Instruction/ maintenance manual of the product 901 Microplane
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Model 901 HEADPHONE AMPLIFIER OWNERS MANUAL PO Box 204 Boulder, CO 80306 tel: 303.443.7454 fax: 303.444.4634 email: info@gracedesign.com web: www.grace design.
1 Thank you for purchasing the Model 901 headphone amplifier . It is designed to be completely reliable and easy to use . However, we as k that you take the time to familiarize yourself with some of the more important operation instructions in this manual to avoid most co mmon user problems.
2 FRONT PANEL CONTROLS LEVEL CON TROL The 901 level control is assembled with an ultra precision 24 position gold contact switch. Using low inductance surface mount metal film resistors this s witch is the ultimate attenuator for sonic fidelity and level accuracy.
3 INPUT SELECT This switch selects the input source. With the switch out the analog inputs are selected. XLR balanced and RCA unbalanced conn ectors are provided on the rear panel. When the INPUT SELECT switch is depressed the digital inputs are selected.
4 REAR PANEL CONTROLS AC INLET The 901 accommodates a standard IEC power cable. The IEC inlet contains a built in RFI filter. LINE VOLTAGE SELEC TOR To change the line voltage use a small screwdriver to pry open the voltage select door. Carefully remove the voltage select cam and insert with the desired voltage showing.
5 ANALOG INPUTS The 901 provides both balanced and unbalanced inputs. Input connections are made using the female XLR connector on the rear panel. These connector s are wired with pin 2 positive, pin 3 neg ative and pin 1 ground . The unbalanced phono type jacks are wired in parallel with pin 2 of the XLR balanced jacks.
6 NOISE FLOOR 0dB gain, 22 - 22kHz - 95dBu 0dB gain, A - weighted - 102dBu POWER REQUIREMENTS 115VAC .16A 230VAC .08A.
An important point after buying a device Microplane 901 (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Microplane 901 yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Microplane 901 - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Microplane 901 you will learn all the available features of the product, as well as information on its operation. The information that you get Microplane 901 will certainly help you make a decision on the purchase.
If you already are a holder of Microplane 901, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Microplane 901.
However, one of the most important roles played by the user manual is to help in solving problems with Microplane 901. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Microplane 901 along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
