schematic

Hello, I have a 1959/1960 Decca Allegheny IV that I am trying to find a legible schematic for. There is one glued to the inside that I cannot remove without ripping, and even if I did, the print is so small that I cannot read it. I have checked Sam’s photofact and it seems to skip over this...

Hello, I've currently got two receivers on my bench, one a late 60s Harman Kardon SR-300b, the other a Nikko QSR-4040 quadraphonic receiver. I an coming up dry on schematics for both. The H/K is faulty with bad hum and no tuner output. I've tried some troubleshooting but it's essentially...

I got a Garrard DD75 very cheap in non-working condition. I have made some repairs to get it working, although i will need to clean and adjust erratic speed controls. I got a User’s Guide with the unit, but I would like to get detailed schematic diagrams and have not found any by searching this...

(Long time lurker, first time poster...) I have a JVC QL-7 that I bought a few years back and have really enjoyed. Recently it stopped powering on. I dug into it and the power transformer's primary measures open. (Not sure why that would happen - we didn't have lightning or anything like that...

Dear Accuphase lovers, I was searching for it forever and then all of a sudden *poof* it was uploaded in high quality to Hifi Engine :banana: Complete service manual + schematic and adjustment info. Please beware that it is for units starting with serial number F4Y001 I tried to upload it...

Hi , I have a philips 7871 reciever that is wonderful. However, it started making loud buzzing noises and crash sounds. This happened regardless of the source. It also flashed the protection mode. I shut it down. I hqave a local tech in Maine, Kent Palmer, but he cannot find any schematics or...

Hello, I purchased a used Integrated Amp by Perreaux, the Audiant 80i. Unfortunately, I need to bring it to my local shop because the right side of the speaker output is not working. We have no official dealers in Canada and my region, so I was wondering if someone would have the schematics of...

This is the detail from the schematic of the Kenwood KA-3500 integrated amp, showing the loudness circuit. Front panel switch has three positions: treble filter, off, and loudness. After replacing the capacitors and a few transistors my amp is fine, except that when I switch the loudness on...

I need a schematic (or full service manual) for the Pilot 746 receiver (from 1962-1963). I believe a schematic for a Pilot 654, 654M or 654MA will also do, since I’m looking into the power supply and it is likely that all four of these receivers used the same-design power supply. I will be...

Hello, I am close to finish restoring a QR-6500 (serial is 211091683 if this can help with differences / mods). I need to verify the position of a strap (see picture below) on the solder side of the F-1322 decoder board. The service manual seems to have the right schematic (at least something...

I am working on a Carver PM-350. The only schematic I can find online is low res and hardly readable. Does any generous soul out there have a better schematic, and will share it with me? The board layout drawing would help too. A ledgeable trace side drawing would be great too. I want to fix...

The QL in my DQX-1000 is spinning the TT at 40 rpm. It's been working fine for well over 30 years since I first owned it. Months ago, the problem started but quickly returned to normal for weeks/months after one day. Now it's here to stay. I tried to locate the schematic for the QL circuitry...

Hi, I have been wondering what caused some low background noise on a 771 which I almost completely restored. Two electrolytics on the F-1504 preamp board (C17 and C18) apparently have incorrect polarities both on the schematic and the pcb silkscreen. They had -5V accross them. The 2SC1313 were...

Hey AK. Since 'Indy Audio Labs' decided to skip their legacy products on their webpage, where good information was available regarding older Mondial/Klipsch manufacturing, I thought this thread would be a good idea. Many schematics from Aragon and Acurus is no more available, and cannot be...

Some classic speakers are fabulously documented while many are shrouded in mystery. Which must frustrate hobbyists, judging by frequency these forums are peppered with unanswered requests seeking crossover data. Feeding my own curiosity about vintage Optimus and Nova products has unearthed...

Hi, I am recapping a Luxman R-1030 for a friend and have two small questions. There are elco's in a type of housing I have not seen in my previous recap projects: little blue elco's. Are they also to be replaced? (see picture) Second question: The schematics I have from this amp (from...

Hey guys, been looking around online and it seems that the manual scan doesn't have a complete schematic, and the schematic posted online is of low scan resolution. Is there a higher resolution scan of the schematic out there? I have one here where on phono 1 and 2 there's no audio, and it's...

Greetings - Does anyone know where I could find a Luxman T12 Tuner service manual. I have a schematic, but I can't seem to find the SM anywhere online. Help would be appreciated. Thanks.

I'm looking for a full schematic for my Counterpoint SA-100 power amp. There is a schematic posted online in various places that is partly in italian. My repair technician is in the process of troubleshooting my amp and that schematic is apparently not complete enough. Any thoughts?

Hello guys! Sorry to bother. I originally posted this question on the pioneer forum, but when I looked around the site more it became clear it would be better to post it here. I have been having trouble building a load box schematic from a pioneer manual. I'm gonna copy the original post I...

Hello guys! Sorry to bother again, but this time I am really confused about an electronic system. I have learned a lot about basic electronic components reading the pioneer tuning fork series, and by reacherching basic electronic theory online, but I cannot seem to solve this problem. On...

Does anyone have access to this, or a service manual? I called Polk, and they said they don't have it anymore. Of course, the first person I talked to asked me what a schematic was. Really. I hope they didn't find my laughter insulting.. it was spontaneous and unintentional. He was kind...

Hello Everyone, I am restoring a "Magnificent Magnavox" Stereo Console. I can't seem to find a schematic, parts list, amp photo identifying parts, etc. The only identifying marks for the console are in the attached photos. I would love to know the model number, the year, can't seem to find a...

I have Akai GX 600DB that is not erasing and recording. I want to start step by step with erasing the tape problem. Here is erase operation schematic: Here is the service manual pdf. First of all, I could not get any AC signal generated with the L3. Also, I have checked all of the...

I was facing a job involving rewiring of the 500C’s 7-position 5-section selector switch and realized I did not have near the understanding I needed to feel good starting. To help myself get there I put together 7 drawings to show the state of the network and signal path for each switch...