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 Post subject: Opening an early 1970's Sony MR - 9300WA AM / FM Portable?
PostPosted: Feb Fri 23, 2018 1:43 pm 
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Hello, I have this wonderfully performing Sony portable set. :)

It has something small rattling around inside, the stereo LED or driver transistor for it is bad, and needs a new telescoping antenna. :(

I am absolutely baffled as to how to get it apart. :? I don't want to mess it up. It must be some snap-together case scheme. I have no idea.

Anyone here at ARF have knowledge about this? Your help would be much appreciated. - C - N - E -

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 Post subject: Re: Opening an early 1970's Sony MR - 9300WA AM / FM Portabl
PostPosted: Feb Fri 23, 2018 8:07 pm 
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I had a similar one back in the late 60s, was wood and had stereo expand. I thoroughly enjoyed listening to it.
If I remember you can remove the knobs and there are screws in the battery holder section, I don't remember if there are screws on the outside if the cabinet?

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 Post subject: Re: Opening an early 1970's Sony MR - 9300WA AM / FM Portabl
PostPosted: Feb Fri 23, 2018 11:13 pm 
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Radiosmoker, thanks for replying. I tried that before but will approach it again this way.

The only screws on the outside are antenna terminals marked "FM" and "Ground".

Also have you ever seen a telescoping whip antenna that will "break free" without damage when its limit of movement in any direction is exceeded? The antenna on this was very fragile and is now toast. I know full well it will happen again.
Thanks, - C - N - E -

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 Post subject: Re: Opening an early 1970's Sony MR - 9300WA AM / FM Portabl
PostPosted: Feb Sat 24, 2018 3:11 am 
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I have a very similar MR-9400W portable. There are 5 screws inset about 1 3/4" below the rear cover surface that need to be removed. Then lift the cover off from the bottom after removing the power cord cover. I can't imagine that your Sony would be much different than this.

Attachment:
Sony MR-9400W Cover Removal.jpg
Sony MR-9400W Cover Removal.jpg [ 237.04 KiB | Viewed 789 times ]


I'm not sure what you mean by the antenna breaking free at the limit of movement. The antenna base on my radio swivels 360 degrees. The antenna can be moved from horizontal to vertical to horizontal in the opposite direction limited only by its contact with the cabinet. Perhaps yours is of a different design.

Dave


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 Post subject: Re: Opening an early 1970's Sony MR - 9300WA AM / FM Portabl
PostPosted: Feb Sun 25, 2018 6:24 am 
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For that Model there are several styles of cabinets, I saw one with a slanted dial and on the back, it had two holes, one on each end . a lot of time you cannot see a screw head but its usually black so it's not easy to see. If you have holes in the back you may need a long small Phillips screwdriver. I may be wrong but I don't think most radios of that era had snap fittings but were post and screw.

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 Post subject: Re: Opening an early 1970's Sony MR - 9300WA AM / FM Portabl
PostPosted: Feb Mon 26, 2018 3:11 am 
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Tried opening the radio again. Removed the two screws in the battery compartment and checked all foilcals for hidden screws.
Nothing there.

Applied various ways of squeezing and flexing the case. No dice. The seam between the front and rear case sections is very tight. I'm not ready to force anything into it as it would undoubtedly cause damage.

There is one manuals website that may have the service manual but does not appear to be HTTPS addressed. So that's not going to happen unless they will deal by cashier's check or postal money order.

Well I am stumped but not willing to destroy this fine radio in order to learn the secret.

Still seeking information. And thanks for the help.

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 Post subject: Re: Opening an early 1970's Sony MR - 9300WA AM / FM Portabl
PostPosted: Feb Mon 26, 2018 12:36 pm 
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I looked at some pictures of your radio on line and it is, indeed, made with a completely different style cabinet back than my radio.

This site has a service manual for an MR-9300W (not "A") available for download priced at $8.

http://www.manuals-in-pdf.com/download- ... 24530.html

I've used this site in the past, paid with PayPal, and have experienced no problems. I found pictures of both versions of that model and the cabinet backs look the same.

Dave


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 Post subject: Re: Opening an early 1970's Sony MR - 9300WA AM / FM Portabl
PostPosted: Feb Mon 26, 2018 5:59 pm 
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I have an MR-9100W with screws on the rear cover but I noticed years ago when I had it apart both the left and right speaker grills came off quite easily during dis-assembly.

I'm wondering if the MR-9300 has snap-in speaker grills that pry off and reveal the cabinet screws.

Also- The Stereo indicator is a tiny incandescent lamp, NOT LED


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 Post subject: Re: Opening an early 1970's Sony MR - 9300WA AM / FM Portabl
PostPosted: Mar Wed 07, 2018 11:39 am 
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Rocco53 wrote:
I have an MR-9100W with screws on the rear cover but I noticed years ago when I had it apart both the left and right speaker grills came off quite easily during dis-assembly.

I'm wondering if the MR-9300 has snap-in speaker grills that pry off and reveal the cabinet screws.

Also- The Stereo indicator is a tiny incandescent lamp, NOT LED

Thanks, I will explore the speaker grille approach and post results.
Regards, C-N-E

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