Question about Technics SA-AX710

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Have Technics SU-7700 amplifier. Powers up but no sound from tuner. Verified that tuner works - hooked it up to AUX on son's receiver; works fine. Where do I start to diagnose what is wrong? Would a service manual in my inexperienced hands be worth getting? How can I check the power supply to see if that is first problem?

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6 Suggested Answers

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  • 2 Answers

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Posted on Jan 02, 2017

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SOURCE: Technics SU-G91 OVERLOAD PROBLEM

I had the same problem. As soon as the volume reached about 24db it would go into overload. I was able to fix it by soldering all the connections on the larger power module. The one connected the the heat sink. When I took it apart there where several solder points that had come loose.

Posted on Dec 01, 2007

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SOURCE: Technics SH-AC300 Connection to Power Amp & Pre-Amp

Hi!
The problem is, that your SH-AC300 needs an amp with 5.1 input (but no decoder). For this purpose technics delivered SA-AX710.
So if you'd like to use your current equipment it would be impossible.
The only option is for you to buy 2 more Power Amps (SE-A900S), so that each of 3 amps would take care for one part of music. (one for FL, FR; one for RL, RR; and one for sub and center).
Another option is for you to buy SA-AX710. Then all the problems would be solved with it.

Posted on Feb 24, 2008

  • 1 Answer

SOURCE: Technics ST-X302L tuner - Unit not powering on

i have the same unit and a similar problem, after a fall of the tuner on the floor while i was cleaning my room, first times the st-x302l was powering fine but after some minuts it quit alone.. now (i dont know why) it remains on but if there is an interruption of electricity it dont turn on anymore, it turn on only by removing the metal chassis and moving random the electronics.. i think it has some electronic contact or circuit break.. i brought it to a specialist in electronics and he told me the reparation would be too expensive so i prefer to try fix it by myself.

Posted on Apr 10, 2008

  • 1 Answer

SOURCE: How to set tuner presets in Technics SA-GX550 receiver

The user manual is available free at:
http://support.panasonic.co.nz/docstore/SAGX550%20Book.pdf

Posted on Jun 26, 2008

  • 3 Answers

SOURCE: My technics amplifier su-g86 started

Most of the time this problem is caused by bad solder joints.
All the units I have repaired all that was needed was to reflow the solder joints.
The most common place is the leads of the hybrid IC.
Usually there are very very fine cracks which can barely be seen with a good magnifying glass.
I usually go ahead and resolder most of the solder joints related to the output section.
Basically the mechanical stress of the heating and cooling causes this as well as the manufacturer trying to use as little solder as possible.

Hope this helps,
Richard

Posted on Feb 25, 2009

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Greetings
Is there any indicator on or its all off?
anyway i will assume that there is none
1.check power fuse if blown.
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Let's break this into its two parts.

1) SU-Z550: You don't say WHAT source(s) you tried to use on the CD/AUX, TUner and PHONO inputs. The external device itself could be the source of the low volume. Try swapping the Left and Right cables to see if it follows the source channel or stays with the amplifier channel.

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"PHONO" is literal and exclusively FOR A TURNTABLE - NOTHING ELSE - EVER.

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