Manley ELOP+ Owner's Manual
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9!Q: No Power, No Indicators ?Ensure the IEC plug at the rear of the unit is inserted allthe way. Wait at least five minutes before trying the powerswitch again. If the unit does not power up then check thefuse on the PSU. (See Servicing, Diagram 3)Q: The Unit Is Switched On, No Sound ?First try plugging the IN and OUT cables into some otherpiece of gear to verify that your cables are OK. Next checkthe front panel, try BYPASS. If you have sound now it mightbe a good idea to turn up the output levels to about 1o’clock (rather than fully counterclockwise which is “minusinfinity”.Q: Levels Seem To Be Wrong, No Bottom ?Several possible scenarios. Manley uses the professionalstandard of +4 dBm = Zero VU = 1.23 volts AC RMS. A lot ofsemi-pro gear uses the hi-fi reference of -10 dBm = ZeroVU. This is a 14 dB difference that will certainly look oddand may tend to distort. Often there are switches on semi-pro gear to choose the pro reference level. We do notprovide that kind of switch because of inevitablecompromises in the signal path. If the loss looks close to 6dB and it sounds thin then one half of the signal is lost. Thecause is probably wiring again. One of the two signalcarrying wires (the third is ground / shield on pin 1) is nothappening. Check the cables carefully because occasionallya cable gets modified to work with a certain unit and itseems to work but its wrong in other situations. If only oneside of the ELOP+ exhibits this problem, it may be aproblem in the unit itself.Q: Only One Channel Is Functioning ?This may be due to a faulty tube. This is a two channelunit, meaning you can swap tubes to determine the faultytube. Switch one tube at a time, ensuring you place thecorrect tube in the correct base. You can swap VT1 Leftwith VT1 Right. Do not put VT1 in VT2. The 5751 and 6922tubes have different pin connections. Leave the unitswitched off for at least 15 minutes before removing anycovers. If upon examination you see a white topped tubeinstead of a silver top, this tube is likely to have crackedits glass envelope, fracturing the vacuum, this tube willneed to be replaced.Q: How Can I Cure Low Frequency Hum?Method 1- The most likely cause is a ground loop. This canbe cured by lifting the chassis to signal ground lift jumperswhich are located inside the unit. Please refer to theServicing Chapter, Diagram 3.Method 2 - Cutting the shield on one side of the cable (PIN1). This is done by some studios at every female XLR to“break” all loops. You may get a loop simply from therack. All the other gear in the rack is “dumping” groundnoise onto the rack rails. Try removing the ELOP+ from therack so that it is not touching any metal. You may havecured a non-loop hum. Some gear radiates a magnetic fieldand some gear (especially if it has transformers) mightreceive that hum. The unit would have to physically bemoved away from any highly radiating power supply inorder to cure this type of induced him.7. Questions & TroubleshootingMethod 3 -Another method of reducing all sorts of hum andnoise is to use a 60-0-60 balanced AC power transformer.Hum is more likely with the unbalanced inputs and outputsbecause these signals are ground referenced. A commonsituation is using the ELOP+ in a way that significantlyboosts the low level signals and what may have started outas a little hum becomes nasty. Check out the gear feedingthe ELOP+ or use less limiting and make-up gain.Q: Why is my ELOP+ Not Completing its Power-Up Cycle?The ELOP+ utilizes a custom designed, sophisticated highvoltage switched-mode power supply. This power supplyfeatures protection circuitry to stop any damage beingcaused to itself. If at anytime the unit will not power-upthe protection circuitry may have been triggered. It is inprotection mode if after switch-on the power LED blinks fora fraction of second then after a pause it blinks again. ThePSU is now in protection mode as the supply is trying toreset. This condition will occur if the unit suffers excessiveheat exposure or there is a damaged tube or component.Allow the unit to cool and try powering-up again. If theprotection mode persists, the unit will have to be returnedfor service.Q: ELOP+ Makes Noises When The Front Panel Is Tapped?Some tubes become microphonic over time. That meansthey start acting like a bad microphone. Vibration and aginghas caused the supports for the small internal parts in thetube to loosen and now the tube is sensitive to vibration.The only remedy is to replace the tube.Q: I am Hearing a lot of Hiss?This is again a common tube symptom. You could swaptubes to find the culprit but an educated guess is OK too.Generally the first tube in the path is the one with the mostgain and dealing with the softest signals. VT1 (5751) is thefirst tube in the signal path. (See Servicing Chapter,Diagram 3)Q: ELOP+ Sounds Distorted?This might be a tube. Swapping is a good way to find out. Itmay be a wiring issue or mismatch. Wiring problems usuallyaccompany the distortion with a major loss of signal.Mismatches are a bit tougher. The ELOP+ has a high inputimpedance (HI Z) but some gear has a reasonably low inputimpedance. Without even explaining the term “impedance”it is enough to say that a lot of gear is simply not capable ofdriving pro levels and low impedances. It will sound like lostheadroom, early clipping, distortion on peaks. Oftenchanging the order of processors will do the trick. Alsocheck your patch bay in case there is a problem there too. |
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