Dear all,
There are issues with our 400 MHz wide-bore Unity Inova liquid/solid NMR.
The LEDs of power supplies PS201 and PS209 in the front panel of the power
supply are off. I measured 0 V for both from the front panel, but 5.3 V
directly from the PS201, and 33.5 V directly from PS209. The specified
voltages for PS201 and PS209 are 5V and 24 V, respectively. All the fuses
in the side of the power supply are ok.
Additionally, the RF pulses from both channels (#1 and #2) of XMTR are not
stable. Both channels may appear ok for one day, then become very weak the
next day. After I shut it down for a few days, the RF pulses sometimes come
back ok, sometimes not.
I don't know what part of the instrument causes the problem. Is it from the
power supply or other components, such as transmitters, synthesizers, etc.?
I appreciate your advice and thank you in advance.
Best,
Guoxing
Guoxing Lin Ph.D.
Chemistry Department
Clark University
950 Main St
Worcester, MA 01610
Tel: 508-793-7488
Fax: 508-793-8861
Received on Fri Dec 16 2022 - 10:40:08 MST