1. Seyoung Han / Ewha Woman’s Univeristy
Maintenance work
Seyoung Han / Ewha Woman’s Univeristy
梨花女子大学校

2. MuTr RX/TX Board Debugging
Performed in John Haggerty’s test bench
(Minjung, Seyoung, Takeru, Kwangbok)
MUTR
TX board
GTM
FEE
RX board
DCM
electrical
optical

3. Rx, Tx board test Test each slots from J1 to J5 Rx board good boards
total 9 good board
labeling as RX #1
bad board : got the bad slots
total 3 bad board
labeling as RX #101
Tx board : 6 boards are all good and labeling as TXB #1

4. North Station 3 ?

5. North station 3 20 Pin block connector
even numbers of pins should be grounded to the chamber frame
some octants have not grounded pins
octant 3, 4, 5, 6, 8 ground connections are all good : 7 has to be tested
octant 1 gap 2
pin 2 was not grounded with chamber frame
pin 4, 6, 8, 10, 12, 14 has 489kΩ with chamber frame
pin 16, 18, 20 has grounded
pin 2 to 4 has infinite resistance / pin 14 to 16 has 489kΩ
octant 2 gap 2
pin 2, 4, 6 has 1MΩ with chamber frame and others

6. Solution
Install Jumper Cables at block connector for adequate Grounding between anode cards and frame ground
To be tested Shorting Shield wire and GND cables at HV end. (May improve noise by 1 ADC ch or so.)