HP9845 service toolkit

[Tony Duell]

My workbench is currently covered with a 9845 is many bits :-). And I am 
slowly figuring out just what's inside that darn machine...

Anyway, I believe there was an HP service toolkit for it (based on the 
markings on the PSU cover). Does anyone have it? 

If so, I have some questions 

1) What did said kit contain (other than normal hand tools, which I have 
anyway). I am almost sure 2 of the items in the kit were a 'Discharge 
Tool' for the power supply and a 'Turn on fixture' to run the machine 
without a monitor

2) What does the 'Discharge Tool' consist of? I'll guess it was just a 
reisstor connected to a couple of isulated probes, or a plug, or 
something. There are some insulated holes on the SPU cover, under them 
are bare pads on the PCB connected to the terminals of the mains 
smoothing capes. The instructions are to insert the tool into 2 of the 
holes, then into the other pair, then to check the voltage between the 
holes you put the tool in (basically, check the caps are discharged) 
before removing the PSU. From the size of those capacitors (1800uF, 200V, 
small coke-can size), I would agree!

3) More importantly, what does the 'Turn On Fixture' consist of? Again 
I'll make a gues. It's a little PCB that goes into one of the edge 
connectors in the monitor pillars. But which connector, and what's on the 
PCB? Does it just short a couple of pins together to complete some kind 
of interlock circuit, does it contain load resistors, or worse, does it 
contain ICs?

HAs aonone else been foolish enough to dismantle the printhead? Suffice 
it to say it consists of a normal PCB that connects to the printer cable, 
a seramic substrate containing the (thermal) printhead heater elements, 7 
seramic hybrid circuits that contain the driver cirucits, and something 
like 35 of those metal-rings-round-elastomer connectors (like those 
between an HP41 logic board and keyboard) to link everything up...

-tony