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Фрагмент инструкции
No speaker switching is provided on the amplifiers as this invariably will cause some degradation of the signal, however slight. If it is necessary to switch speakers we recommend that the main pair be wired directly to the amplifier wherever possible and that only the ‘extension’ speakers be switched. With both models it is possible to reduce the value of output fuse fitted in the amplifier in order to provide the best protection for both the speaker and amplifier. See page 7 for full details. Heat Sink The heat produced by the SA150 and SA200 is dissipated into the air by the large cast heat sinks whose fins form most of the rear panel. When the amplifier is in use these will run warm and may become quite hot when the unit is run near full power, particularly into low impedance loads. This Is perfectly normal. However, if the fins become too hot to touch switch off the amplifier at once and consult your dealer. N.B. To ensure that the amplifier does not overheat it is important that the natural flow of air over the heat sinks is not obstructed. It is also unwise to place heat sensitive items (such as L.P. records) on top of or immediately above the amplifier. Front Panel Controls Mains Power To switch on the amplifier, depress the power on/off switch located on the extreme right of the front panel until it latches home. The small rectangular LED (light emitting diode) adjacent to the switch should glow green. To turn off the power amplifier depress the power on/off switch again so that it unlatches. The SA150 and SA200 generate very little in the way of undesirable switching surges into the loudspeakers when they are turned on and off but they will faithfully amplify any surges generated by preceding equipment. As the amplifiers are very powerful, these surges may cause damage to certain loudspeakers through no fault of the power amplifier. Note that any A&R equipment likely to be used with the SA150 or SA200 (e.g. C200 control unit or A60AP amplifier) is fully suppressed, so that no switch on surge will occur. However, if your pre-amplifier is in any way suspect it is wise to turn on the power amplifier some moments after switching on the pre-amplifier, in order to allow the pre-amplifier’s circuits to settle down. Similarly, the power amplifier should be turned off well before the preamplifier in order to allow its power supply to discharge fully. LED Overload Indicator On both the SA150 and SA200 the front panel LED to the left of the power on/off switch normally glows green to show that the DC power supplies in the amplifier are operating. It will continue to glow green for a short time after the amplifier is switched off as the DC voltages decay. On the SA200 only the LED also functions as an overload indicator. If either channel of the SA200 clips or distorts significantly then the LED will change colour momentarily from green to red. If the overload is maintained then the LED will glow red continuously and to avoid possible speaker damage the preamplifier volume control should be turned down immediately. Fitting or Changing Side Cheeks If your SA150 or SA200 is not already supplied fitted with Afromosia wood side cheeks it will be fitted with thin metal transit panels. These must be removed and the appropriate wood side cheeks fitted before the amplifier is first used. The wood cheeks are available in two heights—standard (95mm) and tall (145mm). The latter leaves sufficient clearance underneath the SA200 to accept the C200 control unit. To fit the cheeks, proceed as follows (see figures 3 and 4):- 1. Ensure the SA200 is disconnected from the mains supply. 2. Using a № 2 "Posidriv’ screwdriver remove the four bright metal screws from each side of the amplifier. This will free the transit cheeks. Do not attempt to remove the black screws as these hold together parts of the main chassis. 3. Fit the wooden end cheeks using the M4 hex socket cap screws and washers provided. The screws must be tightened firmly with the Allen Key provided. Ensure that the wooden cheeks are fitted the right way round; they are counter-bored where necessary to clear protrusions on the amplifier chassis. Note that the two side cheeks are identical. To exchange side cheeks (e.g. from standard height to tall) simply unscrew the M4 hex socket cap screws holding in each old cheek. The new pair may then be fitted following the procedure of paragraph 3 above. Never operate the amplifier without the proper side cheeks fitted as this could constitute a safety hazard. Figure 3. Transit Side Panel Removal Figure 4. Fitting Wooden Side Cheeks. Technical Details Spares Kit You are provided with a spares and accessory kit containing the following:- SA150 1 IEC line socket with 2m (6.5ft) mains lead. 1 3mm AF Allen key. 2 Spare speaker fuses (2.5 Amp fast blow. 20mm x 5mm). 2 Spare speaker fuses (1.6 Amp fast blow. 20mm x 5mm). SA200 1 IEC line socket with 2m (6.5ft) mains lead. 1 3mm AF Allen key. 2 Spare...
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