: Specific models are required to simulate aircraft loads during bench testing.
| Original Part | Type | Modern Substitute | Notes | | :--- | :--- | :--- | :--- | | 2SC5200 (NPN pass) | Power transistor | MJL4281A | Higher SOA, identical pinout | | 1N4148 | Signal diode | 1N4148 (still made) | No change | | 4700µF/50V (85°C) | Electrolytic cap | 5600µF/63V (105°C) | Improved ripple rating | | LM723 | Voltage regulator | UA723 or direct drop-in | Still in production | | 5k pot (voltage adjust) | Carbon potentiometer | Bourns 91A1A-B28-B15L | Sealed, longer life | ps-855b maintenance manual
Batteries must be left in a discharged state, as this causes permanent damage. : Specific models are required to simulate aircraft
With no external power applied, press and hold the button for 5 seconds. : Verification of the unit's condition, similar to
: Verification of the unit's condition, similar to a standard preflight check.