186. Master 128 power supply tip
     ~~~~~~~~~~~~~~~~~~~~~~~~~~~
The power supply unit is marked "No user serviceable parts inside" - but
there are two fuses within this unit, and replacements of a similar type can
be purchased from TANDY. If you get intermittent faults, it may indicate a
dry joint on the main power transistor. (You must use your own discretion
with regard to these two hints -  liability cannot be accepted for damage to
your computer.).