Denon DVM 1845 Service Manual
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Page 1
heed the points listed below during servicing and inspection. ention when servicing, such as tc., have cautions indicated on ed these cautions and the cau- g instructions. g electric shock! ed on this set, so touching inter- set is energized could cause o avoid electric shock, by for ex- transformer and gloves when nergized, unplugging the power , etc. s inside. Handle with extra care sassembly and assembly! when manufacturing parts from me rare cases be burrs on the ause injury if fingers are moved rotect your hands. ed parts! c safety properties (fire resis- c.). For replacement parts, be the same properties. In particu- rts that are marked ! on wiring ure to use the designated parts. parts and arrange the originally! ts use tape, tubes or other insu- rts are mounted away from the rds. Care is also taken with the and clamps are used to keep high voltage parts, so be sure to originally. Õ Inspect for safety after servicing! Check that all screws, parts and wires removed or discon- nected for servicing have been put back in their original posi- tions, inspect that no parts around the area that has been serviced have been negatively affected, conduct an insulation check on the external metal connectors and between the blades of the power plug, and otherwise check that safety is ensured. (Insulation check procedure) Unplug the power cord from the power outlet, disconnect the antenna, plugs, etc., and turn the power switch on. Using a 500V insulation resistance tester, check that the insulation re- sistance between the terminals of the power plug and the ex- ternally exposed metal parts (antenna terminal, headphones terminal, microphone terminal, input terminal, etc.) is 1M or greater. If it is less, the set must be inspected and repaired. Concerning important safety parts Many of the electric and structural parts used in the set have special safety properties. In most cases these properties are difficult to distinguish by sight, and using replacement parts with higher ratings (rated power and withstand voltage) does not necessarily guarantee that safety performance will be pre- served. Parts with safety properties are indicated as shown below on the wiring diagrams and parts lists is this service manual. Be sure to replace them with parts with the designat- ed part number. (1) Schematic diagrams ... Indicated by the ! mark. (2) Parts lists ... Indicated by the ! mark. Using parts other than the designated parts could result in electric shock, fires or other dangerous situations. o the cus tomer, ma ke sure you ma ke e ither (1) a lea kage curren t check or (2) a line to c hass is kage current exceeds 0.5 milliamps, or if the resistance from chassis to either side of the power s, the unit is defective. O N and invisible laser radiation when open. tical instruments. CAUTION±Ïµz :UÌtxmWw\qt] «™&M‡b{ Õ «™Äò›S Xi^M‚
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3 DVM-1845/745 SPECIFICATIONS Notes: 1. All Items are measured without pre-emphasis unless otherwise specified. 2. Power supply: AC 120 V, 60 Hz 3. Load Impedance: 100 k load (Audio Output) 4. Room Ambient: 5 °C - 40 °CItem Conditions Unit Nominal Limit 1. Video Output 75 load Vpp 1.0 ± 0.1 2. Optical Digital Out dBm -18 3. Audio (PCM) 3-1. Output Level 1 kHz, 0 dB Vrms 2.0 3-2. S/N dB 120 3-3. Freq. Response DVD fs = 48 kHz, 20 Hz ~ 22 kHz dB ± 1.0 CD fs = 44.1 kHz, 20 Hz ~ 20 kHz dB ± 1.0 3-4. THD+N DVD 1 kHz, 0 dB % 0.004 CD 1 kHz, 0 dB % 0.004