Last update: Wed, 14 May 1997 15:21:02 +0100 (BST)
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 +12V
D64 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)