Desoldering Pump , 4 Tweezers - - Amazon.com
Solder Paste SMT BGA Solder Paste Syringe XG-Z40 Solder Paste 10CC 63SN/37PB | eBay
249G Aavid, Thermal Division of Boyd Corporation | Fans, Thermal Management | DigiKey
Cool, That is often what I have seen.
Don't really know.. Removed the repeater from the site with NO output power what so ever, placed it on the bench at the shop and Vola!! full power.. Dam thing has been working 100% since then.. Yes, I did try power cycling and even reprogrammed it at the site before removal.. Thats why its FM (Freakin Magic)
- Status
