Like many Kenwood amps of this era, the A-5j has a sophisticated speaker protection relay. The manual explains what to do if the unit goes into "protection mode" (blinking power LED) – a critical troubleshooting section.
A word of caution: the internet is full of malware-ridden PDFs and low-resolution scans. Here are the safest, most reliable sources for the Kenwood Amplifier A-5j Manual. Kenwood Amplifier A-5j Manual
The original Kenwood A-5J Service Manual (in Japanese/English) is occasionally available from: Like many Kenwood amps of this era, the
When searching, note that A-5J is largely identical to A-5 except for voltage and labeling differences. When searching, note that A-5J is largely identical
Before you power yours on, keep a few things in mind:
If you ever plan to sell your A-5j, having a PDF or original manual increases the resale value by 15-20% among collectors. It proves the unit was cared for.