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sx-727

  1. choadrocker

    SX-727 AWK-010 AF Board

    I’m in the middle of restoring a Pioneer SX-727 and could use a little help with the AWK-010 AF/preamp board. One thing I like to do before powering things back up is print out a clean schematic/board layout and go back through all my work with fresh eyes. Unfortunately, every copy of the...
  2. Carbsandcaps

    Pioneer sx-727 tuner woes.

    I’m working in restoring a pioneer sx-727 receiver. I’ve replaced every electrolytic capacitor in the receiver. When I’m finished I have very very low FM volume, AM seems fine. I took some liberties with the size of the capacitors. Replacing the .33uf with 1uf, ect. These were the notorious lite...
  3. C

    SX-727 Right Channel Drop - Ongoing Headace

    Problem – right channel drops off/out from preamp R out. Mains in great. Persistent problem still not corrected. SX-727 produced summer 1973 AF Unit (AWK-010) – from Service Manual ANP-059 Board label Obtained a year ago. Was a very clean unit, stored a long time. Initially switches and pots...
  4. TomSc

    SX-727 restoration question

    I'm finishing up a recap on a 727. I've replaced all the electrolytics on the PS, protect, and all audio boards. I also replaced the usual problem transistors while I was in there. I did not replace Q1 and Q3 (2SD313D) on the PS board - AWR-010. I don't have anything on hand to sub for those...
  5. tusntuk2

    Pioneer SX-727 Blown Internal Fuse - what can I do?

    Hello AK, thanks for looking in. I'm having trouble identifying the cause for blowing an internal 3A fuse (# 2) in a Pioneer SX-727. I have reviewed other threads here and made some changes to my unit, but the fuse blew again while on the DBT, so I'm stuck, now. Can't measure voltages if it...
    • tusntuk2
    • Thread
    • fuse blow pioneer power supply protection circuit sx-727 trimmers zener diode
    • Replies: 31
    • Forum: Pioneer Audio
  6. tusntuk2

    SX-727 blown fuse - please help identify parts

    Merry Christmas AK'ers! I could use a little help solving a blown fuse problem on a SX-727. This unit was my first recap project, done 4 years ago. Following AK threads I bravely dug into a SX-727 to recap it, but little did I know how hard/easy it was! I figured even if it blew up it could...
    • tusntuk2
    • Thread
    • awm-027-d blown fuse diode help identify internal fuse power supply protection circuit recap sx-727
    • Replies: 2
    • Forum: Pioneer Audio
  7. 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
  8. P

    SX-727 with failing left and right Channel at high outside temperatures

    Today I had my SX-727 outside on the patio and adjusting the Bias und DC Offset after some work on the Head Amp Unit W21-002 and the Protection Board AWM-027. After the adjustment I had a successful DBT-test. We had some high temperatures above 86 °F and the open unit was sitting in the bright...
  9. 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
  10. toymanmsp

    Pioneer SX-727 - Relay Issues

    Greetings everyone, I've run into an issue where the relay is not coming out of protection mode. Resources used for servicing 727 Have and use DBT Lot's of photo's DVM Transistor Tester Electronic Solder and Desolder Stations Original Service Manual Willingness to learn, I'm rather new at...
    • toymanmsp
    • Thread
    • head amp power supply board protection board protection relay sx-727
    • Replies: 76
    • Forum: Pioneer Audio
  11. B

    Pioneer SX-727 Left ch/pin3 on protect bd DC offset fluctuating.

    Hi guys. New to audiokarma. Been looking at a lot of your threads on pioneer SX 727 they are helping out a lot. Just bought pioneer SX 727. Recapped everything except for I still have to order three main power supply caps. My problem as mentioned in the topic. Before and after recapping. The DC...
  12. C

    SX-727 re-cap

    I have a SX-727 that I've owned for around ten years, for the last 6 or so it has been in storage but I've recently set it up again. I've been having some problems with the left channel, sometimes it will work for a short time when I turn on the unit, other times it will be extremely quiet (only...
  13. Christa

    SX-727: Mostly done, what next? Bias, Filter Caps, Relay

    First off - Thank you so much to everyone that helped me along the way. Even if you didn't directly answer one of my threads I have learned so much from reading past threads and everyone has been incredibly helpful and generous with their time. I really do appreciate it. So, I've got the...
  14. Christa

    SX-727 Saga & Recap Advice - Replace all transistors, diodes too?

    Hi all! I'm working on recapping a receiver and its my first complete refurb project. I'm a complete novice - prior to this I've repaired an a faulty phono input SX-525 by replacing a few transistors, replaced the lamps and cleaned the pots, but that's about it. I actually started on this...
  15. 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
  16. mykidsbutler

    SX-727 power amp transistor substitute

    Looking for a substitute for a 2SC627 at q5 q6. Manual list q5 q6 as a 2SC1124 which is not what i have, board awh-011. Recommendations would be greatly appreciated.
  17. H

    Pioneer SX-727 speaker selector switch

    I have looked all over online for the power/speaker selector switch for the Pioneer SX-727 receiver, but no site seems to have it available, including Pioneer. The part number should be ASA-027. Does anyone know of any other parts that may work in its place from another Pioneer receiver...
  18. Super Noob

    Project: SX-727

    The sickness continues... picked a SX 727 last week for not much for much fun. My goal is to gift to a friend - pass on the love. The offset was a touch off in one channel. drifting around. So I started with the power supply board... full recap & all transistors. Before: After...
  19. phishterr

    Pioneer sx 727 tuning needle light??

    I recently picked up an sx-727 and it just dawned on me that the little light on the tuning needle is out. Haven’t been able to find any info on how to fix it, so here I am. Anyone?
    • phishterr
    • Thread
    • pioneer receiver advice repair help sx-727 tuner features
    • Replies: 4
    • Forum: Pioneer Audio
  20. dlucy

    Silver-face era Pioneer SX-x2x and SX-x3x receivers with gold or bronze face

    I've seen several comments about "gold" or "bronze" colored Pioneer SX receivers from the "silver-face" era. I've collected quite a few SX-424, SX-525, SX-626, SX-727 and SX-636 units over the last six months (refurbishing them to compare to my HK 330B's and pick the one I like best, then sell...
    • dlucy
    • Thread
    • gold tone pioneer pioneer sx silver-face sx sx-424 sx-525 sx-626 sx-636 sx-727
    • Replies: 22
    • Forum: Pioneer Audio
  21. tusntuk2

    How do you set bias or dc offset in SX-727?

    Hello the the Pioneer group! I'm a recent old member, just reintroduced myself from Arkansas. I successfully repaired a NAD with fellow AK er's help, and it inspired me to recap a SX-727 - wow! I'm stunned by the clarity, it's like, um, retirement, you know? There's this big build-up to it...
  22. Classic Pioneer

    Classic Pioneer

    SX-980, SX-3000, SX-6000, SX-727. The Yamaha RX-730 controls all the Pioneer receivers. Gotta have the remote capabilities. HPM 100's modified. S-510. S-910 with rebuild woofers and ESS Model 10 Tweeters. Keeping an eye out for the originals
    • PioneerHPMLuver
    • Media item
    • pioneer hpm-100 pioneer s-510 pioneer s-910 sx-3000 sx-6000 sx-727 sx-980 yamaha rx-730
    • Comments: 1
    • Category: Member's System Pics
  23. A

    Static / No Audio from Pioneer SX-727

    Hello! I am new to AudioKarma, and relatively new to vintage audio equipment, so I would appreciate any insight you all might be able to offer. I have a problem with static and popping / no audio in my system. I've isolated the problem to the receiver, which is a Pioneer SX-727. The receiver...
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