The manual's schematic (Appendix D, sheet 4) showed that U3's Vcc came from a small linear regulator fed by the battery boost converter. That regulator—a tiny LM317L—was known to drift with age. The manual’s "Known Issues" section (page 301) confirmed: "Revision 2.1 boards: Replace LM317L (R43) with upgraded 1.5A variant for high-cycle units."
at 360 Joules from a full charge, the accumulator likely needs replacement through an authorized service department. Important: Manufacturer's Instructions primedic defi b service manual work
: Service documentation warns against charging the unit while the status LED is still green, as short-cycling damages the chemistry over a long-term basis. 2. Technical Safety Controls (TSC) and Testing The manual's schematic (Appendix D, sheet 4) showed