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awm-027

  1. P

    SX-727 Protection Relay AWM-027 with strange issue

    3 years ago, I did a major rebuild with Merlynskis help (RIP), but now the Relay on the AWM-027 protection unit has a lot of work with the protection job. After power is on, the dial light go on, signal and tuning needle move, but the protection relay won’t pull in. After some time and several...
  2. tusntuk2

    SX-727 Schematic changes for AWM-027 D Protection Board

    Holiday Greetings, AK'ers! My beloved Pioneer SX-727 blew an internal .5 fuse, so I checked it out. AK threads suggested the power supply or the protection circuit were common culprits. You might remember that the Protection Boards in the SX-727, and several other SX and SA series amps, are a...
    • tusntuk2
    • Thread
    • awm-027 awm-027d pioneer protection circuit sa-8100 sx-727
    • Replies: 0
    • Forum: Pioneer Audio
  3. P

    SX-727 Protection Unit AWM-027 and Fly-back diode

    I just solved an issue on the Protection Unit and would like to add a fly-back diode as well to that board like I have on the AWM-025. Would you recommend it as well and if yes, is this the correct position? 1N4004 as fly-back diode added between pins 14 (anode +) and 15 (cathode -)
    • pa_200
    • Thread
    • awm-027 fly-back protection sx-727
    • Replies: 3
    • Forum: Pioneer Audio
  4. P

    SX-727, flyback diode on protection board AWM-027

    Hello at all, I get the SX-727 from my daughter in the next weeks for a little renewal and plan to improve the protection board with a flyback diode. So far I didn’t find an answer for this board, but rechecked the known position on the AWM-025 schematik and compared it with the AWM-027. My...
    • pa_200
    • Thread
    • awm-027 flyback diode protection board sx-727
    • Replies: 5
    • Forum: Pioneer Audio
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