OTGW measurements not OK
Posted: Sun Nov 20, 2016 11:59 pm
Hi,
Today I assembled the OTGW and finished the diagnostics part to be sure everything is correct. But I think there is something wrong...
The measurements (no boiler or thermostat is connected. Also USB is not connected):
Test #1: Voltage between pins 5 and 14 IC1: 5,06 V
Test #2: Voltage on X1: 23,85 V
Test #3: Current between terminals X1: 6,24 mA
Test #4: Current between terminals X1 (pin 3 = GND): 19,96 mA
Test #5: (X1 wired to X2): 6,19 V (should be a voltage between 15V and 18V) Btw, does it make a difference which pin of X1 (1 or 2) is connected to X2 (1 or 2)?
Test #6: (X1 wired to X2 & IC1 Pin 2 = Vdd): 6,19 V (so no difference)
Test #7: (voltage on pin 18 IC1, pin 3 =open): 0,000 V also one time after a while measured 2,758 V
Test #8: (voltage on pin 18 IC1, pin 3 = GND): 0,001 V also one time after a while measured 2,758 V
So test #5 and further failed.
I have checked de pcb and components but all looks fine. Also on the forum I couldn't find a solution.
Does someone have an idea what could be wrong or where to search?
Thanks in advance!
Kind regards,
Martin
Today I assembled the OTGW and finished the diagnostics part to be sure everything is correct. But I think there is something wrong...
The measurements (no boiler or thermostat is connected. Also USB is not connected):
Test #1: Voltage between pins 5 and 14 IC1: 5,06 V
Test #2: Voltage on X1: 23,85 V
Test #3: Current between terminals X1: 6,24 mA
Test #4: Current between terminals X1 (pin 3 = GND): 19,96 mA
Test #5: (X1 wired to X2): 6,19 V (should be a voltage between 15V and 18V) Btw, does it make a difference which pin of X1 (1 or 2) is connected to X2 (1 or 2)?
Test #6: (X1 wired to X2 & IC1 Pin 2 = Vdd): 6,19 V (so no difference)
Test #7: (voltage on pin 18 IC1, pin 3 =open): 0,000 V also one time after a while measured 2,758 V
Test #8: (voltage on pin 18 IC1, pin 3 = GND): 0,001 V also one time after a while measured 2,758 V
So test #5 and further failed.
I have checked de pcb and components but all looks fine. Also on the forum I couldn't find a solution.
Does someone have an idea what could be wrong or where to search?
Thanks in advance!
Kind regards,
Martin