Question about Technics SCEH790 CD Shelf System

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Need a new amplifer for a sh-eh790 as my main audio output has gone

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Before throwing out your old amp open it up and check the processor inside the amp its a little black thing behind the fan. if that dont work then contact me again. and i will suggest more things. but if you really want to replace it would you give me your old amp please and here is a link to a amp for you. i know its correct as i have the same system. I LOVE TECHNICS PRODUCTS. http://cgi.ebay.co.uk/Technics-SA-EH790-AMPLIFIER-/130501062833?pt=UK_AudioTVElectronics_HomeAudioHiFi_Amplifiers&hash=item1e627830b1#ht_646wt_1141

Posted on Mar 25, 2011

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Posted on Jan 02, 2017

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1 Answer

Why will Amp not produce sound unless the input and output are patched together


A typical stereo receiver / amp consists of switching low level input signals (CD, DVD, Phono, DAT, etc.), processing them and then output to the amplifier (low level) input for amplification to levels needed to drive speakers. The low level signals would barely be audible via an earphone, so they need to be boosted significantly in order to drive speakers.

Some amps provide jumpers to insert into the phono jacks on the rear of the amp to bridge the processed low level output signals into the low level amplifier input. You could install a Y cable here to feed two amplifiers - or - connect a tape recorder's "REC L+R" to the low level output and the "PLAY L+R" to the low level amp input so that you'd hear the actual audio as it had been recorded on the tape.

If you remove the jumpers (or tape recorder if used instead), there is no way for the low level audio to get into the amp's low level inputs for amplification.

Feb 24, 2015 | Audio Players & Recorders

1 Answer

Hi, I bought a new JBL SCS 140 system with amp HK


Fuses blow when something is shorted. In this case it will be a semi-conductor of some kind. If the device uses IC for the main amplification then you are right to be worried!

The 158 amp is totally unsuitable for the JBL.
This is the specification of the JBL:
  • Recommended Amplifier Power 10 Watt
  • they are also 4 Ohm speakers.
  • 158 is: Output Impedance / Channel
    8 Ohm.

May 31, 2017 | JBL PB10 Subwoofer

1 Answer

I have a technics SA-EH790 WITH OUTPUT PROLEMS


Check its speakers. Sometimes they might be out.

Jun 14, 2012 | Technics SCEH790 CD Shelf System

1 Answer

I have a creative subwoofer which I replaced the two ICs thinking that they were the problem,but now the two speakers dont give out sound but the subwoofer one gives out an outburst of a buzzing sound...


Do not replace a part until you have proved with a signal and circuit test that there is absence of amplification. So I would suggest that you replace the original IC back to the circuit so that we start allover again.
Now you will need a signal tester- an audio frequency( AF) testor so that you can apply the signal and trace. Check the power to the subwoofer output and the main outputs. If present check with signal , check the parameters of the IC to confirm if there is amplification and BIAS to the circuit.
Once confirmed check the feeder resisitors,capacitors, check if any of them is open/short. If not recheck IC and replace once again from original source of spares.

Sep 16, 2011 | Creative Labs Audio Players & Recorders

1 Answer

No volume, picture only, the volume was lost last week for a day, but returned. Now no volume again.


Possible that the AUDIO OUTPUT SECTION is faulty. You need to use a audio signal tester to check and verify the section of amplification failure.
Check for dry soldering on the output IC, is so resolder the IC.
Also the Audio input/output must be checked with an external source to confirm the input and output stages.

Jul 25, 2011 | Sharp Televison & Video

1 Answer

Technics sh-eh790 stereo system


Hi there just wondering, if you cant fix your problem would you sell your sound processor as mines broke beyond repair. My email is cocksure001@homail.co.uk.

Dec 30, 2008 | Technics SCEH790 CD Shelf System

1 Answer

Hooking up audio components


This was answered here: http://www.fixya.com/support/t1371668-having_hard_time_connecting_various

- OPTiC
http://www.djproaudio.com
http://www.repairny.com

Dec 13, 2008 | Technics Audio Players & Recorders

1 Answer

Having a hard time connecting various audio components


Yes, it is a little tricky...

1) CD Changer (output) -> CD input on Amp

this is tricky... this will allow you to record to your tape deck, and control the sound via the EQ:
2) Tape Deck (tape out / recout) -> TAPE PLAYBACK on EQ
3) Tape RecOut on EQ -> Tape 1 Playback on Amp
4) Amp Tape 1 RecOut -> Tape Deck Playback / Input / RecIn
in essence, your creating a loop starting from the tape deck, going to the eq, then to the amp, then back to the tape deck to record.

Your EQ has another set of LINE IN and LINE OUT - use the second Tape 2 on the amp to create another loop. This will
allow you to control the EQ for any of the other sources.
5) LINE IN on EQ -> Tape 2 RecOut
6) Tape 2 Playback on Amp -> LINE OUT on EQ

5) Radio Tuner (output) -> Tuner input on Amp
6) DVD/VCR Combo Output -> AV/AUX on Amp

7) PC Computer... you don't have room for this. You can either use the PHONO input, and you'll have to purchase a Line Level Phono Converter
or, get a Y cable and split the signal and share with some other source.

Hope this helps.

- OPTiC
www.djproaudio.com
www.repairny.com

Dec 13, 2008 | Technics SH-GE90 Home Equalizer

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