Comments on: Is Scanner HP 4070 Irrepairable due to Kamikaze Transistor? https://jestineyong.com/kamikaze-transistor/ Semiconductors, Test Equipments, Circuit Board Troubleshooting, Electronic Repair Courses and Many More! Mon, 13 Jul 2020 03:59:35 +0000 hourly 1 https://wordpress.org/?v=5.4.19 By: Jestine Yong https://jestineyong.com/kamikaze-transistor/comment-page-1/#comment-369883 Mon, 13 Jul 2020 03:59:35 +0000 https://www.jestineyong.com/?p=10350#comment-369883 In reply to SANDEEP SINGH.

Hi Sandeep,

Just open up the printer and trace the fuse circuit track downstream to see if there is any bad or burnt components.

Jestine

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]]> By: SANDEEP SINGH https://jestineyong.com/kamikaze-transistor/comment-page-1/#comment-369835 Fri, 10 Jul 2020 16:31:30 +0000 https://www.jestineyong.com/?p=10350#comment-369835 Dear Jestine Sir,
i have a hp scanjet 4070 scanner which malfunctioned after plugging in a 12 v power supply with reverse polarity.
I think the pcb has gone bad as even after changing fuse there is no initialization.
pls help me.

Regds
Sandeep
India

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