RM Italy BLA600 problem

Discussion in 'Amateur Radio Amplifiers' started by AB3LD, Jun 20, 2020.

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  1. AB3LD

    AB3LD Premium Subscriber QRZ Page

    Last time I used this amplifier it worked fine. Today it won't power up at all. No sound, no lights, nothing. It's set up for 115VAC power. The fuse is fine. The power cord reads 123V. Any ideas? Thanks.
  2. W1TRY

    W1TRY XML Subscriber QRZ Page

    I'm sure you checked the fuse for continuity, but you might try flipping it around or trying another fuse.
    Measure the ac at amplifier end of the power cord if you didn't already (sounds like you did.)
    I'm not familiar with the amp and didn't find any schematics or technical literature on line.
    Open it up and follow the AC path with your meter if you have the resources, skill and comfort level.
    Good luck, you'll figure it out.
  3. AB3LD

    AB3LD Premium Subscriber QRZ Page

    Thanks! Yes, I did check the AC at the amp end of the cord, and I did replace he fuse, even though the old one tested fine. I'm guessing something blew up in the power supply. Looks like I'll have to either dive in, or call in a pro. Maybe I'll flip a coin. 73
  4. AB3LD

    AB3LD Premium Subscriber QRZ Page

    Leaning toward asking a pro to look at it. DXE referred me to theirs, but he has a months-long backlog. Anybody know a good amp tech who might want to work on it for me?
  5. AB3LD

    AB3LD Premium Subscriber QRZ Page

    WA4SIX likes this.
  6. G0JTB

    G0JTB Ham Member QRZ Page

    Identical problem with mine. 4h to fix.
  7. AB3LD

    AB3LD Premium Subscriber QRZ Page

    You are faster than I am! Glad it worked out.
  8. AB3LD

    AB3LD Premium Subscriber QRZ Page

    OK now there is a new problem. After I replaced the thermistors, it worked fine for a while. But today it failed. It powers on fine, and runs through most of its usual self tests OK. But the fan test fails. The fans do not come on. The display shows an error "FAN BLOCKED. PRESS + TO CONTINUE." When I press +, the display says "ERR:". Then the amp is just stuck, set on 6 meters, and will not respond to any button press. The fans are not physically blocked and I can spin then freely with my finger. Any suggestions? Thanks! 73, Joe P, AB3LD
  9. WA1UIL

    WA1UIL Ham Member QRZ Page

    Since the amp" knows"a fan is blocked that would lead me to think there's a sensor or sail switch which proves airflow to the logic board. Or its checking fan speed thru the hall sensor in each fan. Did you unplug a fan(s) while working on it? Try re seating the fan connector and make sure a wire isn't getting in the fan blade when re assembled. Just my $.02

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