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dm38
Table of Contents
Important Safety Instructions .................................................................... 2
Introduction..................................................................................................... 3
Installation....................................................................................................... 4
Unpacking................................................................................................. 4
Positioning ................................................................................................ 5
Connections..................................................................................................... 5
Connecting the Mains Supply Cable................................................... 5
Connecting the Loudspeakers .............................................................. 5
Connecting the External Ground ......................................................... 6
Bridging..................................................................................................... 6
Running-in period................................................................................... 6
dm38 Input Selections ............................................................................ 6
Comments on the different dm38 inputs ........................................... 7
Operating Instructions ................................................................................. 8
Electronic Protection and Reliability........................................................ 9
Specifications for the dm38....................................................................... 13
Care and Maintenance................................................................................ 14
Troubleshooting........................................................................................... 15
Service............................................................................................................. 16
Warranty......................................................................................................... 17
Warranty Registration Form ..................................................................... 18
TM
Page 1
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Summary of Contents for Halcro DM38
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Page 1: Table Of Contents
Connecting the External Ground ............6 Bridging..................... 6 Running-in period................... 6 dm38 Input Selections ................6 Comments on the different dm38 inputs ........... 7 Operating Instructions ................. 8 Electronic Protection and Reliability............9 Specifications for the dm38............... 13 Care and Maintenance................14 Troubleshooting................... -
Page 2: Important Safety Instructions
The dm38 is produced in two models designed to operate on different main power supplies. 110V model (Halcro item 411-005): 100 - 120V, 45-65Hz 240V model (Halcro item 411-006): 220- 240V, 45-65Hz The Amplifier’s Positive Loudspeaker Terminal can generate... -
Page 3: Introduction
Please enjoy the HALCRO™ audio experience. HALCRO™ has enjoyed creating perfect audio reproduction for the world's music connoisseurs. If you desire to contact HALCRO™ to give us feedback on your purchase or for general enquiries; please feel free to: email us at admin@halcro.com... -
Page 4: Installation
Installation Ensure you have read the Important Safety Instructions section on page 2, prior to installing your HALCRO™ amplifier. If you require assistance in the unpacking and installation of your HALCRO™ amplifier, please contact your dealer. PLEASE NOTE: When lifting the unit, always use two people. -
Page 5: Positioning
Positioning We suggest that the dm38 be positioned as near to your loudspeakers as practical. This will reduce the length of the loudspeaker cable required. The sides of the unit house the heatsinks that are used to dissipate heat. The airflow to these should not be interrupted. -
Page 6: Connecting The External Ground
Connecting the External Ground The dm38 is equipped with a separate ground terminal. The ground terminal has a green bezel and is located under the power supply. This terminal may be used to reduce hum and ripple in some circumstances. -
Page 7: Comments On The Different Dm38 Inputs
Comments on the different dm38 inputs The balanced voltage input or current-mode inputs are most desirable for minimizing earth loop generated mains hum and ripple, or high frequency interference. Sources with current-mode outputs are rare and are most likely to have an RCA output socket. -
Page 8: Operating Instructions
It is recommended that the unit be switched to standby when not in use. It is safer to turn the mains power off when not using the dm38. However the amplifier may be left on in the standby mode for prolonged periods. If you wish to turn the mains power off, the amplifier has a very minimal warm up period. -
Page 9: Electronic Protection And Reliability
Our components are selected for not only performance but reliability as well, for example: All Halcro electrolytic capacitors are rated at a minimum of 105 degrees C instead of the usual 85 degree rating. The operational life of electrolytic capacitors is severely shortened at temperatures near the maximum temperature rating. - Page 10 Output current limiting In terms of maximum available output current, there are basically 3 amplifier type options: a. An amplifier with a reasonable limit placed on the maximum available output current. b. An amplifier with no limit placed on the maximum available output current, which will either blow a fuse or self destruct if excessive current is drawn, for example through a dead short.
- Page 11 Output transistor protection Halcro uniquely incorporates circuitry which accurately calculates the mean power dissipated in the power output transistors (power FETs). Another calculating circuit then may reduce the maximum available output current according to the heatsink temperature and calculated average dissipated power in the transistors.
- Page 12 Unusual output conditions The vast majority of amplifier faults show up as high positive or negative d.c. output voltages. An independent circuit in the Halcro amplifiers senses any unreasonable d.c. output voltage and switches the amplifier off if this occurs.
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Page 13: Specifications For The Dm38
Specifications for the dm38 PROTECTION THE AMPLIFIER PROTECTION: POWER Is short-circuit proof Power output into 4ohms resistive > 350W Has over current limiting Power output into 8ohms resistive > 180W Will cut out if temperature is excessive DISTORTION (Footnote 1). -
Page 14: Care And Maintenance
Care and Maintenance The HALCRO™ dm38 has been designed for indoor use only. Under no circumstances should the amplifier be allowed to get wet. The only maintenance required will be ensuring the unit is kept clean. Important HALCRO™ takes no responsibility for any damage caused through careless or improper cleaning techniques. -
Page 15: Troubleshooting
Troubleshooting The HALCRO™ dm38 contains no user serviceable parts inside the compartments. Please do not attempt to open the unit as this will void the warranty and will expose you to dangerous voltages. For all service requirements please contact your dealer, or HALCRO™... -
Page 16: Service
Service The HALCRO™ dm38 has been designed for maximum reliability. If a problem does occur with your unit, please contact your dealer. Contact your dealer to help you with some troubleshooting prior to organizing service for your amplifier. Your dealer or HALCRO'S service department will always try to help you correct any basic problems at your home via email or telephone. -
Page 17: Warranty
IMPORTANT - Please read the following details very carefully The dm38 is warranted to be free of defects if used under normal conditions for a period of ninety (90) days from the date of purchase. To extend the warranty period to five (5) years, please complete and return the warranty registration form. -
Page 18: Warranty Registration Form
Warranty Registration Form One form must be completed for every amplifier. Title…………… First name………………………….. Surname……………………… ........Address………………………………………………….………………………………… ..…………………………………………………………………….…………………………..Zip or post code………………………Country………………………………………... Date of Birth Day………..Month………….Year………….. Phone numbers Home (……)…………………….. Work (……)…….……………... . Facsimile numbers Home (……)………………… Work (……)……..……………….