Re: Looking for HP Laserjet IIp+ power supply
Actually I just fixed it ;) Never Mind. I took the supply all the way apart and found one secondary filter cap that had leaked electrolyte. Cleaned and fixed that, but still no luck. 155 volts on the main filter cap. Then I noticed that occasionally it would try to start for a blink but then the voltages would just drop to zero. So I started looking around the section that had to be for bootstrap power to the switching regulator, a common TL494 chip with datasheets online. Sure enough, a small electrolytic on the primary side had blown its bottom out. The diodes around it were still good. Changed that cap and a couple more suspicious looking small ones and the voltages came right up (including the 24V once I pushed the cover-open microswitch). Put it back in the printer, screwed it all together (a very modular design for easier field servicing) and fired it up. Test page printed perfectly. Saved some $ on a new laser printer. For now :) I like these old cinder-block-sized (and weight) printers too. They last ALMOST forever... Charles
Re: Looking for HP Laserjet IIp+ power supply
I miss the old IIp / IIIp printers :'( <3 They were small bricks, but they were so cute ---8<---Corte aqui---8<--- http://www.tabajara-labs.blogspot.com http://www.tabalabs.com.br ---8<---Corte aqui---8<--- Em ter, 30 de out de 2018 às 23:01, Charles via cctalk < cctalk@classiccmp.org> escreveu: > The main power supply for my ancient Laserjet IIp+ printer has given up. > Fuse is not blown. Power switch has continuity... don't feel like trying > to > debug and repair the "brick". > > There are two Sony labels: One says Model RG1-1782 (I think that's the HP > part number) and the other Model CD-91A, 100-115V. > Does anyone have a working one in their junkbox? > > This is the LAST time I repair it before it goes to the recycler! I think > I've changed every module except this one. > It has become my grandfather's axe: new head and new handle, but it's > still > my grandfather's axe :) > > thanks > Charles > >
Looking for HP Laserjet IIp+ power supply
The main power supply for my ancient Laserjet IIp+ printer has given up. Fuse is not blown. Power switch has continuity... don't feel like trying to debug and repair the "brick". There are two Sony labels: One says Model RG1-1782 (I think that's the HP part number) and the other Model CD-91A, 100-115V. Does anyone have a working one in their junkbox? This is the LAST time I repair it before it goes to the recycler! I think I've changed every module except this one. It has become my grandfather's axe: new head and new handle, but it's still my grandfather's axe :) thanks Charles
