9845b-1838a01653
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9845b-1838a01653 [2018/09/10 16:05] cic |
9845b-1838a01653 [2018/09/10 16:13] cic [Initial Inspection] |
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| ===== Initial Inspection ===== | ===== Initial Inspection ===== | ||
| - | Includes Eventide WMAZ-4 in undocumented WMAZ-4(3) configuration, corresponding to 3 HP 128K memory boards. Includes supplemental ROM from Structured Software Systems with PUP+, MMS and CMD programs.\\ | + | Includes Eventide WMAZ-4 RAM board in undocumented WMAZ-4(3) configuration, corresponding to 3 HP 128K memory boards. Supplemental ROMs from Structured Software Systems with PUP+, MMS and CMD are installed.\\ |
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| - | The Option 100 power supply was removed from 9845T S/N 1838A06653 and (re-?)installed in this machine. Initial power up resulted in single beep, fan noise and power LED lighting on processor but no video output.\\ | + | The Option 100 power supply was removed from 9845T S/N 1838A06653 and (re-?)installed in this machine. Initial power up resulted in a single beep, fan noise and power LED lighting on processor but no video output.\\ |
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| Voltage readings from the power supply test points were as follows:\\ | Voltage readings from the power supply test points were as follows:\\ | ||
| * C17: 165.9V, C18: 165.7V | * C17: 165.9V, C18: 165.7V | ||
| * +17: 17.97V, +13: 13.04V, -17: -18.06V | * +17: 17.97V, +13: 13.04V, -17: -18.06V | ||
| - | * +18: 19.02V, +12: 2.18V, +7: 6.98V, +5: 5.14V, -12: -12.14V, -18: -19.06V | + | * +18: 19.02V, <color red>+12: 2.18V</color>, +7: 6.98V, +5: 5.14V, -12: -12.14V, -18: -19.06V |
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| Other than the +12 value, everything is within spec (+/-17V and 18V call for a +/-1V variation, but I'm not worried about a few hundredths of a volt). This is pretty amazing performance from a 40ish year-old power supply.\\ | Other than the +12 value, everything is within spec (+/-17V and 18V call for a +/-1V variation, but I'm not worried about a few hundredths of a volt). This is pretty amazing performance from a 40ish year-old power supply.\\ | ||
9845b-1838a01653.txt · Last modified: 2018/09/10 16:17 by cic
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