Editing Amstrad PCW 9256 Troubleshooting Guide (section)

== Power supply ==
The supply is on the monitor board: the STK7308 hybrid (IC501), switching transformer T501, two AN6531s (IC502, IC503) and an L7824V regulator (IC504), with the mains rectifier diodes D501–D504 and the 150&nbsp;µF 400&nbsp;V reservoir C505 in the mains area of the board.<ref name="sm9256" />

Amstrad measures the outputs at connector A, with CP101 disconnected and electronic loads on each output as in Fig. 2-1 of the manual:<ref name="sm9256" />

{| class="wikitable styled-table" style="width:100%; text-align:center;"
|+'''Supply outputs (service manual p. 3)'''
! Output !! Load !! Expected !! Adjust with
|-
| 24&nbsp;V || 1.2&nbsp;A || 24&nbsp;V ±1&nbsp;V || No adjuster
|-
| 12&nbsp;V || 1.2&nbsp;A || 12&nbsp;V ±0.01&nbsp;V || VR502
|-
| 5&nbsp;V || 1.8&nbsp;A || 5&nbsp;V ±0.05&nbsp;V || VR501
|}

* F501 blown: look for a short in the mains area first, at the rectifier diodes, C505 and the STK7308, before fitting a new fuse.<ref name="sm9256" />
* 24&nbsp;V outside 23–25&nbsp;V: there is no adjuster for it. Check the L7824V regulator (IC504).<ref name="sm9256" />
* 12&nbsp;V or 5&nbsp;V low, noisy or out of reach of VR502 or VR501: suspect the supply electrolytics; see the [[Amstrad PCW 9256 Capacitor Replacement Guide]] and [[Capacitor Failure Symptoms]].