VL-1000 Quadra power supply failure

Discussion in 'Amateur Radio Amplifiers' started by K7SWS, Feb 8, 2019.

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  1. K7SWS

    K7SWS Ham Member QRZ Page

    I let all the smoke out of my Quadra power supply at Christmas time and just got word back from Yaesu repair that it's not repairable.
    So I'm wondering if you could drive the rf deck with a blade server power supply?
  2. W9GB

    W9GB Ham Member QRZ Page

    Yaesu VL-1000 Quadra HF/6m Amplifier
    by Adam Farson, VA7OJ/AB4OJ (with internal photos)

    Inside the Yaesu VP-1000 cabinet is a 2.5 kVA switching power supply, cooled by two large muffin fans. These are visible at the rear. The mains circuit breaker is to the left of the fans.
    The VP-1000 delivers 48V DC at 50A when operated on 220V mains (reduced to 35V when the LOW key is pressed for 500W output).

    MAYBE. It will NOT be Plug-N-Play ... DIY skills required.
    Since the Yaesu Quadra used the Motorola MRF150 transistor, this means the internal DC supply has to provide ~48 to 50 VDC — PLUS additional DC Voltages (like +12 and +5 VDC) required for the Microprocessor Control Circuitry.
    This PSU also has to be able to downshift to 35VDC for the 500 Watt output option.

    Adam Farson documented a SMPS swap, a few months ago.
    Yaesu Quadra VP-1000 PSU : Retrofit of Meanwell SMPS (RSP-3000-48 and RT-65B)
    by Adam Farson, VA7OJ/AB4OJ
    13 September 2018
    Based on a 2015 collaboration with Dale Hankins KB5VE and Joe Torrey WD5Y,
    and concepts developed by Matt Erickson KK5DR

    You might want to talk to Bill Grassa, N4ATS who has worked on the Quadra,
    about Options, as well as fit with minimal hacking, etc.
    Last edited: Feb 8, 2019
    KD2ACO likes this.
  3. AA7QQ

    AA7QQ Ham Member QRZ Page

    I scored a good dual 60 amp supply a year ago on Ebay. I'll get out to the shed & get the model number tomorrow.

  4. K6BRN

    K6BRN XML Subscriber QRZ Page

    Just curious - what was the cause of the VL-1000 power supply failure? Any thoughts?

    Brian - K6BRN
  5. KD2AAC

    KD2AAC Ham Member QRZ Page

    I just went to turn my VL-1000 on and got nothing. No fans in the back, nothing. Flipped the circuit breaker hoping that might have been the problem. Still nothing. Any fuses inside that might blow?

    I am assuming the power supply is not coming on if the fans don't come on. This is not good.
  6. KA9JLM

    KA9JLM Ham Member QRZ Page

    I am sure there are. Why they blew is another story.

    I thought blade supplies were 24 Volt, Or are some 48 V ?
  7. WE4E

    WE4E Premium Subscriber QRZ Page

    A little late to the game, but the fix may be a relatively simple one.

    The VP-1000 has three 5.6 ohm resistors in it that limit inrush and in severe cases, will open. When that happens, it will show no signs of life. The repair is fairly invasive, but is not difficult.

    Really good instructions here.
    Last edited: Aug 20, 2019 at 3:34 AM

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