Welcome to the AudioShark Forums.
Results 1 to 19 of 19
  1. #1
    Member
    Join Date
    May 2017
    Location
    Ohio, USA
    Posts
    96

    Question X250.8 Fuse Blown?

    So we've been having some very strong wind gusts here today in northeast Ohio and one of them knocked out the power very briefly. Everything cycled back on okay except for my X250.8. I've tried turning it off and on again with the rocker switch on the back, cycling it off and on again using the push button switch on the front. Even tried unplugging from the wall and plugging back in. Nada.

    I suspect I may have blown the protection fuse in the amp. I do have the replacement fuse that came with the amp. Three questions:

    1) Is there an easy way of telling whether the fuse is blown?
    2) Any advice on replacing the fuse without damaging anything? I know enough to unplug the amp while the fuse is being changed, but any advice on which tool to use to get the old one out?
    3) I'm assuming the blown fuse is located between the IEC inlet and the power rocker switch?

    Any advice would be most welcome!

    (Note: I did consult the owner's manual. Not a lot of help.)
    Electronics: Pass Labs XP-22, Pass Labs X250.8
    Digital: OPPO UDP-205, Auralic Aries G1, Bryston BDA-3
    Analog: U-turn Orbit Custom w/ Ortofon 2M Blue, iFi iPhono3
    Speakers: Janszen Carmelita, SVS SB13-Ultra
    Other: David Laboga Custom Audio/Shunyata/Audioquest cabling, Panamax power conditioner

  2. #2

    Re: X250.8 Fuse Blown?

    Do not change before 24 or 48 hours in order to allow time to discharge the capacitors ...

  3. #3
    Member
    Join Date
    May 2017
    Location
    Ohio, USA
    Posts
    96

    Re: X250.8 Fuse Blown?

    Well, that won't be a problem because I can't figure out how to get the fuse holder open without scratching the hell out of the casing (which I obviously would like to avoid).
    Electronics: Pass Labs XP-22, Pass Labs X250.8
    Digital: OPPO UDP-205, Auralic Aries G1, Bryston BDA-3
    Analog: U-turn Orbit Custom w/ Ortofon 2M Blue, iFi iPhono3
    Speakers: Janszen Carmelita, SVS SB13-Ultra
    Other: David Laboga Custom Audio/Shunyata/Audioquest cabling, Panamax power conditioner

  4. #4

    Re: X250.8 Fuse Blown?

    can you put a picture?

  5. #5

    Re: X250.8 Fuse Blown?

    Since you have a factory replacement fuse, did you take the top cover off and see if you can find the fuse that is identical to the replacement fuse? Do you have a DVM? If so, once you pull the fuse out from the holder you can check for continuity from one side of the fuse to the other. If you don’t have a DVM, but you have found the correct fuse, just remove it gently with your fingers and replace it with the new one.
    Micro Seiki SX-8000 air bearing table, SME 312s arm, SME 3012R arn, Dynavector XV-1s cartridge, Lyra Etna SL cartridge, ARC Ref 3 phono stage, Otari MX-55 2 track R2R, Ampex 350 tape repros, Roon Nucleus Plus music server, PS Audio DSJ DAC, ARC Ref 6, ARC Ref 75 with KT-150s, JBL 4345 speakers, Viero Equilibro Level 3 speaker cables, and Definitive Technology Ref subs.

  6. #6
    Senior Member
    Join Date
    May 2017
    Location
    Cleveland, Ohio, USA
    Posts
    401

    Re: X250.8 Fuse Blown?

    So we've been having some very strong wind gusts here today in northeast Ohio
    That's an understatement to say the least!
    Lorain harbor saw some 75 MPH gusts.
    The Brown's football stadium, which is more protected from WSW winds, still saw some gusts in the high 50's during the game (same story as two weeks ago).
    Fairport Harbor had some 70 MPH gusts.

  7. #7
    Member
    Join Date
    May 2017
    Location
    Ohio, USA
    Posts
    96

    Re: X250.8 Fuse Blown?

    Quote Originally Posted by mep View Post
    Since you have a factory replacement fuse, did you take the top cover off and see if you can find the fuse that is identical to the replacement fuse? Do you have a DVM? If so, once you pull the fuse out from the holder you can check for continuity from one side of the fuse to the other. If you don’t have a DVM, but you have found the correct fuse, just remove it gently with your fingers and replace it with the new one.
    Is the fuse inside the chassis? I had assumed it was accessible from the outside in the spot between the IEM power inlet and the power rocker switch.

    I'm assuming that DVM = Digital Volt Meter?
    Electronics: Pass Labs XP-22, Pass Labs X250.8
    Digital: OPPO UDP-205, Auralic Aries G1, Bryston BDA-3
    Analog: U-turn Orbit Custom w/ Ortofon 2M Blue, iFi iPhono3
    Speakers: Janszen Carmelita, SVS SB13-Ultra
    Other: David Laboga Custom Audio/Shunyata/Audioquest cabling, Panamax power conditioner

  8. #8
    Senior Member
    Join Date
    May 2013
    Location
    Tallahassee, Florida
    Posts
    3,005

    Re: X250.8 Fuse Blown?

    From the manual

    "The larger amps do not have any user serviceable fuses. On
    these larger amplifiers the rear panel switch is a thermal magnetic circuit breaker."
    Main - JVC QL-Y7/Denon DL-301 Mk II, Gold Note PH-10, Nuprime CDT-8, Auralic Aries G1, Aqua La Voce S3, Supratek Chardonnay, PS Audio BHK 250, Verity Otello, (2) Rythmik F12SE, Audio Envy IC's & PC's, Triode Wire Lab SC, PC's & USB , PS Audio Stellar P3, Timbernation rack

    Family Room - Oppo UDP-203, Teac NT505, Kinki Studio EX-M1+, Nola KO, (2) Rythmik F-12G, Wireworld SC & IC's, Neotech PC's, SurgeX SA-1810

    Greenville, SC- Marantz HD-CD1, Auralic Aries, PSA Directstream Sr., Audia Flight FL Three S, Reynaud Abscisse Jubilee, (2) RSL Speedwoofers, iFi Audio Power Station, Audio Envy IC's and SC's, Triode Wire Lab PC's, Furutech NCF Clear Line.

  9. #9

    Re: X250.8 Fuse Blown?

    Quote Originally Posted by Jack View Post
    From the manual

    "The larger amps do not have any user serviceable fuses. On
    these larger amplifiers the rear panel switch is a thermal magnetic circuit breaker."
    So how did his amp come with a replacement fuse if there are no user serviceable fuses?
    Micro Seiki SX-8000 air bearing table, SME 312s arm, SME 3012R arn, Dynavector XV-1s cartridge, Lyra Etna SL cartridge, ARC Ref 3 phono stage, Otari MX-55 2 track R2R, Ampex 350 tape repros, Roon Nucleus Plus music server, PS Audio DSJ DAC, ARC Ref 6, ARC Ref 75 with KT-150s, JBL 4345 speakers, Viero Equilibro Level 3 speaker cables, and Definitive Technology Ref subs.

  10. #10

    Re: X250.8 Fuse Blown?

    Call Pass Labs tomorrow and explain the situation to them and see what they recommend.
    Micro Seiki SX-8000 air bearing table, SME 312s arm, SME 3012R arn, Dynavector XV-1s cartridge, Lyra Etna SL cartridge, ARC Ref 3 phono stage, Otari MX-55 2 track R2R, Ampex 350 tape repros, Roon Nucleus Plus music server, PS Audio DSJ DAC, ARC Ref 6, ARC Ref 75 with KT-150s, JBL 4345 speakers, Viero Equilibro Level 3 speaker cables, and Definitive Technology Ref subs.

  11. #11
    Senior Member
    Join Date
    May 2013
    Location
    Tallahassee, Florida
    Posts
    3,005

    Re: X250.8 Fuse Blown?

    Like you said he'll have to wait until in the morning until Pass or Reno opens up to find out. From the photo on Pass' website doesn't look like an active fuse holder next to the IEC to me.
    Main - JVC QL-Y7/Denon DL-301 Mk II, Gold Note PH-10, Nuprime CDT-8, Auralic Aries G1, Aqua La Voce S3, Supratek Chardonnay, PS Audio BHK 250, Verity Otello, (2) Rythmik F12SE, Audio Envy IC's & PC's, Triode Wire Lab SC, PC's & USB , PS Audio Stellar P3, Timbernation rack

    Family Room - Oppo UDP-203, Teac NT505, Kinki Studio EX-M1+, Nola KO, (2) Rythmik F-12G, Wireworld SC & IC's, Neotech PC's, SurgeX SA-1810

    Greenville, SC- Marantz HD-CD1, Auralic Aries, PSA Directstream Sr., Audia Flight FL Three S, Reynaud Abscisse Jubilee, (2) RSL Speedwoofers, iFi Audio Power Station, Audio Envy IC's and SC's, Triode Wire Lab PC's, Furutech NCF Clear Line.

  12. #12
    Senior Member
    Join Date
    Dec 2019
    Location
    Florida
    Posts
    540

    Re: X250.8 Fuse Blown?

    On the rear panel is a master switch and additionally a fuse holder on the smaller amps. The fuse holder accepts type 3AG (6.3mm x 32mm) 250 volt glass fuses of the slow blow variety.

    Please consult the Pass Laboratories factory if you have any question on these fuses or need replacements. The larger amps do not have any user serviceable fuses. On these larger amplifiers the rear panel switch is a thermal magnetic circuit breaker.

    https://www.passlabs.com/wp-content/...-8-amps_om.pdf
    You also have a XP-22? It uses a fuse doesn’t it? Check the type of fuse you have. Is it type 3AG (6.3mm x 32mm) 250 volt glass fuses of the slow blow variety? If not, then depending upon the rest of your equipment, it might go with your XP-22 and not your amp.

    Recheck that your power cord is properly plugged into the 250.8. Wiggle it in a little and see if it works. If it doesn’t, I would unplug my entire system. Then go back to my home breaker panel and power off every breaker that operates my system for 30 seconds and then toggle them back on. Then plug your system back in and see if it works. If it still doesn’t, then call Pass in the AM.


    I wish you well.
    Sincerely,


    Joe

    “Not everything that can be counted counts, and not everything that counts can be counted." – William Bruce Cameron

    Amps: Pass X260.8s *** Pre-Amp: Pass XP22 *** Headphone Amp: Pass HPA-1 *** Speakers: Magico A3’s *** Magico A3 Grills *** Headphones: Focal Utopia *** Digital: Luxman D-08u SACD *** Aurender ACS10 CD Ripper & N100 Streamer *** Power: Shunyata Hydra Alpha A12 Power Conditioner *** AQ NRG Edison 20 *** Cables: Shunyata *** Rack: Bamboo SVT Quadrasphire *** Accessories: Herbie's Audio Lab Giant Titanium Cone Decoupling Gliders *** Russ Andrews Cable Elevators

  13. #13
    Member
    Join Date
    May 2017
    Location
    Ohio, USA
    Posts
    96

    Re: X250.8 Fuse Blown?

    Quote Originally Posted by Calvin View Post
    You also have a XP-22? It uses a fuse doesn’t it? Check the type of fuse you have. Is it type 3AG (6.3mm x 32mm) 250 volt glass fuses of the slow blow variety? If not, then depending upon the rest of your equipment, it might go with your XP-22 and not your amp.

    Recheck that your power cord is properly plugged into the 250.8. Wiggle it in a little and see if it works. If it doesn’t, I would unplug my entire system. Then go back to my home breaker panel and power off every breaker that operates my system for 30 seconds and then toggle them back on. Then plug your system back in and see if it works. If it still doesn’t, then call Pass in the AM.


    I wish you well.
    I do indeed have an XP-22. That came with an extra fuse as well in its own box. This one I definitely pulled out of the box from the X250.8. I'm extra certain of that because I pulled the jumper pins from the two XLR inputs (so I could use them) and put the pins in the same little baggie as the fuse so I wouldn't lose track of them.

    I should also mentioned that I thought of the circuit breaker idea, too. Nothing appears to have been tripped and the UPC plugged into the other plug in the same outlet works perfectly fine.

    Having to ship it back to Reno or Pass would really stink, but I'm not about to start digging around inside the chassis and end up voiding the warranty.

    I guess I'll start with a call to Reno tomorrow afternoon and see where to go from there.
    Electronics: Pass Labs XP-22, Pass Labs X250.8
    Digital: OPPO UDP-205, Auralic Aries G1, Bryston BDA-3
    Analog: U-turn Orbit Custom w/ Ortofon 2M Blue, iFi iPhono3
    Speakers: Janszen Carmelita, SVS SB13-Ultra
    Other: David Laboga Custom Audio/Shunyata/Audioquest cabling, Panamax power conditioner

  14. #14
    Senior Member
    Join Date
    Dec 2019
    Location
    Florida
    Posts
    540

    Re: X250.8 Fuse Blown?

    Quote Originally Posted by tino27 View Post
    I do indeed have an XP-22. That came with an extra fuse as well in its own box. This one I definitely pulled out of the box from the X250.8. I'm extra certain of that because I pulled the jumper pins from the two XLR inputs (so I could use them) and put the pins in the same little baggie as the fuse so I wouldn't lose track of them.

    I should also mentioned that I thought of the circuit breaker idea, too. Nothing appears to have been tripped and the UPC plugged into the other plug in the same outlet works perfectly fine.

    Having to ship it back to Reno or Pass would really stink, but I'm not about to start digging around inside the chassis and end up voiding the warranty.

    I guess I'll start with a call to Reno tomorrow afternoon and see where to go from there.
    Sounds like you’ve covered all the bases then. I guess Pass must think a 250 amp is small. I wouldn’t have guessed that.... Maybe Reno will have another idea without you having to ship it back. Sorry ...
    Sincerely,


    Joe

    “Not everything that can be counted counts, and not everything that counts can be counted." – William Bruce Cameron

    Amps: Pass X260.8s *** Pre-Amp: Pass XP22 *** Headphone Amp: Pass HPA-1 *** Speakers: Magico A3’s *** Magico A3 Grills *** Headphones: Focal Utopia *** Digital: Luxman D-08u SACD *** Aurender ACS10 CD Ripper & N100 Streamer *** Power: Shunyata Hydra Alpha A12 Power Conditioner *** AQ NRG Edison 20 *** Cables: Shunyata *** Rack: Bamboo SVT Quadrasphire *** Accessories: Herbie's Audio Lab Giant Titanium Cone Decoupling Gliders *** Russ Andrews Cable Elevators

  15. #15
    Senior Member
    Join Date
    May 2013
    Location
    Silicon Valley
    Posts
    2,497

    Re: X250.8 Fuse Blown?

    Is the amp plugged into an AC circuit also used by other gear? Or is it plugged into a dedicated AC line? If it is a dedicated line make sure the breaker hasn't tripped.
    Bud

    Lumin X1 file player
    Sony XA-5400ES SACD
    Pass XP-22 pre, X600.5 amps
    Magico S5 MKII Mcast Rose speakers, SPOD spikes

    Shunyata Triton v3/Typhon QR for preamp, Denali 2000 (2) for amps
    Shunyata Sigma XLR analog ICs, Sigma speaker cables
    Shunyata Sigma HC (2), Sigma Analog, Sigma Digital, Z Anaconda (3) power cables

    Mapleshade Samson V.3 four shelf solid maple rack, Micropoint brass footers
    Three 20 amp circuits.

  16. #16
    Member
    Join Date
    May 2017
    Location
    Ohio, USA
    Posts
    96

    Re: X250.8 Fuse Blown?

    Quote Originally Posted by BlueFox View Post
    Is the amp plugged into an AC circuit also used by other gear? Or is it plugged into a dedicated AC line? If it is a dedicated line make sure the breaker hasn't tripped.
    The amp is plugged into an AC circuit used by other gear. That other gear is functioning normally. Also, I did check the breaker box and no breakers were tripped.
    Electronics: Pass Labs XP-22, Pass Labs X250.8
    Digital: OPPO UDP-205, Auralic Aries G1, Bryston BDA-3
    Analog: U-turn Orbit Custom w/ Ortofon 2M Blue, iFi iPhono3
    Speakers: Janszen Carmelita, SVS SB13-Ultra
    Other: David Laboga Custom Audio/Shunyata/Audioquest cabling, Panamax power conditioner

  17. #17
    Member
    Join Date
    May 2017
    Location
    Ohio, USA
    Posts
    96

    Re: X250.8 Fuse Blown?

    So, I talked with Mark from Reno a few moments ago ...

    1) As I had suspected, the fuse holder *IS* on the rear of the chassis, between the IEC inlet and the on/off power switch.
    2) This fuse *IS* user serviceable with the extra fuse that was included in the package.
    3) The trick to removing the fuse holder is to use a small flat head screwdriver to pry open a little latch at the top of the holder and then use the screwdriver at the bottom of the fuse holder to begin to loosen the compartment. I was originally trying to just use the top latch to open it.

    Once I got the fuse holder compartment out, it was super easy to replace the fuse. I once again have a working amplifier.

    Also, I called Pass Labs to order some replacement fuses (since I am now fresh out) and they were nice enough to send me out a couple of new ones at no charge.

    I wanted to post the resolution here so that anyone else might benefit from my 24 hours of panic.
    Electronics: Pass Labs XP-22, Pass Labs X250.8
    Digital: OPPO UDP-205, Auralic Aries G1, Bryston BDA-3
    Analog: U-turn Orbit Custom w/ Ortofon 2M Blue, iFi iPhono3
    Speakers: Janszen Carmelita, SVS SB13-Ultra
    Other: David Laboga Custom Audio/Shunyata/Audioquest cabling, Panamax power conditioner

  18. #18
    Senior Member
    Join Date
    May 2013
    Location
    Silicon Valley
    Posts
    2,497

    Re: X250.8 Fuse Blown?

    Good news. I'm glad it worked out. Now I am wondering if I have fuses in my Pass gear.
    Bud

    Lumin X1 file player
    Sony XA-5400ES SACD
    Pass XP-22 pre, X600.5 amps
    Magico S5 MKII Mcast Rose speakers, SPOD spikes

    Shunyata Triton v3/Typhon QR for preamp, Denali 2000 (2) for amps
    Shunyata Sigma XLR analog ICs, Sigma speaker cables
    Shunyata Sigma HC (2), Sigma Analog, Sigma Digital, Z Anaconda (3) power cables

    Mapleshade Samson V.3 four shelf solid maple rack, Micropoint brass footers
    Three 20 amp circuits.

  19. #19
    Member
    Join Date
    May 2017
    Location
    Ohio, USA
    Posts
    96

    Re: X250.8 Fuse Blown?

    Based on the images posted on Pass' product website, it looks like there is a user serviceable fuse on the 150.8, 250.8, and 260.8. I don't see one for the 350.8 or 600.8.
    Electronics: Pass Labs XP-22, Pass Labs X250.8
    Digital: OPPO UDP-205, Auralic Aries G1, Bryston BDA-3
    Analog: U-turn Orbit Custom w/ Ortofon 2M Blue, iFi iPhono3
    Speakers: Janszen Carmelita, SVS SB13-Ultra
    Other: David Laboga Custom Audio/Shunyata/Audioquest cabling, Panamax power conditioner

AudioShark - The Best High End Audio Discussion forum.

AudioShark forum is a leading forum site for High End Audio Discussion, Stereo System Discussion, Home Theater System Discussion, Best Home Stereo System Discussion, Home Theater Installation Discussion etc.

The AudioShark forum was created for sharing the passion of high-end Audio. We have Audiophiles from all over the world participating and sharing their knowledge. From novice to experts, you will find a friendly environment for discussing about High End Audio, Stereo System, Home Theater System, Home Stereo System, Home Theater Installation, Amplifiers, Speakers, Subwoofers, Integrated System, Acoustic treatments & Digital Room Corrections and many more.

At AudioShark, we also have incorporated an exciting Marketplace where members can peruse terrific buys on used gear, as well as meet dealers and discuss the purchase of new gear.

We are as crazy about this hobby as you are! So come on in and join us! Audioshark.org the Friendliest Audio Forum!

Industry Participation Disclosure : The owner and administrator of Audioshark is the owner of Suncoast Audio LLC in Sarasota Florida. Suncoast Audio has a full brick and mortar presence in Sarasota with several great show rooms with many world class brands. More information can be found at http://www.suncoastaudio.com

Audioshark is a community of like minded individuals. Audioshark welcomes participation from all manufacturers and owners of all brands and products. It is our belief that online forums provide a community of like minded audiophiles and music lovers to encourage the growth of this wonderful hobby.

Sincerely,
The Audioshark.org Team

X250.8 Fuse Blown?

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •