From: ohland@charter.net   
      
   My intention is findting another weg to turn on a 95. The remote power   
   -MIGHT- allow us to bypass SW1 -ASSUMING- there is a problem with the op   
   panel, the ribbon connector, or the planar itself.   
      
   Louis Ohland wrote:   
   > 95 XP Op Panel - Hidden Remote IPL Switch (SW1)   
   >   
   > What's the switch SW1 for on the op panel PCB?   
   >   
   > Tom says:   
   >     The SW1 switch is normally hidden behind the Op Panel Bezel.   
   > Contrary to what has been said about it not having any function in the   
   > Model 95, based on its wiring and some testing I have determined that it   
   > enables/disables the "Remote Power-ON" feature.   
   >     This allows the system unit to be turned on and off from an external   
   > source - via the J4 pin header on the planar board. For this to work the   
   > hidden SW1 switch must be pressed down, and then it's possible to power   
   > the system on by grounding pin 2 of J4, and power it off again by   
   > removing this connection. The system will power down only if the main   
   > power switch (SW2) remained in the OFF position.   
   >     The J4 connection would be realized using an externally powered   
   > electronic switch - relay, semiconductor etc. The control signal could   
   > be then supplied from a device connected to a telephone line or some   
   > other source.   
   >   
   > Ed. Now we know its real name - Remote Initial Program Load (IPL) Switch   
   > (source).   
   >   
   > Tomas Slavotinek wrote:   
   >> On 08.01.2023 19:57, Pertti Helander wrote:   
   >>> I was at opposite end of PSU connector, didn´t notice the mark there.   
   >>> When I closed PSU connector pins 1-2 with wire PSU fan starts.   
   >>> But when I checked with multimeter PSU connectors all pins there was   
   >>> 0 V  with ground row pins and +- 5V or+-12V pins.   
   >>> Between pins 1-2 there was 0 V not +5 V.  Is this OK?   
   >>   
   >> The voltage between 1 and 2 should be close to 5 V when the PSU is in   
   >> stand-by. Since you have to tie it low (to ground) to power the unit   
   >> on, 0 V is correct when the PSU is running.   
   >>   
   >> Here is how to measure the other voltages and what the expected ranges   
   >> are:   
   >> https://www.ardent-tool.com/85_95/Power.html#Primary_PSU_Voltages   
   >>   
   >> Also, Power Good (pin 16) should be at logic high (close to 5 V) if   
   >> everything is ok.   
   >>   
      
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