Editing Amstrad PPC640 Capacitor Replacement Guide (section)

== Replacement procedure ==
# Disconnect the adaptor, the car lead and the telephone line, and take out the battery tubes.
# Open the case as described in the [[Amstrad PPC640 Maintenance Guide]], separating the two stacked boards and the modem board as needed.
# Photograph each area and note each capacitor's value, voltage and polarity before removing it. Compare with the table above.
# Fit new capacitors of the same capacitance and at least the listed voltage, observing polarity. Check that the larger parts, C139 (4700&nbsp;µF) and the 1000&nbsp;µF positions, will fit under the case before ordering. The schematic prints "(7MM)" beside C515, C516 and C518; measure the originals and match their size.<ref name="ppcsm" />
# Reassemble, then run the PPC from the adaptor and check the rails below before fitting discs.