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zener diode

  1. J

    pioneer SX-440 Tuner Board Germanium diode

    Howdy all- I am restoring a Pioneer SX-440- nice little unit. All complete except for a question on the tuner board regarding the Germanium diode pictured in attachment. The board has W35-027A marked- it is not the same as the service manual schematic and my searches have not found any info...
  2. 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
  3. H

    Yamaha C4 - zener diode WZ130 - Power C Board

    Is the correct replacement for a WZ130 located at D503 and D504 on the Power C Board this? ONSEMI 1N4148TA Small Signal Diode, Single, 100 V, 200 mA, 1 V, 4 ns, 4 A https://uk.farnell.com/on-semiconductor/1n4148ta/diode-ultrafast-300ma-100v-do/dp/2322485?CMP=i-bf9f-00001000
    • Hifibythekg
    • Thread
    • c-4 preamp yamaha zener diode
    • Replies: 34
    • Forum: Yamaha
  4. david winter

    C-70: mistake around zeners near T211/T212 ?

    Hello, I am repairing a nice C-70 pre. Between T211 ant T212 (symetrical sub-power), are two 27V zener diodes (D126 / D127). The glue used to stick the two 220/35 capacitors corroded both zeners and one had a broken leg. No reference is visible on them, so I took the schematic and realized that...
    • david winter
    • Thread
    • c-70 preamplifier yamaha zener diode
    • Replies: 5
    • Forum: Yamaha
  5. ocdecio

    Model 3200 - Zener value

    The 17V zener on my 3200 power supply board is faulty. It is listed as WZ-177 (17V) and its replacement would be 1N5247B. It so happens that I have lots of 18V zeners 0.5w and I was wondering if the extra volt would create havoc in this model. I've seen cases like the 240 where it seems to be...
  6. Beavs

    Yamaha CR-2040 Shorted During DC/Bias/Voltage Adjustment

    Well, I'm pretty new to this and probably have no business digging into the likes of a CR-2040, but this is what I've found to pass the time and I'm enjoying every second of it. I picked this CR-2040 up for $200 knowing it was cosmetically great aside from being dirty and there was no sound out...
    • Beavs
    • Thread
    • capacitor electrolytic output transistor recap restoration transistor troubleshooting yamaha cr-2040 zener diode
    • Replies: 143
    • Forum: Yamaha
  7. duncan

    Denon POA 2200 repair/recap - some notes

    Nothing earth-shaking here but thought I'd post some pictures and notes for anyone who runs into a similar situation. I acquired a POA2200 power amp last year. The previous owner gave full disclosure that it seemed to have intermittent problems, but I couldn't make it misbehave. Actually the...
    • duncan
    • Thread
    • bias denon protection recap relay servo zener diode
    • Replies: 19
    • Forum: DIY
  8. Rebooted

    Kenwood KR-9050 Zener Replacement

    I have a Kenwood KR-9050 receiver with some bad components on the driver board. I've already found replacements for the transistors, but the diode, D5, is bad as well. The manual says it's a YZ-040B and I can't seem to find much more info than that. Can anyone recommend a replacement for it?
  9. K

    question about zener diodes

    I know a zener diode is basically like a voltage regulator, but does it have to be mounted a certain way? im replacing the zener on a luxman L-210 but the zener diode was already cut out when i opened it up , so i was wondering if these have a certain polarity or orientation to install. any help...
    • Kevin6860
    • Thread
    • luxman zener diode
    • Replies: 17
    • Forum: DIY
  10. R

    Protection for irreplaceable tweeters

    Hi folks- Long time reader, first time poster here. I am looking for some experienced advice on a subject I know has a lot of history. I have read all I can find but still have a dilemma. I have a pair of ultra rare speakers (Panasonic SB-636) with absolutely irreplaceable, very unusual...
    • resoundpdx
    • Thread
    • speaker protection tweeter protection zener diode
    • Replies: 27
    • Forum: Speakers
  11. Kecap Manis

    Need help: Diode replacement HZ12-A2, GP10D

    Hi All, I need help with replacement for older diode in a circa 1980s amplifier. A few of the diodes leg was badly corroded (one is broken upon cleaning) by glue from nearby elco. I'm hoping to find a similar spec new replacement. Hitachi/Renesas HZ12-A2 -AX in regulator section Possible...
  12. D

    Sansui AU-317 Restoration: Zener question

    Hello All, I'm actually doing a restoration of a AU-317 which is in a very good condition and never opened (it seems), performing a full recap, relay change, replace carbon for metal film resistors (including fuse resistor ones), pot cleaning and checking all broken/cold solder joints...
  13. ExcitableOne

    JVC R-X400 no output and LCD doing some weird things

    So I bought an untested JVC R-X400 on eBay kind of knowing this would happen. As of right now I'm getting no output, one of the fuse lamps is burnt out, but I know how to replace that. The spectrum analyzer is peaking at all but one frequency, and the display at that part I'm assuming displays...
  14. B

    Upgrading Vintage Marantz 1030 Power Supply to Zener Transistor

    Hi, First time poster. I've started cleaning up and recapping a Marantz 1030 as a summer project. It's going well. However, one of the things I'd like to do - due to its relative ease - is upgrade the power supply to a better level of regulation. To do this I'm going to replace the resistor to...
    • benhodgson
    • Thread
    • calculate marantz modification modifications power power supply transistor upgrade upgrades improvements zener diode
    • Replies: 23
    • Forum: DIY
  15. S

    diode replacment

    Hello guys! Could anyone recommend a descent replacment for an old toshiba diode tlr112? Thanks in advance ;] Cheers
    • spdf
    • Thread
    • zener diode
    • Replies: 11
    • Forum: DIY
  16. Aaron99

    Marantz 2238 won't power on.

    New to the forum. I just acquired a Marantz 2238 in decent cosmetic shape from a seller on CL. The seller told me that when he presses power button a few seconds later he hears a click and then nothing. The unit passed a DBT and then I plugged it in and powered on. Within 2 or 3 seconds...
    • Aaron99
    • Thread
    • 2238 marantz p800 power supply zener diode
    • Replies: 70
    • Forum: Marantz Audio
  17. P

    Nikko NR 1219 Repair! Loss of Right Channel, both channels work with Mono

    Hey guys I was hoping to get some help with a repair job. I just bought this receiver a month ago so I'm pretty bummed to be having issues already. As the title reads it is a NIkko NR 1219 and slowly over a day or two the right channel would go very quiet and be very distorted, Now it is...
    • Ponchobrown
    • Thread
    • nikko repair help resistors right channel out zener diode
    • Replies: 14
    • Forum: DIY
  18. QSilver

    Can't seem to find this Zener Diode....

    I'm working on an SA-606 that has been kind of abused... It has been running at the wrong voltage which I think lead to the larger transformer (for the class B power amplifier) to burn out. I've replaced it with a 300VA Toroid that just managed to squeeze in. Powering it back up, the amp...
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