Discussion in 'Yamaha' started by amr2, Mar 20, 2018.
looks like some serious cleaning and detailing on those units before it is time to do much of anything. Enjoy getting intimate with your new amps.
Clean clean and then some more CLEAN
Yes. It needs a lot of cleaning! I’m going to restore them as best I can.
more toyz for the Yammi boyz
Can't wait to see this restoration
I'm going to add a speaker protection module inside. Something compact that can be added elegantly.
I've repaired and refurbished two P2200s, one had a intermittent popping sound after the repair. Traced the problem down to some counterfeit transistors (tested OK on the cheap transistor tester), see picture below. Both of my P2200s sound really good, they are my favorites. I didn't add speaker protection, but I did a couple of 2 amp inline fuses to my speaker cable, I hope it's enough protection. Looking forward to seeing what you do for speaker protection.
counterfeits.... A couple of weeks ago I repaired an amplifier, somone tried to repair it before. And I found this:
BF245A, N-channel silicon field-effect transistor:
About the protection, I already have the modules, one per channel. I'll put them next to the output connectors, reversibly and without modifying the chassis. I hope to upload some pics soon.
I'm also looking forward to seeing your protection circuit placement. I just recently got a P2201 (a P2200 without the meters) and have been wondering how to retrofit a DC protection/delay circuit in it.
I have a complete 22 page service manual for P2200 if that will help in your Yamaha project. I have 3 P-2200 I’m building a vintage system with
The speaker protección modules. One for each channel
Are you going to use separate transformer to power those protection modules? These are the modules I plan to use:
No, I’m going to use the BE lines (13 VAC)
Link to the modules I bought. Based on UPC1237 chip
I saw that unit when I was looking, I think it'll work great. Do you know how much current it'll draw? Do you plan to use an inline fuse? I thought about using the BE lines, I was just a bit concerned about the current draw (should be small though, relay coil draws 77mA) and injecting noise into the amplification stage.
I have to check it, but I think the current draw should be low, less than 100mA, and noise shouldn’t be a problem.
I did not plan to use an inline fuse.
Installed my speaker protection boards yesterday, I ended up using BE (13V. AC) to power the modules. Here are some pictures of right side installation (left side was complete first).
Speaker Protection Board
Speaker Protection Board by bmanone posted May 14, 2018 at 4:34 PM
Locating the Board
Locating The Board by bmanone posted May 14, 2018 at 4:34 PM
Mounting holes drilled and tapped
Mounting Holes Drilled And Tapped by bmanone posted May 14, 2018 at 4:34 PM
Rubber insulator sheet
Insulator by bmanone posted May 14, 2018 at 4:34 PM
Screws and spacers in place on board
Screws And Spacers by bmanone posted May 14, 2018 at 4:34 PM
Board Mounted by bmanone posted May 14, 2018 at 4:34 PM
Board Wired by bmanone posted May 14, 2018 at 4:34 PM
Board wired to speaker terminals, BE ac power, and right amplifier board
Board Wired To Rt Amp And Sp Outs by bmanone posted May 14, 2018 at 4:34 PM
Protection Board installed showing clearance to amp board
Clearance View by bmanone posted May 14, 2018 at 4:34 PM
Buttoned Up by bmanone posted May 14, 2018 at 4:27 PM
The P2200 works great with the protection board installed. No more turn-on pop, no more playing on after the unit is powered off, and lastly no more worry about excessive dc offset causing speaker damage. This board does not protect the amplifier from dead shorts across the speaker terminals.
Excelent work Barry! This is how I plan to place the modules.
BTW, what capacitors have you used to recap the boards? Panasonic FC?
Thanks, I used Panasonic FC's:
4 x P10352-ND EEU-FC1J471 CAP ALUM 470UF 20% 63V RADIAL
4 x P10301-ND EEU-FC1V471 CAP ALUM 470UF 20% 35V RADIALVishay axial:
2 x 4245PHBK-ND MAL213818221E3 CAP ALUM 220UF 20% 63V AXIALEPCOS (TDK) Film:
2 x 495-5047-1-ND B32529C0474J189 CAP FILM 0.47UF 5% 63VDC RADIALNichicon Aluminum Poly:
2 x 493-3711-ND RR71A101MDN1 CAP ALUM POLY 100UF 20% 10V T/HI also replaced the common anode and common cathode diode arrays with these Schottky types:
2 x 1655-1098-ND MBRF10150CTR DIODE ARRAY SCHOTTKY 150V ITO220
2 x 1655-1097-ND MBRF10150CT DIODE ARRAY SCHOTTKY 150V ITO220I had 3 of 4 (D114 and D115) diode arrays fail on one of my P2200s. These SCHOTTKY diodes have the added benefit of a lower voltage drop to rectify BE, offsetting the voltage drop cause by the speaker protection boards!
Hope this helps with your project!
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