| Electronics > Repair |
| HP 53310A - Power supply troubles |
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| kj7e:
--- Quote from: m3vuv on December 05, 2021, 11:19:32 am ---dont you think im already doing that?,how about you read the question i asked before posting FFS!! --- End quote --- Well, with that attitude, good luck to you sir. |
| Cubdriver:
Th PS on mine has failed as well; it appears that the usual suspects (based on this thread) have been piddling on the board. To add yet another date point to the thread: HP silkscreen: Hewlett Packard P/N 0950-1879 Manufacturer's part label: Computer Products XL131-3604E 115/230VAC 220W 50/60HZ CSA LR50913 Manufacturer's serial label: P/N: 700040-01 S/N: HHQ 7072 REV: P DATE: 9143 Agency label: (None) Written on PCB: "79001P REV. P" Silkscreened on heat sink end of PCB: "ASSY NO 700040-01 REV" (No rev marking present) Soldermask marking on back side of board behind T3: "MC1368B 94V-0 MULTI" Soldermask marking on back side of board near (8) 1000 uF caps and near L4/L6: "510040 REVD ©1987 9130 PCB information: "COMPUTER PRODUCTS BOSCHERT INC" Date code 9118 on Q3 transistor in power supply. No RIFA yellow capacitors. ALL 1000 uF, 35 V caps exhibit signs of leakage, with corrosion on board. Remaining caps do not appear to be leaking, but will be replaced regardless. -Pat Edit to add - many thanks to KJ7E for the comprehensive BOM - it was most helpful in getting the replacement caps ordered. Kudos to you, sir! |
| m3vuv:
I did make up a lead and fitted a pc atx psu in mine,it sort of half worked but had lots of self test fails,if i remember the 5v rail sagged to about 3.5v,maybe a higher wattage supply would of worked,in the end i recapped the original psu and fitted a metal push button switch on the side of the scope to turn it on or off,i think the people who designed this were on mind altering drugs putting the on off switch at the rear of the unit,crappy design. |
| Tomorokoshi:
I finally got around to updating the capacitors. I used kj7e's list. I had been repairing something else, and it had been a while since I used the 53310A, so of course I got all kinds of failure codes and information when I turned it on. There was less and less for the next couple power cycles, so it was clear that it was time to check it. First I removed the power supply and I connected to the 20-pin output connector to monitor all the voltages. I started with a 40W bulb for the dim-bulb limiter, but I had to switch to 60W. A few were low, and after a couple power cycles it got worse and worse. If I recall one of the 12V rails was having the most trouble. I tried to measure capacitance at the output connectors, but my LCR meter could not settle on a reading. I ordered the parts from Digi-Key, so in the meantime I removed the old capacitors. Several were leaking and I cleaned up the electrolyte as I could. I only delaminated 3 or 4 solder pads on the top of the board, and none of the tracks delaminated. None of the tracks were corroded enough to require repair. After installation of the new capacitors I ran it on the bench and monitored all the outputs. It wouldn't run with a 60W bulb, so I switched to 300W. That almost worked, so I ran 60W and 300W in parallel, and that worked. All the outputs were fine, so I reassembled the machine and ran the self-test. All tests are fine, although note that the oven takes a while to heat up enough to pass. Here are the measurements of both the old and the new capacitors out of circuit. Most were measured at 1000 Hz. The large values were also measured at 100 Hz. Note: The list from kj7e calls out one of the 2200 µF as C25, while I list it here as C42. The designations on the board are ambiguous in that area. Ref f (Hz) C (µF, old) D (old) Θ (°, old) C (µF, new) D (new) Θ (°, new) C7 1000 866 0.5 -63.4 857 0.386 -68.8 C8 1000 879 0.514 -62.8 851 0.378 -69.2 C9 1000 827 0.47 -64.8 849 0.377 -69.3 C10 1000 856 0.48 -64.3 863 0.373 -69.5 C11 1000 862 0.487 -64 853 0.366 -69.8 C12 1000 850 0.489 -63.9 859 0.367 -69.8 C13 1000 872 0.501 -63.4 861 0.358 -70.3 C14 1000 841 0.477 -64.5 856 0.36 -70.2 C15 1000 851 0.52 -62.5 864 0.359 -70.2 C16 1000 836 0.508 -63 860 0.348 -70.8 C17 1000 355 0.732 -53.8 451 0.205 -78.4 C19 1000 23 2.42 -22.3 43 0.097 -84.4 C22 1000 596 0.408 -67.8 569 0.395 -68.4 C23 1000 600 0.422 -67.1 583 0.37 -69.6 C26 1000 5402 3.27 -17 6414 2.51 -21.7 C26 100 5471 0.384 -69 6283 0.276 -74.6 C27 1000 5203 2.73 -20.1 6652 2.53 -21.6 C27 100 5479 0.329 -71.8 6457 0.276 -74.6 C30 1000 880 0.508 -63 869 0.358 -70.3 C31 1000 826 0.476 -64.5 856 0.351 -70.6 C32 1000 897 0.476 -64.5 861 0.354 -70.5 C33 1000 908 0.475 -64.5 856 0.35 -70.7 C34 1000 190 0.448 -65.8 219 0.099 -84.4 C35 1000 163 0.673 -56 232 0.097 -84.4 C36 1000 177 0.462 -65.2 218 0.097 -84.4 C37 1000 159 1.1 -42.4 219 0.095 -84.5 C38 1000 179 0.536 -61.8 222 0.097 -84.4 C39 1000 190 0.465 -65.1 216 0.101 -84.2 C40 1000 1406 1.93 -27.3 1929 0.711 -54.5 C40 100 1820 0.355 -71.1 1990 0.091 -84.7 C41 1000 1292 2.06 -25.8 1870 0.679 -55.8 C41 100 1760 0.408 -67.7 1920 0.086 -85 C42 1000 1674 1.66 -31 1923 1.41 -54.7 C42 100 1900 0.213 -77.9 1990 0.095 -84.5 C49 1000 5219 2.33 -23.2 6167 2.12 -25.3 C49 100 5367 0.275 -74.6 6345 0.252 -75.9 C50 1000 190 0.476 -64.5 215 0.1 -84.2 |
| artag:
I haven't needed to do this yet but I appreciate the thorough measurements. Useful to get an idea of the health of other units if no leakage is apparent. What LCR meter did you use ? |
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