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IBM PCjr Troubleshooting Guide
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=== Sidecar fault === * Unlatch all sidecars and boot. If the system POSTs, re-add sidecars one at a time. * Verify each sidecar's edge connector is clean and seats fully. * A modem sidecar or a memory sidecar with a failed tantalum on its internal regulator will pull the system rails down. Replace the cap (see [[IBM PCjr Capacitor Replacement Guide]]). * If multiple sidecars are fitted and the PCjr now resets randomly, current draw may exceed what the standard external brick can supply. Fit the IBM PCjr Power Expansion Attachment.
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