Instructios model #1508 - Solar Noma 7 Day, 6 Event Outdoor Timer - Easy To Use +warr

1508 ? ? ? please be more specific. I'll jump in and venture to say "1508" is a model number, but what brand?
Singer
Brother
Elna
White/Elna
Juki
Husqvarna / Viking
Janome
Kenmore

http://cpcsc.info/2017/09/studiomaster-powerhouse-horizon-1508-user-manual_o2/

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contact a juki dealer about a manual
email these sites about a manual
sewingpartsonline.com
sewusa.com
sewvacdoctor.com
a1sewingmachines.com
sewingmachines.com

Your receiver has a problem with power supply or one of the channels is bad. You need to bring it for repair to local repair shop or mail it to ebc electronics

Not familiar with this model but seems like the protection circuit is kicking in, this could be caused by an imbalance of Ohms between channels or a short. remove & check all speakers and cables for continuity or shorts, does the unit power on without speakers or in a different mode (surround off).
always add speakers in pairs (L&R) before testing to prevent possible protection circuit, test main speaker pair first then add surrounds (all according to the allowable Ohms range for the amp of course)

Go to www.uniden.com type in your model # and you can download a manual for free. Hope this helps.

perhaps u might consider going to a(n) (unauthorised) repair centre. just check with folks around u or maybe audio forums within your area. authorised agent doesn't always mean the best. i suspect they may have used reconditioned components.

AVR 1508 doesn't upconvert. Only components coming in on HDMI will go out HDMI.