UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Non-working Commodore PET 3016

ScottishColin · 25th Apr 2021, 10:27 pm

PET booted with known good working datasettes plugged into port 1 and port 2.

At boot, there is a small amount of power to Datasette1 and none to Datasette 2 (i.e. I can hear datasette 1 turning for a small amount of time)

At rest after powerup,
UC7/6 (datasette 1) - 4 v
UC7/7 (datasette 2) - 5v

Pressing play (without any LOAD commands)
UC7/6 - 0.23v
UC7/7 - 5.1v (this noticeably changes on the meter from 5v)

LOAD "",1 command issued and PLAY pressed on datasette 1 - 0.23v
LOAD "",2 command issued and PLAY pressed on datasette 2 - 5.1v

Colin.

25th Apr 2021, 10:27 pm	#1760
ScottishColin Octode Join Date: May 2012 Location: Perth, Scotland Posts: 1,821	Re: Non-working Commodore PET 3016 PET booted with known good working datasettes plugged into port 1 and port 2. At boot, there is a small amount of power to Datasette1 and none to Datasette 2 (i.e. I can hear datasette 1 turning for a small amount of time) At rest after powerup, UC7/6 (datasette 1) - 4 v UC7/7 (datasette 2) - 5v Pressing play (without any LOAD commands) UC7/6 - 0.23v UC7/7 - 5.1v (this noticeably changes on the meter from 5v) LOAD "",1 command issued and PLAY pressed on datasette 1 - 0.23v LOAD "",2 command issued and PLAY pressed on datasette 2 - 5.1v Colin.