marantz 4270 repair

Posted by  in Tuesday, January 5th 2010   
Topics: Pro Audio    
HAL4400 asked:


i’ve made a video of the marantz 4270 receiver.

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16 Comments

reptar1994 said in January 8th, 2010 at 4:59 pm    

Cool :D thanks man

Watcher3223 said in January 11th, 2010 at 9:58 pm    

“LOOK at the purple capacitors … they kill your amplifiers”

Tell me about it!

I just got through repairing someone’s old 1977 era MCS Series amp. Every single purple Matsushita cap was replaced as well as replacement of a shorted STK-0050 (hybrid IC instead of discrete transistors).

What gets me about the purple caps, or at least the ones I replaced in the MCS, was the tolerance: 40% +/-.

Bad enough the caps were old and dry, but also to have such loose tolerances even when new.

Watcher3223 said in January 13th, 2010 at 3:11 am    

@reptar1994

A Marantz CD-400 quadraphonic demodulator for the JVC CD-4 (Compatible Discrete-4) standard.

reptar1994 said in January 14th, 2010 at 4:45 pm    

at about 3:07 what’s the little unit on top of the receiver?

HAL4400 said in January 15th, 2010 at 10:27 am    

because the dollar is low now compared to the Euro.
i bought is for ± 120 dollar an sold it for 500 dollar±

pleeezeeatme said in January 18th, 2010 at 3:06 am    

What’s that in U.S. $’s? I just bought mine for $325.00, and I know it wasn’t the greatest deal, but it looked so good I couldn’t resist.

HAL4400 said in January 18th, 2010 at 10:40 pm    

well that depends, if i really like a model i keep it for myself.
But this 4270 i bought for 75 euro broken.
restored and refurbished it, and sold it on for 349,- euro.(this was a bidding i usually ask 200/250 for a good 4270.

pleeezeeatme said in January 22nd, 2010 at 4:07 am    

Do you you fix ‘em and sell ‘em? How much would you sell that one for, if you did? (I just got one, so I was curious)

HippyBunny said in January 23rd, 2010 at 9:41 pm    

My dads merants somehow stoped working for no reasion. what can be wrong? i really need to rattle the windows in our house!

HAL4400 said in January 26th, 2010 at 5:31 pm    

trace the power source.
usualy it’s a defective capacitor or transistor. nothing special.

good luck

dolphinlui said in January 27th, 2010 at 2:23 am    

Yes.only bass controlable on right channel.
And I have found a little bit lower output on
left ch.

HAL4400 said in January 28th, 2010 at 8:08 am    

yes well it is a strange problem..
only bass on one channel isn’t working???

dolphinlui said in January 30th, 2010 at 7:53 pm    

Thanks for HAl4400 .How about the bass problem.
Would you like to give me any suggestion.Thanks.

HAL4400 said in February 1st, 2010 at 10:16 am    

I wouldn’t recommend it. 50V 15.000uF is a good replacement.
ooh remove all the power supply capacitors!!!!
good luck!

dolphinlui said in February 2nd, 2010 at 12:11 pm    

Very useful video. I have 4270 too.But L ch. bass control
mufunction. Volume unit is OK by measuring.
Also,the capacitor 12,000uf(50v)x2 for rectify found leakage.Can I replace it by 10,000uf(50v)x4 in parallel.
Could anyone give me suggestion.

Arnebukowski said in February 3rd, 2010 at 10:31 am    

Cool, i have refreshd my 2270 and 4270 Marantz Receiver too. Now it looks new like too. I have over 400 Vintage Stereo thinks. Grundig, Luxman, Marantz, Sony, Chartwell, Monitor Audio…..

I like Vintage Hifi

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