AudioResearch-Reference110-pwr-adj 电路图 维修手册.pdf

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1、Output Tube Bias Adjustment As shipped from the factory, the output “bias” adjustments are set for a nominal 65mA per 6550 tube. Under these idle conditions the tubes are each dissipating approximately 27 watts of their 48 watt rating (42 watt plate, 6 watt screen). This point of operation provides

2、“enriched” Class AB1, and will satisfy the most critical listener. For best results, operate and adjust the Reference110 at 120VAC. Adjustment must be made under zero-signal conditions after at least 15-20 minutes of uninterrupted stabilization time. A digital voltmeter capable of accurate measureme

3、nts with 0.lmVDC resolution is preferred for accurate adjustment (must have 31/2digit display). Use the plastic alignment tool provided to make the adjustment. The measurement points are yellow and black banana test jacks next to each output tube. Adjust the “bias” for a voltage reading of 65mVDC (.

4、065 Volt DC) at the blue bias pot for one of each output tube pair as follows, noting the voltage setting of the larger V number tube in each pair is slaved to the adjustment setting of its lower V number companion tube: Adjust V5 for 65mVDC and measure its companion tube V7 to verify a reading of 5

5、7 to 73mVDC. Repeat procedure by adjusting and measuring V9 to read 65mVDC and verify V11 reads 57-73mVDC; adjust and measure V6 to read 65mVDC and verify V8 reads 57-73mVDC, and finally adjust and measure V10 to read 65mVDC and verify that V12 reads 57-73 mVDC. Cooling Fan Speed Adjustment The two

6、D.C. cooling fans located at the rear of the Reference 110 are adjustable in speed. Locate the red colored dip switch under the top cover at the top near the center of the back panel. For highest fan speed move both white tabs on the red dip switch to the upward position; for medium fan speed move e

7、ither one of the tabs to the downward position, and for low fan speed move both tabs to the downward position. For maximum cooling and extended tube life, use the highest fan speed possible. Be sure to first turn off and unplug the Reference 110 from its power receptacle before unscrewing the top co

8、ver to access the switch. Refasten the top cover before resuming operation. Do not operate the Reference 110 with fans disconnected or if one or both fans should stop running. Hour Meter An LCD hour meter of elapsed tube operating time can be viewed through the top cover near the front, mounted on t

9、he right main circuit board. Displays accumulated hours of vacuum-tube service life. If the amplifier is unplugged from A.C. supply, total accumulated hours are retained. May be reset by qualified technician. Contact Audio Research Cus- tomer Service for more information about reset procedure. Servi

10、cing Because of its careful design and exacting standards of manufacture, your Reference 110 amplifier should normally require only minimal service to maintain its high level of performance. CAUTION: The Reference 110 amplifier contains sufficient levels of voltage and current to be lethal. Do not t

11、amper with a component or part inside the unit. Even with the power turned off, a charge remains in the energy storage capacitors for some time. Refer any needed service to your authorized Audio Research dealer or other qualified technician. Additional questions regarding the operation, maintenance

12、or servicing of your amplifier may be referred to the Customer Service Department of Audio Research Corpora- tion at 763-577-9700 (CST). When ordering a service manual from Audio Research or an authorized dealer, be sure to identify the serial number on your amplifier. Cleaning To maintain the new a

13、ppearance of this amplifier, occasion- ally wipe the front panel and top cover with a soft, damp (not wet) cloth to remove dust. A mild, non-alkaline soap solution may be used to remove fingerprints or similar smudges. Cleaners containing abrasives should notbe used as they will damage the anodized

14、finish of the front panel. A small, soft paint brush is effective in removing dust from bevels, the recessed nameplate and other features of the front panel. Disposal and Recycling Guidelines To dispose of this electronic product, do not place in land- fill. In accordance with the European Union Was

15、te Electri- cal and Electronic Equipment (WEEE) directive effective August 2005, this product may contain regulated materials which upon disposal require special reuse and recycling processing. Please contact your dealer or importing distributor for instructions on proper disposal of this product in your country. Or, contact Audio Research Corporation (763-577- 9700) for the name of your importing distributor and how to contact them. Packing and shipping materials may be disposed of in a normal manner. Model Reference 110 4 RadioFans.CN 收音机爱 好者资料库