Good day,
I have on board LDK-100 PSU then suddenly telephone connected are not working. Saw on the power supply darken resistor (R49) and zener diode (D19) . Can anybody tell me what is the reason for this to get burned? And what is the real resistance of R49 and how to know it zener diode is OK because i dont have schematic diagram of this PSU. I tried putting 20ohm, 50ohm, but it is burning the resistor when cards are inserted. If i put 200ohm the power supply will not output 5 volts. Thank you for the help.
I have on board LDK-100 PSU then suddenly telephone connected are not working. Saw on the power supply darken resistor (R49) and zener diode (D19) . Can anybody tell me what is the reason for this to get burned? And what is the real resistance of R49 and how to know it zener diode is OK because i dont have schematic diagram of this PSU. I tried putting 20ohm, 50ohm, but it is burning the resistor when cards are inserted. If i put 200ohm the power supply will not output 5 volts. Thank you for the help.