Category Archives: Repair

HP/Compaq 2510p: changed DC power connector

I rather like my HP/Compaq 2510p so I have been really displeased when the laptop suddendly powered off even if it was attached to its power supply. The fact that I recently bought a new battery for it only added … Continue reading

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HP 6634A repair (blown filter capacitor) part 2

I finally remembered to order the three capacitors I needed for this repair in my last order and so I went ahead and did the repair. To reach the main board I didn’t exactly follow the service manual: after opening … Continue reading

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HP 6634A repair (blown filter capacitor) part 1

I was hoping to write a post about the calibration of my HP 6634A as the output voltage was a bit higher than what it should have been but as you can guess from the title that didn’t happen. Anyway, … Continue reading

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Tektronix Type 602 Display Unit repair

The Type 602 had been around for a lot of time before I decided to tackle its repair which had been easier than expected. First problem: missing mains fuse. Replaced and the unit turned on. Almost everything worked except for … Continue reading

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HP3456A: strange behaviour (solved)

The 1000V, 100V, 10V and 1V DCV ranges didn’t work right. The Ohms ranges didn’t work either. The self test didn’t pass (error #4). After reading the service manual I was expecting some problem in the Input Amplifier (a open, … Continue reading

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HP 3488A: boring “repair”

This one is the most disappointing repair I did if I can call this a repair. I bought two HP 3488A, one fully working but in not so great condition, the other one was in pristine condition but sold as … Continue reading

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Repair: HP 5328A part 3 – addendum

Here I wrote that I would order at least some replacement components before going on with this repair. I was wrong. I found two suitable zeners so I decided to test the counter anyway. No point in ordering components if … Continue reading

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Repair: HP 5328A part 3

Let’s keep this series going. In the last episode, our suspect was A2U1 which is HP part number 1826-0065. That’s the way the IC is marked and that is also what is written in the service manual. But I am … Continue reading

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Repair: HP 5328A part 2

Let’s follow part 1 It looks like that A2Q1 is fine but at least the problem is narrowed down to this DC-DC buck converter which brings the 26V rail to 5V. I am starting to suspect A2U1 but I didn’t … Continue reading

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Repair: HP 5328A part 1

As I do not have as much time as I would like to repair this counter I will write a number of posts while I continue to diagnose and repair this instrument. Symptom: the instrument doesn’t turn on. This isn’t … Continue reading

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