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Technics SU-X102

Stereo Integrated Amplifier

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Technics SU-X102


Power output: 40 watts per channel into 8Ω (stereo)

Frequency response: 20Hz to 20kHz

Total harmonic distortion: 1%

Damping factor: 30

Input sensitivity: 3mV (MM), 150mV (line)

Signal to noise ratio: 73dB (MM), 82dB (line)

Channel separation: 55dB (line)

Output: 150mV (line)

Speaker load impedance: 8Ω to 16Ω

Dimensions: 360 x 129 x 305mm

Weight: 5.3kg


service manual   English - fmmech

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Reviewed Feb 23rd, 2014 by hubaudio

Grat amp...in many years always ready and good sound



re: SU-X102

After many years of regular use, my amp developed an intermittent power supply fault.

With the top cover removed, I discovered that by pressing down on the motherboard near the two power regulators (mounted on the same large metal heatsink as the audio power amp chip), that the fault could be easily re-created.

After removing the motherboard from the chassis, it was obvious that the soldering of the two power regulators had failed from repeated thermal cycling.

This was easily cured by re-soldering their connections to the motherboard.

re: SU-X102

Hello Brian!
I have exactly the same failure in my amp. Because I´m not a kind of technician, can you send a photo
where you point the place of failure?

thank´s beforehand

re: SU-X102

Sorry, I did not take a photo before I re-fitted this amp back into my HiFi cabinet.

The two power regulators are Q703 and Q704.

Download the SU-X102 service manual from this site which shows how to locate these parts and how to dismantle the main components.

Note that you need to only take off the top cover and the back panel.

Unplug the cooling fan and move the back panel to one side, without disconnecting the internal mains cabling between the back panel and the transformer / power switch.

Disconnect the two ribbon cables from the main PCB.

Then, after removing the 7 screws shown in the service manual, the main PCB, two input boards + heatsink can be slid backwards as a single unit, leaving the front panel PCB in place.
Do NOT remove the two screws between the heatsink and the main PCB.

Turn over the main PCB and re-solder these two regulators.

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