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Fluke Hydra 2620A 2025A ERROR 6 caused by dead potted RTC battery - Replacement

O que você precisa

  1. Fluke Hydra 2620A 2025A ERROR 6 caused by dead potted RTC battery - Replacement, Fluke Hydra with Error 6 on powerup: passo 1, imagem 1 %32
    • Front view of unit, error 6 on powerup "configuration corrupted" caused by a dead battery potted into a realtime clock 28 pin DIP part that is no longer available. But there's always a way. To open the unit, remove the two screws in back and 3 or 4 screws on bottom (depends on unit) and slide off the cover.

    • The corrupted configuration means that on each powerup cycle, the channel setups, time and date, and other settings all have to be re-entered with each power cycle event.

  2. Fluke Hydra 2620A 2025A ERROR 6 caused by dead potted RTC battery - Replacement, Locate SRAM/RTC with battery module: passo 2, imagem 1 %32
    • This is the main circuit assembly on the bottom of the unit, showing the RTC/SRAM/xtal/battery chip with the dead internal battery causing the error.

  3. Fluke Hydra 2620A 2025A ERROR 6 caused by dead potted RTC battery - Replacement, Mask part before using dremel cutting tool: passo 3, imagem 1 %32
    • Here, I've just cut a hole out of a newspaper and applied tape around the perimeter to catch plastic and metal bits, rather than unsoldering the 28 pin DIP from the board. The Dremel cutting wheel is running at lowest speed for minimum telegraphed vibration to the board and display.

  4. Fluke Hydra 2620A 2025A ERROR 6 caused by dead potted RTC battery - Replacement, Make slots 1/8" from each end of chip: passo 4, imagem 1 %32 Fluke Hydra 2620A 2025A ERROR 6 caused by dead potted RTC battery - Replacement, Make slots 1/8" from each end of chip: passo 4, imagem 2 %32
    • Very carefully use the dremel cutter (low speed) to cut slots about 1/8" from each chip module end to free the top module from the bottom, be careful not to cut into the SRAM/RTC chip below, or to cut the 4 wires (2 each end) from the lower chip - we need those!

  5. Fluke Hydra 2620A 2025A ERROR 6 caused by dead potted RTC battery - Replacement, clean up epoxy from chip to expose 4 terminals: passo 5, imagem 1 %32
    • At this point, you'll have the top module removed, and there will be two short wires sticking up at each end that we'll need to use. Excess epoxy stuck to the short wires can be crushed and removed with the nippers or pliers.

  6. Fluke Hydra 2620A 2025A ERROR 6 caused by dead potted RTC battery - Replacement, extract cylindrical crystal from top module: passo 6, imagem 1 %32 Fluke Hydra 2620A 2025A ERROR 6 caused by dead potted RTC battery - Replacement, extract cylindrical crystal from top module: passo 6, imagem 2 %32
    • Now we need to extract the crystal from the potted unit we sawed off. Tile nippers and small nibbles work great for this, be sure not to crush the cylindrical crystal (potted on left side in pic), no worries about the battery (right side) which was already toast, which is what brought us here.

  7. Fluke Hydra 2620A 2025A ERROR 6 caused by dead potted RTC battery - Replacement, Solder crystal and pigtail wires to chip: passo 7, imagem 1 %32
    • Solder the extracted crystal on the right side two pins (this runs the real time clock in the chip below), and solder two pigtails onto the left side for battery holder (next step). (Top left=-3V, Bot left=+3V on coin cell holder). Crystal on right is not polarized.

    • You can verify battery polarity by checking that the "Gnd -3V" pin on the photo is a few ohms to a GND test pin on the circuit board.

  8. Fluke Hydra 2620A 2025A ERROR 6 caused by dead potted RTC battery - Replacement, final - install battery clip and battery: passo 8, imagem 1 %32 Fluke Hydra 2620A 2025A ERROR 6 caused by dead potted RTC battery - Replacement, final - install battery clip and battery: passo 8, imagem 2 %32
    • Solder short (~1.5") pigtail wires onto the SMT 16mm coin cell socket (digikey BU1632-JJ-GCT-ND or equiv), then solder those leads onto the sticky-up chip leads you freed in the previous step, use superglue gel to glue down the socket and crystal

    • Note polarity on socket: double check that socket "-" terminal you wired to the sticking up IC pin is also electrically connected to GND of circuit board.

    • install battery (CR1620 for example). Verify it all works by setting the date/time, which is done by pressing "SHFT" then "INTVL" and using the up/down arrow buttons and left/right and ENTER for YYYY MMDD and HHMM. Turn instrument off for a bit then power on and check it remembered those settings and ERROR 6 no longer appears.

Conclusão

Re-install any cables and circuit boards you removed, after testing and verification, slide the outer shell back (with 3 or 4 flat head screws depending on model) on and the rear bezel (2 screws)

Uma outra pessoa concluiu este guia.

Jay Chesavage

Membro desde: 01/13/16

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