Crown_Power_Base-1,_460CSL_Service_Manual电路图.pdf

Power Base-1 safe with all types of loads, even totally reactive loads. AC Mains: 120VAC at 60 Hz with standard 3 wire grounded 15A connector with single voltage trans- former and fan for North American units; 100VAC, 120VAC, 220VAC, and 240VAC at 50 or 60 Hz when equipped with universal transformer, applicable fan, and other applicable hardware with country specific power cord. Note that at 50 Hz fan speed is reduced. PERFORMANCE Frequency Response: 0.1dB from 20 Hz to 20 kHz at 1 Watt. Phase Response: 10 from 10 Hz to 20 kHz at 1 Watt. Signal to Noise Ratio: Better than 105 dB (A-weighted) below max. average power from 20 Hz to 20 kHz. Total Harmonic Distortion (THD): <0.05% from 20 Hz to 1 kHz, increasing linearly to 0.1% at 20 kHz at 170W. I.M. Distortion: 13V per microsecond. Damping Factor: 1000 from 10 Hz to 400 Hz. DC Offset: <10 millivolts. Input Impedance: Nominally 20K ohms balanced; 10K ohms unbalanced. Output Impedance: <10 milliohms in series with 13V/S. Initial Conditions: Controls per standard. Procedure: Load each channel to 8 ohms. Inject a 10 kHz square wave to obtain 40 volts peak-to-peak at each output. Observe the slope of the square wave. It should typically measure 17 to 25 V/S. Also, the square wave must not include overshoot, ringing, or any type of oscillation. TEST 11: CROSSTALK Spec: <33 mVAC at 20 kHz. Initial Conditions: Controls per standard. Short input of channel not driven. Procedure: 8 ohm load on each channel. Inject a 20 kHz sine wave into the Channel 1 input and increase output level to 37.4 VAC. Measure less than 33 mVAC at the output of Channel 2. Inject a 20 kHz sine wave into the Channel 2 input and increase output level to 37.4 VAC. Measure less than 33 mVAC at the output of Channel 1. TEST 12: OUTPUT POWER Spec at 8 Ohm Stereo: 205W at 0.1% THD. Spec at 4 Ohm Stereo: 230W at 0.1% THD. Initial Conditions: Controls per standard. Procedure: Load each channel to 8 ohms. Inject a 1 kHz sine wave and measure at least 40.5 VAC at the output of each channel. Load each channel to 4 ohms. Inject a 1 kHz sine wave and measure at least 30.3 VAC. All power measurements must be at less than 0.1% THD. TEST 13: REACTIVE LOADS Spec: No oscillations. Safe with all types of loads. Initial Conditions: Controls per standard. Power Base-1 either channel controls limiting in Parallel Mono Mode. Initial Conditions: Controls per standard; rag or other obstruction blocking fan so that it does not turn. Procedure: Load the amplifier to 2 ohms on each channel. Inject a 60 Hz sine wave and adjust for 15 Vrms at the output. After a few minutes observe a wave form similar to Figure 4. Remove the input signal from both channels and allow the amplifier to cool for a few minutes. Switch the amplifier to Parallel Mono and remove the load from Channel 1. Inject the signal into Channel 1 and observe that ODEP limiting occurs at the output of both channels. Remove the load from Channel 2, and install the load on Channel 1. Again, observe that both channels limit. Return all amplifier controls to standard initial conditions. Remove the fan obstruction. TEST 15: LF PROTECTION Spec: Amplifier mutes for low frequency. Initial Conditions: Controls per standard. Procedure: No load. Inject a 0.5 Hz 6 volt peak-to-peak square wave into each channel and verify that each channel cycles into mute. TEST 16: SIGNAL TO NOISE RATIO Spec: 100 dB (105 dB A-weighted) below rated 8 ohm power. Initial Conditions: Controls per standard. Short inputs. Procedure: Load each channel to 8 ohms. Measure less than 400 V at the output of each channel (or 100 dB from reference of +34.25 dBu). TEST 17: TURN ON TRANSIENTS Spec: No dangerous transients. Initial Conditions: Controls per standard. Procedure: From an off condition, turn on the amplifier and monitor the output noise at the time of turn on. Note: Turn on noise may increase significantly if the amplifier is cycled off and on. TEST 18: TURN OFF TRANSIENTS Spec: No dangerous transients. Initial Conditions: Controls per standard. Procedure: From an on condition, turn off the amplifier and monitor the output noise at the time of turn off. Note: Turn off noise may increase significantly if the amplifier is cycled off and on. TEST 19: INTERMODULATION DISTORTION Spec at 0 dB Output: 0.01%. Spec at 35 dB Output: 0.05%. Initial Conditions: Controls per standard. Procedure: Load each channel to 8 ohms. Inject a SMPTE standard IM signal (60 Hz and 7 kHz sine wave mixed at 4:1 ratio) at 200 Watts (32.4 VAC). With an IM analyzer measure less than 0.01% IMD. Repeat test at 35 dB (reference 200 Watts or 32.4 VAC) and mea- sure less than 0.05% IMD. TEST 20: CLIPPING Spec: No protective action during test. Initial Conditions: Controls per standard. Procedure: Load each channel to 8 ohms. Inject a 1 kHz sine wave at each input and drive output 6 dB into clip for 10 seconds. The amplifier should not activate any protective circuits (ODEP, Fault, or LF Protection). POST TESTING After completion of testing, if all tests are satisfactory, the amplifier controls should be returned to the posi- tions required by customer. If conditions are unknown or unspecified, factory settings are as follows: Figure 4. ODEP Limiting Wave Form Power Base-1 if it is marked with a yellow dot then R30 should be a 100 Ohm resistor (A10265-10001). Power Base-1 if it is marked with a yellow dot then R30 should be a 100 Ohm resistor (A10265-10001). Power Base-1 if it is marked with a yellow dot then R30 should be a 100 Ohm resistor (A10265-10001). Q42718-9 Output Module Parts List (P10233-8 Board) Power Base-1 if it is marked with a yellow dot then R30 should be a 100 Ohm resistor (A10265-10001). Power Base-1 if it is marked with a yellow dot then R30 should be a 100 Ohm resistor (A10265-10001). Q42967-2 Output Module Parts List (P10341-9 Board) Power Base-1 if it is marked with a yellow dot then R30 should be a 100 Ohm resistor (A10265-10001). Q43200-7 Output Module Parts List (P10397-1 Board) Power Base-1 full internal fault protection. Balanced phone jack inputs with internal three-position sensitivity switch. Optional XLR or barrier block input connectors are available with the MT-XLR or MT-BB ac- cessories. Ground lift switch is provided to isolate the chassis ground from the phone jack input ground. Efficient heat sinks and self-contained forced air cool- ing system dissipate heat quickly and evenly for extra amplifier protection and greater power output. Three year “No-Fault” full warranty and guaranteed specifications protect your investment. Fig. 1.1 Power Base Front and Back Panels CAUTION: THIS COVER IS NECESSARY FOR EFFICIENT COOLING OF THE AMPLIFIER. REMOVE ONLY TO ACCESS GAIN SWITCH. REG. U.S. PAT. OFF. 4,330,809 4,611,180 CAUTION: TURN OFF AMPLIFIER BEFORE CHANGING THIS SWITCH! STEREO BRIDGE MONO PARALLEL MONO BRIDGE-MONO WIRING TURN AMPLIFIER OFF. SET STEREO/MONO SWITCH TO BRIDGE-MONO. OUTPUT ACROSS RED TERMINALS ONLY. (CH-1 IS POSITIVE.) PARALLEL-MONO WIRING TURN AMPLIFIER OFF. SET STEREO/MONO SWITCH TO PARALLEL-MONO. ADD JUMPER (14 GAGE OR LARGER) ACROSS RED TERMINALS. OUTPUT ACROSS CH-1 TERMINALS ONLY. 1 2 3 4 1 2 3 CH-2CH-1 + + THIS AMPLIFIER IS EQUIPPED WITH SELECTABLE INPUT SENSITIVITY. REMOVE COVER PLATE (ABOVE) TO ACCESS SENSITIVITY SWITCH. CH-2 INPUT GROUND LIFT (AFFECTS PHONE INPUTS ONLY.)(MONO) MODEL: POWER-BASE 3 12.5 AMPS AC VOLTS: 120 60 Hz MAXIMUM OUTPUT: 700 WATTS PER CHANNEL INTO 4 OHMS AT 1 KHz WITH NO MORE THAN 0.1% THD. INPUT GAIN CH-1 INPUT GAIN CLASS 2 OUTPUT WIRING REQUIRED. OUTPUTS CAUTION: TO PREVENT ELECTRIC SHOCK DO NOT REMOVE TOP OR BOTTOM COVERS. NO USER SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED SERVICE PERSONNEL. DISCONNECT POWER CORD BEFORE REMOVING REAR COVER PLATE TO ACCESS SENSITIVITY SWITCH. ATTENTION: DBRANCHER AVANT DOUVRIR. WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE. LIFT PUSH TO RESET BALANCED INPUT WIRING + TIP RING SLEEVEGND UNBALANCED INPUT WIRING +TIP SLEEVEGND 0 1 2 3 4 567 8 9 10 11 120 1 2 3 4 567 8 9 10 11 12 INTERNATIONAL, INC. ELECTRONIC EQUIPMENT ELKHART, IN 46517 MADE IN U.S.A. SERIAL NUMBER 0000 000000 P R E S S R E S E T OFF POWER Removable grille and dust filter Power Indicator Power Switch Stereo/Mono Switch Ch.1 Inch Phone Input Ch.2 Inch Phone Input Ground Lift Switch Ch.1 Level Control Ch.2 Level Control 5-Way Binding Post Output Connectors Access Cover Reset Switch (Power Base3 Only) Power Cord 1.1 Unpacking Please unpack and inspect your new amplifier for any damage that may have occurred during transit. If dam- age is found, notify the transportation company imme- diately. Only you, the consignee, may initiate a claim with the carrier for damage resulting during shipment. Even if the unit arrived in perfect condition, as most do, save all packing materials so you will have them if you ever need to transport the unit. NEVER SHIP THE UNIT WITHOUT THE FACTORY PACK. Power Base Series Power Amplifiers Page 8 MIXER LOUDSPEAKERS + + CHANNEL 1 CHANNEL 2 CHANNEL 1 CHANNEL 2 STEREO MODE BRIDGE-MONO MODE STEREO BRIDGE MONO PARALLEL MONO PARALLEL-MONO MODE MIXER LOUDSPEAKER + ONLY USE THE CHANNEL 1 INPUT ONLY USE THE CHANNEL 1 INPUT STEREO BRIDGE MONO PARALLEL MONO MIXER LOUDSPEAKER + POWER BASE AMPLIFIER POWER BASE AMPLIFIER POWER BASE AMPLIFIER STEREO BRIDGE MONO PARALLEL MONO CAUTION: TURN OFF AMPLIFIER BEFORE CHANGING THIS SWITCH. STEREO BRIDGE MONO PARALLEL MONO CH.2 LEVEL CONTROL GROUND LIFT SWITCH CH.1 LEVEL CONTROL ADD A 14 GAUGE (OR LARGER) JUMPER BETWEEN THE RED CHANNEL 1 AND CHANNEL 2 BINDING POSTS. DO NOT USE BLACK TERMINALS TURN CHANNEL 2 OFF (FULLY CCW) IN THIS MODE. CAUTION: TURN OFF AMPLIFIER BEFORE CHANGING THIS SWITCH. STEREO BRIDGE MONO PARALLEL MONO CHANNEL 2 IS NOT USED IN THIS MODE. CAUTION: TURN OFF AMPLIFIER BEFORE CHANGING THIS SWITCH. STEREO BRIDGE MONO PARALLEL MONO CH-2CH-1 CH-2CH-1 CH-2CH-1 CHANNEL 2 IS NOT USED IN THIS MODE. Fig. 2.1 Three System Connection Methods Power Base Series Power Amplifiers Page 9 2 Installation Always remove power from the unit and turn the level controls off (fully counterclockwise) when making or breaking connections. This reduces the chance of blasts that can cause loudspeaker damage. The guidelines below are provided to help you quickly get your amplifier installed and ready to go. Be sure to follow the instructions in Sections 2.1 and 2.2 for the selected mode of operation. Additional information on input sensitivity, load protection and required AC mains is provided in Sections 2.3, 2.4 and 2.5. 1. Install the amplifier in a standard 19 inch (48.3 cm) rack or place it on a stable surface. The mounting dimensions are 19 inches (48.3 cm) wide, 3.5 inches (8.9 cm) tall and 16 inches (40.6 cm) deep behind the mounting sur- face. IMPORTANT! Allow for adequate ventilation. 2.1 Stereo 1. Turn down the level controls (fully counterclockwise) and turn off the amplifier. 2. Set the back panel stereo/mono switch to Stereo. 3. If present, remove the Parallel-Mono jumper. 4. Connect the input and output cables as shown in the first example in Figure 2.1. 5. Turn on the amplifier and adjust the level for each chan- nel using the back panel level controls. CAUTION: Never parallel the two outputs by di- rectly tying them together, and never parallel them with the output of another amplifier. 2.2 Mono Your amplifiers mono modes provide double the power of Stereo mode in a single channel. In Bridge- Mono mode, the outputs are wired in series for twice the output voltage. In Parallel-Mono mode, the outputs are paralleled for twice the current capacity. Bridge-Mono mode is provided for loads with an im- pedance greater than 4 ohms. Parallel-Mono mode should be used with loads of 4 ohms or less. B R I D G E - M O N O 1. Turn down the level controls (fully counterclockwise) and turn off the amplifier. 2. Set the back panel stereo/mono switch to Bridge-Mono. 3. If present, remove the Parallel-Mono jumper. 4. Connect the input and output cables as shown in the sec- ond example in Figure 2.1. Only use the channel 1 input. 5. Make sure the load is balanced (neither side shorted to ground) and do not use the black () binding posts. 6. Turn on the amplifier and adjust the level. Only use the channel 1 level control. P A R A L L E L - M O N O 1. Turn down the level controls (fully counterclockwise) and turn off the amplifier. 2. Set the back panel stereo/mono switch to Parallel-Mono. 3. Install a solid, 14-gauge (2 mm2) or heavier jumper wire across the two red (+) binding post outputs. 4. Connect the input and output cables as shown in the third example in Figure 2.1. Only use the channel 1 input. 5. Turn on the amplifier and adjust the level. Only use the channel 1 level control. CAUTION: With Parallel-Mono wiring, do not switch to Stereo or Bridge-Mono mode until the output jumper wire is removed. AIR FLOW AIR FLOW AMPLIFIER (TOP VIEW) RACK CABINET 16 in 40.6 cm 2 in MIN. 17 in 43.2 cm AIR FLOW IMPORTANT: Be sure the back of the amplifier is supported. + 3 1 2 GND FROM PREAMPLIFIERINPUT BALANCED + SHIELD FROM PREAMPLIFIER INPUT UNBALANCED + SHIELD + 3 1 2 SHIELD Fig. 2.3 Power Base Input Wiring 2. Use high-quality loudspeaker cables to connect the load to the amplifiers outputs. Do not use shielded cable. 3. Use shielded cables to connect audio sources to the amplifier inputs. Either balanced or unbalanced wiring can be used as shown below. (XLR connectors are avail- able with the MT-XLR accessory. See Section 5.) Fig. 2.2 Do NOT Block Air Flow Power Base Series Power Amplifiers Page 10 2.3 Input Sensitivity Adjustment The input sensitivity switch inside the amplifier is set to 0.775 volts at the factory. It can be changed to 1.4 volts or a voltage gain of 26 dB as follows: 1. Turn off and unplug the amplifier from the AC source. 2. Remove the access cover on the back panel. 3. Locate the labeled access hole for the sensitivity switch. 4. Set the switch to the desired position. 5. Replace the access cover plate. When set to 26 dB gain, the Power Base-1 requires a 2.0 volt input, the Power Base-2 requires a 2.5 volt in- put and the Power Base-3 requires a 3.2 volt input to deliver full output into an 8 ohm load. 0.77 V 26 dB SENSITIVITY SWITCH INSIDE ACCESS HOLE 1.4 V THIS AMPLIFIER IS EQUIPPED WITH SELECTABLE INPUT SENSITIVITY. REMOVE COVER PLATE (ABOVE) TO ACCESS SENSITIVITY SWITCH. CH-2 INPUT GROUND LIFT (AFFECTS PHONE INPUTS ONLY.)(MONO) INPUT GAIN CH-1 INPUT GAIN LIFT BALANCED INPUT WIRING + TIP RING SLEEVEGND UNBALANCED INPUT WIRING +TIP SLEEVEGND 0 1 2 3 4 5 6 7 8 9 10 11 120 1 2 3 4 5 6 7 8 9 10 11 12 Fig. 2.4 Input Sensitivity Switch 2.4 Additional Load Protection To protect against excessive power, a fuse can be added in series with each loudspeaker cable. A single fuse can protect the entire system, or one can be used for each driver. High-frequency drivers (tweeters) are usually more sensitive to