Hi Members,
I've had this TM504 for 10 years maybe, and it has right to left: DM501A, DC503A, AM502 & PS503A.
All has been good until recently. The DM501A has a start up issue.
When it is started from cold, all that is displayed is a - (minus sign). It will not respond to any buttons pushes except the minus sign will disappear if I activate AC from DC.
Then after about 5 or 10 minutes it will suddenly start working on all functions.
I took the 501 out & checked all the electrolytic around the regulators. I was surprised to find they were all 85°C caps but they all tested good & do not show any distress. I looked for cracked solder connections & did not see any. I have not remelted the regulator pins, yet. I started to reseat the IC's but halted that.
The DM501 only seems to "fit" the left slot so I cannot power it on the other 3 slots. Maybe the left slot has an issue?
So I thought I'd ask for guidance here. I do not have a single port "TM504" for testing, but I wonder if there is anything I should look for in the DM504?
Thanx - Bob
Bob W8RMV