NGEN Series 386+ (CP-003 AB) - S/N CE106161
12 September 2010
Contents
- Disk Expansion XBUS module emits smoke, expires
- No display, keyboard status lights flicker continuously or stay on solid
Problem Log
Disk Expansion XBUS module emits smoke, expires
When powering on the Series 386+, the secondary Disk Expansion module (P/N HX-020 AB) emits smoke and fails to come ready. CTOS does not load.
Replace capacitor C60 on Miniscribe 6085 main logic board. The silkscreen is under the component; it is near transistor Q17. Component is 4.7µF 20% axial tantalum.
Adjacent inductor L2 consumed during failure of C60. Replace—component is 1/2W 82µH, 10%.
No display, keyboard status lights flicker continuously or stay on solid
After being stored for some time, the Series 386+ will power on, but not self-test or load the operating system. The status lights on the keyboard flicker continuously, or stay on solid. Nothing appears on the display.
Disassemble processor module (CP-003 AB) and reseat all boards and all socketed components.
Module is showing minor corrosion on interior metal surfaces. Electronics appear mostly fine—for now.