1. You can now help support WorldwideDX when you shop on Amazon at no additional cost to you! Simply follow this Shop on Amazon link first and a portion of any purchase is sent to WorldwideDX to help with site costs.
    Dismiss Notice

yaesu ft 101b clarifier not working

Discussion in 'Forum Help & Info' started by Desperado505, Dec 9, 2018.

  1. Desperado505

    Desperado505 New Member

    Joined:
    Aug 10, 2018
    Messages:
    4
    Likes Received:
    0
    Hopefully someone can help me out here....I have a 101b and the clarifier doesnt work. The light comes on but doesnt do anything after that. Ive been tracing schematics, surfing for clues on the net and been through the service manaul many times trying to figure this out. I cant adjust the transmit/receive frequency without the clarifier working. Ive just been using it as a receiver. The green wire going into the vfo has 6 volts same as the blue one next to it which shouldnt be i believe. The green wire should be reading around 3.50 vdc give or take a few. I have recapped the electrolytics on the regulator board(pb1314a), and the audio unit (pb1315). The radio receives great and transmits ok just not on the same frequency. Ive tried adjusting the pots that are shown on different videos and explained in the service manual but without the clarifier working at all and 6 volts to start with i cant do it. On the rectifier board where it should be -100 volts its -173 volts. If anyone has any ideas on what components to check or where to look that would be great because i really like this radio.


     

  2. nomadradio

    nomadradio Analog Retentive

    Joined:
    Apr 3, 2005
    Messages:
    2,066
    Likes Received:
    1,530
    Hmmm.

    The 101B schemo PDF I have from Fox-Tango has a big gap right where the clarifier circuit should be.

    I'm sure we have a paper copy here that's complete.

    Just gotta find it.

    I'll look for it.

    73
     
  3. Desperado505

    Desperado505 New Member

    Joined:
    Aug 10, 2018
    Messages:
    4
    Likes Received:
    0
     
  4. Desperado505

    Desperado505 New Member

    Joined:
    Aug 10, 2018
    Messages:
    4
    Likes Received:
    0
    Thanks for looking ill be checking back to see if anyone has any ideas.
     
  5. kopcicle

    kopcicle Sr. Member

    Joined:
    Feb 17, 2016
    Messages:
    693
    Likes Received:
    685
    I believe this is the late "B"
    FT-101B - "Early" Model
    Serial numbers below 6,000.
    Improved IF (PB1183B) and Audio (PB1315), and Blanker (PB1292) boards.
    160-10 meter transceiver.
    101B2_clarifier.png FT-101B - "Late" Model
    Serial numbers 6,001 and up.
    Improved Regulator (PB1314A), IF (PB1180B), and Audio (PB1315A) boards.
    160-10 meter transceiver.
    In any case it's all the "B" info I have. Never seen one with the covers off.
     

    Attached Files:

  6. Desperado505

    Desperado505 New Member

    Joined:
    Aug 10, 2018
    Messages:
    4
    Likes Received:
    0
    I appreciate the effort but I have the schematic and have been going over it for a couple months now. I think I will have to test some components in the vfo area but it’s very tight in there to do anything. There’s a diode in there that I couldn’t quite get my probes on to get a good reading so I’ll have to try harder to get in there.
     

Share This Page

  • About Us

    The WorldwideDX Radio Forum was originally established in 2001. We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. We are working every day to make sure our community is the best Radio Hobbyist's site.
  • Like us on Facebook

  • Premium VIP Member

    The management works very hard to make sure the community is running the best software, best designs, and all the other bells and whistles. Care to buy us a beer? We'd really appreciate it!

    Donate to us!