DJ 9800 does not power up

[hokie-1966]

This was a great printer for many years until it died a year ago!  Since then the printer will not turn on when pressing the power button.  I very closely followed the HP troubleshooting guide for power supplies, but had no success in getting the printer to turn on. 

When the power cable is plugged in, the green light on the internal power supply module is ON.  With the PS module removed from the back of the printer housing, the voltage output measures 32 VDC, as specified on the PS module.

Below the two ink cartridges (in the "home position") there is a "tray" that  moves up and down as the ink cartridge carriage moves in and out of that "home position".  A vertical flap on that tray is currently blocking the removal of both ink cartridges, perhaps an indication that the printer stopped operating part-way through a sequence of leaving or returning to that "home position".

That's all I have observed.  I really miss the use of this printer for certain projects.  Your assistance will be greatly appreciated! 

Thanks,

Rick

[greenturtle]

Hi,

Thanks for using the forum.

Did the PS just lights up and then goes off?

From the description, it may be a faulty PS. We have seen faulty PS in the past with this printer.

It's no longer in production though.

Thanks.

[hokie-1966]

Hi GreenTurtle,

Thanks for your question.  The PS light comes on and stays on.  

Since the PS in these units are known to occasionally be faulty, I'll try a resistive load test to see if the voltage holds at 32 volts up to 25% -50% of its rated output.  I'll report back when done.

hokie-1966

[hokie-1966]

The PS seems to be working!

Using a digital voltmeter, an analog ammeter, and a 40 ohm, 2.5 amp, wirewound variable resistor, the output from the PS measured as follows:

No load           30.6 v

40 ohms         30.5 v         0.8 amps

20 ohms         30.4 v         1.2 amps

10 ohms         30.3 v         2.0 amps

In all cases the green PS light remained on, unchanged in intensity.  

The non-linear amp readings are likely caused by inaccuracy of low end scaling on the 15 amp meter, the internal impedance of the meter, and change of resistance in the variable resistor due to heating.

Since the PS is working, does anyone else have an idea to get this printer working again?

Thanks for reading my post!

[greenturtle]

Hi,

Thanks for doing the measurements, you're troubleshooting more than most users in the forum.

If you can try pressing the power button and see if it powers up?

If that doesn't work, then it's not the PS issue but other components (e.g. Power board or Main logic board) issue.

Sorry can't help much here.

Thanks,

[hokie-1966 · Accepted solution]

As of 12/13/15 there have been 74 views of my original post.  Thank you to all who read it.  Especially thanks to Green Turtle who offered several good trouble shooting suggestions.

As previously stated, the power supply for the DJ 9800 is working well, even supplying full voltage with a resistive load at and slightly above its rated capacity.  Pressing the power button, however, does not result in the printer turning on.

Apparently the control circuit board has failed and the printer is toast.  Rather than spend more time on this problem, the only logical remaing task is to put the printer in the county recycling bin for electronics equipment.

Thanks again, all.