Denon AVR-1911 blinking led stand by after repair

[coojoe_213]

Hello. I have Denon avr-1911. I like this amplifier, and hope to repair.

Before 2 days led lamp on stand by begin to blink red. I open receiver and:


1. FR chanell was blow. The power transistors 2SD2390/2SB1560 was shorted.
---I replace them with another darlington MN2488/MP1620. I think they are 100% equivalent with 2SD2390/2SB1560. If i wrong, please tell me.
2. 4 resistors 0.47oms, also was open. I replace with 0.33oms (hope this is not problem).

3. 2 resistors 22 oms, also was open. I replace it with same.

4. I the last one three small transistors was short (KTA1268/KTC3206). I replace it with 2SC2240/2SA970. I think they are good equivalent.

5. All zener diodes, all resistors, all trimers, all regulators are fine
I try to reset the proccessor, but no result.
I upload service manual. The bad channel is on 67 page.

I hope for any suggestion :/.

[madan1]

Re: Denon AVR-1911 blinking led stand by after repair

Check again all elements on the channel. Compare the values with the other working channels. Probably you've missed something.

[tibimakai]

Re: Denon AVR-1911 blinking led stand by after repair

I would suggest the same thing. Also, I would use the .47 Ohm resistor and not the .33 Ohm.

[coojoe_213]

Re: Denon AVR-1911 blinking led stand by after repair

Hi. I replace all parts with original, and the situaltion is the same. But i have question.

What is ''TRG''? I have two pins ''TRG 15V'', but i have 12.10V. All diods /d124, d125, d126, d145/ work fine.

In all channel i have 4.2mv...which is perfect, but when i push the button combination, on the display i have ''DC Protect''....

[rhomanski]

Re: Denon AVR-1911 blinking led stand by after repair

TRG usually stands for a "trigger" signal. It should go from 0v to 15v and back to 0v.

[coojoe_213]

Re: Denon AVR-1911 blinking led stand by after repair

Ok, you tell me 'trg'' go from 0v to 15v. I have 12.10v....is that correct value, or must have 15v?

[tibimakai]

Re: Denon AVR-1911 blinking led stand by after repair

There is an idle current adjustment? Did you adjusted it?
Did you reset the receiver after repair?

[coojoe_213]

Re: Denon AVR-1911 blinking led stand by after repair

Hi. Yes, i adjust idle current, all channel are 4.1mv. Yes, i reset receiver after repair:/.
When i use button combination for error /status+mult eq+stb button/ on the display i see PRT DC, and after that receiver turn off. All voltages everywhere is normal.

[coojoe_213]

Re: Denon AVR-1911 blinking led stand by after repair

All work perfect. Tnx all.

[madan1]

Re: Denon AVR-1911 blinking led stand by after repair

what was the problem?

[emel]

Re: Denon AVR-1911 blinking led stand by after repair

All work perfect. Tnx all.

Please Coojoe_213 let other members benefit and learn from your experience. What finally was the problem and what fixed it?