repair advice help needed

Greetings all, I am in the process of repairing and restoring an SAE 2500 Pre-Drive Board. In taking out the screws to the hear sink, one of the copper rings separated from the pcb (see !MG_1070). It is the bottom screw hole in the photograph and is the bottom hole of the q4 transistor. In...

I can usually muddle my way through board repairs but this one still has me stumped. It is with the right channel power amplifier board for a Yamaha R-1000 receiver. It came with a blown left channel Sanken 2SA1169 which I replaced with a NTE93 (in OEM packaging from a reputable US based...

I have an M-90a imported from Japan that looks like it's spent time in a river with how corroded it is, I got it for cheap so it is what it is, but I'd like to see if I can't fix it. The unit powers on but immediately enters protection mode. I have a step down transformer I'm using to power it...

Any advice on how to fix this damage or am I just screwed? I've got photos from before it was shipped and it was mint. I'm genuinely gutted. I imagine it's a veneer, but I also imagine finding a replacement veneer would be borderline impossible. Not to mention the fact I'd probably need to use...

I picked up a pair of Audyssey Lower East Side desktop speakers a year ago for $40 or so. They're unexpectedly good for their size and the price. Unfortunately, they stopped working a little while ago, and I would love any suggestions on troubleshooting. Here are the facts: They do power on...

Hey! I’m currently restoring a Monarch SAT-260X integrated amplifier and I’m trying to track down the service manual / schematic as well as the user manual. I’ve searched around but haven’t had any luck finding them elsewhere. I believe they’re available on HiFi Engine, though registration seems...

Hey all, New to the forum. Thanks in advance. I’ve been using and enjoying a Kyocera PL-601 I got from a friend since this summer. New belt, cartridge, etc. It’s been great up until a few weeks ago where the motor began slowing down and eventually comes to a complete stop. I’ve tried all...

Around six months ago, my KA-405 started exhibiting some weird behavior. While turning the volume knob, the left channel would sometimes randomly jump up to almost full volume before dropping back down to the expected level. I assumed this was probably just a dirty pot issue. Since the top of...

Hello everyone, I'm currently working on a Yamaha CR-620 receiver I found at my local thrift store. I have cleaned it, changed the light bulbs, replaced the tuning dial cord, and cleaned the knobs with Deoxit. It sounds great with my CD player, Cassette Deck, and 8-track player; the only...

Hello I have a Teac F200 Cassette Tape Deck I got for free and would like to use it. The belt had turned to goo. This post helped start me on my way... Teac F-200 Cassette Deck after watching a few videos (unfortunately the one with the clearest info last after I messed up) I do have a the belt...

Hi everyone, I found a pair of LS3/5A’s in my workshop that someone gifted me years ago. I had no idea what I was sitting on till recently. After giving them a wipe down and plugging them in I have discovered one of the speakers (so12882B) is very quiet. I opened it up to take a look and found...

Hello, I’ve recently bought a Yamaha CR-1020 with two problems with the AM/FM dial. The dial moves from the left to the right, up until the center and then stops moving. And the second problem which doesn’t bother me too much is that the tuner knob is hard to move. I hope someone can help me...

Hi all, as the title says, I have a couple small but annoying problems with this rare quadraphonic receiver. I think I know what the issues are but this is my first time trying to track down and rectify such problems. I'd like some guidance on where to look for my problems and what to replace...

Working on a pioneer quad for about ever now. Recapped and replaced transistors on the power supply board. Did not replace any resistors or diodes. Attached a pic of readings I’m getting compared to spec. Of by almost exactly half at pin 23, by 30% at pin 17. I don’t understand yet how to...

Dreaded EBay experience purchasing a PL-560. Seller shipped it in an Amazon box with loose packing material and nothing secured. Tone arm broke off, counter weight off, stylus broke, tone arm holder broken. Is it worth fixing? Any good resources on how to fix?

Hi All, I am in need of a well regarded and trusted service engineer for some older high end amps. Based in the UK. Specifically; Mark Levinson 33h, 334 & 27.5 ECS EA-2 Currently the ECS is the only amplifier which actually needs repair - dropping out on one channel. God help me when the...

Hi, this is my first post to this forum and I know very little about record players. I purchased a dual 601 refurbished a year ago, and the speed selector has always acted up, specifically switching it from 45 to 33. When I switch the speed back from 45 to 33 the belt gets stuck in the middle...

Hey guys! So, i got myself quite a task. Purchased a Burmester 933 amp, stated as defect, "doesn't function since some time, LED doesn't turn on". Price was good, so why not, let's give it a try. Came home, opened it up and discovered with great horror/surprise that 2 caps were missing on one...

So this amp finally burned up one of the output transistors on the left channel and since it has been repaired at least 5 times in the last 2-3 years by a 3rd party with who knows what quality replacements we decided to just buy the parts ourselves and change all 4 output transistors and all 4...

Purchased a hobby homemade set of monoblock amp a few months ago in Japan. Unfortunately one of the amps stopped working. Tried to swap tubes, cables, speakers - nothing. When I moved the amp from the shelf, I noticed an oily residue below it. I took a look at the inside amp and found what...

Hi everyone I am trying to repair/restore a Marantz 1090. My name is Diego, I am from Switzerland, and have some experience in electrical engineering. But I am a total noob when it comes to Hi-Fi audio and to repairing vintage audio electronics. A few month ago my niece wished to get a...

Hi all, I recently inherited a Marantz 7C. After being assured it worked, I foolishly went to turn it on and the light on the front won’t turn on and doesn’t seem to work. Here are the internals/externals. Would anybody know of a place I can go in San Francisco (or the Bay Area generally) to...

Hello, I'm trying to troubleshoot this subwoofer, that doesn't turn on. What I have done: Opened it and checked for bulging caps: there were none Desoldered the power board (it really isn't a power board: it just switches on and off the mains) Checked a cap there (desoldered, so I could test it...

Hello dwellers of the Marantz subforum. :) I am seeking knowledge about a Marantz 1150 (not the D model). This amp is a friends, and they asked me to take a look at it. I have a rudimentary knowledge of electronics (mainly tinkering with them for fun) and can solder confidently. A bit of...

Hello! Today I picked up a Kyocera R-851 as part of a lot of audio gear, and I’d like to get it up and running. The guy mentioned that the unit “doesn’t power on, but smokes when you hit the power switch”. Considering the rest of the lot was well worth my money, I figured it was worth a shot...