{"id":482,"date":"2024-06-19T08:37:00","date_gmt":"2024-06-19T06:37:00","guid":{"rendered":"https:\/\/blog.boscolab.de\/?p=482"},"modified":"2024-06-20T06:45:41","modified_gmt":"2024-06-20T04:45:41","slug":"hp-9872b-plotter","status":"publish","type":"post","link":"https:\/\/blog.boscolab.de\/?p=482","title":{"rendered":"HP 9872B Plotter"},"content":{"rendered":"\n

I have an HP 9872B plotter in my collection that is in very bad condition. There is a short circuit in the power supply somewhere. The foil on the paper surface has come off. I noticed that the HP 9872B plotter has a card slot. Does anyone know what it is for?<\/p>\n\n\n\n

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I think I’ve found the reason for the fuse blowing. Perhaps a short-circuited diode. With the variable transformer I already have 2 A at a few volts. I found a diode with a short circuit. Maybe I have a suitable one in my spare parts store.<\/p>\n\n\n\n

I swapped a few filters. I didn’t have the right values \u200b\u200bbut I improvised.<\/p>\n\n\n\n

YES!!! Successfully repaired! Three of four diodes replaced. The HB 9872B plotter has come back to life!<\/p>\n\n\n\n

The missing HP logo was replaced with an original one. Everything was cleaned and the HP 9872B plotter was ready.<\/p>\n\n\n\n

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and finally a plot from the HP 8568B pic.twitter.com\/q1kTKHzpia<\/a><\/p>— Bosco (@BoscoMac) May 25, 2024<\/a><\/blockquote>