Anushri Power distribution test issue

Discontinued products Anushri
#1

Hello

I finished my Anushri yesterday then I started the power distribution test and I have some bad results :

Point 1 before the diode : 5.59V
Point 2 after the diode : 4.77V
Point 2 on LM7805 IC14 : 3.17 but becomes very hot after a while
Point 3 on LM7905 IC21 : 0.22 but doesn’t become hot

for the rest :

Cyan : 0.20V
Purple : 3.13V
Red : 3.5V
Green : 0.22V

I tried with a power supply of 300 mA on 7.5V

Could you advise ? maybe the first diode on point 1 is wrong or borken ?

#2

Your power supply is too weak (under load it delivers 5.59V only), try another one.

Also, check that you haven’t swapped the two regulators ; and that the LT1054 is inserted in the correct direction when you perform the test.

#3

Thank for your quick reply , I’ll check tonight. I guess also I made a mistake with the LT1054 …

#4

Ok it is solved ! I was too quick and mix the LT1054 with another one…hopefully nothing is broken ! ;)-… thanks again.

#5

Big chance the IC you used in stead of the LT1054 is broken. So please remember wich it was, this will save a lot of searching for future problems.