There¡¯s also a ceramic disc capacitor fitted between if memory serves, pins 1 and 4 on the back side of the motherboard. I don¡¯t recall the exact value, maybe 1 or 10nF. The part specified has a silly 1 kv voltage rating. As near as I can tell there¡¯s no good reason for that other than the lead spacing matches the gap between pins, and probably that it fit and HP probably had them lying around. Being on the backs side of the motherboard, it¡¯s easily overlooked while one are upgrading the cards.
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It seems to me that the 8530R and 8510C systems had it. It also seems to me, if memory serves, that its utility might be moot if using an an 8360 or 8370 sweeper and not otherwise using the analog sweep output voltage. I¡¯m not sure about for an 8340, but I think it was specifically there for an 8350 or older sweepers with plugins.
