Category Archives: Repair

Repair of malfunctioning equipment

HP 3468A Bench Multimeter Repair

Posted on February 23, 2013 by modemhead

Hewlett-Packard has built a reputation for quality bench multimeters every bit as impressive as Fluke has for the handheld variety. Nowadays they’re called Agilent, but this unit has the HP nameplate on it, and date codes on the parts inside … Continue reading →

Posted in Repair, Teardown | Tagged , | 23 Comments

Beckman 3020 DMM Repair

Posted on February 15, 2013 by modemhead

Handheld digital multimeters were just beginning to gain popularity in the late 1970s.  Fluke was there of course, but so was Beckman.  This is a Beckman 3020 3½-digit 2000-count model that dates to 1979.  It has the classic Beckman ‘look’ … Continue reading →

Posted in Repair | Tagged , | 59 Comments

Fluke 83-III Rotary Switch

Posted on January 24, 2013 by modemhead

It’s a fact that you can repair as many multimeters with a bottle of isopropyl alcohol and some Q-tips (cotton buds), as you can with a soldering iron.  In many cases, malfunctions can be fixed by careful disassembly and cleaning … Continue reading →

Posted in How-To, Repair | Tagged , , | 15 Comments

Yokogawa 7534-03 Multimeter

Posted on January 17, 2013 by modemhead

Japanese equipment maker Yokogawa made handheld DMMs for HP before HP became Agilent.  This 3200 count 3½ digit Yokogawa-branded model is very similar in appearance to the HP E2378A model.  Unlike the HP, this unit adds a high-impedance ‘ADP’ mode, … Continue reading →

Posted in Repair | Tagged | 19 Comments

Fluke 77-IV Copper Corrosion

Posted on January 6, 2013 by modemhead

The fourth generation of the classic Fluke 77 shares the same basic design and circuit board as the rest of the 170-series (175, 177, 179).  Apparently a common problem with these circuit boards is the appearance of a white powdery … Continue reading →

Posted in Repair | Tagged , , , | 46 Comments

Fluke 8020A LCD Replacement

Posted on December 28, 2012 by modemhead

Fluke introduced the 8020A in the late 1970s as its first handheld DMM.  These 3½-digit, 2000-count models can still be found on the used market, and can still be very useable, if they’re in working condition.  Unfortunately though, LCD problems … Continue reading →

Posted in Repair | Tagged , , , | 51 Comments