HP-82183A... Problem with ASTEC 0950-0408 :(

[mfleming]

Hello Thierry!

On an older 82143A board I have, this part appears as a separate printed circuit board with discrete parts soldered to it, then the board itself is soldered to the main printer board. What you seem to have is a later enclosed version of that same board. You won't be able to find a replacement, as this was undoubtedly made specifically for HP.

The printer service manual identifies the part as PS1 (Power Supply), part number 0950-0408. In the schematic, pins 1, 3 & 6 are Ground, pin 2 is a control signal driven by the Intensity switch, pin 4 is battery input and pin 5 is the output. That may help you in checking if the part works.

The printer diagnostics suggest checking the motor and drive parts if the printer doesn't respond to the Paper Advance button. With the power off, try turning the large wheel at the end of the shaft where the motor belt connects, in order to advance the printer head a short distance. When the power is turned on, the printer should try to return the head to the rest position. If the motor does activate, then you likely have a mechanical problem.

The printer service manual can be found on the MoHPC DVD and provides much more detail. In repairing one of these, I found the problems to be mostly mechanical, such as proper position and alignment of the speed sensor and position limit switch.

Good luck!
~Mark