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 Post subject: need schematic Chrysler Solid State model 388
PostPosted: Mar Mon 06, 2017 1:33 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 105
Location: Tucson, AZ
Hello All:
It's been awhile since I've had a car radio come across the bench. It is a Chrysler solid state from a 1968 Coronet. Model is 388, 'mark B1'.
AM plays, but has HUM in the audio. FM is VERY WEAK.
Any assistance is appreciated. Take care, Bill


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 Post subject: Re: need schematic Chrysler Solid State model 388
PostPosted: Mar Mon 06, 2017 1:45 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 23934
Location: SoCal, 91387
The set is almost 50 years old. I would think a recap would be the first priority, in potentially curing both of those issues. You don't need a print for that.

_________________
\\\\\\\\\\\\\\\\\\\\\\\\He Who Dies With The Most Radios Wins//////////////////


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 Post subject: Re: need schematic Chrysler Solid State model 388
PostPosted: Mar Mon 06, 2017 2:44 am 
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Joined: Jan Tue 31, 2012 1:55 am
Posts: 1841
Location: Mountains of Mourne. Ireland.
Richard is correct, replace the electrolytic capacitors and see how you get on!
If you need schematics see below.

Dodge 1968 Coronet, Charger
AM-FM PB radio 12V
MoPar 388 Bendix 8FBCO
https://sites.google.com/site/identifyi ... -1/dodge-2

SAMS PHOTOFACT Auto Radio Series Manual AR-58 January 1969 ($11.99 + $4.00 shipping, open to offers) includes Dodge Coronet (1968) model 388
http://www.ebay.co.uk/itm/Vintage-SAMS- ... D#shpCntId


Photofact Auto Radio Series service manual (15 pages) for the 1968 and 1969 Plymouth and Dodge models. Includes Mopar 388 (8FBCO) $19.99
http://www.ebay.com/itm/1968-1969-PLYMO ... 2257121149?


Greg.


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 Post subject: Re: need schematic Chrysler Solid State model 388
PostPosted: Mar Mon 06, 2017 3:29 am 
Member

Joined: Jan Thu 01, 1970 1:00 am
Posts: 105
Location: Tucson, AZ
Thanks for the Ebay links.

The owner of the radio is undecided if he wants to fix, or have the internals pulled out and a 'upgraded' Bluetooth USB receiver installed into the case.

If I could at least get some transistor bias voltages and determine a 'estimate' to bring it back to life before I spend too much time on it was my plan.

For now, I'll tell him it's a minimum of $20 for the schematic. If he buys the schematic I'll spend more bench time on the radio.

Take care, Bill


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 Post subject: Re: need schematic Chrysler Solid State model 388
PostPosted: Mar Mon 06, 2017 7:12 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 1529
Location: Shelton, WA
Hi Bill;

Since the radio is playing and you get a hum most likely the filter capacitor replacement as mentioned would solve the problem(s). You would not need a schematic to replace them and probably cost would be inexpensive. You can tack in replacements since they are not shorted to determine if indeed they are the problem.

However if he is looking to upgrade to bluetooth it would be necessary to send it out to a dealer such as myself to have the boards installed as they are not sold. Appearance and fit remain unchanged for the conversion.

You can look this over from Aurora Design: http://tech-retro.com/Aurora_Design/FMR.html; http://tech-retro.com/Aurora_Design/BT.html to get an idea what's available.

Please feel free to contact me for additional information.

billn


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 Post subject: Re: need schematic Chrysler Solid State model 388
PostPosted: Mar Tue 07, 2017 2:25 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 2229
Location: Lakewood, California
Bill,

The hum may also be from your power supply. Solid state car radios need a fairly good DC supply to be free of hum.

I have the 26 page Bendix manual scanned that covers the Mopar 388. Send me a PM with your email address for a PDF zip file of the manual.

_________________
Meade


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 Post subject: Re: need schematic Chrysler Solid State model 388
PostPosted: Mar Tue 07, 2017 3:01 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 105
Location: Tucson, AZ
Thanks, Meade. You have come through for me before!
I know what you are saying about the power supply HUM, but my bench supply is a super clean Hewlett Packard unit from the late 1970s.
I'll PM you tonight. Take care, Bill


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