AudioResearch-VSI55-int-adj 电路图 维修手册.pdf

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1、Muting Provisions The VSi55 has several provisions to help protect against misuse of the exceptional dynamic range and wide band- width that it offers. It is not subject to damage itself, but some speakers are more limited in their ability to with- stand signal extremes. These provisions, both manua

2、l and automatic, are designed not to interfere with the listening experience, while giving reasonable protection against warm-up surges and power line interruptions. However, for absolute protection of associated equipment some operator understanding and responsibility are required. Initial “s e t t

3、 l i ng” time of all circuit parameters within the VSi55 requires approximately 5 to 10 minutes. The au- tomatic muting circuitry timer is adjusted for about 30 seconds. (This is because recurrent interruption “s e t t l i ng” time is much less. You would not want to wait for 5 to 10 minutes each ti

4、me such an interruption occurred.) The Mute/Operate switch allows manual disabling of the VSi55 inputs during the switching of equipment. Use of this switch will minimize stress on your VSi55 and other components. It is also highly recommended that manual muting be employed during turn-off for maxim

5、um protec- tion. The automatic muting operates as follows: 1. The automatic muting always disables all inputs and overrides any manual settings. (The “O p e r a te” position of the manual Mute switch is functional only when the unit is not in the automatic mute mode.) Not e : Power supply regulation

6、 of the VSi55 is effective down to 100VAC (120V units) without serious sonic degradation. 2. The automatic muting of the VSi55 is designed to be effective only against power line interruptions and power line failures. It will not mute against subsonic signal transmissions from your input source. Pro

7、per fusing of speakers is essential to protect against excessive audio signal levels. Servicing Because of its careful design and exacting standards of manufacture, your VSi55 amplifier should normally require only minimal service to maintain its high level of perfor- mance. C A U T I O N: The VSi55

8、 integrated amplifier contains suffi- cient levels of voltage and current to be lethal. Do not tam- per with a component or part inside the unit. Even with the power turned off, a charge remains in the energy stor- age capacitors for some time. Refer any needed service to your authorized Audio Resea

9、rch dealer or other qualified technician. The vacuum tubes in your VSi55 should not need to be changed for approximately 2000 hours of use. Replacement vacuum tubes should be of equivalent quality and are avail- able through your authorized retailer or directly from Audio Research Customer Service.

10、For best performance, the 6550EH output tubes should be matched pairs. Additional questions regarding the operation, maintenance or servicing of your amplifier may be referred to Audio Research Customer Service at (763)-577-9700.(CST) Output Tube Bias Adjustment As shipped from the factory, the outp

11、ut “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 “enriched” Class AB1, and will satisfy the most critical listener

12、. For best results, operate and adjust the VSi55 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 measurements with 0.lmVDC resolution is preferred for accurate adjustment (must h

13、ave 31/2digit display). Use the plastic alignment tool provided to make the adjustment. The measurement points are banana test jacks at the rear of the VSi55. Adjust the “bias” for an average voltage reading of 65mVDC (.065 Volt DC) between test jacks, four places. Cleaning To maintain the new appea

14、rance of this unit, occasionally wipe the front panel and top cover with a soft, damp (not wet) cloth to remove dust. A mild, non-alkaline soap solu- tion or dilute isopropyl alcohol may be used to remove fingerprints or similar smudges. Cleaners containing abra- sives should notbe used as they will damage the anodized finish of the front panel. A small, soft paint brush is effec- tive in removing dust from bevels, the recessed nameplate and other features of the front panel. Model VSi55 4 VSi55 Manual / 3-03 / 2-17-03 RadioFans.CN 收音机爱 好者资料库