5 Sep
2014
5 Sep
'14
10:02 p.m.
Rainbow Printset? http://bitsavers.trailing-edge.com/pdf/dec/rainbow/
* MP01722_PC100*-*B_Rainbow_Schematic_Jul84*.*pdf*, 2013-11-20 14:54,
3.3M
Also:
https://archive.org/details/bitsavers_decrainbowwSchematicJul84_3508632
Up to the usual DEC standards; no PSU schematic, however.
On Fri, Sep 5, 2014 at 3:56 PM, Tony Duell <ard at p850ug1.demon.co.uk> wrote:
The power supply of the Rainbow is, according to the print set, also a
H7841-A (120/240V) or H7841-B (120V only), so Tony would be right. It
seems
the same case (BA-25).
Some yeara ago I reverse-engioeered the complete Rainbow (including PSU,
all the option bords I have, etc).The SPU is vert conventioan (f0or DEC)
with a little lienar PSU to start it going.
I don't have the schematics or print set of the powersupply, but of
course
the power connector is also on the mainboard.
So the pinout is:
1. ACOK H
2. IOWR4 L (connected via a jumper)
On my diagramss (not havign the benefit of the DEC printset), that's the
12V supply to the chopper control circuitry.
3. key
4. -12V
5. +12V
6. +12V
7. +5V
8. +5V
9. +5V
10. GND
11. GND
12. GND
13. GND
Power OK (pin 1) is an open-collector (actually open-drain, for some
reason hte switchign component in the PSU is an FET) output.
Mains comes in via the IEC plug/filter module, then via a circuit breaker
to a 3 pin conenctector that goes to the switch/fan assembly. A 4 pin
connecotr (only 2 pins used [1]) then takes mains from the swithc to the
PSU. There is a 6 pin connecotr (4 pins used) that carries 12V from the
PSU to power the fan and also a ujumper in series with the live side of
the maisn so tht the PSU can't run unless this conenctor is in place (i.e
unless the fan is pwoered).
So unless yuo have the switch/fliter unit fro mthe case poweri nup thsi
supply may not be trivial. If you do want to do this, I cam provide
details of all the connectors.
[1] The other 2 pins are a 115V feed from the pimrary side of the PSU
presuambly to allow the use of an AC fan.
BTW, is the Rainbow printset online anywhere? I've not found it.
-tony