Original D32 PSU is marked:
Input: 240V 50/60Hz 20VA Output: 8.5V ~ 1.5A 28V ~ 250mA
----------------------- \ 1 2 3 4 5 / (Looking into the male socket \ / on the rear of the Dragon) \ 6 7 8 9 / \_______________/ 1 8.5V AC 2 8.5V AC 3 28V AC 4 0V (centre-tap) 5 28V AC 6 Connected to pin 1 inside PSU plug 7 Connected to pin 2 inside PSU plug 8,9 D64 circuit diagram shows both these connected to pin 4 but these are not connected inside the plug on two D32 PSUs I've checked. They are all commoned together on the power regulator PCB.
Power Connector _______________++++_____________________ | | | Modulator | | Heatsink | | ^^^^ | |______|||||||||_________________________| (Unconventionally, 9 is the 987654321 marked strand. Numbering ______|||||||||_________________________ convention matches the | ||||||||| | circuit diagrams and PCBs) | vvv | | | | | Pin Direction Function 9 ^ Composite Video to modulator 8 ^ +5V supply to modulator (linked from pin 2 via main board) 7 ^ Sound to modulator and monitor socket 6 ^ Composite Video to monitor socket 5 Ground 4 Ground 3 v -5V (D32) or -12V (D64) 2 v +5V 1 v +12VD64 power regulator PCBs have a -12V regulator (7912) fitted for the RS232 port instead of a -5V (7905) originally fitted to the D32s. A small -5V regulator is used on the D64 main board for the video circuit.
Last update: Wed, 14 May 1997 15:21:02 +0100 (BST)