Denon AVR-1912 E2/EA

[Tha fios agaibh]

I guess the specs sheet from the manufacture would be the best place to look for acceptable esr values.
The huge discrepancy with the esr charts must be because there are so many different types of caps.

I would like to learn more on the subject of esr values myself.

 

[Michael Studio1]

Good question, I usually just look up an esr chart or two as a reference.
I recommend looking at several charts because the resistance values can vary widely.
Note the values change depending on the voltage rating of the same uf value cap.

You can usually check esr in circuit but capacitance must be checked out of circuit.

I wouldn't pay a premium for oem Denon parts, but I would pay a premium for higher temperature ratings or voltage ratings provided they physically fit in the pcb.
View attachment 40425

Thank you John - what a useful chart! I shall print it and attach it to the PEAK ESR Capacitor Test User Manual.
We are going to our Seaside Holiday home tomorrow (where there is nothing between us and the North Pole) for a week or so over Easter - then I have an appointment for Cataract surgery. That will put me out of business for a while, I fancy. Just as well I'm retired! Michael Studio1 UK 20:30BST

 

[Michael Studio1]

Now returned from the cool of the North Norfolk Coast and find the Power Transistors for SBL Channel have arrived. They are now thermally compounded in place awaiting a hot soldering iron.

 

[Tha fios agaibh]

Welcome home Michael.
Hopefully the new transistors will enjoy their home too.

 

[bushtech]

And best of luck with the eye op.
Manual should make more sense afterwards

 

[Michael Studio1]

Welcome home Michael.
Hopefully the new transistors will enjoy their home too.

Thank you John - I have soldered them in now but am cogitating over that C515 - Page106/N6 - it is currently with one leg out of Cct for measurement and I'm finding it OK - Removing one leg from the B'D the Cap. measures: - 45.4μF. 0.19ΩESR in Cct it shows 'leaky'

 

[Michael Studio1]

And best of luck with the eye op.
Manual should make more sense afterwards

Thanks Dries. Op at 12:00 Noon BST. I sha'n't be reading Cct Diags for a little while after this I guess! Michael Studio1 07:55BST

 

[Tha fios agaibh]

I'm finding it OK - Removing one leg from the B'D the Cap. measures: - 45.4μF. 0.19ΩESR in Cct it shows 'leaky'

I think your probably right that it's Ok. The in-ckt leakage may be an inductor or similar component throwing off the reading.

Best of luck on the surgery and a speedy recovery. In the meantime, let someone else do the reading for you.

Regards, John

 

[Michael Studio1]

I think your probably right that it's Ok. The in-ckt leakage may be an inductor or similar component throwing off the reading.

Best of luck on the surgery and a speedy recovery. In the meantime, let someone else do the reading for you.

Regards, John

Thanks John - Op. OK. can see better now with the Right eye - more colour, better definition. I'm grateful for your comment on C515. I will solder it back in place. Meanwhile I am checking all the Electrolytic Caps with the Peak ESR70 and am about 3/4 through the AUDIO_VIDEO PCB. I'm finding no problems except locating them on the B'D. For guidance I'm locating them on the Cct.Diag., finding the closest IC (which are quickly physically identified on the pcb) and going from there. I'm really looking for the reason the two 1.6A fuses blew. Nothing yet. But of course, they're on a different PCB (REG_CNT B'D) and I've checked the two Caps on that. Interestingly, the various 'Options' - like the one on P.115/D9 - make following the Cct.Diag even more of a mine-field. Michael Studio1 UK 16:39BST

 

[Tha fios agaibh]

Hi Michael, congratulations on the surgery.
It must be exciting to have the improved vision. I'm sure you're excited to get back to your electronic tinkering too.

Yes, thats a good strategy to help find the components. Also try the search feature in acrobat reader to help find component numbers. It will also show the component numbers on the "printed wiring boards" such as this layout on page 93.

 

[Michael Studio1]

Hi Michael, congratulations on the surgery.
It must be exciting to have the improved vision. I'm sure you're excited to get back to your electronic tinkering too.

Yes, thats a good strategy to help find the components. Also try the search feature in acrobat reader to help find component numbers. It will also show the component numbers on the "printed wiring boards" such as this layout on page 93.
View attachment 40753

Indeed and Thanks, John. Silly of me not to even think of the Adobe Acrobat application on those PCB's on pp.93-106. Wonderful! Now that I have changed one of my two Dell Inspiron 1545 laptops from Ubuntu to WIN7 (I just happen to have a WIN7 O.S. DVD) I shall be able to access all these once I have downloaded Adobe onto it. The aspect of the attachment you sent is somewhat different to the photos in the Service Manual which are all grey and not very distinct. I shall apply myself to this new venture! Michael Studio1 UK 09:44BST

 

[Michael Studio1]

The eye surgery was only on one eye, of course, the Right one. Interestingly we have low-level strings of coloured LED's on the stair-case and bathroom and looking at these in the dark the Right eye shows them as vivid Blue but the Left eye shows them as vivid Red. I don't know what to make of that. I am hoping for the second Op. in the not too distant future. Michael Studio1 UK 09:459BST

 

[Tha fios agaibh]

The Right eye shows them as vivid Blue but the Left eye shows them as vivid Red. I don't know what to make of that.

I imagine the trama of the cataract surgery could cause inflammation in the eye that may temporarily impact how you perceive colors. Yes, it's always a good idea to get a second opinion.

You may want to search your new operating system to see if Adobe acrobat reader isn't already pre-installed as it's a common program.
One note about .pdf files, is that the aspect often appears grey and grainy at first but will eventually become clearer when you give the page time to fully load. Also when you zoom into a small section for more detail, it will look grey and blotchy for a few seconds until it loads. Then it should look crystal clear.

 

[Michael Studio1]

I imagine the trama of the cataract surgery could cause inflammation in the eye that may temporarily impact how you perceive colors. Yes, it's always a good idea to get a second opinion.

You may want to search your new operating system to see if Adobe acrobat reader isn't already pre-installed as it's a common program.
One note about .pdf files, is that the aspect often appears grey and grainy at first but will eventually become clearer when you give the page time to fully load. Also when you zoom into a small section for more detail, it will look grey and blotchy for a few seconds until it loads. Then it should look crystal clear.

I will find out if this is trauma related when the Left eye is operated on.
As for the WIN7 Dell laptop, it did not have Adobe - so I downloaded it and am just learning how to use it to examine each B'D. The 'greyness' is actually the representation on each B'D of the foil - and doesn't change on enlargement. My 'method' relating to Electrolytic Caps is to test each one with the ESR70, mark the result in the relevant place on the related B'D Parts List in the columns 'Q'ty' and 'New' and stick a small square of masking tape on the top of the cap - to show it's been tested. Eventually I'll have examined all the caps on all but the Front B'D - which is virtually inaccessible. So I am starting with the AUDIO_VIDEO PCB. Michael Studio1 UK 09:28BST

 

[Michael Studio1]

• QUESTION: Continuing measuring Elect.Caps. A_V PCB P.115/J8 C.1014. This Cap tests as 'LEAKY' and is within a marked 'Option' area, and is OPTION 'N'. The table of Options marks this as 'O' for this model:'AREA' E2 (this is an E2/EA version of Model 1912) so: How is this to be interpreted as this Elect.Cap. is in place I shall continue after Lunch. Michael Studio1 UK 12:44BST

 

[Tha fios agaibh]

• • QUESTION: Continuing measuring Elect.Caps. A_V PCB P.115/J8 C.1014. This Cap tests as 'LEAKY' and is within a marked 'Option' area, and is OPTION 'N'. The table of Options marks this as 'O' for this model:'AREA' E2 (this is an E2/EA version of Model 1912) so: How is this to be interpreted as this Elect.Cap. is in place I shall continue after Lunch. Michael Studio1 UK 12:44BST

• I interpret the "0" as a selected circuit option is used, and "x" for option not used.
• I believe thr avr1712 model is a more basic model that does not have many of the options (such as better filtering)that the higher grade models do have.
• For instance, option H says 75-D which is a resistor code for a 590kΩ resistor for your model, while the avr1712 say 0-J meaning a jumper or 0Ω resistor is used.
  

 

[Michael Studio1]

• I interpret the "0" as a selected circuit option is used, and "x" for option not used.
• I believe thr avr1712 model is a more basic model that does not have many of the options (such as better filtering)that the higher grade models do have.
• For instance, option H says 75-D which is a resistor code for a 590kΩ resistor for your model, while the avr1712 say 0-J meaning a jumper or 0Ω resistor is used.

Thank you, John. I didn't know about the '75-D' resistor code for a 590kΩ resistor. I must scrutinise this! Michael Studio1 UK 06:40BST

 

[Michael Studio1]

Now a bit further on in my Test regime. I have 'fast-forwarded' to simply checking the ESR of all the e-caps on the Audio_Video PCB with the PEAK ESR70 meter and putting a 'touch' of red on their tops to show they are tested. I have stopped writing down my individual findings - it was getting laborious. By taking this short-cut I have quickly finished the A-V B'D and re-soldered the cap C936 which has changed its in-Cct reading to 'Leaky/ESR 2.4Ω - with one leg out of the pcb this cap tested as 97μF, ESR 2.4Ω. Now I am tackling the HDMI_B'D in the same manner. Already I find a problem at C799 which tests: 8.96μF/ESR 11.4Ω. Maybe you will recall my having changed its' counter-part C831 when I inadvertently broke it away from its moorings when separating the two pcb's? This new cap tests at 9.6μF/ESR 1.04Ω. With such a high ESR on C799 I feel I should change this cap as well - so I shall. Michael Studio1 UK 11:59BST (Sun's nearly over the yard-arm!)

 

[Michael Studio1]

A bit later: The replacement C799 is now in place and tests: 9.76μF/ ESR 0.75Ω Michael 12:27BST

 

[Michael Studio1]

The AVR is now back together and testing will commence. I know I've been here before but with all the changes of caps I have made - who knows? it may even work! Just to fill you in on the PEAK ESR70 meter I am using here's a link to a YouTube:

Michael Studio1 UK 09:36BST