When you have isolated the offending SSP, you need to pull it out of the crate and replace the appropriate hybrid. First, identify the line by referring to the diagram of the FASTBUS cable segment in the Table 2 or 3 Note that this is upside down from the map shown on the Kinetics Systems map of the cable segment. Then, use the map of SSP hybrids shown on the next page to locate the candidate faulty hybrid on the SSP.
The Location and Position-numbers of the 14 SSP Hybrids
Fastbus Cable Function Mnemonic : SLAC # Quick
Reference
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AL0 AL5 AR SS1 : G6N3 H-A1
AL1 GK WT SS2 : G6N5 H-A2
AL2 SR DK RD : G6N7 H-A3
AL3 AK DS MS0 : G6N9 H-A4
AL4 AS SS0 MS1 : G6O1 H-A5
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AD3 AD7 AD11 AD15 : E5N3 H-B1
AD2 AD6 AD10 AD14 : E5N5 H-B2
AD1 AD5 AD9 AD13 : E5N7 H-B3
AD0 AD4 AD8 AD12 : E5N9 H-B4
RB (?) NU (?) NU (?) NU (?) : E5O1 H-B5
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AD16 AD20 AD24 AD28 : C4N3 H-C1
AD17 AD21 AD25 AD29 : C4N5 H-C2
AD18 AD22 AD26 AD30 : C4N7 H-C3
AD19 AD23 AD27 AD31 : C4N9 H-C4
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Quick Reference Key
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C H-A1 H-A2 H-A3 H-A4 H-A5 C
R A
A H-B1 H-B2 H-B3 H-B4 H-B5 B (front)
T L
E H-C1 H-C2 H-C3 H-C4 empty E
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The hybrids are the tall black SIP's near the front of the SSP control board (the half of the SSP with the front panel). Replace the hybrid with a new one. Spare hybrids are found on the bottom shelf of the spares cabinet in a small gray box as of this writing. Put it in the right way, using the dot which marks pin 1; they all go in the same way. For an SSP II, one of the pins should be folded up or snipped off (this was to provide compatibility with another kind of hybrid). Just compare the new hybrid with the old to determine which one, and make sure the stub doesn't contact the socket.
Then carefully replace the SSP in the crate; you should meet very little resistance to inserting the card, yet it should push all the way to the backplane in the crate. Restore some or all of the cables for the cable segment, and check the offending line again.
Table 2: Top cable segment connector on front panel of SSP.
Table 3: Bottom cable segment connector on front panel of SSP.
Care should be taken to:
If this does not cure the problem, check to make sure that you had the right SSP and the right hybrid. If you did, call me (516 689 2991). If you didn't, try again.