trozen wrote:
is it correct that instrument was scanning when readbacks were taken?
is the instrument correctly identifying itself and valid tune and calibration files are loaded?
I hope the below helps to some extent...
readback 4 is for GC-EI option, so I guess it's okay
18: the voltage is outside of the range specified in the devices.cfg file.
Check the Analyzer Control PCB
19: the current is outside of the range specified in the devices.cfg file.
Check the following: (1) Dip Q0, (2) Fuse F4 on Analyzer Control PCB, (3) Front end optics for open circuit or short, (4) Analyzer Control PCB
26, 41: the RF Voltage Amplifier PCB current associated with the +28 Vdc is
low. Check the following: (1) +33 Vdc from PS3 and associate cables. If the +33 Vdc is OK, then check the cable connected to J2 located on the RF Voltage Amplifier PCB, (2) Ribbon cable connected between P2 located on the RF Amplifier PCB and J39 and J41 located on the Analyzer Control PCB, (3) +28 Vdc test point on the RF Amplifier PCB. If the voltage is not +28 Vdc,
then replace the PCB. If the voltage is +28 Vdc and the ribbon cable is OK,
then replace the Analyzer Control PCB
28, 43: the voltage is outside of the range specified in the devices.cfg file or
if the instrument is operating above mass 1000
33: the voltage is outside of the range specified in the devices.cfg file.
Check the Analyzer Control PCB
34: the current is outside of the range specified in the devices.cfg file.
Check the following: (1) Dip Q2, (2) Fuse F5, (3) Analyzer Control PCB
36: the Q3 sine wave reference is off
67: the temperature is outside of the normal operating temperature range of 20 to 50 °C. Check the heater circuit for the thermal hat. [your value is within spec but target value is 42°C]
68: the temperature is outside of the normal operating temperature range
of the diode by ±0.1 ºC. Check the heater circuit for the Q1 detector diode. [must be 40°C]
69: the temperature is outside of the normal operating temperature range
of the diode by ±0.1 ºC. Check the heater circuit for the Q2 detector diode. [if not a typo, this should be 42°C]
119, 120: not relevant if FAIMS option not installed
Thanks for the reply! The instrument was scanning when these were recorded, sadly.
18 & 19: I've attempted all that, and have a secondary Analyzer Control Board (I know it has an open circuit in the Q1 circuitry) but the results were the same.
26: I did all of those and it led me to the Analyzer Control Board again, but I really really really hope I don't need a third one.
28, 43: I checked that and the Analyzer Control Board is set to the lower mass setting as confirmed by an LED. I have oscilloscope data that I'll show below that I know for sure the Q3 RF Amplifier is gone, but Q1's RF Amplifier is receiving the reference RF, and outputting a very noisy signal, but Q3's is flat. The first pic is their reference input signals, and the second is their outputs extremely zoomed in.
34: Q2 won't dip. I'll check the fuse ASAP. Have you encountered the Q2 feedthrough? Does it go in in a certain way? I checked the way I have it inserted now for continuity and it was good.
36: For sure haha the RF Amplifier for Q3 is toast as can be seen above.
67: I'm not sure that I know where the thermal hat is. Can you share what they look like?
68 and 69: Same as 67, I'll have to look for those diodes. Are they on the RF Amplifier or the Analyzer Control Board?
Thanks for being willing to help! I hope my response hasn't overloaded you.