Allen_&_Heath_GL2000_Mixer_Service_Manual电路图.pdf

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1、 ALLEN&HEATH WARNING HIGH VOLTAGES Power Supply Unit (PSU) work should only be carried out by qualified personnel. We recommend that you use an approved Allen & Heath service centre for all power supply work. Please contact your local Allen & Heath distributor for more details. http:/www.allen- Radi

2、oFans.CN 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 ALLEN & HEATHSection C - 1L2dSM2 C CAUTION ! TO AVOID DAMAGE TO INTERNAL COMPONENTS BY MISHANDLING AND/OR MISCONNECTION, ONLY TECHNICALLY COMPETENT PERSONNEL SHOULD ATTEMPT SERVICE WORK ON THIS UNIT. ANY SERVICE WORK SHOULD BE UNDER

3、TAKEN ONLY AFTER DISCONNECTING THE MAINS SUPPLY LEAD FROM THE POWER SUPPLY UNIT. POWER SUPPLY SECTION C ALLEN & HEATHSection C - 2L2dSM2 Check that the voltage indicated in the fuseholder window is the same as the mains supply in your area. ? ? AC mains supply = 100 to 110 V.AC100T 1.6A20mm fuse AC

4、mains supply = 110 to 125 V.AC120T 1.6A20mm fuse AC mains supply = 210 to 230 V.AC230T 630mA20mm fuse AC mains supply = 235 to 260 V.AC240T 630mA20mm fuse To avoid the risk of fire replace the fuse only with the correct type and value as specified on the unit. ? Always switch the unit off before con

5、necting or disconnecting the console power cable. TECHNICAL DESCRIPTION The power supply for the GL2000 range is internal to the console and is mounted on a steel sub-chassis. INSTALLATION An important consideration when positioning the console is the need for natural convection of air flow over the

6、 whole unit. Good ventilation, in the floor and back of the console, will ensure a path for continuous air flow. Pay particular attention to the ventilation around the power supply unit which is mounted off the rear connector panel. The GL2000 can be operated as a free standing unit without requirin

7、g any special cooling arrangement, but should not be covered in any way. Always stand the unit on a firm flat surface well away from any soft furnishings. THE POWER SUPPLY AND CONSOLE EARTHING The GL2000 power supply is a linear power supply which, like other linear supplies, produces DC voltages by

8、 rectifying, smoothing and regulating AC voltages from the secondary windings of a mains transformer. The console connects directly to the local AC mains supply and provides the regulated DC operating voltages required by the GL2000 console. The console chassis is always connected to mains earth. Au

9、dio 0V connects to the console chassis internally. Should problems be encountered with ground loops operate the audio ground lift switches on other equipment connected to the console or disconnect the cable screens at one end. Refer to the section on EARTHING in the User Guide. This is to avoid eart

10、h loops in situations where multiple earth paths are present. THE CHASSIS METALWORK IS ALWAYS CONNECTED TO MAINS EARTH VIA THE EARTH WIRE IN THE MAINS PLUG. DO NOT REMOVE THE EARTH WIRE CONNECTION IN THE MAINS PLUG ! CONNECTING AC MAINS TO THE CONSOLE Mains input to the GL2000 is via a standard 3 pi

11、n IEC mains input connector. A mains cable with moulded mains plug suitable for the local supply is supplied. ALLEN & HEATHSection C - 3L2dSM2 SPECIFICATION AC MAINS INPUT:100V, 110V, 120V, 220V, 230V or 240V 50Hz to 60Hz single phase POWER CONSUMPTION:60VA DC OUTPUT:+48V 100mA, +/- 16V 0.8A per rai

12、l. (GL2000-424) NOISE & RIPPLE: 2mV max (peak to peak) SERVICE ACCESS Any fault condition, with the exception of simple mains fuse failure due to underrating or an unusual mains input condition, will require removal of the base cover to enable correction of the fault. This is achieved using a cross-

13、head screwdriver to remove all of the base screws which are positioned along the edges of the base. Do not forget to remove the two screws in the centre rear of the base. Carefully lift the cover and place it to one side. The power supply sub chassis can then be removed by unsrewing the 2 mounting s

14、crews (A) in the console rear panel and the 2 fixing screws (B) in the sub chassis base next to the PSU circuit board. Take care not stretch the wires connected to the console. Servicing Components All of the regulators are in TO220 packages. To replace them, it will be necessary to remove the power

15、 supply circuit board assembly with the heatsink attached. Refer to the L2D PSU assembly diagram 002-150. 1.) Remove the 4 PCB mounting nuts (C) and 2 heatsink fixings (D). 2.) Carefully lift the heatsink and PCB assembly clear of the PSU sub chassis and unscrew the screw and nut of the regulator IC

16、 that requires replacing. Take care to retain the small insulating bush beneath the head of the screw and the insulating SIL pad under the regulator. 3.) Rotate the assembly to gain access to the solder side of the PCB and desolder the three terminals attached to the regulator. The regulator can now

17、 be removed. 4.) Fit the replacement regulator by first fixing it to the heatsink using the screw and nut and then soldering the three terminals to the circuit board. Make sure the insulating SIL pad and bush are fitted. The metal tab at the top of the package is electrically connected to the centre

18、 lead and correct insulation is essential. If the insulating SIL pad between the regulator and the heatsink looks damaged then it should be replaced before installing the new regulator. Note that the regulators rely on good thermal contact with the heatsink to dissipate heat, and this is provided by

19、 the SIL pad. 5.) Reassemble the circuit board and heatsink assembly into the power supply sub chassis. Check your work and remove any debris from the sub chassis before refitting it to the console. CAREFULLY CHECK ALL WIRING CONNECTIONS AND ENSURE THAT THERE ARE NO LOOSE PARTS LYING AROUND INSIDE THE CONSOLE. console inverted with the base removed A A B C C D B D