crwdns2934065:0crwdne2934065:0: 13
1
1
Purchased new in 1984 and has been in storage for the last five years. Thought I would hook it back up. Connected the speaker cables to the back of the unit, turned it on but no sound. FM tuning was on full strength signal, checked out all control settings, everything was as it should be. Anybody have and ideas why I'm not getting any sound out of the unit? Thanks !
crwdns2934109:0crwdne2934109:0
crwdns2934065:0crwdne2934065:0: 4,2crwdns2936485:0crwdne2936485:0
3
2
Lets look for the simple stuff first...
1) Check for a tape monitor switch and be sure that it is no engaged.
2) Check the tape out connectors for a signal (a signal should be present even with no output from the amp section.
3) Verify that there does not need to be a shorting plug from the pre-amp to the amp. Many (including myself) have been bitten by this one when one forgets that an EQ used to be in the mix...
If all of the above are OK, then we may need to open this unit up and take a look.
Let me know what you find and we'll continue from there. Also, if you can post a picture of the boards, that might help too.
Dan
crwdns2934105:0crwdne2934105:0
Thank you Dan for your detailed suggestions.
I've pretty much tried everything, and while it could be something simple (or maybe more than that), I have found a small family owned specialized stereo shop in Houston that advises they handle Mitsubishi products. Cost to bench check it is $ 30.00, which I consider to be a bargain, and hooking it up to an oscilloscope will pinpoint the exact problem.
Funny thing is we're got a ton of stereo shops in the area but most of them don't want to mess with something as 'trivial' as this; I think (and I can't really blame them) they are going after the high end big ticket home audio repair and home audio /video installation business.
Again, thanks!
I am not familiar with this exact model, so I don't know whether or not it uses AMP PACs for the output. These would be large ICs with pins on one side that are mounted to a heat sink. If it uses regular transistor outputs, the repair should be less than $120 or so including parts if the outputs are shorted.
I am currently having the same issues. I have done a thorough cleaning on both the chassis and the controls and it has played beautifully since doing so but just the other day I lost all sound, and I took the pencil eraser trick and lightly pressed on capacitors and nothing But when I touched the voltage amplifier, the PCB sound came back on and sounded great. I don’t know if any transistors or resistors are bad at this point I’m going to put two new film capacitors and a new PCB in it which is available for sale. They’re $76 so they’re not cheap but I really like this receiver and I’m going to try to bring it back to life. This whole 65 year-old out here in central Iowa isn’t giving up yet. Take care and have a great day..
crwdns2934105:0crwdne2934105:0
If pressing the board "resolves" the problem, than the issue is bad solder joints. Look at the connection side of the board for bad connections. This one should be easy. If any joints look like they have circles on them or are dull, resolder them and report back. -Dan
Hi @larry71644,
If it gives more trouble, here's the service manual that may help.
crwdns2936751:024crwdne2936751:0 0
crwdns2936753:07crwdne2936753:0 1
crwdns2936753:030crwdne2936753:0 19
crwdns2942667:0crwdne2942667:0 583
crwdns2944067:02crwdne2944067:0
Hi,
Is there any audio out from the headphones socket?
crwdns2934271:0crwdnd2934271:0 jayeff crwdne2934271:0
great question back to me. never thought about checking that; thanks! will try that tomorrow and really appreciate your comment...
crwdns2934271:0crwdnd2934271:0 george_parch crwdne2934271:0