JohnsonVintageRepairs

Hi All - Well... my fix above was temporary at best, it worked for a few hours. This intermittent issue of the display turning off after 3 seconds after powerup was fixed by the following: 1. Check 12V power rail to the FM Tuner board. 2. Check that clock from IC LM7001 is being generated and sent to main controller IC chip TMP47C870N. The main IC shuts down after 3 seconds if clock is not present. In my case, Q944 transistor was not providing sufficient voltage to FM Tuner board. Replaced original Q944 (2SD1682) with NTE 2684. ~Ryan J

Hi All, I serviced the Carver HR-772 with a very similar issue and may have a fix. An intermittent problem from the client was that it would power on and then power itself off after 3-4 seconds. After chasing a few rabbits, it turned out to be dirty contact switch of the "stand-by" push button. By squirting some deoxit in the crevice and actuating the switch, the Carver no longer has the issue. Had to remove the front panel to get to it properly. ~Ryan J