Hi,
Newbie to the sight with limited experience. My T1500-bd quit working. After opening up amp I notice one of the 75344G MOSFETS burned up (Q1003) along with the 47.5 Ohm resitor (R1009). Removed parts and want to order new but am not quite sure what resistor to buy to replace. My research indicated it was a 0805/2012 after measuring it but when I look at the options available I don't know what tolerance it is. Help?
Reading many of the T1500-bd threads has taught me alot about repairing this amp. I assume it would be wise to replace Q1004 & Q1001 since there are next to the bad Q1003 MOSFET?
Additionally, I had a hard time melting the solder for Q1003 to remove with my Weller Ungar 921ZX solder iron. I eventually cut it out and removed as much solder as possible before it would heat up enough. Never had this before repairing other elctronics. I assume its due to the copper thickness in the layers of the PCB. Any suggestion on install would be appreciated.
Once I have the new items installed I can report back and hopefully continue on to solve problem with help.
Thanks,
Greg
Newbie to the sight with limited experience. My T1500-bd quit working. After opening up amp I notice one of the 75344G MOSFETS burned up (Q1003) along with the 47.5 Ohm resitor (R1009). Removed parts and want to order new but am not quite sure what resistor to buy to replace. My research indicated it was a 0805/2012 after measuring it but when I look at the options available I don't know what tolerance it is. Help?
Reading many of the T1500-bd threads has taught me alot about repairing this amp. I assume it would be wise to replace Q1004 & Q1001 since there are next to the bad Q1003 MOSFET?
Additionally, I had a hard time melting the solder for Q1003 to remove with my Weller Ungar 921ZX solder iron. I eventually cut it out and removed as much solder as possible before it would heat up enough. Never had this before repairing other elctronics. I assume its due to the copper thickness in the layers of the PCB. Any suggestion on install would be appreciated.
Once I have the new items installed I can report back and hopefully continue on to solve problem with help.
Thanks,
Greg
Attachments
The resistors are 1% tolerance. 47 would be 5%. The extra significant digit means that it's a tighter tolerance.
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Please (and this applies to anyone who needs repair help) use your sig line to list all equipment you have, editing it as equipment changes. Include the model numbers.
Top of page, menu USER CP >> EDIT SIGNATURE
Oscilloscope (yes or no)
Multimeter(s)
Type of signal source (grounded RCA shields preferred).
Soldering iron
Desoldering pump
Power supply
2 ohm current limiting resistor (hollow cylindrical ceramic 100w preferred)
To upload photos click the following:
Go Advanced
Manage Attachments
Browse
Upload
Repeat as necessary
Preview post to see how the post will look.
Click Submit Reply to send it to the forum.
Please (and this applies to anyone who needs repair help) use your sig line to list all equipment you have, editing it as equipment changes. Include the model numbers.
Top of page, menu USER CP >> EDIT SIGNATURE
Oscilloscope (yes or no)
Multimeter(s)
Type of signal source (grounded RCA shields preferred).
Soldering iron
Desoldering pump
Power supply
2 ohm current limiting resistor (hollow cylindrical ceramic 100w preferred)
Perry,
Seems I don't have the ability to have a signature to edit. Here is a list of equipment I have:
Oscilloscope: No
Multimeter: Fluke 77
Type of signal source: Alpine CDA 9856/Home CD/Nak.Cassette/iPhone with signal gen app, grounded RCA shields preferred🙁Many).
Soldering iron: Welller Ungar 921ZX
Desoldering pump: No
Power supply: No
2 ohm current limiting resistor: No
Seems I don't have the ability to have a signature to edit. Here is a list of equipment I have:
Oscilloscope: No
Multimeter: Fluke 77
Type of signal source: Alpine CDA 9856/Home CD/Nak.Cassette/iPhone with signal gen app, grounded RCA shields preferred🙁Many).
Soldering iron: Welller Ungar 921ZX
Desoldering pump: No
Power supply: No
2 ohm current limiting resistor: No
Try again after you're out of moderation (7 posts?).
You should look into the following desoldering pump, purchased directly from the manufacturer to avoid buying a counterfeit.
The Original Deluxe SOLDAPULLT: EDSYN Inc.
You should look into the following desoldering pump, purchased directly from the manufacturer to avoid buying a counterfeit.
The Original Deluxe SOLDAPULLT: EDSYN Inc.
Ok sounds good.
These are the MOSFETS and resistor I ordered.
3 pcs: HUF75344G3 (MOSFET N-CH 55V 75A TO-247)
10 pcs: RC0805FR-0747R5L (RES SMD 47.5 OHM 1% 1/8W 0805)
These are the MOSFETS and resistor I ordered.
3 pcs: HUF75344G3 (MOSFET N-CH 55V 75A TO-247)
10 pcs: RC0805FR-0747R5L (RES SMD 47.5 OHM 1% 1/8W 0805)
Perry,
I installed the components I purchased and the amplifier came back to life and is working as designed. Thanks to all for this site, its a great place to pick up clues on how to repair. Thank you Perry for your input specifically.
I installed the components I purchased and the amplifier came back to life and is working as designed. Thanks to all for this site, its a great place to pick up clues on how to repair. Thank you Perry for your input specifically.