My JVC RV-B90 Boombox was plugged in and working great, now it will not power on. I checked the fuses and all are ok. What else could it be? How can I check the power supply to determine if it is the problem?

jvc does not sell it. so only used parts now. ask them ?
and using ebay ,you might get lucky
it is not a computer. (it's a BOOM box stereo noise maker)

JVC re-invents portable stereos with the RV-B90GY Kaboom. It's the highest power portable
stereo ever offered;
or goggle the while earth for it.
battery cover
JVC RV-B90GY we sell no parts here, all we can do is point to the obvious.

1. google
2. ebay
3. ask maker.

Hello
Casette tape can be reeled to the capstan shaft and jammed. It is a tricky way to get it out. Only an experienced service technician can do this work. If you try to pull the casette hold tray out by force, it will get broken, and will turn irreparable. OK.

If you can believe what they say about the specs...

Register and download the manual for free at retrevo.com

http://www.retrevo.com/support/JVC-RV-B90GYJ-manual/id/316ag201/t/2/

Bear in mind the power spec is at >>>> 10% <<<< THD without any bandwidht specified. THAT's a lot of distortion stated in a meaningless fashion to convince you to part with the money.

If one looks at the power CONSUMPTION figure (43 watts), one can conclude that the audio power spec is totally fabricated. NO device puts out more power than it consumes.

That is not to say it won't sound good and loud in certain settings and conditions, but this is not, say, a Bose Acoustic Wave Music System. After a certain volume demand it will just be annoying instead of entertaining. That's why they called this class of product a Ghetto Blaster.

I see one sold for $70 last year...

http://www.propertyroom.com/ItemDetails.aspx?l=7334900

http://cgi.ebay.co.uk/JVC-RV-B90-Boombox-/120719242489

http://www.dvdremotecontrols.com/Mfrs/device_files.php?pageNum_modl=2&totalRows_modl=577&brand=JVC&dt=AUDIO

or Amazon

http://www.searspartsdirect.com/partsdirect/part-number/Jvc-Parts/Audio-equipment-Parts/QZW0152-001/0057/528/Model-RVB90LTD/1758/0313000?keySuffixId=NA&productTypeId=x&searchModelNumber=RVB90LTD&subCompDesc=Cabinet%20parts&brandDesc=JVC&modelDesc=POWERED-SUBWOOFER-CD-SYSTEM&blt=11

hi i know it a bit late but wated you to know. to find service manual(has schamatics) google your model (JVC RV-B70 service manual) dont pay for one as i found on for free on hifimanuals.com i think. google is your friend. good luck

yes a little groove under to big batteries. AA i think

Good luck, JVC will only sell pieces not the whole player... just went through it

check their website and if they show this item and they will tell you where to get it or do a google search for this item.

You need to resurface the contacts. Here's how you do it:
First, disassemble the remote. Clean the black foil pads on the circuit board with rubbing alcohol. Now take a #2 pencil and a razor and shave the graphite from the "lead" onto a piece of paper (hold the blade perpendicular to the lead, this results in a finer powder). Now that you have a nice pile of powdered graphite, blot a Q-Tip into it to saturate the cotton with graphite. Rub the graphite onto the little black pads on the rubber button membrane, and be sure to apply more graphite to the Q-Tip every 2 to 3 buttons. Blow off any excess graphite. reassemble remote and test.