PAM1360E PAM960E PAM560E PAM360E SERVICE MANUAL
SERVICE MANUAL PAM1360E/960E/560E/360E INDEX - PAM1360E - BLOCK DIAGRAM - FUNCTIONING DESCRIPTION - SCHEMATICS - COMPONENTS LOCATION SCHEMA - INPUTS AND POWER SUPPLY - POWER AMPLIFIER - TESTING AND QUALITY CONTROL - TECHNICAL CHARACTERISTICS - WIRING DIAGRAM - MECHANICAL DIAGRAM - PACKING DIAGRAM - PAM960E - SCHEMATICS - COMPONENTS LOCATION SCHEMA - POWER AMPLIFIER - PAM560E - SCHEMATICS - COMPONENTS LOCATION SCHEMA - POWER AMPLIFIER - PAM360E - SCHEMATICS - COMPONENTS LOCATION SCHEMA - POWER AMPLIFIER
MODULE CTO 11.0651 OPERATION - DESCRIPTION The control element is the operational NE5534. This is a very low noise operational, especially designed for very high quality applications in professional audio equipment, control equipment and telephony channel amplifiers. The operational is internally compensated for a gain equal to or higher than three.
BIAS CURRENT ADJUST The bias current adjust is performed through the variable resistor connected between the emitters of the current sources R124 (5KΩ). It delivers a supplementary current (it does not go through the operational) which simultaneously increases the voltage which falls in the Rc load resistors. This is the easiest way of acting with just one adjust over both branches at the same time.
SYMMETRY ADJUST The threshold voltage varies much, even between MOSFETs of the same kind. When connecting them in parallel we must be careful that they all have the same conduction current if we want equal currents circulating in all of them. If the conduction voltage of P an N channels MOSFETs is not the same they will conduct different currents, even when we apply identical gate-source voltages.
This resistance performs a negative feedback on the gate, lowering down the Vgs, relating to the drain current; like this: Vgs = Vgg - Id*Rs The higher the Id, the lower the Vgs voltage. The gate is protected by a zener, preventing a possible overload during an unexpected change from overload to real clipping. Given the high input impedance and the broad frequency response of the MOSFETs there is a high risk of self-oscillations if all gates are excited connected to the same node.
The classical protection circuit of this amplifier series has been modified for the PAM1360 E model. The modification consists on exchanging a fixed step by a negative slope in the A zone of the figure, in order to active a better control of the current (Id) for high voltages (Vds). The reasons for this change are: - If the step is low, the MOSFET will operate safely withing the SOA but distortions at low load impedances can arise beacause the protections will activate very fast.
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ZOBEL NETWORK This circuit tries to get a constant load impedance for the power module, in spite of the amplifier's load and frequency, to avoid phase shifting of the feedback signal. The values have been experimentally calculated through a study with square signal by trying to minimize the power amplifier's ringing with very capacitive loads (2,2µF//4Ω). The Zobel Network eliminates possible oscillations of the MOSFETs between 5MHz and 10MHz, too.
DC PROTECTION CIRCUIT 11.0650 OPERATION-DESCRIPTION Fig. 6 corresponds to the DC OUT circuit of channel L. Its mission is protect the loudspeakers when the module fails and there is some continuous voltage appearing at the output. Voltages shown in the figure correspond to rest state and they are given by the dividers made of R146-R147 and R150-R148. If we apply Ohm's Law to these dividers we can obtain these voltages, taking into account that the module's output at rest state (no signal) is 0V.
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CLIP CIRCUIT This circuit is shown in fig. 7. The clip threshold, or point in which we want the LED to light up, is determined by the zener diode D117 or D115. In our case this is between 0,5 and 1dB or, what is the same, when the output signal level over the load reaches a value close to the power supply (+V), exactly Vout = V - 5,6V, moment in which Q104 or Q103 loses the baseemitter voltage, stopping conduction.
TEMPERATURE DETECTOR This circuit (fig. 8) is calculated to operate over the output relay opening it if any of both modules' temperature excedes 90°C, approximately. It is made with a comparator per channel (L-R), resident in the same IC104. Both share a reference voltage provided by IC105 (TL431A), which gives excellent stability at that voltage ±1%. These comparators reveive, the signal from their probes, comparing them with the Vref.
THERMAL PROBE DC AMPLIFIER The cooling fan speed is automatically regulated in relation to the power module’s temperature, which is read by a thermal probe (LM35D), jointly linked to the heat sink. The high sensitivity thermal probe gives variations of de 10mV for every °C. This voltage is picked up and amplified by the IC103 (LM358). Of course, there is a probe for each L and R heat sink.
PARTS LIST: MODEL: PAM1360E/960E 560E/360 DATE: 11.02.98 INPUTS,DC OUT,THERMAL and POWER SUPPLY DRW.Nº 33.
PARTS LIST: MODEL: PAM1360E/960E 560E/360 DATE: 11.02.98 INPUTS,DC OUT,THERMAL and POWER SUPPLY DRW.Nº 33.0268 and 269PL SHEET 2 OF 4 REV: REFERENCE VALUE CODE D113 D114 D115 D116 D117 D118 D119 D120 D121 D122 F101 IC101 IC102 IC103 IC104 IC105 IC106 IC107 IC108 IC109 IC110 J101 J102 J103 J104 J105 J106 J107 J107 J108 J109 J110 J111 J112 J113 K101 Q101 Q102 Q103 Q104 R101 R102 R103 R104 R105 R106 R107 R108 R109 R110 R111 R112 R113 R114 R115 R116 R117 Z8.2 Z8.2 Z5.6 Z8.2 Z5.
PARTS LIST: MODEL: PAM1360E/960E 560E/360 DATE: 11.02.98 INPUTS,DC OUT,THERMAL and POWER SUPPLY DRW.Nº 33.0268 and 269PL SHEET 3 OF 4 REV: REFERENCE VALUE CODE R118 R119 R120 R121 R122 R123 R124 R125 R126 R127 R128 R129 R130 R131 R132 R133 R134 R135 R136 R137 R138 R139 R140 R141 R142 R143 R144 R145 R146 R147 R148 R149 R150 R151 R152 R153 R154 R155 R156 R157 R158 R159 R160 R161 R162 R163 S101 S102 S103 TS101 TS102 PC 11.
PARTS LIST: MODEL: PAM1360E/960E 560E/360 DATE: 11.02.98 INPUTS,DC OUT,THERMAL and POWER SUPPLY DRW.Nº 33.0268 and 269PL SHEET 4 OF 4 REV: REFERENCE VALUE CODE D101 D102 D103 J101 Yellow led 3mm Red led 3mm Red led 3mm B5B-EH-A FCLED300AM FCLED300RO FCLED300VE FCCTM00050 1k5 1k5 1k5 1k5 T 10A FCXR031500 FCXR031500 FCXR031500 FCXR031500 FCFUS60100 560 Ohms 560 Ohms 560 Ohms 560 Ohms T 6.3A FCXR025600 FCXR025600 FCXR025600 FCXR025600 FCFUS60500 0 Ohms 0 Ohms Not assembled Not assembled T 6.
PARTS LIST: MODEL: PAM1360E DATE: 001106 PRINTED CIRCUIT 11.0651 DRW.Nº 33.
PARTS LIST: MODEL: PAM1360E DATE: 001106 PRINTED CIRCUIT 11.0651 DRW.Nº 33.
PARTS LIST: MODEL: PAM1360E DATE: 001106 PRINTED CIRCUIT 11.0651 DRW.Nº 33.
PARTS LIST: MODEL: PAM1360E DATE: 001109 PRINTED CIRCUIT 11.0651 DRW.Nº 33.0266B and 267B PL SHEET 4 OF 4 REV: REPLACES: REPLACED BY: REFERENCE VALUE CODE R182 R183 R184 R185 R186 TP1 TP2 TS101 TS102/103/104/105 10 Ohms / 2W W6.8 Ohms / 5W NF2.
PARTS LIST: MODEL: PAM1360E DATE: 10.02.98 PRINTED CIRCUIT 11.0651 DRW.Nº 33.
PARTS LIST: MODEL: PAM1360E DATE: 10.02.98 PRINTED CIRCUIT 11.0651 DRW.Nº 33.
PARTS LIST: MODEL: PAM1360E DATE: 10.02.98 PRINTED CIRCUIT 11.0651 DRW.Nº 33.
PARTS LIST: MODEL: PAM1360E DATE: 10.02.98 PRINTED CIRCUIT 11.0651 DRW.Nº 33.0266 and 267PL SHEET 4 OF 4 REV: REPLACES: REPLACED BY: REFERENCE VALUE CODE R182 R183 R184 R185 R186 TP1 TP2 TS101 TS102/103/104/105 10 Ohms / 2W W6.8 Ohms / 5W NF2.
PAM 1360/960/560/360E - TESTING RULES PRELIMINARY: Check that there is no shortcircuit between ground and the chassis, wiht the wires of the modules are disconnected from the source of power. Put the power amplifier in stereo mode. We will need, at least, a 1500VA variac for our tests. Connect an ammeter (10A DC scale) in place of one of the fuses of the module in which the tests will be made. Put the oscilloscope probe between TP-GND. SETUP Unplug the fuses of the module that we are NOT setting up.
POWER: Verify the amplifier's power at 8 and 4Ω. Maintain the mains voltage at 230V by means of the variac. Check that the following is true at close-to-clip point: Vin≈1VRMS/ Vo 4Ω ≥ Vin≈1VRMS/ Vo 8Ω ≥ PAM1360E 50.5V RMS 56.8V RMS PAM 960E 42.0V RMS 46.0V RMS PAM 560E 32.0V RMS 37.0V RMS PAM 360E 26.5V RMS 30.5V RMS FREQUENCY RESPONSE: 0.5V input signal. Verify frequency response at 20Hz/2kHz/20kHz. We must get the same signal output for the actual load at any of these frequencies.
PROTECTIONS: Disconnect one of the cables which are usually plugged to the thermals and check that the THERMAL LED is lighting up and the relay opens its contacts. Plug a functions generator connected to the amplifier input,select 1V RMS scale, leave the amplitude control at its minimum and leave at the OFF position. Connect a load of 0,5Ω/200W. Make sure we have a mains voltage of 230V. Connect the oscilloscope in parallel with the load (5V/div. scale).
PAM1360/960/560/360E QUALITY CONTROL We will use a mixer with unbalanced output and a nominal output level of 1V RMS as the signal source for our tests. Connect the mixer outputs to the power amplifier inputs. Plug the power amplifier to mains (check that its specified voltage matches that of mains) and make sure that CLIP/PROTECT and the power switch LEDs all light up when turning on the amplifier and there is a STANDBY time in the relay closing action.
TECHNICAL CHARACTERISTICS Output power (Watt RMS, 1kHz 1% THD) 4 Ohm Stereo* 8 Ohm Stereo* 8 Ohm Mono 16 Ohm Mono PAM 360E PAM 560E PAM 960E PAM 1360E 185W 128W 370W 256W 277W 181W 554W 362W 444W 277W 888W 554W 638W 404W 1275W 808W 150W 107W 300W 215W 228W 154W 456W 307W 408W 250W 816W 498W 588W 383W 1175W 766W 7Hz-50kHz 7Hz-50kHz 7Hz-50kHz 7Hz-50Kz Intermodulation distortion (SMPTE) 50Hz and 7kHz@ 4:1 ratio, nominal power <0,03% <0,03% <0,03% <0,03% TIM 100 <0,05% <0,05% <0,03% <0,
PARTS LIST: MECHANICAL DIAGRAM MODEL:PAM1360/ DRW.Nº 30.0087PL 960/560/360E DATE: 28.05.98 SHEET 1 OF 1 QUANTITY 1 1 1 1 2 1 2 1 1 1 2 4 1 1 1 1 1 1 1 27 4 5 2 1 2 1 REV: REPLACES: REPLACED BY: VALUE CODE FRONT PANEL WD.00.2244 CHASSIS WD.002246 COVER WD.00.2245 REINFORCEMENT CHASSIS WD.00.2255 LATERAL WD.00.2247 FRON PANEL SPACER WD.00.1636 NYLON RIVET 1303 POWER SWITCH BUSHING DM6 MAIN SUPPLY CABLE PRINTED CIRCUIT SPACER ADHESIVE BASE FAN 80x80 GRILLE 80x80 WASHER WD.00.
PARTS LIST: MECHANICAL DIAGRAM MODEL:PAM1360/ DRW.Nº 30.0086 A PL 960/560/360E DATE: 28.05.98 SHEET 1 OF 1 QUANTITY 1 1 2 4 4 4 2 1 1 4 8 REV: REPLACES: REPLACED BY: VALUE CODE HEAT SINK WD.00.2249 HEAT SINK SUPPORT WD.00.2088B CLAMP WD.00.1915 INSULATING TO126 METAL WASHER 3.
PARTS LIST: MECHANICAL DIAGRAM MODEL:PAM1360/ DRW.Nº 30.0086PL 960/560/360E DATE: 28.05.98 SHEET 1 OF 1 QUANTITY 1 1 2 4 4 4 2 1 1 4 8 REV: REPLACES: REPLACED BY: VALUE CODE HEAT SINK WD.00.2249 HEAT SINK SUPPORT WD.00.2088B CLAMP WD.00.1915 INSULATING TO126 METAL WASHER 3.
Nº Qty ECLER Code Description 1 1 FCCAJSTA01 BOX STANDARD 1 2 4 FCCANT1180 INTERIOR REINFORCEMENT 3 1 FCBOLS0200 STANDARD BAG 75x65 4 1 FCBOL00100 BAG 60x80 5 4 FCARN50000 WASHER 5X11,5X0,8M 6 4 FCARAT3000 SCREW INSULATOR 7 2 FCETICAJA0 UNIT INFORMATION LABEL 8 4 FCPIE11255 RUBBER FOOT 9 1 FCFUNMAN00 USER MANUAL BAG 10 1 FCMANPAMKO USER MANUAL PAM/E 11 1 GENERIC (*) FUSE 6X32 10 1 9 1 6 4 8 4 11 1 2 4 5 4 (*) SPECIFIC FUSE TYPES: -PAM360E & PAM560E : FCFUS6
Nº Qty ECLER Code Description 1 1 FCCAJSTA01 BOX STANDARD 1 2 4 FCCANT1010 INTERIOR REINFORCEMENT 3 1 FCBOLS0200 STANDARD BAG 75x65 4 1 FCBOL00100 BAG 60x80 5 4 FCARN50000 WASHER 5X11,5X0,8M 6 4 FCARAT3000 SCREW INSULATOR 7 2 FCETICAJA0 UNIT INFORMATION LABEL 8 4 FCPIE11255 RUBBER FOOT 9 1 FCFUNMAN00 USER MANUAL BAG 10 1 FCMANPAMKO USER MANUAL PAM/E 11 1 GENERIC (*) FUSE 6X32 10 1 9 1 6 4 8 4 11 1 2 4 5 4 (*) SPECIFIC FUSE TYPES: -PAM360E & PAM560E : FCFUS6
PARTS LIST: PACKING DIAGRAM MODEL:PAM1360/ 960/560/360E DRW.Nº 32.0031PL DATE: 28.05.98 SHEET 1 OF 1 QUANTITY 4 4 1 1 1 1 1 4 2 1 1 1 1 1 REV: REPLACES: REPLACED BY: VALUE CODE METAL WASHER 5x11.5x0.8 WASHER AT 5x11.5x3.
PARTS LIST: MODEL: PAM960E DATE: 001106 PRINTED CIRCUIT 11.0651 DRW.Nº 33.
PARTS LIST: MODEL: PAM960E DATE: 001106 PRINTED CIRCUIT 11.0651 DRW.Nº 33.
PARTS LIST: MODEL: PAM960E DATE: 001106 PRINTED CIRCUIT 11.0651 DRW.Nº 33.
PARTS LIST: MODEL: PAM960E DATE: 001106 PRINTED CIRCUIT 11.0651 DRW.Nº 33.0270B and 273B PL SHEET 4 OF 4 REV: REPLACES: REPLACED BY: REFERENCE VALUE CODE R182 R183 R184 R185 R186 TP1 TP2 TS101 TS102/103/104/105 10 Ohms / 2W W6.8 Ohms / 5W NF2.
PARTS LIST: MODEL: PAM960E DATE: 10.02.98 PRINTED CIRCUIT 11.0651 DRW.Nº 33.
PARTS LIST: MODEL: PAM960E DATE: 10.02.98 PRINTED CIRCUIT 11.0651 DRW.Nº 33.
PARTS LIST: MODEL: PAM960E DATE: 10.02.98 PRINTED CIRCUIT 11.0651 DRW.Nº 33.
PARTS LIST: MODEL: PAM960E DATE: 10.02.98 PRINTED CIRCUIT 11.0651 DRW.Nº 33.0270 and 273PL SHEET 4 OF 4 REV: REPLACES: REPLACED BY: REFERENCE VALUE CODE R182 R183 R184 R185 R186 TP1 TP2 TS101 TS102/103/104/105 10 Ohms / 2W W6.8 Ohms / 5W NF2.
PARTS LIST: MODEL: PAM560E DATE: 001106 PRINTED CIRCUIT 11.0651 DRW.Nº 33.
PARTS LIST: MODEL: PAM560E DATE: 001106 PRINTED CIRCUIT 11.0651 DRW.Nº 33.
PARTS LIST: MODEL: PAM560E DATE: 001106 PRINTED CIRCUIT 11.0651 DRW.Nº 33.
PARTS LIST: MODEL: PAM560E DATE: 001106 PRINTED CIRCUIT 11.0651 DRW.Nº 33.0271B and 274B PL SHEET 4 OF 4 REV: REPLACES: REPLACED BY: REFERENCE VALUE CODE R182 R183 R184 R185 R186 TP1 TP2 TS101 TS102/103/104/105 10 Ohms / 2W W6.8 Ohms / 5W NF2.
PARTS LIST: MODEL: PAM560E DATE: 10.02.98 PRINTED CIRCUIT 11.0651 DRW.Nº 33.
PARTS LIST: MODEL: PAM560E DATE: 10.02.98 PRINTED CIRCUIT 11.0651 DRW.Nº 33.
PARTS LIST: MODEL: PAM560E DATE: 10.02.98 PRINTED CIRCUIT 11.0651 DRW.Nº 33.
PARTS LIST: MODEL: PAM560E DATE: 10.02.98 PRINTED CIRCUIT 11.0651 DRW.Nº 33.0271 and 274PL SHEET 4 OF 4 REV: REPLACES: REPLACED BY: REFERENCE VALUE CODE R182 R183 R184 R185 R186 TP1 TP2 TS101 TS102/103/104/105 10 Ohms / 2W W6.8 Ohms / 5W NF2.
PARTS LIST: MODEL: PAM360E DATE: 001106 PRINTED CIRCUIT 11.0651 DRW.Nº 33.
PARTS LIST: MODEL: PAM360E DATE: 001106 PRINTED CIRCUIT 11.0651 DRW.Nº 33.
PARTS LIST: MODEL: PAM360E DATE: 001106 PRINTED CIRCUIT 11.0651 DRW.Nº 33.
PARTS LIST: MODEL: PAM360E DATE: 001106 PRINTED CIRCUIT 11.0651 DRW.Nº 33.0272B and 275B PL SHEET 4 OF 4 REV: REPLACES: REPLACED BY: REFERENCE VALUE CODE R182 R183 R184 R185 R186 TP1 TP2 TS101 TS102/103/104/105 10 Ohms / 2W W6.8 Ohms / 5W NF2.
PARTS LIST: MODEL: PAM360E DATE: 10.02.98 PRINTED CIRCUIT 11.0651 DRW.Nº 33.
PARTS LIST: MODEL: PAM360E DATE: 10.02.98 PRINTED CIRCUIT 11.0651 DRW.Nº 33.
PARTS LIST: MODEL: PAM360E DATE: 10.02.98 PRINTED CIRCUIT 11.0651 DRW.Nº 33.
PARTS LIST: MODEL: PAM360E DATE: 10.02.98 PRINTED CIRCUIT 11.0651 DRW.Nº 33.0272 and 275PL SHEET 4 OF 4 REV: REPLACES: REPLACED BY: REFERENCE VALUE CODE R182 R183 R184 R185 R186 TP1 TP2 TS101 TS102/103/104/105 10 Ohms / 2W W6.8 Ohms / 5W NF2.
