Technics SU-8011 - DC Voltage on Speakers - UK Vintage Radio Repair and Restoration Discussion Forum

StevePace · 15th Jun 2019, 10:25 pm

HI Folks,

This is my very first thread and would like to ask for advice. I am repairing an SU-8011, and the issue is that the Left channel has a 30 + DC Voltage.

My Question is more directed to the voltages on the AMP STK-0039 since, i am getting 30 + Volts on Pin 0 , when i should be getting 1.2 Volts. The STK 0039 and Q306 and Q 305 are out as i believe they are fried .

Any suggestions would help

Thank you.

'LIVEWIRE?' · 16th Jun 2019, 8:18 am

Almost certainly an internal short-circuit between the output pin(pin 0) of the STK-0039 and it's +ve supply pin. This may also have fried Q305 & 306.

15th Jun 2019, 10:25 pm	#1
StevePace Diode Join Date: Jun 2019 Location: Malta Posts: 2	Technics SU-8011 - DC Voltage on Speakers HI Folks, This is my very first thread and would like to ask for advice. I am repairing an SU-8011, and the issue is that the Left channel has a 30 + DC Voltage. My Question is more directed to the voltages on the AMP STK-0039 since, i am getting 30 + Volts on Pin 0 , when i should be getting 1.2 Volts. The STK 0039 and Q306 and Q 305 are out as i believe they are fried . Any suggestions would help Thank you.

16th Jun 2019, 8:18 am	#2
'LIVEWIRE?' Rest in Peace Join Date: Mar 2006 Location: N.W. Oxfordshire(Chipping Norton) Posts: 7,306	Re: Technics SU-8011 - DC Voltage on Speakers Almost certainly an internal short-circuit between the output pin(pin 0) of the STK-0039 and it's +ve supply pin. This may also have fried Q305 & 306.