Editing IBM PC Series 300 (section)

== Common Faults ==

* '''CHHSI capacitor plague on PC 300PL 6862 / 6892''' — '''560 µF 25 V CHHSI-branded electrolytics''', date codes 1998–1999 (typically WG(M) series), around the VRM and CPU power filtering, are documented as failing. Community recommendation is to replace every CHHSI on the board even if visually fine.<ref>https://www.badcaps.net/forum/troubleshooting-hardware-devices-and-electronics-theory/troubleshooting-desktop-motherboards-graphics-cards-and-pc-peripherals/86515-ibm-300pl</ref>
* '''CR2032 RTC battery''' — all PC 300 generations use a socketed CR2032 (no soldered NiCd).
* '''CMOS auto-prompt on settings change''' on PC 350 / 300XL — '''any''' configuration change including unplugging the mouse triggers a "press F1 for setup" prompt.<ref>https://ancientelectronics.wordpress.com/2021/12/16/ibm-pc-300xl-model-6588/</ref>
* '''EDO vs SDRAM DIMM keying confusion''' on 6577 / 6587 / 6588 / 6589.
* '''Bundled IBM G51 CRT monitor overheating''' (MT 6541-Q0E/G/N/S, 6541-02E/N/S) — '''US CPSC recall''' documented.<ref>http://web.archive.org/web/20030803071351/https:/www.cpsc.gov/cpscpub/prerel/prhtml03/03088.html</ref>
* '''Coppermine boot blocker''' on 6862 / 6892 without BIOS update.