Instruction/ maintenance manual of the product JC-2 Mark Levinson
Go to page of 12
INSTRUCTION MANUAL for the JC-2 PREAMPLIFIER.
IMPORTANT Please read these instructions carefully and completely before operating the JC-2 preamplifier. A great deal of effort went into the design and construction of this precision device. Understanding its functions will enable you to use it to fullest advantage.
INSTRUCTION MANUAL for the JC-2 PREAMPLIFIER 1. INTRODUCTION The MARK LEVINSON JC-2 PREAMPLIFIER is the distillation of years of scientific research and careful listening.
3.2. Power Supply Connection The power supply for the JC-2 is mounted in a separate chassis to eli- minate hum pick-up. Check the voltage the power supply comes a cable with a three power supply label to be sure they correspond to the voltage of the power source being used.
TAPE 1/TAPE 2 - selects either tape input 1 or tape input 2 for the input/ monitor switch. MONO/STEREO - selects either a mono or a stereo mode at the main outputs. HIGH/LOW - selects either 21dB gain (HIGH) or 11dB gain (LOW) in the output stage. Line level inputs should generally be used only with the low gain setting.
UNIVERSAL PHONO PLUG-IN CARDS System: Gain: Overload: 1kHz 20kHz A Two UP-1A cards are normally sup- 36dB 100mv 900mv plied with the JC-2 unless other- wise specified. This system accepts Input impedance: 47kOhms. B The UP-1B system offers lower 30dB 220mv 1.
6. SPECIFICATIONS Phono Section: Gain* 1kHz 36dB OVERLOAD POINT* 1kHz 100mv min. *(see also Section 5) MAXIMUM OUTPUT 18Hz to 20kHZ 6v min. CHANNEL TRACKING 18Hz to 20kHz .5dB ( .2 typ.) FREQUENCY RESPONSE -1.5dB down at 18Hz, 30kHz min. NOISE 18Hz to 20kHz: ASA "A" weighted below 10mv, inputs shorted 85dB 90dB min.
7. WARRANTY All MARK LEVINSON products are guaranteed for five full years from date of purchase. Parts and labor will be furnished free of charge. The manufacture assumes no responsibility for damaged or abused equipment and reserves the right to determine cause of defects.
NEW DEVELOPMENTS IN THE JC-2 JC-2 Preamplifiers starting with serial number 2148 differ from previous units. They are equipped with lemo connectors, a new power supply (PLS-150), two phono inputs and new phono plug-in cards. PHONO SECTION The standard systems are now A3, D5 and d6.
TONEARM CABLE ADAPTOR From an effort to simplify the connection of existing turntables to MLAS Pre- amplifiers fitted with Lemo connectors, we have developed the CA-1 cable adap- tor. The CA-1 is a solid block of aluminum 2X2X .75" machined to exact toler- ances and finished in our standard brushed black anodized surface.
INSTRUCTIONS FOR ASSEMBLING THE CA-1 CABLE ADAPTOR 1. The CA-1 may be mounted to a shelf, cabinet, or turntable base with one wood screw. This keeps fragile tonearm leads from breaking or flexing. 2. Use LL-.6 or LL-3 cables to connect with your JC-2 or LNP-2 preamplifier.
PLS-150 POWER SUPPLY SYSTEM JC-2 preamplifiers with Lemo connectors are equipped with the PLS-150 Power Supply. The PLS-150 Power Supply is considerably larger and heavier than the ones delivered with previous units. We recommend that it be positioned with the cable end facing the wall and the front plate facing forwards.
An important point after buying a device Mark Levinson JC-2 (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Mark Levinson JC-2 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 Mark Levinson JC-2 - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Mark Levinson JC-2 you will learn all the available features of the product, as well as information on its operation. The information that you get Mark Levinson JC-2 will certainly help you make a decision on the purchase.
If you already are a holder of Mark Levinson JC-2, 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 Mark Levinson JC-2.
However, one of the most important roles played by the user manual is to help in solving problems with Mark Levinson JC-2. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Mark Levinson JC-2 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
