Resistor
Quadrant C8 on pdf file T15002SCH-4701-A.pdf.
Rectifiers
Quadrands C8 and H8 (approximately) on page 1 of T15002SPS-4700-B.pdf. The rectifiers with the diodes facing out will be the CTR.
Quadrant C8 on pdf file T15002SCH-4701-A.pdf.
Rectifiers
Quadrands C8 and H8 (approximately) on page 1 of T15002SPS-4700-B.pdf. The rectifiers with the diodes facing out will be the CTR.
k, i found out one of the ctr's or on mine i have now a u1620r, its going to be cr1, which makes cr3 a u1620, and the cr2 is a u1620r, and the u1620 is the cr4.
so do I need to order replacement 20r0's in size B and 37r4's in size B?
so do I need to order replacement 20r0's in size B and 37r4's in size B?
hows this to replace 20r0?
CRCW080520R0FKEA Vishay/Dale Thick Film Resistors - SMD
hows this to replace 37r4?
CRCW080537R4FKEA Vishay/Dale Thick Film Resistors - SMD
CRCW080520R0FKEA Vishay/Dale Thick Film Resistors - SMD
hows this to replace 37r4?
CRCW080537R4FKEA Vishay/Dale Thick Film Resistors - SMD
Was there one or two open source resistors? If there were two, were there any open SMD resistors connected to the other open source resistor?
Those resistors (mouser) are OK.
Those resistors (mouser) are OK.
if you mean "bad" when you say "open" there are 2 that i know of. there are 2 smd's per source resistor. the 20r0 and the 37R4.
actually there are 2 bad resitors. all test .07 ohms but 1 that test 24 ohms and yes there was the one 20r04 that was bad connected to the open source resistor also. the 37r4 are testing correctly.
The 37.4 isn't connected to the source resistor. Those are the gate resistors according to the schematic diagram. The other resistor connected to the source resistor is a 10 ohm.
okay went and checked, the only smd's i see near the source resistors are the 20r0's, 2 are testing bad, all others are testing around 4 ohms, but i think this may be due to the source resistors that are still in the circuit.
the bad smds are @ the 2 open source resistors i pulled.
by the way, what would the open smds cause when not replaced?
the bad smds are @ the 2 open source resistors i pulled.
by the way, what would the open smds cause when not replaced?
If the 37.4 wasn't replaced, it could cause catastrophic failure of the amp, especially if the protection circuit was damaged. If the 20 ohms was not replaced, the protection circuit wouldn't work properly.
Have you reinstalled the rectifiers?
Have you reinstalled the rectifiers?
well when i uninstalled the rectifiers, i cut the legs and bent them pretty badly, i can try and solder them back on.
as far as the 37.4, i thought they were testing okay(but if they weren't please let me know), and i will be replacing the 20ohm ones.
i will probably pull ALL source resistors and take readings out of circuit, and replace as necassary. then test the 20's with the source resistors out.
i am uneasy about replacing the smds as they are super small, and i am using a regular sized tip soldering iron thats a not so good soldering iron to begin with. i have read your site on the tips of desoldering the smds.
as far as the 37.4, i thought they were testing okay(but if they weren't please let me know), and i will be replacing the 20ohm ones.
i will probably pull ALL source resistors and take readings out of circuit, and replace as necassary. then test the 20's with the source resistors out.
i am uneasy about replacing the smds as they are super small, and i am using a regular sized tip soldering iron thats a not so good soldering iron to begin with. i have read your site on the tips of desoldering the smds.
The resistors used as the 20 ohm resistors are being used here RARELY open unless the source resistor it's connected to opens.
The 37.4 ohm resistors should read 37.4 ohms ±1%.
You don't need a small tip to solder the 0805s in place. Remove the defective ones. Clean the pads with desoldering braid. Add new solder to one pad. Heat the solder and slide the resistor into the molten solder. Remove the heat but hold the resistor in place until the solder freezes.
The 37.4 ohm resistors should read 37.4 ohms ±1%.
You don't need a small tip to solder the 0805s in place. Remove the defective ones. Clean the pads with desoldering braid. Add new solder to one pad. Heat the solder and slide the resistor into the molten solder. Remove the heat but hold the resistor in place until the solder freezes.
alright tested ALL 37 ohm resistors, i got about 38 on all resistors give or take meter being inaccurate.
the 20r0's are testing about 3 ohms on all besides the one next to one of the .1 ohm resistors i pulled and another tests 40. i think the 3 ohm reding may change when i remove the .1 ohm resitors.
i am ordering all new smd 20r0's and 37r4's just in case, and ordering all new .1 ohm resistors.
heres my list.
36p15-4
28n15-4
1620ctg-4
u1620ctrg-4
.1 ohm resitor-15
20r0 0805-30
37r4 0805-30
the 20r0's are testing about 3 ohms on all besides the one next to one of the .1 ohm resistors i pulled and another tests 40. i think the 3 ohm reding may change when i remove the .1 ohm resitors.
i am ordering all new smd 20r0's and 37r4's just in case, and ordering all new .1 ohm resistors.
heres my list.
36p15-4
28n15-4
1620ctg-4
u1620ctrg-4
.1 ohm resitor-15
20r0 0805-30
37r4 0805-30
are the extra 5 "just in case" i only found 2 bad ones. i just want to assure i am only replacing 2.
All of the output transistors in parallel to the ones that failed have to be replaced. The amp has 6 of each in that channel. All of the outputs in that channel have to be replaced if you want the amp to be as reliable as possible.
If you order the parts by phone, ask for matching date codes on the parts. I don't know if you can request matching codes when ordering through the site.
If you order the parts by phone, ask for matching date codes on the parts. I don't know if you can request matching codes when ordering through the site.
If the two that failed has circuit board designations beginning with a 2, all of the other outputs that start with a 2 need to be replaced.
If you haven't done so yet, you need to read the following post:
http://www.diyaudio.com/forums/car-...-schematics-3.html?postid=1901581#post1901581
http://www.diyaudio.com/forums/car-...-schematics-3.html?postid=1901581#post1901581
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