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View topic - Sony STR-DA3300ES Self Help (:

Sony STR-DA3300ES Self Help (:

This forum addresses questions on installation, configuration and troubleshooting you might encounter with your Sony Amp/Receiver/Speakers/Connections/Cables.

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by Giorgimt » Mon Jan 06, 2014 7:56 am

Hello friends, thank you for creating and supporting Sony fan site.
My current issue is with my project DA-3300ES receiver. I bought it "dead." Changed the 8A fuse and then it burned one of the power transistors (MP1620), its accompanying resistor (100 Ohm) and two more resistors on the protector board. I mean, they turned into coal. I replaced all that, as carefully as I could, the unit turns back on, protector kicks in and shuts it off.
Here is interesting part - if I disconnect the left connector board then it stays on and music plays in the right channel just fine. I disassembled everything and double checked speaker connections and all the circuit boards, there are no shorts or any wires hanging. I think my issue is the protector board or power amp itself (Class A amp looks fine).
I'm just an amateur, I can only fix things that I can visually see are burned. If anyone can give me a hint as to where else to look, or what to measure, I would definitely appreciate it! I do not have money to take it to repair shop, because for that price I can buy another used one.
It's sort of a sport with me - I'd like to try and fix it for less then $100. Do you think that's possible? Thanks in advance!

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by Giorgimt » Sun Jan 12, 2014 8:58 pm

Update - found two small transistors on the protector board (Left channel) 2SA1038 that were burned out. Should have tested them right away, but wasn't paying attention. Also, replaced MN2488 power transistor (next to the 1620 that was burned out). Waiting for A1038s ($8.95 each), will report. Thanks for reading!
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by David_S » Sun Jan 12, 2014 9:54 pm

Good to hear that you are making progress on your DA3300ES.  There must not be people on the forum that have worked on this model receiver.

TA- N77ES, E77ES, E80ES, E9000ES
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RM- AX4000, AX1400
APM-55W, APM-33W
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by jehill » Mon Jan 13, 2014 1:49 pm



Welcome to Agoraquest!  Somehow, I missed your post until today.  I have the STR-DA3300 service manual, so I should be able to help. You say that the 100 ohm resistor was open.  What about the 0.22 x 2 5W resistor assembly?  You can check the resistances of these in place (center tap to each side).  When you say the left connector board, are you referring to the CONNECTOR 4 board (left viewed from the front of the receiver)?  If so, that connector provides SBL, SBR, C, 4/8, +7V, -7V, TEMP 4/8 and PROTECT inputs to the A board.
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by jehill » Wed Jan 15, 2014 3:06 am

Please provide component numbers for all of the components that you have found fried and replaced.  In looking at the schematics further, I see that the wiring connected to the 100 ohm resistor that opened passes through the PROTECTOR board to the BIAS board and the A CLASS AMP board.  I would check those boards for blown components as well.  Also, please specify which PROTECTOR board you are talking about: PROTECTOR (F-C), (SB) or (SURR).

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by Giorgimt » Wed Jan 15, 2014 8:36 am

Hello jehill, thank you so much for your advice. You are correct, it is Connector 4. When disconnected, it allows the unit to operate. It also works if I remove the Protector F-C (although sound is very faint, of course). I think this is where the main problem is (until I discover any more). A1038 transistors and three various resistors on Front-Left channel on the F-C protector board were burned out (C1522, R1525, Q1522, R1527, Q1523). On Power Amp (Pg 56) - Q1508, Q1507, R1517 were burned out. Where is 0.22x2 5W resistor assembly you mentioned? Thanks again!
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by Giorgimt » Wed Jan 15, 2014 8:50 am


On 2014-01-13 01:54, David_S wrote:
Good to hear that you are making progress on your DA3300ES.  There must not be people on the forum that have worked on this model receiver.





Thank you for taking time to read my post!
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by jehill » Wed Jan 15, 2014 1:47 pm

The 0.22x2 5W resistor assembly that you need to check is R1516.  Its the rectangular ceramic package next to Q1508 (PNP) and Q1507 (NPN).  The resistor is connected between the emitters of the two transistors.  I can guarantee you that the side connected to Q1508 is open!  The center tap of the resistor is the channel output.  For some reason, Q1508 shorted, which in turn caused the Q1508 side of R1516 to open as well as R1517.  Hopefully, nothing upstream of R1517 was damaged.  The circuitry destroyed on the PROTECTOR (F-C) board monitors the voltage across R1516 as an indication of power.  Normally, the voltage is extremely low, since the total resistance of R1516 is only 0.44 ohms.  When the side of R1516 connected to Q1508 opened, it applied B- across the circuitry, destroying it.

Do you have the service manual?  If not, disguise your email address and I will send you an electronic copy.


-----------------
-John

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by Giorgimt » Wed Jan 15, 2014 9:47 pm

You are right again!! I have no idea how you made that connection, but R1516 was bad (although I think it was Q1507 side). I always admired people's ability to read schematics and I thank you for that! I will try to get the resistor tomorrow. I've been looking online, but no luck yet. A lot of the things for this amp seem to be no longer in production, or have been relabeled.

----------

Also, I just discovered today that on A Class Amp I had three blown electrolytic capacitors! (C1558, C1508, C1608). I could have sworn that they were fine before. I replaced them with a little higher capacitance (470 mF, instead of 330 - couldn't find exact match), but same voltage 25V caps. Nothing else seems damaged, tested whatever I could. Thanks again!



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by jehill » Thu Jan 16, 2014 7:56 am

The Sony part number for R1516 is 1-234-572-21.  You are right.  It isn't available from Sony.  However, the part number for a similar resistor used in the STR-DA5800ES is 1-234-182-11 and it is available for $8.03 from Sony at  https://servicesales.sel.sony.com/ecom/accessories/web/index.jsp.  Use the Part Number search to locate the part.  To access the Part Number search, click any accessory category and wait for the next page to appear.  A new search option will appear at the top right.  Click the down arrow to select the Part Number search.


Although the dimensions may be slightly different, this is probably the best that you can do.

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