[Disha, Elenna, Keita]

Following FRS ticket 37601, we fixed the incorrect wiring of the OMC PZT cables. We determined that both OMCA and OMCB PZTs were wired incorrectly following this diagram D2200276. We found the black dots on the outside of each PZT to determine the positive lead. Disha and Keita noted that for OMCA, relative to the "head" of the manta ray (short side, this terminology is used in the build document T2100190), the PZT closest to the head has the black dot on towards the center of the manta ray, and the far PZT has the black dot towards the outside of the manta ray. For OMCB it is opposite, the PZT closest to the head has the positive lead on the outside, while the far PZT has it on the inside. I am specifically not naming PZTs 1 or 2, or LV or HV, because it was not clear to us which one is which.

We confirmed that the pins were in the wrong location on the cable, so Keita proceeded to swap the pins around.

The schematic diagram suggests there should be a shielding for the PZT cables wired to pin 1, but there was no such shielding on any pin.

OMCA:

far PZT: had pins on 1-6 (plus-minus), we moved these pins to 5-9 (p-m)

near PZT: had pins on 2-7 (p-m), we moved these pins to 4-8 (p-m)

OMCB:

far PZT: had pins on 1-6 (p-m), we moved to 5-9 (p-m)

near PZT: had pins on 2-7 (p-m), we moved to 4-8 (p-m)

We confirmed with a multimeter that there were no shorts between the pins after the pin swap.