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idle current

  1. C

    Yet another Pioneer A-80 with a problem: distortion in left channel, bias is stuck at 0.00 mV

    Hello forum, I have recently acquired a Pioneer A-80 and the owner told me that one channel is "weak". After cleaning the controls, I managed to get sound from both channels while using the headphones. However, if I connect speakers, the sounds on the left channel gets distorted both in...
    • chiahead
    • Thread
    • distorion in one channel idle current pioneer a-80
    • Replies: 11
    • Forum: Pioneer Audio
  2. T

    Help Please - JVC RX-709V AV Surround Receiver Service Manual

    Hello, Would anyone have access, or could point me to a copy, of the JVC RX-709V AV Surround Receiver Service Manual and/or documentation, for only the offset voltage and idle current validations? Hifi Engine, is down for several days now, with the following message when a download is attempted...
  3. ZeRask

    Yamaha A-1 high voltages

    Hello, AK’ers I hope some Yamaha A-1 experts here can help me troubleshoot a weird voltage issue with my receiver. I attempted a recap/servicing on my A-1, which went well until the Electrolytics board, which was supposed to be the last one. I studied everything related to the subject on AK...
    • ZeRask
    • Thread
    • dc offset idle current recap and restoration voltage yamaha a-1
    • Replies: 65
    • Forum: Yamaha
  4. S

    Nad 3020 service manual

    Hi everyone! I have nad 3020 series 20 150W version (capacitors are behind motorola transistors). I can't find exactly service manual for this version, i really need adjust idle current after recap. All service manuals say's i need to solder 1k resistor with R653 and R654. Than i need cennect...
  5. Siraudio85

    Kenwood KA-7002 Idle current Adjust Proceedure

    Hello everyone, I have been struggling with my KA-7002's Idle current adjustment. Unfortunately the service manual isn't so clear. So far I have: Connected 2 dummy loads of 80ohms each to each channel on speaker terminals. Connected a 1 Khz signal through aux port. (Manual says main but if I do...
  6. Willarado

    NAD 3020 Series 20 (late) idle current questions

    Hi, I'm a new member and just completed my first recap of an NAD 3020 that I bought new in 1982. This is a later version with the large caps in the center of board behind the heat sink. The recap seems to have gone well and startup and other noises have all disappeared. The amp sounds great...
  7. B

    Pioneer Sx-1280 Idle Current Question

    Hello everyone! I am happy to be a part of such an awesome and knowledgeable forum! I'm having an issue with my 1280 that I hope someone can help point me in the right direction. I purchased this 1280 from a yard sale a few weeks back. The previous owner told me he bought it broken, and hoped to...
  8. G

    CR-450 idle adjust

    Hi Everyone, I am trying to set the idle current on a Cr-450. 50 mV on left and right channel as per service manual. However I can only set it on the right channel. Right channel is ok at 50 mV. Turning the trimpot on the left channel changes nothing, it stays steady at 0 mV. What could be the...
    • gjcr5121
    • Thread
    • cr-450 cr450 idle adjust idle current
    • Replies: 3
    • Forum: Yamaha
  9. D

    NAD Idling Current C326BEE

    Well, not sure if you would believe me, maybe I'm simply deluded. A problem with the NAD C326BEE amplifier. The sound - flawless, but the heatsink is too hot - about 70 C. One of the channels has too high quiescent current. Normal for a while on power-up, then after about a minute rises sharply...
    • Darek1048
    • Thread
    • c326bee hot radiator idle current nad
    • Replies: 37
    • Forum: Solid State
  10. M

    Marantz PM7200 Can't adjust Idle Current and DC Offset

    Thanks for reading me: After i repaired the speaker protection board of that amplifier, all was ok. So I then proceeded to adjust iddle current, got it, then DC offset. Oh, bboy. At that stage, on the left channel, after first seeing normal readings while moving the trimpot to get to the...
  11. Ray122

    Lafayette LR-1515 Idle Current Adjustment

    Hey everyone! Just finished recapping and cleaning up a Lafayette LR-1515 and it sounds great, but the heat sync gets really hot. Like too hot to touch. My guess is the idle current is way too high after re-capping the unit. Usually, this isn't a big deal for me if I have the service manual...
    • Ray122
    • Thread
    • adjust idle current bias bias adjustement diy help idle current idle current test point lafayette lr-1515 lr-2020
    • Replies: 5
    • Forum: DIY
  12. H

    Yamaha CR-1020 idling current not adjusting

    Hi, On a Yamaha CR-1020 I’m having trouble getting the idling current to adjust to anywhere near 10mV. Left channel: 100.4mV Right channel: 0 mV Following Merrylander’s advice (see below) I’ve replaced both 2SA844 transistors that sit just under the variable resistor. I’ve also replaced both...
    • Hifibythekg
    • Thread
    • amplifier board idle current merrylander power supply board yamaha cr-1020
    • Replies: 140
    • Forum: Solid State
  13. amr2

    Yamaha PC2602 / PC1602 isle current

    This adjustment is missing in the service manual, and the idling current was unknown....until now. Thanks to AKer @Serg111 :beerchug: PD: sorry for the typo in the title :( I can not edit it.
    • amr2
    • Thread
    • idle current pc1602 pc2602
    • Replies: 2
    • Forum: Yamaha
  14. QSilver

    Pioneer A-9 Biasing instructions wrong?

    I'm going through the procedures for setting this bias on an A-9 and having some trouble. Some history: I got it as a non working piece some months back and found it had many poor repairs in the all the regulator boards. I've now been right through the whole amplifier and slowly and surely...
  15. Ray122

    Pioneer SX-950 HELP!!!

    Hey everyone! In desperate need of some help here. I'm working on an SX950 for a friend, and for the life of me, I can't seem to keep the output transistors on the right channel from frying. I've gone through this a few times now and it's getting very frustrating. I had everything working just...
    • Ray122
    • Thread
    • amp bias bias adjustement counterfeit diy help idle current output transistors pioneeer repair sx950
    • Replies: 17
    • Forum: Pioneer Audio
  16. Z

    KR-710 extremley weak right channel idle current

    Hello all, I have a Kenwood KR-710 that has an extremely low output on the right side in regards to the idle current. The service manual says the Idle Current should be 30mV for the right channel, but I am only getting -.10 to -.15mV which is incredibly low. I tested all transistors out of...
  17. RogerMod

    Burning Amp 2018, Fort Mason, CA

    We had a nice turnout this October in San Francisco. Thanks to all the DIYers who brought their work to show off. Thanks to Linear Systems, makers of really low noise FETs and other SS devices, for hosting the event. Here is a link to their site. All the presentations can be seen there. See...
    • RogerMod
    • Thread
    • bias class a class ab idle current power output tubes
    • Replies: 5
    • Forum: Tube Audio
  18. RogerMod

    When we bias a tube amp what are we measuring?

    There seems to be some confusion about biasing a tube amplifer. I would like to ask the readers here to give their thought on what are we adjusting and what are we measuring when we adjust a tube amplifer's bias. If one were discussing his amplifier with another person what would be the...
    • RogerMod
    • Thread
    • bias bias voltage bias voltage at zero idle current tube amps
    • Replies: 93
    • Forum: Tube Audio
  19. Johnny_Law

    9090 Static / Current at Idle into Protection SOLVED

    EDIT: Solution was to replace TR01-TR04 (2SC1708) on driver board with KSC1845. Each measured OK using multimeter but would heat up during operation and introduce much noise into the signal path. After extensive searching and not finding this exact issue ... here goes. I have a 9090 that goes...
  20. camgilbert

    SA-7800 Idle current one channel 400mv

    Hello all, Iv'e just started working on a Pioneer SA-7800 which I acquired. Generally the unit is very clean and fires up ok. I did need to replace the power lamp but that's about it so far. When checking the idle current as per the service manual I started with the right channel which I...
  21. T

    Question about Optonica receiver idle current

    I was helping my buddy clean up and adust the DC offset and idle current on his Optonica SA-5606. We set the DC offset first and that was fine. When setting the idle current, our goal was 10mv between two test points. The left channel had zero voltage between the test points, regardless of where...
  22. dlucy

    Recapping, Rebuilding, Restoring, Rest-o-modding... a Pioneer SX-450 receiver

    Well, AK'ers, I owe many of you a big round of thanks. I've finished my first complete restoration, it was a SX-450, and most of what I did was a result of you all asking each other questions, answering them, and leaving pointers to more info. You guys rock! Thank you! It sounds terrific (with...
    • dlucy
    • Thread
    • idle current pioneer recap recapping restore silver face snubber sx sx-450 trimmer
    • Replies: 53
    • Forum: Pioneer Audio
  23. QSilver

    QM-800 Help

    I got this today to add to my quadraphonic collection and to maybe try bi-amping some speakers. Everything looks reasonable inside although someone has sabotaged the front speaker outputs. I powered it up and I've been trying to set the offset and idle current but I'm have problems.... I cant...
    • QSilver
    • Thread
    • idle current offset pioneer power amp qm-800 quadraphonic quadrophonic vintage
    • Replies: 46
    • Forum: Pioneer Audio
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