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  #1  
Old 04-16-2012, 01:49 PM
bzb882 bzb882 is online now
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AU-217 recap questions

I picked up an AU-217 that I plan to recap. Does anyone have a parts list that they used to recap theirs? I realize mine may not be exactly the same, but at least it’s a starting place. Of the parts I plan to replace, the service manual only lists two electrolytic caps, 6 fusible resistors, and two VD1212 diodes.. Also, it looks like the 4 output transistors on mine were changed at some point. From left to right while facing the front of the unit I have: 2SD424 (Toshiba), 2SB564 (Toshiba), B545A (NEC) and D188A (NEC). The last two look fairly new, the first two look like they may be original, but the service manual calls for 2SD188A and 2SB545A. Does anyone have a unit with original outputs that can confirm that the service manual is correct? I’ve seen MJ21193 and MJ21194 listed in another thread as suitable replacements, can I just buy 2 of each and reasonably expect them to be close enough in value?
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  #2  
Old 04-18-2012, 05:05 AM
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Hyperion Hyperion is offline
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Quote:
Originally Posted by bzb882 View Post
I picked up an AU-217 that I plan to recap. Does anyone have a parts list that they used to recap theirs? I realize mine may not be exactly the same, but at least it’s a starting place. Of the parts I plan to replace, the service manual only lists two electrolytic caps, 6 fusible resistors, and two VD1212 diodes.
I am surprised that there are not more electrolytic caps, but if you are referring to the service manual for a list - please don't - look in the amp itself for your shopping list. DO change the fusible resistors - for ¼ or ½ watt metal film types, and the VD1212 dual diodes - change each for series pairs of 1N4148 diodes. Have you decided what capacitors to use?.... may I recommend Panasonic FC & FM. I normally use FM in all PSU/filtering locations and FC everywhere else, and maybe Nichicon FG for signal path locations. People often find taking pictures before starting helps with later component orientation/wiring queries - so, take lots of pictures.

Quote:
Originally Posted by bzb882 View Post
Also, it looks like the 4 output transistors on mine were changed at some point. From left to right while facing the front of the unit I have: 2SD424 (Toshiba), 2SB564 (Toshiba), B545A (NEC) and D188A (NEC). The last two look fairly new, the first two look like they may be original, but the service manual calls for 2SD188A and 2SB545A. Does anyone have a unit with original outputs that can confirm that the service manual is correct? I’ve seen MJ21193 and MJ21194 listed in another thread as suitable replacements, can I just buy 2 of each and reasonably expect them to be close enough in value?
If those output transistors are functional, you could leave them alone and not replace them. However if any of them show any signs of problems I would replace them all - you are correct to say that 2 each of MJ21193 & MJ21194 (1 of each per channel) are the most suitable replacements.

Good luck with it - please post your progress and results - we don't often see an AU-217 being reconditioned
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Last edited by Hyperion; 04-18-2012 at 05:11 AM.
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  #3  
Old 04-18-2012, 04:01 PM
bzb882 bzb882 is online now
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Thanks for the reply, Hyperion. I took the day off and pulled all the electrolytic caps (one bipolar), the two VD1212s and the 8 fuse resistors. All of the fuse resistors had drifted higher, one of the 220 ohms (R40) read 987 ohms. I generally use Panasonic too. I also cleaned off all of the glue. I couldn't find where it was a problem in the Au-217, but why take the chance.
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  #4  
Old 04-22-2012, 09:17 PM
bassnutt bassnutt is offline
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Im about to do the same for a work unit with matching tuner for my tool box with some small JBLs.I can not seem to find a service manual for this anyone tell me what the value of the fuse resistors.And the location and value of that bi polar cap.Thanks.

Last edited by bassnutt; 04-22-2012 at 09:20 PM.
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  #5  
Old 04-22-2012, 10:03 PM
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pete_mac pete_mac is offline
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The bipolar is a 47uf 6.3V

I've attached an extract from a very basic spreadsheet that I put together when recapping a friend's AU-217. Note that it excldues the 1N4148 diodes and fuse resistors, as I have a stash of those ready to go and didn't need to purchase any.
Attached Files
File Type: pdf AU217 recap.pdf (5.5 KB, 66 views)
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  #6  
Old 04-23-2012, 07:06 AM
skippy124 skippy124 is offline
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Quote:
Originally Posted by bassnutt View Post
I can not seem to find a service manual for this anyone tell me what the value of the fuse resistors.And the location and value of that bi polar cap.Thanks.
There is a PDF of the service manual in the AK database

http://akdatabase.org/AKview/display...lbum=28&pos=73
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  #7  
Old 04-23-2012, 12:42 PM
bzb882 bzb882 is online now
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Actually, there are two bipolar caps, C601 and C602 on the big board. Here's my list; you'll need 4 diodes to replace the two VD1212s.

Equalizer Board C01 1 uF 50 V
Equalizer Board C02 1 uF 50 V
Equalizer Board C05 100 uF 6.3 V
Equalizer Board C06 100 uF 6.3 V
Equalizer Board C13 47 uF 10 V
Equalizer Board C14 47 uF 10 V
Equalizer Board C15 3.3 uF 50 V
Equalizer Board C16 3.3 uF 50 V
Equalizer Board C617 220 uF 35 V
Equalizer Board C618 220 uF 35 V
Equalizer Board C619 220 uF 35 V
Power Amp Board C01 1 uF 50 V
Power Amp Board C02 1 uF 50 V
Power Amp Board C07 47 uF 50 V
Power Amp Board C08 47 uF 50 V
Power Amp Board C09 330 uF 50 V
Power Amp Board C10 330 uF 50 V
Power Amp Board C11 47 uF 6.3 V
Power Amp Board C12 47 uF 6.3 V
Power Amp Board C15 330 uF 50 V
Power Amp Board C16 330 uF 50 V
Power Amp Board C23 100 uF 6.3 V
Power Amp Board C24 100 uF 6.3 V
Power Amp Board C25 100 uF 6.3 V
Power Amp Board C26 100 uF 6.3 V
Power Amp Board C27 1 uF 50 V
Power Amp Board C28 1 uF 50 V
Power Amp Board C29 470 uF 6.3 V
Power Amp Board C30 470 uF 6.3 V
Power Amp Board C601 47 uF 6.3 V bipolar
Power Amp Board C602 1 uF 50 V bipolar
Power Amp Board C604 470 uF 6.3 V
Power Amp Board C605 47 uF 50 V
Power Amp Board C606 470 uF 50 V
Power Amp Board C607 470 uF 50 V
Power Amp Board C608 100 uF 50 V
Power Amp Board C609 100 uF 50 V
Power Amp Board C610 100 uF 50 V
Power Amp Board C611 100 uF 50 V
Power Amp Board C612 6800 uF 50 V
Power Amp Board C613 6800 uF 50 V
Power Amp Board C621 3.3 uF 50 V
Power Amp Board C622 3.3 uF 50 V
Power Amp Board R39 220 ohm 1/4 W
Power Amp Board R40 220 ohm 1/4 W
Power Amp Board R41 220 ohm 1/4 W
Power Amp Board R42 220 ohm 1/4 W
Power Amp Board R43 6.8 ohm 1/4 W
Power Amp Board R44 6.8 ohm 1/4 W
Power Amp Board R45 6.8 ohm 1/4 W
Power Amp Board R46 6.8 ohm 1/4 W
Power Amp Board VS01 VD1212
Power Amp Board VS02 VD1212
Tone Control Board VR01 250 k ohm
Tone Control Board VR02 250 k ohm
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  #8  
Old 04-23-2012, 08:55 PM
bassnutt bassnutt is offline
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Quote:
Originally Posted by bzb882 View Post
Actually, there are two bipolar caps, C601 and C602 on the big board. Here's my list; you'll need 4 diodes to replace the two VD1212s.

Equalizer Board C01 1 uF 50 V
Equalizer Board C02 1 uF 50 V
Equalizer Board C05 100 uF 6.3 V
Equalizer Board C06 100 uF 6.3 V
Equalizer Board C13 47 uF 10 V
Equalizer Board C14 47 uF 10 V
Equalizer Board C15 3.3 uF 50 V
Equalizer Board C16 3.3 uF 50 V
Equalizer Board C617 220 uF 35 V
Equalizer Board C618 220 uF 35 V
Equalizer Board C619 220 uF 35 V
Power Amp Board C01 1 uF 50 V
Power Amp Board C02 1 uF 50 V
Power Amp Board C07 47 uF 50 V
Power Amp Board C08 47 uF 50 V
Power Amp Board C09 330 uF 50 V
Power Amp Board C10 330 uF 50 V
Power Amp Board C11 47 uF 6.3 V
Power Amp Board C12 47 uF 6.3 V
Power Amp Board C15 330 uF 50 V
Power Amp Board C16 330 uF 50 V
Power Amp Board C23 100 uF 6.3 V
Power Amp Board C24 100 uF 6.3 V
Power Amp Board C25 100 uF 6.3 V
Power Amp Board C26 100 uF 6.3 V
Power Amp Board C27 1 uF 50 V
Power Amp Board C28 1 uF 50 V
Power Amp Board C29 470 uF 6.3 V
Power Amp Board C30 470 uF 6.3 V
Power Amp Board C601 47 uF 6.3 V bipolar
Power Amp Board C602 1 uF 50 V bipolar
Power Amp Board C604 470 uF 6.3 V
Power Amp Board C605 47 uF 50 V
Power Amp Board C606 470 uF 50 V
Power Amp Board C607 470 uF 50 V
Power Amp Board C608 100 uF 50 V
Power Amp Board C609 100 uF 50 V
Power Amp Board C610 100 uF 50 V
Power Amp Board C611 100 uF 50 V
Power Amp Board C612 6800 uF 50 V
Power Amp Board C613 6800 uF 50 V
Power Amp Board C621 3.3 uF 50 V
Power Amp Board C622 3.3 uF 50 V
Power Amp Board R39 220 ohm 1/4 W
Power Amp Board R40 220 ohm 1/4 W
Power Amp Board R41 220 ohm 1/4 W
Power Amp Board R42 220 ohm 1/4 W
Power Amp Board R43 6.8 ohm 1/4 W
Power Amp Board R44 6.8 ohm 1/4 W
Power Amp Board R45 6.8 ohm 1/4 W
Power Amp Board R46 6.8 ohm 1/4 W
Power Amp Board VS01 VD1212
Power Amp Board VS02 VD1212
Tone Control Board VR01 250 k ohm
Tone Control Board VR02 250 k ohm
Thanks.
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  #9  
Old 04-23-2012, 09:44 PM
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pete_mac pete_mac is offline
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Ah yeah, fair call. I always replace 1uf 50V bipolars with a 1uf 50V film capacitor (as per all of the 1uf caps) so I never put them down on my lists. My bad!
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  #10  
Old 04-24-2012, 07:59 PM
bzb882 bzb882 is online now
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I forgot to mention, I didn't find any errors on the printed circuit boards.
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