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Noob diamond audio d5600.4 no output on channel 1 and 2
Noob diamond audio d5600.4 no output on channel 1 and 2
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Old 21st October 2019, 09:08 PM   #1
Summitp is offline Summitp  United States
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Default Noob diamond audio d5600.4 no output on channel 1 and 2

Hi guys, I'm very happy to have stumbled across this forum. I've had fun with car audio for a little while now, and have decided I want to fix an amp that I recently acquired. It is a diamond audio d5 600.4. channels 3 and 4 play cleanly, but I get no output other than a very faint hiss from channels 1 and 2.

The power supply obviously works, as channels 3 and 4 produce output, and the rails show +30v and -30 volts, and the +15v and -15v sections also check out.

I do see what look like two blown resistors in the channel 2 section, and w resistors that look like they are blackening, but resistance still checks out in channel 1.

I have been testing the output transistors with a multimeter in diode mode, and don't think I have any failed ones.

Why would those resistors burst on channel 1 and 2?
I'm a bit of a noob, but I can follow directions pretty well. Hoping to fix this thing and see how it sounds...
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Old 22nd October 2019, 01:59 AM   #2
Perry Babin is offline Perry Babin  United States
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It could have been due to an external fault. Replace them and see if they start to heat up.

Power up through a limiter or low rated fuse and either clamp the transistors down or very carefully monitor their temperature.
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Old 22nd October 2019, 06:12 AM   #3
Summitp is offline Summitp  United States
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Thanks for the response. I have found the two offending resistors in the schematic. Should I be concerned about the two transistors leading up to the resistors? Why would only the two on the positive rail side burnt up?
Thanks. I'll be trying to pick up some resistors tomorrow. 220ohm and 100 ohm.
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Old 22nd October 2019, 08:52 AM   #4
Perry Babin is offline Perry Babin  United States
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You should at least check the transistors in the circuit to confirm that none are shorted.

Where did you get the diagram? I didn't see the 600.4 on the site I checked.
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Old 22nd October 2019, 12:42 PM   #5
Summitp is offline Summitp  United States
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I didn't find the 600.4 diagram. I found the 300.4 and 600.2 diagrams. I checked the input section based off the 300.4, and when it goes to ch1pwrin to the output section, I referred to the 600.2 diagram. The output layout of the 600.2 has 6 output transistors per channel, to the 600.4 4 per channel. I got the diagrams from elektrotanya.
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Old 22nd October 2019, 01:30 PM   #6
Perry Babin is offline Perry Babin  United States
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I had the others.
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Old 22nd October 2019, 02:37 PM   #7
Summitp is offline Summitp  United States
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Aha! I went back this morning quickly before leaving the house, and testing some of the transistors, this mpsa56 PNP guy is toast. Shorted from collector to emitter. And the case is popped. So will look to replace this as well.
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Old 22nd October 2019, 03:19 PM   #8
Summitp is offline Summitp  United States
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Email sent. Thank you for your help Mr. Perry!
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Old 22nd October 2019, 05:18 PM   #9
Summitp is offline Summitp  United States
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I will picking up some resistors and transistors today at the store, they don't have the 221 ohm resistor, but they do have a 220 ohm resistor. If I replace both, it should work ok, I think... good thought process? Or severe misunderstanding of how the circuit works?

Also, they do have the correct blown transistor, the (q37 in the diagram) MPSA56 for the negative side of the wave, but for the top part, (q29 in the diagram) they do not have the MPSA06. They do have both of the items specified on the diagram though, the TIP41C and TIP42C. Those are the transitors specified for the d5 600.2, while the MPS items are what came in those locations for the d5 600.4. They seem to be just larger beefier transistors. Would they cause a problem in the 600.4? I could also replace Q8 at the end of the circuit.

Anyway, plan is replace resistors, replace one toasted transistor, see if it works, if it does, then try the bigger transistors and see what happens.

Thanks again.
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Old 22nd October 2019, 09:36 PM   #10
Perry Babin is offline Perry Babin  United States
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The larger drivers are probably used because the output stage has more transistors to drive. The TIP drivers may work but could also case problems if the circuit has any other differences. You'd need a scope to confirm that the drivers are working properly in the circuit.

The pin configuration is different so you'd have to twist or otherwise reconfigure the leads to make the TIP drivers fit.

I'd suggest ordering the right parts (not from ebay).
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