darTZeel NHB-108 model one User Manual, version B 1.0 Page 3 of 35Table of contentsFirst Section, User Manual1. Introduction .......................................................................................................52. Brief description ................................................................................................53. The NHB-108 in details......................................................................................63.1. Front Panel ..................................................................................................................................... 63.2. Rear Panel ...................................................................................................................................... 63.3. Top View ........................................................................................................................................ 74. Who am I? ..........................................................................................................85. Connecting and setup.......................................................................................85.1. Important prior notice .................................................................................................................... 85.2. Location ......................................................................................................................................... 85.3. Speaker impedance ........................................................................................................................ 85.4. Choice of the input......................................................................................................................... 95.5. Powering ON ................................................................................................................................. 96. Using the darTZeel ............................................................................................96.1 Power cycle.................................................................................................................................... 96.2. darTZeel's Eyes.............................................................................................................................. 96.3. User parameters ........................................................................................................................... 106.4. Jumper settings............................................................................................................................. 117. Maintenance.....................................................................................................117.1. Fuse(s) replacement ..................................................................................................................... 117.2. DC voltage drift ........................................................................................................................... 137.3. Cleaning and upkeep.................................................................................................................... 138. Some advice and tips......................................................................................138.1. What not to do.............................................................................................................................. 138.2. Troubleshooting ........................................................................................................................... 148.2.1. Eyes Closed.................................................................................................................................. 148.2.2. Blinking Eyes............................................................................................................................... 148.2.3. Amplifier ON, no sound............................................................................................................... 148.2.4. Warped sound .............................................................................................................................. 148.2.4. Sensitive fuses.............................................................................................................................. 148.2.5. Sound too quiet ............................................................................................................................ 158.2.7. Melting Fuse(s) at power ON....................................................................................................... 158.2.8. RAS (Regular And Satisfactory).................................................................................................. 159. Conditions of warranty ...................................................................................159.1. Breakdowns or faulty parts .......................................................................................................... 159.2. Conditions of use ......................................................................................................................... 1610. Assistance .......................................................................................................1611. Technical data..................................................................................................17