Ecler PAM1000 Service manual
Contents
1. 15 BINARY COUNTER HEF4520 This is a 4 bit double binary counter Configured in a way in which when there is the binary code equivalent to decimal number 5 at its output so this is 1 0 0 it is blocked in this position until it receives a new MR reset pulse The blocking action is performed by the NAND gate between legs Q2 and CP1 At this state Q2 becomes H one logical the NAND changes its state putting the leg CP1 to L zero logical and as you can see in the table of functions the mode can not change in this conditions CPO CP1 MR MODE 8 H L counter advance L 9 L counter advance 9 X L no change X 8 L no change 8 L L no change H 9 L no change X X H Q0 to Q3 low The general turn on reset initializes the counter Every time it receives a pulse from the module opto couplers because of a protections shot it is counted If during an interval of approximately 5 minutes it does not receive any other pulse the counter will go back to the original zero state because it receives a new MR reset pulse from the monostable IC311 whose time constant is approximately 5 minutes R342 C319 This monostable begins counting from the very first pulse received by the counter because both are linked to the PROTECT SIGNAL from the module and consequently activated at the same time If during this time interval about 5 minutes a minimum of 5 successive pulses are received these will make the counter block at that po2. 5k6 5 R177 MF487 R178 MF1k00 R179 22k R180 1k8 R181 1k8 R182 MF3k65 PARTS LIST INPUT CIRCUIT MODEL PAM600 DRW No 33 0010PL REV DATE 081193 SHEET 1 OF 2 REPLACED BY REFERENCE VALUE C201 220p C202 220p C203 47 25 C204 C100n C205 47 25 C206 C100n C207 220p C208 220p C209 C15p C210 C8p2 C211 10 35 C212 C15p C213 C8p2 C214 10 35 C215 C100n C216 C100n CABLE27 CABLE27 CABLE27 CABLE27 CTO 11 0497 8 CTO FRA CU D201 1N4148 D202 1N4148 D203 1N4148 D204 1N4148 D205 1N4148 D206 1N4148 D207 1N4148 D208 1N4148 D209 1N4148 D210 1N4148 D211 Z18 1 D212 Z18 1 IC201 NE5532A IC202 TL072 J201 YKF52 5003 J202 YKF52 5005 J203 B3P VH J204 YKF52 5003 J205 YKF52 5005 J206 2600 6TS J207 2600 6TS J208 B3P VH J209 2600 7TS J210 B5P VH J211 B5P VH L201 68 H L202 68 H L203 68 H L204 68 H R201 MF1k00 R202 MF1k00 R203 W1k5 4 R204 W1k5 4 R205 MF1k00 R206 MF1k00 R207 MF23k7 R208 MF47k5 PARTS LIST INPUT CIRCUIT MODEL PAM600 DRW No 33 0010PL REV DATE 081193 SHEET 1 OF 2 REPLACED BY REFERENCE VALUE R209 MF23k7 R210 MF47k5 R211 MF23k7 R212 MF47k5 R213 MF23k7 R214 MF47k5 R215 MF1k00 R216 MF1k00 R217 MF340k R218 56 R219 MF1k00 R220 MF340k R221 MF1k00 R222 56 R223 1k5 R224 1k5 R225 1k5 S601 17 155 PARTS LIST POWER CIRCUIT MODEL PAM600 300 DRW No 33 0011PL REV DATE 081193 SHEET 1 OF 1 R
3. Temperature affects MOSFETs conduction in two different ways first the conduction threshold voltage has a negative temperature coefficient second the drain source conduction resistance increases with temperature Depending on which of the two things is predominating the temperature coefficient of the drain can be positive or negative In our case in which the gate source voltage in the MOSFETs is very low when they conduct the temperature coefficient of drain current which is positive is predominating To avoid thermal runaway in the polarizing current we must decrease the gate source voltage as the MOSFETs get hot Temperature stabilization is performed by modifying the reference voltage of both sources If the temperature increases the Vref must decrease so that Ic and VRc decrease and as a consequence the gate source voltage also decreases The circuit used is shown in figure 3 The base emitter Vbe temperature voltage feature is used to obtain the final result we need The main idea is adequately choosing R1 and R2 to obtain the right temperature coefficient 3 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 identic
4. YELLOW D702 RED D703 RED D704 YELLOW D705 RED D706 RED D707 RED D708 GREEN D709 GREEN J701 B6P VH J702 B3P VH R701 2k2 R702 2k2 CTO 11 0501 CTO FRA CU PARTS LIST SOFT START AND POWER CIRCUIT MODEL PAM1400 1000 DRW No 33 0006PL REV DATE 081193 SHEET 1 OF 1 REPLACES REPLACED BY REFERENCE VALUE C801 2 2 63 C802 2 2 63 C803 47 100 C804 47 100 C805 10n 400 D801 1N4007 D802 1N4007 D803 1N4007 D804 1N4007 F801 TF117 C J801 FASTON 6 3 J802 FASTON 6 3 J803 TP MJ J804 FASTON 6 3 J805 FASTON 6 3 J806 FASTON 6 3 J807 FASTON 6 3 J808 FASTON 6 3 J809 FASTON 6 3 J810 FASTON 6 3 J811 FASTON 6 3 K801 E3209 6000 K802 E3209 6000 R801 W4k7 5 R802 6k8 2 R803 6k8 2 R804 2 2 1 R805 W39 8 R806 W39 8 R807 W39 8 WIRE 26 WIRE 26 WIRE 5 WIRE 5 WIRE 6 WIRE 6 WIRE 7 WIRE 7 CTO 11 0499 CTO FRA CU PARTS LIST POWER CIRCUIT AND AND SHORT CIRCUIT PROTECTION MODEL PAM1400 DRW N 33 0001PL REV A DATE 000621 SHEET 1 OF 4 REPLACED BY REFERENCE VALUE C101 47 100 C102 C100n C103 10 50 C104 10 50 C105 C15p C106 C100n C107 C100n C108 C100n C109 C39p C110 C39p C111 47 100 C112 47 100 C113 100n 400 C114 47n 400 C115 47 50 C116 47 50 C117 680n C118 680n C119 220n 100 C120 220n 100 C121 220n 100 C122 220n 100 C123 220n 100 C124 220n 100 C125 680n C126 680n C127 1 63 C128 100 25 D101 Z3 6 1 D10
5. 47K R348 100k R349 100k R350 10K R351 5K6 R352 0 R353 590K R354 332K R355 332K R356 226K R357 5K6 R358 100k R359 6K8 R360 6K8 R361 560 PARTS LIST PROTECTIONS CIRCUIT MODEL PAM1000 DRW No 33 0014PL REV DATE 241293 SHEET 4 OF 4 REPLACES REPLACED BY REFERENCE VALUE R362 100k R363 100k R364 100k R365 39K R366 39K R4 6K8 R5 6K8 R6 0 R7 0 R8 6K8 R9 6K8 SCREW M3X8 DIN7985 NINE SCREW M3X8 DIN7985 NINE WASHER ADE M3 WASHER ADE M3 PC 11 0411 PRINTED CIRCUIT PARTS LIST POWER CIRCUIT AND SHORT CIRCUIT PROTECTION MODEL PAM600 DRW N 33 0009PL REV A DATE 000621 SHEET 1 OF 3 REPLACED BY REFERENCE VALUE C101 47 100 C102 C100n C103 10 50 C104 10 50 C105 C15p C106 C100n C107 C100n C108 C100n C109 C68p C110 C68p C111 47 100 C112 47 100 C113 100n 400 C114 47n 400 C115 47 50 C116 47 50 C117 680n C118 680n C119 220n 100 C120 220n 100 C121 220n 100 C122 220n 100 C123 220n 100 C124 220n 100 C125 680n C126 680n C127 1 63 C128 100 25 CTO 11 0504 CTO FRA CU D101 Z3 6 1 D102 Z3 6 1 D103 Z11 1 D104 Z11 1 D105 Z12 D107 Z12 D108 Z12 D110 Z12 D111 Z12 D113 Z12 D114 Z12 D116 Z12 D117 Z18 1 D118 Z18 1 D119 Z18 1 D120 Z18 1 D121 Z18 1 D122 1N4148 D123 1N4148 D124 Z18 1 D125 Z15 D126 TL431 F101 TI 12 5 F102 TI 12 5 IC101 5534N IC102 4N35 IC103 4N35 IC104 4N32 IC105 LM35D
6. 6 3mm PARTS LIST POWER CIRCUIT AND SHORT CIRCUIT PROTECTION MODEL PAM300 DRW N 33 0012PL REV A DATE 000621 SHEET 2 OF 3 REPLACED BY REFERENCE VALUE J103 FASTON 6 3mm J104 B3P VH J105 B3P VH J107 B5B XH J108 B5B XH J109 2600 3TS Q101 BF871 Q102 BF872 Q103 MJE15031 Q104 MJE15030 Q106 IRFP240 Q108 IRFP240 Q110 IRFP240 Q112 IRFP9240 Q114 IRFP9240 Q116 IRFP9240 Q117 2N5401 Q118 2N5401 Q119 BC337 Q120 BC337 Q121 2N5551 Q122 2N5551 Q123 2N5551 Q124 BC547B Q125 BC547B Q126 BD437 Q127 BD437 R101 MF1k00 R102 MF47k5 R103 MF1k00 R104 680k R105 680k R106 MF24k3 R107 1k5 R108 1k5 R109 1k 5 R110 5k R111 500O R112 NF 390O 5 R113 NF 680O 5 R114 MF787O R115 MF191O R116 MF191O R117 MF787O R118 NF68O 1 R119 10O 5 R120 NF68O 1 R121 10O 5 R122 1O 5 R123 1O 5 R125 W 22O 5 R127 W 22O 5 R129 W 22O 5 R131 NF220 5 R133 NF220 5 R135 NF220 5 R137 NF220 5 R139 NF220 5 PARTS LIST POWER CIRCUIT AND SHORT CIRCUIT PROTECTION MODEL PAM300 DRW N 33 0012PL REV A DATE 000621 SHEET 3 OF 3 REPLACED BY REFERENCE VALUE R141 NF220 5 R143 W 22O 5 R145 W 22O 5 R147 W 22O 5 R148 NF2 2O 2 R149 6 8O R150 6 8O R151 10O 2 R152 W1k2 2 R153 W6 8O 5 R154 W1k2 2 R155 MF1k00 R156 MF487O R157 5k6 5 R158 8k2 5 R159 1k2 R160 22k R161 330k R162 10k R163 100O R164 3k3 R165 820O R166 330k R167 5k6 R168 5k6 5 R
7. 680n C119 220n 100 C120 220n 100 C121 220n 100 C122 220n 100 C123 220n 100 C124 220n 100 C125 680n C126 680n C127 1 63 C128 100 25 D101 Z3 6 1 D102 Z3 6 1 D103 Z11 1 D104 Z11 1 D105 Z12 D106 Z12 D107 Z12 D108 Z12 D109 Z12 D110 Z12 D111 Z12 D112 Z12 D113 Z12 D114 Z12 D115 Z12 D116 Z12 D117 Z30 1 D118 Z30 1 D119 Z30 1 D120 Z30 1 D121 Z30 1 D122 1N4148 D123 1N4148 D124 Z27 1 D125 Z10 D126 TL431 F101 TI 16A F102 TI 16A IC101 5534N IC102 TIL112 PARTS LIST POWER CIRCUIT AND AND SHORT CIRCUIT PROTECTION MODEL PAM1400 DRW N 33 0001PL REV DATE 081193 SHEET 2 OF 4 REPLACED BY REFERENCE VALUE IC103 TIL112 IC104 4N32 IC105 LM35D J101 FASTON 6 3mm J102 FASTON 6 3mm J103 FASTON 6 3mm J104 INPUT J105 PROTEC J107 B5B XH J108 B5B XH J109 2600 3TS Q101 BF871 Q102 BF872 Q103 MJE15031 Q104 MJE15030 Q105 IRFP240 Q106 IRFP240 Q107 IRFP240 Q108 IRFP240 Q109 IRFP240 Q110 IRFP240 Q111 IRFP9240 Q112 IRFP9240 Q113 IRFP9240 Q114 IRFP9240 Q115 IRFP9240 Q116 IRFP9240 Q117 2N5401 Q118 2N5401 Q119 BC337 Q120 BC337 Q121 2N5551 Q122 2N5551 Q123 2N5551 Q124 BC547B Q125 BC547B Q126 BD437 Q127 BD437 R101 MF1k00 R102 MF47k5 R103 MF1k00 R104 680k R105 680k R106 MF51k1 R107 1k5 R108 1k5 R109 1k5 5 R110 5k R111 500O R112 NF 390O 5 R113 NF 680O 5 R114 MF787O R115 MF191O R116 MF191O R117 MF787O R118
8. Circuit operation The AC signal present at the anode D321 is rectified by this attenuated and filtered by R13 R348 R347 and C322 apllying it to the base of Q306 which is conducting into saturation and as a consequence Q305 is cut When this signal disappears Q306 is cut and then Q305 has its base feeded through R345 R346 and R14 from the V power supply which has begun to lose voltage because we have just cut the mains but because of the high capacity value of the filter condensers there is enough time to saturate Q305 which puts the resistances R15 and R344 50 in parallel with the power supply 10V of the logic circuitry completely discharging the capacities of the circuit leaving it ready for a new reset pulse the connection one what warranties the new turn on even with very short time intervals 1s between turn off and connection pulses CONNECTION RESET This is made of C315 R336 and D314 It is the classical reset circuit used in lots of applications In the exact connection moment the condenser C315 is not charged with a high amount of current circulating through it or a high voltage in R336 This current decreases as the condenser is charging until it disappears At the same time the voltage in the extremes of the resistance goes from maximal in the beginning to 0V This way we get a pulse whose duration depends on the time constant RC The aim of the diode D314 is a fast discharging of C315 during disconnection
9. PARTS LIST POWER CIRCUIT AND SHORT CIRCUIT PROTECTION MODEL PAM600 DRW N 33 0009PL REV A DATE 000621 SHEET 2 OF 3 REPLACED BY REFERENCE VALUE J101 FASTON 6 3mm J102 FASTON 6 3mm J103 FASTON 6 3mm J104 B3P VH J105 PROTEC J107 B5B XH J108 B5B XH J109 2600 3TS Q101 BF871 Q102 BF872 Q103 MJE15031 Q104 MJE15030 Q105 IRFP240 Q107 IRFP240 Q108 IRFP240 Q110 IRFP240 Q111 IRFP9240 Q113 IRFP9240 Q114 IRFP9240 Q116 IRFP9240 Q117 2N5401 Q118 2N5401 Q119 BC337 Q120 BC337 Q121 2N5551 Q122 2N5551 Q123 2N5551 Q124 BC547B Q125 BC547B Q126 BD437 Q127 BD437 R101 MF1k00 R102 MF47k5 R103 MF1k00 R104 680k R105 680k R106 MF33k2 R107 1k5 R108 1k5 R109 1k 5 R110 5k R111 500O R112 NF390O 5 R113 NF680O 5 R114 MF787O R115 MF191O R116 MF191O R117 MF787O R118 NF68O 1 R119 10O 5 R120 NF68O 1 R121 10O 5 R122 1O 5 R123 1O 5 R124 W 22O 5 R126 W 22O 5 R127 W 22O 5 R129 W 22O 5 PARTS LIST POWER CIRCUIT AND SHORT CIRCUIT PROTECTION MODEL PAM600 DRW N 33 0009PL REV A DATE 000621 SHEET 3 OF 3 REPLACED BY REFERENCE VALUE R130 NF330O 5 R132 NF330O 5 R133 NF330O 5 R135 NF330O 5 R136 NF330O 5 R138 NF330O 5 R139 NF330O 5 R141 NF330O 5 R142 W 22O 5 R144 W 22O 5 R145 W 22O 5 R147 W 22O 5 R148 NF2 2O 2 R149 6 8O R150 6 8O R151 10O 2 R152 W1k5 4 R153 W6 8O 5 R154 W1k5 4 R155 MF1k00 R156 MF487O R157 5k6 5 R1
10. R161 330k R162 10k R163 100O R164 3k3 R165 820 R166 330k R167 10k R168 10k 5 R169 3k3 5 R170 MF5k62 R171 27k 5 R172 MF464 R173 MF1k00 R174 2k2 R175 8k2 5 R176 5k6 5 R177 MF487 R178 MF1k00 R179 22k PARTS LIST POWER CIRCUIT AND SHORT CIRCUIT PROTECTION MODEL PAM1000 DRW No 33 0008PL REV A DATE 000621 SHEET 4 OF 4 REPLACES REPLACED BY REFERENCE VALUE R180 1k R181 2k2 PARTS LIST POWER CIRCUIT AND SHORT CIRCUIT PROTECTION MODEL PAM1000 DRW No 33 0008PL REV DATE 081193 SHEET 1 OF 4 REPLACES REPLACED BY REFERENCE VALUE C101 47 100 C102 C100n C103 10 50 C104 10 50 C105 C15p C106 C100n C107 C100n C108 C100n C109 C47p C110 C47p C111 47 100 C112 47 100 C113 100n 400 C114 47n 400 C115 47 50 C116 47 50 C117 680n C118 680n C119 220n 100 C120 220n 100 C121 220n 100 C122 220n 100 C123 220n 100 C124 220n 100 C125 680n C126 680n C127 1 63 C128 100 25 CTO 11 0504 CTO FRA CU D101 Z3 6 1 D102 Z3 6 1 D103 Z11 1 D104 Z11 1 D106 Z12 D107 Z12 D108 Z12 D109 Z12 D110 Z12 D112 Z12 D113 Z12 D114 Z12 D115 Z12 D116 Z12 D117 Z24 1 D118 Z24 1 D119 Z24 1 D120 Z24 1 D121 Z24 1 D122 1N4148 D123 1N4148 D124 Z24 1 D125 Z15 1 D126 TL431 F101 TI 16A F102 TI 16A IC101 5534N PARTS LIST POWER CIRCUIT AND SHORT CIRCUIT PROTECTION MODEL PAM1000 DRW No 33 0008PL REV DATE 081193 SHEET
11. REPLACED BY QUANTITY DESCRIPT 10 SCREW 2 9x6 5 DIN7981 2 SCREW 3 5x6 5 DIN 7981 34 SCREW M4x6 SPANLO DIN7985 5 SCREW M4x12 DIN7985 1 SCREW M4x20 DIN7985 4 SCREW M4x10 SPANLO DIN966 4 SCREW M4x8 TX SPIRALFORM 4 SCREW M4x6 DIN7985 10 METAL WASHER ADE M4 1 METAL WASHER 4 2x9x0 5 4 METAL WASHER 4x7x0 5 2 METAL WASHER 4 2x9x1 5 9 NUT M4 DIN934 8 NUT M5 DIN934 4 METAL WASHER 5 2x10x1 2 METAL WASHER AND NUT POTENTIOMETER 1 RIVET NUT M4 PSM 1 GROUND TERMINAL N 00 1761 1 SECURITY WASHER M4 3 NYLON RIVET 1303 4 MINIATURE SUPPORT MSP 6N 4 SEPARATOR N 00 1636 4 BASE 11x25 1 FUSE HOLDER 6x32 1 COMMUTATOR N 17 120 4 SUPPORT LKC 4 FLANGE T 50L 1 TRANSFORMER REF 18Z160 19Z130 WIT ASSEMBLY KIT 1 FAN REF NMB3110NL 04W B50 1 CHASSIS N 00 1960 1 CHASSIS N 00 1959 1 HANDLE ASSEMBLY N 00 1967 1 COVER N 00 1963 1 UPPER FRONT PANEL N 00 1956 1 LOWER FRONT PANEL N 00 1957 2 JOINED CONNECTOR LOUDSPEAKER 1 PROTECTOR FAN 80x80mm 1 HANDLE ASSEMBLY N 00 1962 PARTS LIST ASSEMBLY MODULE MODEL PAM600 DRW No 30 0005PL REV DATE 101293 SHEET 1 OF 1 REPLACES REPLACED BY QUANTITY VALUE 3 METAL WASHER 3 2X6X0 5 2 INSULANT WASHER R19 2 MICA TO 220 2 MICA TO 126 1 WIRE N 9 4 SCREW M3X8 SPIRALFORM DIN7985 4 SCREW M3X15 SPIRALFORM DIN 7985 4 NYLON SEPARATOR 3 6X6 4 4 SCREW M4X6 SPANLO DIN7985 2 RIVET NUT M3X3 2 ACCESSORY PL N 1775 2 SCREW M3X8 DIN7985 2 WASHER ADE M3 2 ACCESSORY PL N 1915 4 CARTON WASHER 3 2X6X1 1 INSU
12. REV DATE 241293 SHEET 2 OF 4 REPLACES REPLACED BY REFERENCE VALUE FAN FAST 2 8 GND FAST 2 8 IC301 7805 IC302 7805 IC305 LM358D IC306 LM358D IC307 HEF4001B IC308 HEF4011B IC309 HEF4520B IC310 HEF4538B IC311 HEF4538B IC312 HEF4001B INSULANT WASHER R19 INSULANT WASHER R19 J302 FAST 6 3 J303 FAST 6 3 J304 B6P VH J305 B6P VH J306 FAST 6 3 J307 FAST 6 3 J309 B3P VH J310 B3P VH J311 B3P VH K301 E 3209 6000 K302 E 3209 6000 MA301 MAGNET MA302 MAGNET MA303 MAGNET MA304 MAGNET NUT M3 NUT M3 PL N 1777 RADIATOR Q301 BC847B Q302 2N5551 Q303 2N5551 Q304 2N5401 Q305 BC817 Q307 BC847B Q308 2N5551 Q308 2N5551 Q309 2N5551 Q310 2N5401 R1 680 R10 100k R11 39K R12 100k R13 100k R14 68K R15 100 R2 100k R3 39K R301 2K2 R302 680 R303 7K50 R304 90K9 R305 15K PARTS LIST PROTECTIONS CIRCUIT MODEL PAM1000 DRW No 33 0014PL REV DATE 241293 SHEET 3 OF 4 REPLACES REPLACED BY REFERENCE VALUE R306 7K50 R307 90K9 R308 15K R309 10K R310 1K R311 2K7 R312 1K43 R313 604 R314 10K R315 1K R316 2M2 R317 2M2 R318 5K6 R319 5K6 R320 332K R321 332K R322 590K R323 226K R324 5K6 R325 5K6 R326 0 R327 100k R328 6K8 R329 6K8 R330 560 R331 100K R332 100k R333 100k R334 10K R335 100k R336 5K6 R337 10K R338 100k R339 10K R340 680K R341 680K R342 1M2 R343 1M2 R344 100 R345 100 R346 68K R347
13. and load the amplifier with 4 Check that all MOSFETs are conducting approximately the same current level measure this current with the oscilloscope probe by palcing it on the 0 22 source resistances The maximum conduction difference between MOSFETs should be 100mV When making this test be sure the oscilloscope ground is not connected to any other place of the circuit when making the reading just to the 0 22 resistance If you do not follow this rule you could produce a shortcircuit between two points of the circuit and therefore a very important damage POWER Verify the amplifier s power at 8 and 4 Maintain the mains voltage at 220V by means of the variac Check that your own figures match the following at close to clip point PAM1400 PAM1000 PAM600 PAM300 Vin 1VRMS Vo 4 49 0Vrms 45 1Vrms 34 5Vrms 26Vrms Vin 1VRMS Vo 8 56 0Vrms 49 7Vrms 39 7Vrms 30Vrms 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 the frequencies Set the frequency at 50kHz the output level should not decrease more than 1 or 2 dB and there should not be any noticeable distortion CLIPPING AT 1kHz Introduce such a signal that the amplifier is just about to clip Measure the voltage up at the output with the actual load and check that when the voltage decreases between 0 5 and 1 dB the clipping LEDs light down Check each LED corresp
14. any malfunction This makes the voltage dividers lose balance no matter if the above mentioned voltage is positive or negative the gate goes to 0V the base Q302 loses the current stream and as a consequence the relay K301 opens The aim of the zeners D309 and D310 is protecting the gates avoiding the voltage in them to be higher than 8 2V when the voltage is positive and lower than 0 6V when it is negative as you can see the zener plays the role of a diode 13 CLIP CIRCUIT The other half of IC307 4001 is used in the clip circuit Given that we have two gates more and we just need one for our purposes we will connect them in parallel for a higher output current and a more effective LED lighting up The clip threshold or point where we want the LED to light up is determined by the zener D313 In our case it is between 0 5 and 1dB or what is the same when the output signal level over the load reaches a value close to that of the power supply V exactly Vout V 5 6 moment in which Q304 loses the base emitter voltage stopping conduction this makes the zener D312 voltage disappear 0V and the output from IC307 go to 1 logic 10V making the LED light up 14 GENERAL RESET CIRCUIT TURN OFF TURN ON TURN OFF RESET This circuit starts working when the AC current from the transformer secondary disappears or what is the same when we turn the power amplifier off by pushing the power off switch actually disconnecting it from mains
15. diodes D304 and D305 making an O gate whose cathodes go to the regulator applying the DC of any of them to the regulator This provides a variable voltage at its output which oscillates from a minimum of approximately 7V for a temperature of 20EC cold heatsink to a maximum of 14V for temperatures of 76EC or higher The gain of the amplifiers has been calculated for this temperatures window The maximum voltage allowed by the heatsink in order to work properly is 14V This maximum is given by the zener D305 Z9 1 1 as the regulator is a 7805 the voltage will be as maximum 9 1 5 14 1V When the zener is not working not enough voltage the voltage on the fan will be the output amplifiers less 0 6V diodes fall plus the 5V of the IC302 10 11 TEMPERATURE DETECTOR This circuit is calculated to operate over the output relay opening it if any of both modules temperature excedes 90EC approximately It is made with a comparator per channel L R resident in the same IC306 Both share a reference voltage provided by D306 TL431A which gives excellent stability at that voltage 1 These comparators reveive like the DC amplifiers the signal from their probes comparing them with the Vref Once this voltage is surpassed by any of both probes the output of the corresponding comparator is balanced to the power supply 10V acting through D307 R318 D308 and R319 over the respective bases of transistors Q301 y Q307 which makes the corresp
16. power 0 03 0 03 0 03 0 03 TIM 100 0 05 0 05 0 05 0 03 Signal noise ratio from 20Hz to 20kHz Ref 1W 4 85dB 80dB 80dB 85dB To 4 nominal power 107dB 105dB 106dB 110dB Damping factor at 1kHz 8 350 310 400 420 Slewrate 32V s 75V s 80V s 85V s Channel crosstalk at 1kHz 80dB 80dB 80dB 80dB at 20kHz 60dB 60dB 55dB 55dB Inputs balanced and provided with XLR3 Sensitivity load 0dBV 1V 47k CLIP indicators at 0 3dB Outputs These are provided with 2 pairs of 4mm banana Protections Delayed turn on heavy duty relay with PROTECT indicator ON during standby DC 4Hz or DC at 2V PROTECT INDICATOR Thermal A sensor activates a high temperature detection circuit channel shut down at 90 THERMAL indicator Overload Protection against output short circuit PROTECT indicator Autoreset Four automatic reset during five minutes in case of short circuit After this period reset mustbe done manually Soft start system PAM 1000 1400 Varispeed Fan controled according to internal temperature Power requirements 110V 120V 220V 230V 240V AC 50 60Hz 530VA 965VA 1443VA 1800VA Dimensions Front pannel 482 6x88x5mm 482 6x132 5x5mm Chassis 440x88x420mm 440x132 5x420mm Weight 14 35kg 15 90kg 21 85kg 24 35kg PARTS LIST MECHANICAL DIAGRAM REV C MODEL PAM1400 1000 DRW N 300001PL REPLACES DATE 180297 SHEET 1 OF 1 REPLACED BY QUANTITY DESCRIPT 10 SC
17. whole amplifier is compensated with just one capacity which places the amplifier s general pole at 1 Fp 140KHz 2 Rf Cf Rf R106 Cf C109 C110 9 PROTECTION CIRCUIT 11 0411 OPERATION DESCRIPTION The circuit is configured by A POWER SUPPLY A THERMAL PROBE DC AMPLIFIER A TEMPERATURE DETECTOR A DC OUT DETECTOR PER CHANNEL A CLIP CIRCUIT PER CHANNEL A RESET TURN OFF TURN ON CIRCUIT A BINARY COUNTER PER CHANNEL TWO MONOSTABLE CIRCUITS PER CHANNEL The circuit power supply is performed through various sources V module s power supply This voltage feeds the relays circuit manual reset circuit and part of the clip circuit Alternate voltage from a transformer s secondary manual reset circuit There is also a stabilized 10V power supply which feeds the card s circuitry made of IC301 7805 plus the zener D302 Z4 7 4 7 5 10V We will also need a regulated power supply to get 14Vmax at 0 7A which can be obtained with IC302 7805 plus an auxiliary circuitry that will be analysed below 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 This high sensitivity thermal probe gives variations of 10mV for every EC This voltage is picked up and amplified by the IC305 LM358 Of course there is a probe for each L and R heatsink The output of both amplifiers is linked through two
18. 0 Q110 IRFP240 Q112 IRFP9240 Q114 IRFP9240 Q116 IRFP9240 Q117 2N5401 Q118 2N5401 Q119 BC337 Q120 BC337 Q121 2N5551 Q122 2N5551 Q123 2N5551 Q124 BC547B Q125 BC547B Q126 BD437 Q127 BD437 R101 MF1k00 R102 MF47k5 R103 MF1k00 R104 680k R105 680k R106 MF24k3 R107 1k5 R108 1k5 R109 1k 5 R110 5k R111 500O R112 NF 390O 5 R113 NF 680O 5 R114 MF787O R115 MF191O R116 MF191O R117 MF787O R118 NF68O 1 R119 10O 5 R120 NF68O 1 R121 10O 5 R122 1O 5 R123 1O 5 R125 W 22O 5 R127 W 22O 5 R129 W 22O 5 R131 NF220 5 R133 NF220 5 R135 NF220 5 R137 NF220 5 R139 NF220 5 PARTS LIST POWER CIRCUIT AND SHORT CIRCUIT PROTECTION MODEL PAM300 DRW N 33 0012PL REV DATE 081193 SHEET 3 OF 3 REPLACED BY REFERENCE VALUE R141 NF220 5 R143 W 22O 5 R145 W 22O 5 R147 W 22O 5 R148 NF2 2O 2 R149 6 8O R150 6 8O R151 10O 2 R152 W1k2 2 R153 W6 8O 5 R154 W1k2 2 R155 MF1k00 R156 MF487O R157 5k6 5 R158 8k2 5 R159 1k2 R160 22k R161 330k R162 10k R163 100O R164 3k3 R165 820O R166 330k R167 5k6 R168 5k6 5 R169 2k2 5 R170 MF5k23 R171 10k 5 R172 MF634 R173 MF1k00 R174 1k2 R175 8k2 5 R176 5k6 5 R177 MF487O R178 MF1k00 R179 22k R180 1k8 R181 1k2 R182 MF2k8 PARTS LIST INPUT CIRCUIT REV MODEL PAM300 DRW N 33 0211PL REPLACES DATE 091293 SHEET 1 OF 2 REPLACED BY REFERENCE DESCRIPT C201 220p C202 220p
19. 04 B3P VH J105 PROTEC J107 B5B XH J108 B5B XH J109 2600 3TS Q101 BF871 Q102 BF872 Q103 MJE15031 Q104 MJE15030 Q105 IRFP240 Q107 IRFP240 Q108 IRFP240 Q110 IRFP240 Q111 IRFP9240 Q113 IRFP9240 Q114 IRFP9240 Q116 IRFP9240 Q117 2N5401 Q118 2N5401 Q119 BC337 Q120 BC337 Q121 2N5551 Q122 2N5551 Q123 2N5551 Q124 BC547B Q125 BC547B Q126 BD437 Q127 BD437 R101 MF1k00 R102 MF47k5 R103 MF1k00 R104 680k R105 680k R106 MF33k2 R107 1k5 R108 1k5 R109 1k 5 R110 5k R111 500O R112 NF390O 5 R113 NF680O 5 R114 MF787O R115 MF191O R116 MF191O R117 MF787O R118 NF68O 1 R119 10O 5 R120 NF68O 1 R121 10O 5 R122 1O 5 R123 1O 5 R124 W 22O 5 R126 W 22O 5 R127 W 22O 5 R129 W 22O 5 PARTS LIST POWER CIRCUIT AND SHORT CIRCUIT PROTECTION MODEL PAM600 DRW N 33 0009PL REV DATE 081193 SHEET 3 OF 3 REPLACED BY REFERENCE VALUE R130 NF330O 5 R132 NF330O 5 R133 NF330O 5 R135 NF330O 5 R136 NF330O 5 R138 NF330O 5 R139 NF330O 5 R141 NF330O 5 R142 W 22O 5 R144 W 22O 5 R145 W 22O 5 R147 W 22O 5 R148 NF2 2O 2 R149 6 8O R150 6 8O R151 10O 2 R152 W1k5 4 R153 W6 8O 5 R154 W1k5 4 R155 MF1k00 R156 MF487O R157 5k6 5 R158 8k2 5 R159 1k8 R160 22k R161 330k R162 10k R163 100O R164 3k3 R165 820O R166 330k R167 5k6 R168 5k6 5 R169 1k8 5 R170 MF3k65 R171 10k 5 R172 MF487O R173 MF1k00 R174 1k8 R175 8k2 5 R176
20. 09 C15p C210 C8p2 C211 10 35 C212 C15p C213 C8p2 C214 10 35 C215 C100n C216 C100n D201 1N4148 D202 1N4148 D203 1N4148 D204 1N4148 D205 1N4148 D206 1N4148 D207 1N4148 D208 1N4148 D209 1N4148 D210 1N4148 D211 Z18 1 D212 Z18 1 IC201 NE5532A IC202 TL072 J201 YKF52 5003 J202 YKF52 5005 J203 B3P VH J204 YKF52 5003 J205 YKF52 5005 J206 2600 6TS J207 2600 6TS J208 B3P VH J209 2600 7TS J210 B5P VH J211 B5P VH L201 68 H L202 68 H L203 68 H L204 68 H R201 MF1k00 R202 MF1k00 R203 W1k8 7 R204 W1k8 7 R205 MF1k00 R206 MF1k00 R207 MF23k7 R208 MF47k5 R209 MF23k7 R210 MF47k5 R211 MF23k7 PARTS LIST INPUT CIRCUIT MODEL PAM1400 1000 DRW No 33 0002PL REV DATE 081193 SHEET 2 OF 2 REPLACES REPLACED BY REFERENCE VALUE R212 MF47k5 R213 MF23k7 R214 MF47k5 R215 MF1k00 R216 MF1k00 R217 MF340k R218 56 R219 MF1k00 R220 MF340k R221 MF1k00 R222 56 R223 1k5 R224 1k5 R225 1k5 S601 17 155 WIRE 27 WIRE 27 WIRE 27 WIRE 27 CTO 11 0497 8 CTO FRA CU PARTS LIST ATTENUATOR CIRCUIT MODEL PAM1400 1000 600 300 DRW No 33 0003PL REV DATE 081193 SHEET 1 OF 1 REPLACES REPLACED BY REFERENCE VALUE J501 B4P S VH J502 B4P S VH R501 10A10k R502 10A10k CTO 11 0502 CTO FRA CU PARTS LIST LEDS CIRCUIT MODEL PAM1400 1000 600 300 DRW No 33 0005PL REV DATE 081193 SHEET 1 OF 1 REPLACES REPLACED BY REFERENCE VALUE D701
21. 104 4N32 IC105 LM35D J101 FASTON 6 3mm J102 FASTON 6 3mm J103 FASTON 6 3mm J104 B3P VH J105 B3P VH J107 B5B XH J108 B5B XH J109 2600 3TS Q101 BF871 Q102 BF872 Q103 MJE15031 Q104 MJE15030 Q106 IRFP240 Q107 IRFP240 Q108 IRFP240 Q109 IRFP240 Q110 IRFP240 Q112 IRFP9240 Q113 IRFP9240 Q114 IRFP9240 Q115 IRFP9240 Q116 IRFP9240 Q117 2N5401 Q118 2N5401 Q119 BC337 Q120 BC337 Q121 2N5551 Q122 2N5551 Q123 2N5551 Q124 BC547B Q125 BC547B Q126 BD437 Q127 BD437 R101 MF1k00 R102 MF47k5 R103 MF1k00 R104 680k R105 680k R106 MF43k2 R107 1k5 R108 1k5 R109 1k5 5 R110 5k R111 500O R112 NF 390O 5 R113 NF 680O 5 R114 MF787O R115 MF191O R116 MF191O R117 MF787O R118 NF68O 1 R119 10O 5 PARTS LIST POWER CIRCUIT AND SHORT CIRCUIT PROTECTION MODEL PAM1000 DRW No 33 0008PL REV A DATE 000621 SHEET 3 OF 4 REPLACES REPLACED BY REFERENCE VALUE R120 NF68 1 R121 10O 5 R122 1O 5 R123 1O 5 R125 W 22O 5 R126 W 22O 5 R127 W 22O 5 R128 W 22O 5 R129 W 22O 5 R131 NF330O 5 R132 NF330O 5 R133 NF330O 5 R134 NF330O 5 R135 NF330O 5 R137 NF330O 5 R138 NF330O 5 R139 NF330O 5 R140 NF330O 5 R141 NF330O 1 R143 W 22O 5 R144 W 22O 5 R145 W 22O 5 R146 W 22O 5 R147 W 22O 5 R148 NF2 2O 2 R149 6 8O R150 6 8O R151 10O 2 R152 W1k8 7 R153 W6 8 5 R154 W1k8 7 R155 MF1k00 R156 MF487 R157 5k6 5 R158 8k2 5 R159 2k2 R160 22k
22. 169 2k2 5 R170 MF5k23 R171 10k 5 R172 MF634 R173 MF1k00 R174 1k2 R175 8k2 5 R176 5k6 5 R177 MF487O R178 MF1k00 R179 22k R180 1k8 R181 1k2 R182 MF2k8 PARTS LIST POWER CIRCUIT AND SHORT CIRCUIT PROTECTION MODEL PAM300 DRW N 33 0012PL REV DATE 081193 SHEET 1 OF 3 REPLACED BY REFERENCE VALUE C101 47 100 C102 C100n C103 10 50 C104 10 50 C105 C15p C106 C100n C107 C100n C108 C100n C109 C82p C110 C82p C111 47 100 C112 47 100 C113 100n 400 C114 47n 400 C115 47 50 C116 47 50 C117 680n C118 680n C119 220n 100 C120 220n 100 C121 220n 100 C122 220n 100 C123 220n 100 C124 220n 100 C125 680n C126 680n C127 1 63 C128 100 25 CTO 11 0504 CTO FRA CU D101 Z3 6 1 D102 Z3 6 1 D103 Z11 1 D104 Z11 1 D106 Z12 D108 Z12 D110 Z12 D112 Z12 D114 Z12 D116 Z12 D117 Z13 1 D118 Z13 1 D119 Z13 1 D120 Z13 1 D121 Z13 1 D122 1N4148 D123 1N4148 D124 Z10 1 D125 Z15 D126 TL431 F101 TI 10A F102 TI 10A IC101 5534N IC102 TIL112 IC103 TIL112 IC104 4N32 IC105 LM35D J101 FASTON 6 3mm J102 FASTON 6 3mm PARTS LIST POWER CIRCUIT AND SHORT CIRCUIT PROTECTION MODEL PAM300 DRW N 33 0012PL REV DATE 081193 SHEET 2 OF 3 REPLACED BY REFERENCE VALUE J103 FASTON 6 3mm J104 B3P VH J105 B3P VH J107 B5B XH J108 B5B XH J109 2600 3TS Q101 BF871 Q102 BF872 Q103 MJE15031 Q104 MJE15030 Q106 IRFP240 Q108 IRFP24
23. 2 Z3 6 1 D103 Z11 1 D104 Z11 1 D105 Z12 D106 Z12 D107 Z12 D108 Z12 D109 Z12 D110 Z12 D111 Z12 D112 Z12 D113 Z12 D114 Z12 D115 Z12 D116 Z12 D117 Z30 1 D118 Z30 1 D119 Z30 1 D120 Z30 1 D121 Z30 1 D122 1N4148 D123 1N4148 D124 Z27 1 D125 Z10 D126 TL431 F101 TI 16A F102 TI 16A IC101 5534N IC102 4N35 PARTS LIST POWER CIRCUIT AND AND SHORT CIRCUIT PROTECTION MODEL PAM1400 DRW N 33 0001PL REV A DATE 000621 SHEET 2 OF 4 REPLACED BY REFERENCE VALUE IC103 4N35 IC104 4N32 IC105 LM35D J101 FASTON 6 3mm J102 FASTON 6 3mm J103 FASTON 6 3mm J104 INPUT J105 PROTEC J107 B5B XH J108 B5B XH J109 2600 3TS Q101 BF871 Q102 BF872 Q103 MJE15031 Q104 MJE15030 Q105 IRFP240 Q106 IRFP240 Q107 IRFP240 Q108 IRFP240 Q109 IRFP240 Q110 IRFP240 Q111 IRFP9240 Q112 IRFP9240 Q113 IRFP9240 Q114 IRFP9240 Q115 IRFP9240 Q116 IRFP9240 Q117 2N5401 Q118 2N5401 Q119 BC337 Q120 BC337 Q121 2N5551 Q122 2N5551 Q123 2N5551 Q124 BC547B Q125 BC547B Q126 BD437 Q127 BD437 R101 MF1k00 R102 MF47k5 R103 MF1k00 R104 680k R105 680k R106 MF51k1 R107 1k5 R108 1k5 R109 1k5 5 R110 5k R111 500O R112 NF 390O 5 R113 NF 680O 5 R114 MF787O R115 MF191O R116 MF191O R117 MF787O R118 NF120O 1 R119 10O 5 R120 NF120O 1 PARTS LIST POWER CIRCUIT AND AND SHORT CIRCUIT PROTECTION MODEL PAM1400 DRW N 33 0001PL REV A DATE 000621 SHEET 3 OF 4 REP
24. 2 OF 4 REPLACES REPLACED BY REFERENCE VALUE IC102 TIL112 IC103 TIL112 IC104 4N32 IC105 LM35D J101 FASTON 6 3mm J102 FASTON 6 3mm J103 FASTON 6 3mm J104 B3P VH J105 B3P VH J107 B5B XH J108 B5B XH J109 2600 3TS Q101 BF871 Q102 BF872 Q103 MJE15031 Q104 MJE15030 Q106 IRFP240 Q107 IRFP240 Q108 IRFP240 Q109 IRFP240 Q110 IRFP240 Q112 IRFP9240 Q113 IRFP9240 Q114 IRFP9240 Q115 IRFP9240 Q116 IRFP9240 Q117 2N5401 Q118 2N5401 Q119 BC337 Q120 BC337 Q121 2N5551 Q122 2N5551 Q123 2N5551 Q124 BC547B Q125 BC547B Q126 BD437 Q127 BD437 R101 MF1k00 R102 MF47k5 R103 MF1k00 R104 680k R105 680k R106 MF43k2 R107 1k5 R108 1k5 R109 1k5 5 R110 5k R111 500O R112 NF 390O 5 R113 NF 680O 5 R114 MF787O R115 MF191O R116 MF191O R117 MF787O R118 NF68O 1 R119 10O 5 PARTS LIST POWER CIRCUIT AND SHORT CIRCUIT PROTECTION MODEL PAM1000 DRW No 33 0008PL REV DATE 081193 SHEET 3 OF 4 REPLACES REPLACED BY REFERENCE VALUE R120 NF68 1 R121 10O 5 R122 1O 5 R123 1O 5 R125 W 22O 5 R126 W 22O 5 R127 W 22O 5 R128 W 22O 5 R129 W 22O 5 R131 NF330O 5 R132 NF330O 5 R133 NF330O 5 R134 NF330O 5 R135 NF330O 5 R137 NF330O 5 R138 NF330O 5 R139 NF330O 5 R140 NF330O 5 R141 NF330O 1 R143 W 22O 5 R144 W 22O 5 R145 W 22O 5 R146 W 22O 5 R147 W 22O 5 R148 NF2 2O 2 R149 6 8O R150 6 8O R151 10O 2 R152 W1k8 7 R153 W6 8 5 R154
25. 3 JP J104 JP J105 JP J106 JP J107 JP J108 JP J109 JP J110 JP J111 JP MJ J112 JP MJ J113 JP MJ J114 JP J115 JP J116 JP J117 JP J118 JP J119 JP J120 JP J121 JP J122 JP J123 JP MJ J124 JP MJ J125 JP MJ R101 MF68k1 R102 MF68k1 R103 MF34k0 R104 MF54k9 R105 MF54k9 R106 MF27k4 R107 MF45k3 R108 MF45k3 R109 MF22k1 R110 MF34k0 R111 MF34k0 R112 MF16k9 R113 56 R114 MF68k1 R115 MF68k1 R116 MF34k0 R117 MF54k9 R118 MF54k9 R119 MF27k4 PARTS LIST LOW PASS FILTER MODEL FA2 LP DRW No 33 0085PL REV DATE 291194 SHEET 2 OF 2 REPLACES REPLACED BY REFERENCE VALUE R120 MF45k3 R121 MF45k3 R122 MF22k1 R123 MF34k0 R124 MF34k0 R125 MF16k9 R126 56 PC 11 0536 PRINTED CIRCUIT PARTS LIST HIGH PASS FILTER MODEL FA2 HP DRW No 33 0084PL REV DATE 291194 SHEET 1 OF 2 REPLACES REPLACED BY REFERENCE VALUE IC101 TL072 IC102 TL072 C101 100n C102 22 35 C103 47n C104 47n C105 47n C106 100n C107 22 35 C108 47n C109 47n C110 47n J101 2600 7TS J102 JP JUMPER PIN J103 JP J104 JP J105 JP MJ J106 JP J107 JP J108 JP J109 JP MJ J110 JP J111 JP J112 JP J113 JP MJ J114 JP J115 JP J116 JP J117 JP MJ J118 JP J119 JP J120 JP J121 JP MJ J122 JP J123 JP J124 JP J125 JP MJ R101 MF16k9 R102 MF13k7 R103 MF11k3 R104 MF8k45 R105 MF68k1 R106 MF53k6 R107 MF45k3 R108 MF34k0 R109 MF34k0 R110 M
26. 58 8k2 5 R159 1k8 R160 22k R161 330k R162 10k R163 100O R164 3k3 R165 820O R166 330k R167 5k6 R168 5k6 5 R169 1k8 5 R170 MF3k65 R171 10k 5 R172 MF487O R173 MF1k00 R174 1k8 R175 8k2 5 R176 5k6 5 R177 MF487 R178 MF1k00 R179 22k R180 1k8 R181 1k8 R182 MF3k65 PARTS LIST POWER CIRCUIT AND SHORT CIRCUIT PROTECTION MODEL PAM600 DRW N 33 0009PL REV DATE 081193 SHEET 1 OF 3 REPLACED BY REFERENCE VALUE C101 47 100 C102 C100n C103 10 50 C104 10 50 C105 C15p C106 C100n C107 C100n C108 C100n C109 C68p C110 C68p C111 47 100 C112 47 100 C113 100n 400 C114 47n 400 C115 47 50 C116 47 50 C117 680n C118 680n C119 220n 100 C120 220n 100 C121 220n 100 C122 220n 100 C123 220n 100 C124 220n 100 C125 680n C126 680n C127 1 63 C128 100 25 CTO 11 0504 CTO FRA CU D101 Z3 6 1 D102 Z3 6 1 D103 Z11 1 D104 Z11 1 D105 Z12 D107 Z12 D108 Z12 D110 Z12 D111 Z12 D113 Z12 D114 Z12 D116 Z12 D117 Z18 1 D118 Z18 1 D119 Z18 1 D120 Z18 1 D121 Z18 1 D122 1N4148 D123 1N4148 D124 Z18 1 D125 Z15 D126 TL431 F101 TI 12 5 F102 TI 12 5 IC101 5534N IC102 TIL112 IC103 TIL112 IC104 4N32 IC105 LM35D PARTS LIST POWER CIRCUIT AND SHORT CIRCUIT PROTECTION MODEL PAM600 DRW N 33 0009PL REV DATE 081193 SHEET 2 OF 3 REPLACED BY REFERENCE VALUE J101 FASTON 6 3mm J102 FASTON 6 3mm J103 FASTON 6 3mm J1
27. A O SUPPLY CONTROL to the module which cuts by means of Q119 Q120 and IC102 the operational s power supply This is the way to insure a fast and safe cut of the Id current in the MOSFETs around 80 s time because they stop receiving their respective reference voltages and consequently their Vgs polarization voltages so they are cut The circuit is shown in figure 9 and its operation is very simple When the A O SUPPLY CONTROL 10V signal appears the Q119 transistor starts conducting shortcircuiting to ground the positive power supply of the operational On the other hand the signal is also applied to the IC102 s LED opto TIL112 4N35 which puts its internal transistor and Q120 into conduction connecting the negative power supply of the operational to ground 6 7 8 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 2 F 4 The Zobel Network eliminates possible oscillations of the MOSFETs between 5MHz and 10MHz too This is why it must be physically placed at the module s output avoiding long wiring Great care must be taken for the signal not to be too shifted at the output because the feedback could turn negative FEEDBACK The
28. AGRAM MODEL PAM1400 1000 DRW No 32 0001PL REV DATE 091293 SHEET 1 OF 1 REPLACES REPLACED BY QUANTITY VALUE 4 METAL WASHER 5x11 5x0 8 4 WASHER AT 5x11 5x3 5 ABS BLACK 1 FUSE 16A 6x32TI PO90610 1 BOX PAM1400 2 POLIETILENE PROTECTOR M940 1 CASE MANUAL 21 5x32 5 1 PLASTIC BAG 75x65 1 BAG 60x80 1 MANUAL PAM1400 1 WARRANTY CARD PARTS LIST POWER CIRCUIT AND SHORT CIRCUIT PROTECTION MODEL PAM1000 DRW No 33 0008PL REV A DATE 000621 SHEET 1 OF 4 REPLACES REPLACED BY REFERENCE VALUE C101 47 100 C102 C100n C103 10 50 C104 10 50 C105 C15p C106 C100n C107 C100n C108 C100n C109 C47p C110 C47p C111 47 100 C112 47 100 C113 100n 400 C114 47n 400 C115 47 50 C116 47 50 C117 680n C118 680n C119 220n 100 C120 220n 100 C121 220n 100 C122 220n 100 C123 220n 100 C124 220n 100 C125 680n C126 680n C127 1 63 C128 100 25 CTO 11 0504 CTO FRA CU D101 Z3 6 1 D102 Z3 6 1 D103 Z11 1 D104 Z11 1 D106 Z12 D107 Z12 D108 Z12 D109 Z12 D110 Z12 D112 Z12 D113 Z12 D114 Z12 D115 Z12 D116 Z12 D117 Z24 1 D118 Z24 1 D119 Z24 1 D120 Z24 1 D121 Z24 1 D122 1N4148 D123 1N4148 D124 Z24 1 D125 Z15 1 D126 TL431 F101 TI 16A F102 TI 16A IC101 5534N PARTS LIST POWER CIRCUIT AND SHORT CIRCUIT PROTECTION MODEL PAM1000 DRW No 33 0008PL REV A DATE 000621 SHEET 2 OF 4 REPLACES REPLACED BY REFERENCE VALUE IC102 4N35 IC103 4N35 IC
29. C203 47 25 C204 C100n C205 47 25 C206 C100n C207 220p C208 220p C209 C15p C210 C8p2 C211 10 35 C212 C15p C213 C8p2 C214 10 35 C215 C100n C216 C100n CTO 11 497 8 CTO FRA CU D201 1N4148 D202 1N4148 D203 1N4148 D204 1N4148 D205 1N4148 D206 1N4148 D207 1N4148 D208 1N4148 D209 1N4148 D210 1N4148 D211 Z18 1 D212 Z18 1 IC201 NE5532A IC202 TL072 J201 YKF52 5003 J202 YKF52 5005 J203 B3P VH J204 YKF52 5003 J205 YKF52 5005 J206 2600 6TS J207 2600 6TS J208 B3P VH J209 2600 7TS J210 B5P VH J211 B5P VH L201 68 H L202 68 H L203 68 H L204 68 H R201 MF1k00 R202 MF1k00 R203 W1k2 2 R204 W1k2 2 R205 MF1k00 R206 MF1k00 R207 MF23k7 R208 MF47k5 R209 MF23k7 R210 MF47k5 PARTS LIST INPUT CIRCUIT REV MODEL PAM300 DRW N 33 0211PL REPLACES DATE 091293 SHEET 2 OF 2 REPLACED BY REFERENCE DESCRIPT R211 MF23k7 R212 MF47k5 R213 MF23k7 R214 MF47k5 R215 MF1k00 R216 MF1k00 R217 MF340k R218 56 R219 MF1k00 R220 MF340k R221 MF1k00 R222 56 R223 1k5 R224 1k5 R225 1k5 S601 17 155 WIRE 27 WIRE 27 WIRE 27 WIRE 27 PARTS LIST LOW PASS FILTER MODEL FA2 LP DRW No 33 0085PL REV DATE 291194 SHEET 1 OF 2 REPLACES REPLACED BY REFERENCE VALUE IC101 TL072 IC102 TL072 C101 100n C102 22 35 C103 47n C104 12n C105 47n C106 100n C107 22 35 C108 47n C109 12n C110 47n J101 2600 7TS J102 JP JUMPER PIN J10
30. C305 10 50 C306 10 50 C307 100n C308 100n C309 470n C310 470n C311 10 50 C312 10 35 C313 10 35 C314 100n C315 22 35 C316 2 2 35 C317 10 50 C318 2 2 35 C319 220 25 C320 10 50 C321 220 25 C322 47 16 C323 100n C324 10 35 C325 10 35 C326 100n C327 100n C328 100n C329 100n C330 100n C331 100n D301 BAS16 D302 Z4 7 D303 Z9 1 1 D304 BAV70 D306 TL431 D307 BAS16 D308 BAS16 D309 Z8 2 D310 Z8 2 D311 1N4007 D312 Z8 2 D313 Z5 6 D314 BAV99 D315 BAS16 D316 BAV99 D317 BAV99 D321 1N4007 D322 Z8 2 D323 Z8 2 D324 1N4007 D325 Z8 2 D326 Z5 6 D327 B250C1000 PARTS LIST PROTECTIONS CIRCUIT MODEL PAM1400 DRW No 33 0007PL REV DATE 241293 SHEET 2 OF 4 REPLACES REPLACED BY REFERENCE VALUE FAN FAST 2 8 GND FAST 2 8 IC301 7805 IC302 7805 IC305 LM358D IC306 LM358D IC307 HEF4001B IC308 HEF4011B IC309 HEF4520B IC310 HEF4538B IC311 HEF4538B IC312 HEF4001B INSULANT WASHER R19 INSULANT WASHER R19 J302 FAST 6 3 J303 FAST 6 3 J304 B6P VH J305 B6P VH J306 FAST 6 3 J307 FAST 6 3 J309 B3P VH J310 B3P VH J311 B3P VH K301 E 3209 6000 K302 E 3209 6000 MA301 MAGNET MA302 MAGNET MA303 MAGNET MA304 MAGNET NUT M3 NUT M3 PL N 1777 RADIATOR Q301 BC847B Q302 2N5551 Q303 2N5551 Q304 2N5401 Q305 BC817 Q307 BC847B Q308 2N5551 Q308 2N5551 Q309 2N5551 Q310 2N5401 R1 680 R10 100k R11 39
31. EPLACED BY REFERENCE VALUE WIRE 5 WIRE 5 WIRE 6 WIRE 6 CTO 11 0500 CTO FRA CU J901 FASTON 6 3 J902 FASTON 6 3 J903 FASTON 6 3 J904 FASTON 6 3 J905 FASTON 6 3 J906 FASTON 6 3 J907 FASTON 6 3 J908 FASTON 6 3 PARTS LIST PROTECTIONS CIRCUIT MODEL PAM600 300 DRW No 33 0013PL REV DATE 241293 SHEET 1 OF 4 REPLACES REPLACED BY REFERENCE VALUE AC FAST 2 8 AC FAST 2 8 C301 2200 35 C302 10 50 C303 10 50 C304 100n C305 10 50 C306 10 50 C307 100n C308 100n C309 470n C310 470n C311 10 50 C312 10 35 C313 10 35 C314 100n C315 22 35 C316 2 2 35 C317 10 50 C318 2 2 35 C319 220 25 C320 10 50 C321 220 25 C322 47 16 C323 100n C324 10 35 C325 10 35 C326 100n C327 100n C328 100n C329 100n C330 100n C331 100n D301 BAS16 D302 Z4 7 D303 Z9 1 1 D304 BAV70 D306 TL431 D307 BAS16 D308 BAS16 D309 Z8 2 D310 Z8 2 D311 1N4007 D312 Z8 2 D313 Z5 6 D314 BAV99 D315 BAS16 D316 BAV99 D317 BAV99 D321 1N4007 D322 Z8 2 D323 Z8 2 D324 1N4007 D325 Z8 2 D326 Z5 6 D327 B250C1000 PARTS LIST PROTECTIONS CIRCUIT MODEL PAM600 300 DRW No 33 0013PL REV DATE 241293 SHEET 2 OF 4 REPLACES REPLACED BY REFERENCE VALUE FAN FAST 2 8 GND FAST 2 8 IC301 7805 IC302 7805 IC305 LM358D IC306 LM358D IC307 HEF4001B IC308 HEF4011B IC309 HEF4520B IC310 HEF4538B IC311 HEF4538B IC312 HEF4001B INSULANT
32. F27k4 R111 MF22k1 R112 MF16k9 R113 56 R114 MF16k9 R115 MF13k7 R116 MF11k3 R117 MF8k45 R118 MF68k1 R119 MF53k6 PARTS LIST HIGH PASS FILTER MODEL FA2 HP DRW No 33 0084PL REV DATE 291194 SHEET 2 OF 2 REPLACES REPLACED BY REFERENCE VALUE R120 MF45k3 R121 MF34k0 R122 MF34k0 R123 MF27k4 R124 MF22k1 R125 MF16k9 R126 56 W101 10mm W102 10mm PC 11 0535 PRINTED CIRCUIT
33. K R12 100k R13 100k R14 68K R15 100 R2 100k R3 39K R301 2K2 R302 680 R303 7K50 R304 90K9 R305 15K PARTS LIST PROTECTIONS CIRCUIT MODEL PAM1400 DRW No 33 0007PL REV DATE 241293 SHEET 3 OF 4 REPLACES REPLACED BY REFERENCE VALUE R306 7K50 R307 90K9 R308 15K R309 10K R310 1K R311 2K7 R312 1K43 R313 604 R314 10K R315 1K R316 2M2 R317 2M2 R318 5K6 R319 5K6 R320 332K R321 332K R322 590K R323 226K R324 5K6 R325 5K6 R326 4K7 R327 100k R328 6K8 R329 6K8 R330 560 R331 100K R332 100k R333 100k R334 10K R335 100k R336 5K6 R337 10K R338 100k R339 10K R340 680K R341 680K R342 1M2 R343 1M2 R344 100 R345 100 R346 68K R347 47K R348 100k R349 100k R350 10K R351 5K6 R352 4K7 R353 590K R354 332K R355 332K R356 226K R357 5K6 R358 100k R359 6K8 R360 6K8 R361 560 PARTS LIST PROTECTIONS CIRCUIT MODEL PAM1400 DRW No 33 0007PL REV DATE 241293 SHEET 4 OF 4 REPLACES REPLACED BY REFERENCE VALUE R362 100k R363 100k R364 100k R365 39K R366 39K R4 6K8 R5 6K8 R6 4K7 R7 4K7 R8 6K8 R9 6K8 SCREW M3X8 DIN7985 NINE SCREW M3X8 DIN7985 NINE WASHER ADE M3 WASHER ADE M3 PC 11 0411 PRINTED CIRCUIT PROFESSIONAL PAM SERIES TESTING RULES PRELIMINARY GROUND LINK Testing Verify that when the switch is at the ON position there is continuity between the chassis ground and the speakers ground terminal an
34. LACED BY REFERENCE VALUE R121 10O 5 R122 6 8O 5 R123 6 8O 5 R124 W 22O 5 R125 W 22O 5 R126 W 22O 5 R127 W 22O 5 R128 W 22O 5 R129 W 22O 5 R130 NF330O 5 R131 NF330O 5 R132 NF330O 5 R133 NF330O 5 R134 NF330O 5 R135 NF330O 5 R136 NF330O 5 R137 NF330O 5 R138 NF330O 5 R139 NF330O 5 R140 NF330O 5 R141 NF330O 5 R142 W 22O 5 R143 W 22O 5 R144 W 22O 5 R145 W 22O 5 R146 W 22O 5 R147 W 22O 5 R148 NF2 2O 2 R149 6 8O R150 6 8O R151 10O 2 R152 W1k8 7 R153 W6 8O 5 R154 W1k8 7 R155 MF1k00 R156 MF487 R157 5k6 5 R158 8k2 5 R159 2k7 R160 22k R161 330k R162 10k R163 100O R164 3k3 R165 820 R166 330k R167 10k R168 10k 5 R169 4k7 5 R170 MF5k62 R171 27k 5 R172 MF464 R173 MF1k00 R174 2k7 R175 8k2 5 R176 5k6 5 R177 MF487 R178 MF1k00 PARTS LIST POWER CIRCUIT AND AND SHORT CIRCUIT PROTECTION MODEL PAM1400 DRW N 33 0001PL REV A DATE 000621 SHEET 4 OF 4 REPLACED BY REFERENCE VALUE R179 22k R180 1k R181 2k7 CTO 11 0504 CTO FRA CU PARTS LIST POWER CIRCUIT AND AND SHORT CIRCUIT PROTECTION MODEL PAM1400 DRW N 33 0001PL REV DATE 081193 SHEET 1 OF 4 REPLACED BY REFERENCE VALUE C101 47 100 C102 C100n C103 10 50 C104 10 50 C105 C15p C106 C100n C107 C100n C108 C100n C109 C39p C110 C39p C111 47 100 C112 47 100 C113 100n 400 C114 47n 400 C115 47 50 C116 47 50 C117 680n C118
35. LANT CARTON PL N 03 0067 8 INSULANT SARCON N 03 0059 1 RADIATOR Z 11269 2 RADIATOR N 2906 6 1 SUPPORT RADIATOR N 00 1961 PARTS LIST PACKING DIAGRAM REV MODEL PAM600 300 DRW N 32 0002PL REPLACES DATE 091293 SHEET 1 OF 1 REPLACED BY QUANTITY DESCRIPT 4 METAL WASHER 5x11 5x0 8 4 WASHER AT 5x11 5x3 5 ABS BLACK 1 FUSE 16A 6x32TI PO90610 1 BOX PAM1400 2 POLIETILENE PROTECTOR M940 1 CASE MANUAL 21 5x32 5 1 PLASTIC BAG 75x65 1 BAG 60x80 1 MANUAL PAM1400 1 WARRANTY CARD 2 POLIETILENE SEPARATOR PARTS LIST POWER CIRCUIT AND SHORT CIRCUIT PROTECTION MODEL PAM300 DRW N 33 0012PL REV A DATE 000621 SHEET 1 OF 3 REPLACED BY REFERENCE VALUE C101 47 100 C102 C100n C103 10 50 C104 10 50 C105 C15p C106 C100n C107 C100n C108 C100n C109 C82p C110 C82p C111 47 100 C112 47 100 C113 100n 400 C114 47n 400 C115 47 50 C116 47 50 C117 680n C118 680n C119 220n 100 C120 220n 100 C121 220n 100 C122 220n 100 C123 220n 100 C124 220n 100 C125 680n C126 680n C127 1 63 C128 100 25 CTO 11 0504 CTO FRA CU D101 Z3 6 1 D102 Z3 6 1 D103 Z11 1 D104 Z11 1 D106 Z12 D108 Z12 D110 Z12 D112 Z12 D114 Z12 D116 Z12 D117 Z13 1 D118 Z13 1 D119 Z13 1 D120 Z13 1 D121 Z13 1 D122 1N4148 D123 1N4148 D124 Z10 1 D125 Z15 D126 TL431 F101 TI 10A F102 TI 10A IC101 5534N IC102 4N35 IC103 4N35 IC104 4N32 IC105 LM35D J101 FASTON 6 3mm J102 FASTON
36. NF120O 1 R119 10O 5 R120 NF120O 1 PARTS LIST POWER CIRCUIT AND AND SHORT CIRCUIT PROTECTION MODEL PAM1400 DRW N 33 0001PL REV DATE 081193 SHEET 3 OF 4 REPLACED BY REFERENCE VALUE R121 10O 5 R122 6 8O 5 R123 6 8O 5 R124 W 22O 5 R125 W 22O 5 R126 W 22O 5 R127 W 22O 5 R128 W 22O 5 R129 W 22O 5 R130 NF330O 5 R131 NF330O 5 R132 NF330O 5 R133 NF330O 5 R134 NF330O 5 R135 NF330O 5 R136 NF330O 5 R137 NF330O 5 R138 NF330O 5 R139 NF330O 5 R140 NF330O 5 R141 NF330O 5 R142 W 22O 5 R143 W 22O 5 R144 W 22O 5 R145 W 22O 5 R146 W 22O 5 R147 W 22O 5 R148 NF2 2O 2 R149 6 8O R150 6 8O R151 10O 2 R152 W1k8 7 R153 W6 8O 5 R154 W1k8 7 R155 MF1k00 R156 MF487 R157 5k6 5 R158 8k2 5 R159 2k7 R160 22k R161 330k R162 10k R163 100O R164 3k3 R165 820 R166 330k R167 10k R168 10k 5 R169 4k7 5 R170 MF5k62 R171 27k 5 R172 MF464 R173 MF1k00 R174 2k7 R175 8k2 5 R176 5k6 5 R177 MF487 R178 MF1k00 PARTS LIST POWER CIRCUIT AND AND SHORT CIRCUIT PROTECTION MODEL PAM1400 DRW N 33 0001PL REV DATE 081193 SHEET 4 OF 4 REPLACED BY REFERENCE VALUE R179 22k R180 1k R181 2k7 CTO 11 0504 CTO FRA CU PARTS LIST PROTECTIONS CIRCUIT MODEL PAM1400 DRW No 33 0007PL REV DATE 241293 SHEET 1 OF 4 REPLACES REPLACED BY REFERENCE VALUE AC FAST 2 8 AC FAST 2 8 C301 2200 35 C302 10 50 C303 10 50 C304 100n
37. PAM1400 1000 600 300 SERVICE MANUAL SERVICE MANUAL PAM1400 1000 600 300 INDEX BLOCK DIAGRAM SCHEMATICS COMPONENTS LOCATION SCHEMA TESTING AND QUALITY CONTROL TECHNICAL CHARACTERISTICS WIRING DIAGRAM MECHANICAL DIAGRAM PACKING DIAGRAM 1 MODULE CIRCUIT 11 0504B 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 Frequency response can be optimized with an external compensation capacity for several applications unity gain amplifier capacitive load slew rate low overshoot etc Characteristics Small signal bandwidth 10Mhz Output drive capability 600 10V rms at Vs 18V Input noise voltage 4nV Hz DC voltage gain 100000 AC voltage gain 6000 at 10KHz Power bandwidth 200KHz Slew rate 13V s Supply voltage range 3 to 20V POWER SUPPLY The BF871 and BF872 transistors are mounted in a common base configuration in a current source structure The current sources have a double function polarizing the gate source links in the MOSFETs to the limit of the conduction and moving the voltage variations at the operational output which are refered to ground to voltage variations refered to high voltage power supply The polarization poin
38. PLACES REPLACED BY REFERENCE VALUE R362 100k R363 100k R364 100k R365 39K R366 39K R4 6K8 R5 6K8 R6 0 R7 0 R8 6K8 R9 6K8 SCREW M3X8 DIN7985 NINE SCREW M3X8 DIN7985 NINE WASHER ADE M3 WASHER ADE M3 PC 11 0411 PRINTED CIRCUIT PARTS LIST MECHANICAL DIAGRAM REV C MODEL PAM600 300 DRW N 300004PL REPLACES DATE 180297 SHEET 1 OF 1 REPLACED BY QUANTITY DESCRIPT 10 SCREW 2 9x6 5 DIN7981 2 SCREW 3 5x6 5 DIN 7981 34 SCREW M4x6 SPANLO DIN7985 5 SCREW M4x12 DIN7985 1 SCREW M4x20 DIN7985 4 SCREW M4x10 SPANLO DIN966 4 SCREW M4x8 TX SPIRALFORM 4 SCREW M4x6 DIN7985 10 METAL WASHER ADE M4 1 METAL WASHER 4 2x9x0 5 4 METAL WASHER 4x7x0 5 2 METAL WASHER 4 2x9x1 5 9 NUT M4 DIN934 2 METAL WASHER AND NUT POTENTIOMETER 1 RIVET NUT M4 PSM 1 GROUND TERMINAL N 00 1761 1 SECURITY WASHER M4 3 NYLON RIVET 1303 4 MINIATURE SUPPORT MSP 6N 4 SEPARATOR N 00 1636 4 BASE 11x25 1 FUSE HOLDER 6x32 1 COMMUTATOR N 17 120 4 SUPPORT LKC 4 FLANGE T 50L 1 TRANSFORMER REF 18Z160 19Z130 WIT ASSEMBLY KIT 1 FAN REF NMB3110NL 04W B50 1 CHASSIS WD 00 2367 1 CHASSIS WD 00 2366 1 HANDLE ASSEMBLY WD 00 2369 1 COVER WD 00 2375 1 UPPER FRONT PANEL WD 00 2364 1 LOWER FRONT PANEL WD 00 2365 1 FAN PROTECTOR 80x80mm 1 HANDLE ASSEMBLY N 00 1962 1 SCREW M4x10 DIN7500C ZNBL 1 CHASSIS WD 00 2307 6 SCREW 2 9x13 DIN7982 PARTS LIST MECHANICAL DIAGRAM REV MODEL PAM600 300 DRW N 300004PL REPLACES DATE 021293 SHEET 1 OF 1
39. REW 2 9x6 5 DIN7981 2 SCREW 3 5x6 5 DIN 7981 36 SCREW M4x6 SPANLO DIN7985 5 SCREW M4x12 DIN7985 1 SCREW M4x20 DIN7985 4 SCREW M4x10 SPANLO DIN966 6 SCREW M4x8 TX SPIRALFORM 4 SCREW M4x6 DIN7985 10 METAL WASHER ADE M4 1 METAL WASHER 4 2x9x0 5 6 METAL WASHER 4x7x0 5 4 METAL WASHER 4 2x9x1 5 9 NUT M4 DIN934 2 METAL WASHER AND NUT POTENTIOMETER 1 RIVET NUT M4 PSM 1 GROUND TERMINAL N 00 1761 1 SECURITY WASHER M4 3 NYLON RIVET 1303 4 MINIATURE SUPPORT MSP 6N 6 SEPARATOR N 00 1636 4 BASE 11x25 1 FUSE HOLDER 6x32 1 COMMUTATOR N 17 120 4 SUPPORT LKC 4 FLANGE T 50L 1 TRANSFORMER REF 21U212 20Z194 WIT ASSEMBLY KIT 1 FAN REF NMB4515 PL 04W B30 1 CHASSIS WD 00 2372 1 CHASSIS WD 002371 2 HANDLE ASSEMBLY WD 00 2374 1 COVER WD 00 2375 1 UPPER FRONT PANEL WD 00 2364 1 LOWER FRONT PANEL WD 00 2370 1 PROTECTOR FAN LZ 20 1 SCREW M4x10 DIN7500C ZNBL 1 CHASSIS WD 00 2307 6 SCREW 2 9x13 DIN7982 PARTS LIST MECHANICAL DIAGRAM MODEL PAM1400 1000 DRW No 30 0001PL REV DATE 021293 SHEET 1 OF 1 REPLACED BY QUANTITY VALUE 10 SCREW 2 9x6 5 DIN7981 2 SCREW 3 5x6 5 DIN 7981 36 SCREW M4x6 SPANLO DIN7985 5 SCREW M4x12 DIN7985 1 SCREW M4x20 DIN7985 4 SCREW M4x10 SPANLO DIN966 6 SCREW M4x8 TX SPIRALFORM 4 SCREW M4x6 DIN7985 10 METAL WASHER ADE M4 1 METAL WASHER 4 2x9x0 5 6 METAL WASHER 4x7x0 5 4 METAL WASHER 4 2x9x1 5 9 NUT M4 DIN934 8 NUT M5 DIN934 4 METAL WASHER 5 2x10x1 2 METAL WASHER AND NUT POTENTIOMETER 1 RIVET NUT M4 PSM 1 GRO
40. UND TERMINAL N 00 1761 1 SECURITY WASHER M4 3 NYLON RIVET 1303 4 MINIATURE SUPPORT MSP 6N 6 SEPARATOR N 00 1636 4 BASE 11x25 1 FUSE HOLDER 6x32 1 COMMUTATOR N 17 120 4 SUPPORT LKC 4 FLANGE T 50L 1 TRANSFORMER REF 21U212 30Z194 WIT ASSEMBLY KIT 1 FAN REF NMB4515 PL 04W B30 1 CHASSIS N 00 1965 1 CHASSIS N 00 1964 2 HANDLE ASSEMBLY N 00 1966 1 COVER N 00 1963 1 UPPER FRONT PANEL N 00 1956 1 LOWER FRONT PANEL N 00 1958 2 JOINED CONNECTOR LOUDSPEAKER 1 PROTECTOR FAN LZ 20 PARTS LIST ASSEMBLY MODULE MODEL PAM1400 1000 DRW No 30 0002PL REV DATE 101293 SHEET 1 OF 1 REPLACES REPLACED BY QUANTITY VALUE 3 METAL WASHER 3 2X6X0 5 2 INSULANT WASHER R19 2 MICA TO 220 2 MICA TO 126 1 WIRE N 9 4 SCREW M3X8 SPIRALFORM DIN7985 4 SCREW M3X15 SPIRALFORM DIN 7985 4 NYLON SEPARATOR 3 6X6 4 4 SCREW M4X6 SPANLO DIN7985 2 RIVET NUT M3X3 2 ACCESSORY PL N 1775 2 SCREW M3X8 DIN7985 2 WASHER ADE M3 2 ACCESSORY PL N 1915 4 CARTON WASHER 3 2X6X1 1 INSULANT CARTON PL N 03 0067 1 RADIATOR Z 10585 2 RADIATOR N 2906 6 2 INSULANT SARCON 116x20mm 1 SUPPORT RADIATOR N 00 1961 PARTS LIST ASSEMBLY FILTER CAPACITOR MODEL PAM1400 1000 600 300 DRW No 30 0003PL REV DATE 091293 SHEET 1 OF 1 REPLACED BY QUANTITY VALUE 4 SCREW M5x10 DIN933 1 SCREW M4x8 DIN7985 4 METAL WASHER 5x10x0 5 1 WASHER ADE M4 4 SECURITY WASHER M5 1 RIVET NUT M4 PSM 1 GROUND CHASSIS N 00 1634 2 ADHESIVE RIBBON 20mm PARTS LIST PACKING DI
41. W1k8 7 R155 MF1k00 R156 MF487 R157 5k6 5 R158 8k2 5 R159 2k2 R160 22k R161 330k R162 10k R163 100O R164 3k3 R165 820 R166 330k R167 10k R168 10k 5 R169 3k3 5 R170 MF5k62 R171 27k 5 R172 MF464 R173 MF1k00 R174 2k2 R175 8k2 5 R176 5k6 5 R177 MF487 R178 MF1k00 R179 22k PARTS LIST POWER CIRCUIT AND SHORT CIRCUIT PROTECTION MODEL PAM1000 DRW No 33 0008PL REV DATE 081193 SHEET 4 OF 4 REPLACES REPLACED BY REFERENCE VALUE R180 1k R181 2k2 PARTS LIST PROTECTIONS CIRCUIT MODEL PAM1000 DRW No 33 0014PL REV DATE 241293 SHEET 1 OF 4 REPLACES REPLACED BY REFERENCE VALUE AC FAST 2 8 AC FAST 2 8 C301 2200 35 C302 10 50 C303 10 50 C304 100n C305 10 50 C306 10 50 C307 100n C308 100n C309 470n C310 470n C311 10 50 C312 10 35 C313 10 35 C314 100n C315 22 35 C316 2 2 35 C317 10 50 C318 2 2 35 C319 220 25 C320 10 50 C321 220 25 C322 47 16 C323 100n C324 10 35 C325 10 35 C326 100n C327 100n C328 100n C329 100n C330 100n C331 100n D301 BAS16 D302 Z4 7 D303 Z9 1 1 D304 BAV70 D306 TL431 D307 BAS16 D308 BAS16 D309 Z8 2 D310 Z8 2 D311 1N4007 D312 Z8 2 D313 Z5 6 D314 BAV99 D315 BAS16 D316 BAV99 D317 BAV99 D321 1N4007 D322 Z8 2 D323 Z8 2 D324 1N4007 D325 Z8 2 D326 Z5 6 D327 B250C1000 PARTS LIST PROTECTIONS CIRCUIT MODEL PAM1000 DRW No 33 0014PL
42. WASHER R19 INSULANT WASHER R19 J302 FAST 6 3 J303 FAST 6 3 J304 B6P VH J305 B6P VH J306 FAST 6 3 J307 FAST 6 3 J309 B3P VH J310 B3P VH J311 B3P VH K301 E 3209 4000 K302 E 3209 4000 MA301 MAGNET MA302 MAGNET MA303 MAGNET MA304 MAGNET NUT M3 NUT M3 PL N 1777 RADIATOR Q301 BC847B Q302 2N5551 Q303 2N5551 Q304 2N5401 Q305 BC817 Q307 BC847B Q308 2N5551 Q308 2N5551 Q309 2N5551 Q310 2N5401 R1 680 R10 100k R11 39K R12 100k R13 100k R14 68K R15 100 R2 100k R3 39K R301 2K2 R302 680 R303 7K50 R304 90K9 R305 15K PARTS LIST PROTECTIONS CIRCUIT MODEL PAM600 300 DRW No 33 0013PL REV DATE 241293 SHEET 3 OF 4 REPLACES REPLACED BY REFERENCE VALUE R306 7K50 R307 90K9 R308 15K R309 10K R310 1K R311 2K7 R312 1K43 R313 604 R314 10K R315 1K R316 2M2 R317 2M2 R318 5K6 R319 5K6 R320 332K R321 332K R322 590K R323 226K R324 5K6 R325 5K6 R326 0 R327 100k R328 6K8 R329 6K8 R330 560 R331 100K R332 100k R333 100k R334 10K R335 100k R336 5K6 R337 10K R338 100k R339 10K R340 680K R341 680K R342 1M2 R343 1M2 R344 100 R345 100 R346 68K R347 47K R348 100k R349 100k R350 10K R351 5K6 R352 0 R353 590K R354 332K R355 332K R356 226K R357 5K6 R358 100k R359 6K8 R360 6K8 R361 560 PARTS LIST PROTECTIONS CIRCUIT MODEL PAM600 300 DRW No 33 0013PL REV DATE 241293 SHEET 4 OF 4 RE
43. al gate source voltages As the bias current of the N MOSFETs must be identical to the one of the P MOSFETs the feedback will correct the continuous voltage at the operational output to polarize the MOSFETs with different voltages until both conduct equal currents If the operational output is not 0 V its capacity to give voltage and current is not the same in both senses To avoid this we must put a symmetry adjust It is just an adjust which allows to vary the collector resistance of one of the current sources R111 The symmetry adjust does not correct the asymmetrical clipping saturation of the power amplifier with real load This happens because the conduction resistors Ron of the MOSFETs N and P are not equal Channel P has a higher Ron than channel N This characteristic depends on the MOSFET s physical construction POWER MOSFETs The MOSFETs used are IRFP9240 P and IRFP240 N They are assembled in a common source configuration so they can be completely saturated This kind of configuration has two drawbacks compared to a common drain one less stability because of the configuration gain itself and high output impedance in open loop The source resistances 0 22 are needed for the MOSFETs to work in parallel E g Two MOSFETs excited by the same Vgs voltage gate source voltage of 5V If they have different transconductance curves Id function Vgs they will conduct different drain currents let s say 1A and 3A The second o
44. circuit that configures the fast ones is made of D120 D121 D123 R174 R175 R176 R177 R178 R179 C127 Q122 and Q123 for the N channel There is also an equivalent circuit in the P channel These start working when there is a sudden current variation because of a shortcircuit or a transitory The reaction time from the exact moment when these things occur to when the current stops circulating through the MOSFETs is about 80 s The time constant is given by C127 R174 and R179 and the load circuit made by the LED diode of the IC104 opto coupler Please note that in order for the protection to be activated Q122 and Q123 must conduct simultaneously through which R174 is linked to negative power supply being C127 1 F loaded very quickly through this resistance activating the LED of the opto coupler sending a pulse to the protection circuit which will open the corresponding channel s relay being this way the output from the power amplifier disconnected from the load 0 in this case Q122 together with the zeners and the base polarization resistances configure the voltage detector this group is in parallel with the Vds voltage of the N MOSFET Id C B A Vds 5 Q123 together with the resistances which make the base divider configure the current detector this divider takes its voltage from one of the source resistances of a N MOSFET which is proportional to the current circulating through itself The threshold separat
45. d that the opposite happens at the OFF position Leave it at ON Put the power amplifier in stereo mode We will need a 1800VA variac for our test purposes Take off one of the fuses of the module in which the testing is being made and connect an ammeter 10A DC scale in its place Put the oscilloscope probe between TP GND SET UP Unplug the fuses of the module that we are NOT setting up Connect the power amplifier mains cable to the output of the variac Set the variac output at 0V Switch the power amplifier on with no load or signal Turn the variac up progressively step by step until 220V While mains voltage is growing up make sure the module s current does never exceed 0 8A Once the circuit is stable make sure the current is 480mA 400mA 320mA 240mA respectively for PAM1400 PAM1000 PAM600 PAM300 and the symmetry measured up with the oscilloscope probe is 50mV If your figures do not match these numbers adjust CURRENT 5K and SYMMETRY 470 until you get the above mentioned numbers Test the operational amplifier power supply 18V 1V Put the fuse back in its place into the module with the power amplifier turned off and repeat the same procedure for the other channel CROSS DISTORTION By using a signal generator introduce a level of 100mV RMS at 1kHz and make sure there is no cross distortion at the output attenuators at 0dB position MOSFETS CONDUCTION By using a signal generator introduce a level of 0 5V at 1kHz
46. ing zone A from zone B is determinated by the D125 zener When this zener stops working and there is no current circulating through it because the Vds voltage is lower let s remember this circuit is also in parallel with this voltage or what is the same the load voltage grows because it is not 0O anymore and has a given value like 0 5 to 1 and the help given by D126 stops so more current will be needed for the shot We have climbed the first stair of the stairway of the SOA graphic When the zeners D124 and D118 stop working because the load voltage goes on growing values higher than 1 or what is the same the Vds decreases the Q125 transistor does not receive current anymore in its base and so it is shorted allowing Q124 to enter conduction This way R172 stays in parallel with the base emitter of Q121 making up a voltage divider with R173 This divider will climb another stair of the stairway and enter the ZONE C The link between the module s protection circuit and the relays control circuit is made through IC103 and IC104 which are as mentioned earlier opto couplers just to insulate the existing high voltages at the power amplifying module 90V in the case of the PAM1400 and the power supply voltage of the existing logic circuits in the relays control card Once the pulse generated by the protections is detected the control circuitry resident in the protection card appart from opening the corresponding relay returns the signal
47. ne will dissipate more power and will get hotter The use of source resistances tends to match the current that each of the MOSFETs connected in parallel is conducting 4 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 Intercalating serial resistances and ferrite beads at the gate this possibility is minimized because the Q of the LC network made by the inductances and gate source capacity is reduced PROTECTION CIRCUIT The protection circuit monitors the dissipated power at the MOSFETs stage It has two basic parts MOSFET Id current detection MOSFET Vds voltage detection The goal is limiting the MOSFET so it works inside an area close to the SOA as indicated in the figure We chose channel N because due to construction reasons its SOA is lower ZONE A This zone is for very low loads around 0 As the load voltage is very low the voltage held by the MOSFET will always be high The protections should be activated with very low current Fast protections and some of the slow ones are working in this zone The
48. ng the tipical turn on STANDBY time for each of the disconnections of the relays because of the protections shooting Let s take into account that the system is locked after the fifth disconnection PARTS LIST ANTICLIP CIRCUIT MODEL PAM1400 1000 600 300 DRW No 33 0004PL REV A DATE 180595 SHEET 1 OF 1 REPLACES REPLACED BY REFERENCE VALUE C401 2 2 63 C402 2 2 63 C403 22pF D401 Z10 D402 1N4148 D403 1N4148 D404 1N4148 D405 1N4148 H401 VTL5C8 IC401 TL071 J401 O5JQ BT J402 JP J403 JP MJ J404 JP J405 O5JQ BT R401 10 R402 MF20k0 R403 MF100k R404 22k R405 22k R406 100 R407 1k5 R408 3k3 R409 3k9 R410 10 R411 1k PC 11 0503B PRINTED CIRCUIT PARTS LIST ANTICLIP CIRCUIT MODEL PAM1400 1000 600 300 DRW No 33 0004PL REV DATE 081193 SHEET 1 OF 1 REPLACES REPLACED BY REFERENCE VALUE C401 2 2 63 C402 2 2 63 D401 Z10 D402 1N4148 D403 1N4148 D404 1N4148 D405 1N4148 H401 VTL5C8 IC401 TL071 J401 O5JQ BT J402 TP J403 TP MJ J404 TP J405 O5JQ BT R401 10 R402 MF20k0 R403 MF100k R404 22k R405 22k R406 1k2 R407 470 R408 2k R409 2k7 R410 10 PC 11 0503 PRINTED CIRCUIT PARTS LIST INPUT CIRCUIT MODEL PAM1400 1000 DRW No 33 0002PL REV DATE 081193 SHEET 1 OF 2 REPLACES REPLACED BY REFERENCE VALUE C201 220p C202 220p C203 47 25 C204 C100n C205 47 25 C206 C100n C207 220p C208 220p C2
49. onding relay open This output is also connected to the THERMAL LEDs which light up as the relays are open Note that each time the relay is open through any of the variables which act upon it the PROTECT LED must light up The circuit acting over this LED is made of R327 R328 R329 R4 R5 and Q303 When Q302 stops conducting open relay Q303 receives its base current through R327 R326 R6 and the relay s coil putting this transistor into saturation This way the LED is linked to the power supply V by means of the group of resistances R328 R329 R4 and R5 12 DC OUT CIRCUIT The circuit shown in the figure corresponds to the DC OUT of channel L The goal of this circuit is protecting the loudspeakers when because of a module fail there is some DC appearing at the output The voltages indicated in the figure correspond to rest state and they are given by the dividers made of R320 R322 and R332 R323 The resistances R323 R322 are linked by their extreme to the leg 7 Q of the monostable IC310 4538 which has 10V at rest state On the other hand R320 R321 are linked by their extreme to the L output which in these conditions has 0V respect to ground If we apply Ohm s Law to these dividers we will obtain the above mentioned voltages Let s remember briefly the function of a NOR gate like the HEF4001B A B C 0 0 1 0 1 0 1 0 0 1 1 0 Let s suppose there is a continuous voltage appearing at the module output because of
50. onds to its fader DC OUT For this test you must disconnect the load from the amplifier Introduce a 1V signal at 5Hz with the generator Turn the output of the generator up until the protection relays open and close MONO STEREO Make this test with a load of 8 connected between left and right channels terminals Set the MONO STEREO switch in MONO Verify that the fader of channel 1 is operating while channel 2 is NOT operating Verify that the MONO LED is lighten up Check the signal cut over the load is clean Set the amplifier back to STEREO mode PROTECTIONS Disconnect the amplifier from the load and introduce with the signal generator a level of approximately 100mV RMS at 1KHz Leave the attenuators at 0dB and shortcircuit the left channel output just for a while checking the PROTECT LED is lighting up and the relay opens the circuit you can check this by placinf an oscilloscope probe at the amplifier s output and watching the signal disappear during the STAND BY time in which the protection circuit is working Repeat the same process for the right channel Set the amplifier in MONO mode in the same way as previously Shortcircuit both channel output terminals L and R just for a while Any of both channels must go into protect mode lighting the corresponding LED and making the relay open the circuit PROFESSIONAL PAM SERIES QUALITY CONTROL We will use a mixer with balanced output if possible and a nominal output level of 1V as the
51. signal source for test purposes Connect the mixer outputs to the power amplifier inputs Plug the power amplifier to mains make sure its specified voltage matches that of mains and make sure that PROTECT ON and SIGNAL PRESENT LEDs all light up when you turn on the amplifier by pushing the ON button Turn up the mixer output level untill the CLIP LEDs light up on the power amplifier Turn down the mixer output and connect the loudspeakers Make an exhaustive test of Sound quality no distorsions or noises Faders action fader travel signal cut at their low end no scratching or clicking noises and correct stereo channel for each one Cooling fan operation While the power amplifier is working shake it or throw it a table to make sure the output sound goes on playing correctly Shortcircuit the power amplifier output and make sure the corresponding channel s PROTECT LED lights up the relay opens and the output signal is cut for a short period of time STAND BY and returned back into normal operation Repeat the same procedure four times more and then the STAND BY time should be about 5 minutes Repeat the same steps for the other channel TECHNICAL CHARACTERISTICS PAM300 PAM600 PAM1000 PAM1400 Frequency response at max power output 7Hz to 60kHz 0 1dB Harmonic distortion noise from 20Hz to 20kHz meas band 0 02 0 02 0 02 0 02 Intermodulation distortion SMPTE using frequencies of 50Hz and 7kHz at 4 1 ratio nominal
52. sition This translates into a logical 1 at the Q2 leg of the counter a 0 at the NAND IC308 output this zero makes a 1 at the output of the next NAND giving a result of 0 at the collector of Q301 so Q302 is not conducting and the relay K301 remains open It will stay this way until the reset from the monostable happens or there is a manual mains disconnection by pushing the power off button The reset circuit associated with the monostable is made of C320 D320 R339 and D318 above we have always been refering to channel L By means of diodes D317 and D318 we build an O gate with which we apply any of the above mentioned reset pulses to the counter 16 17 STANDBY MONOSTABLE The only thing left is the function of the monostable made of IC310 4538 Like the counter and the monostable IC311 4538 this circuit is connected to the PROTECT SIGNAL too Its output is 1 in rest state and becomes 0 during an approximate time of 1 3 seconds which is given by the constant RC of the circuit R341 C316 This leads to two situations First putting a 0 in one of the legs of the NAND IC308 generates the immediate opening the relay as we have seen before On the other hand the voltage divider of the DC OUT circuit is put off balance The monostable time is calculated to be long enough to unload the capacities of C312 and C313 This way we get a DC OUT circuit initialization as we had done a manual reset disconnection from mains causi
53. t is calculated so the voltage dropout in Rc R112 R111 is the limit voltage of conduction of the MOSFETs 2 to 3V enough to carry the bias current If we modulate in AC the base emitter voltage the Ic and VRc will vary proportionally In our configuration as the reference voltage Vref is constant it is a part of the operational power supply we add the operational output voltage to the transistors emitter through Re R107 R108 The Rc value fixes the source output impedance We do not recommend to raise it higher than 1K because of frequency response and slew rate reasons This voltage circuit s gain is as usual in a common base configuration with Rc Re emitter resistor 0 45 2 BIAS CURRENT ADJUST The bias current adjust is performed through the variable resistor connected between the emitters of the current sources R110 5K 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 In order to adjust the bias current the adjustable resistor must be varied until a current of about 80mA circulates through each MOSFET So for instance for a PAM1400 in which there are six MOSFETs it will be 80 x 6 480mA The bias current depends on the MOSFETs temperature and the stabilizing circuit transistors temperature TEMPERATURE STABILIZING CIRCUIT
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