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9845b-1838a01653 [2018/09/10 15:13] cic |
9845b-1838a01653 [2018/09/10 16:04] cic [Initial Inspection] |
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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 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.\\ | ||
+ | \\ | ||
+ | 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.\\ | ||
+ | \\ | ||
+ | Voltage readings from the power supply test points were as follows:\\ | ||
+ | * C17: 165.9V, C18: 165.7V | ||
+ | * +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 | ||
+ | \\ | ||
+ | Other than the +12 value, everything is within spec (+/- 17V and 18V call for a +/1 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.\\ | ||
+ | \\ | ||
+ | Now on to the +12V problem ... | ||
===== Repair ===== | ===== Repair ===== | ||
===== Images ===== | ===== Images ===== |