Electro-Voice CPS 3 Service Manual
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Electro-Voice CPS 3 Service Manual

Contractor precision series
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SERVICE MANUAL
CPS 4
CONTRACTOR PRECISION SERIES

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  • Page 1 SERVICE MANUAL CPS 4 CONTRACTOR PRECISION SERIES...
  • Page 2 SPECIFICATIONS Technical Specifications: CPS3, CPS4 Amplifier at rated conditions, both channels driven with 8 ohms loads, unless otherwise specified. CPS3 CPS4 8 Ω 4 Ω 2 Ω 8 Ω 4 Ω 2 Ω Load Impedance Maximum Midband Output Power 560W 900W 1200W 850W 1300W 1800W THD=1%, 1kHz...
  • Page 3 SPECIFICATIONS: CPS3 entire unit Measuring Standard IEC 268 part 3IHF-A 0 dBu = 775 mV (RMS) POWER SUPPLY 1. voltage supply 2. nominal supply voltage, depending on the model: 100V/120V/230V/240V 3. nominal mains frequency: 50 - 60 Hz 4. nominal power consumption (2x800W/4Ω): 2950 W 5.
  • Page 4 FREQUENCY RESPONSE • -3 dB level drop, referenced to the level at the standard frequency of 1 kHz • the power amplifier's border frequencies are at 13 Hz and 40 kHz respectively, referenced to -1 dB Amplification frequency response Input Output f (u) f (o)
  • Page 5 DIMENSIONS Height : 132.5 mm (3 HU) Width : 483 mm Depth : 426 mm WEIGHT m = 27 kg EXTENSIONS optionally available 2 x input transformer NRS 90176 MEASURED SPECIFICATIONS: CPS3 entire unit Measurement conditions, unless differently specified: ∆X = ±1.5 dB •...
  • Page 6 Settings / Adjustments 4.1. IDLING CURRENT ADJUSTMENT Connect the DC-volt meter at the BIAS measuring points (refer to table) and adjust the idling current via the trim potentiometer (on the printed board assembly 84158). Adjust both channels of the power amplifier A&B. Setting Measuring point 1 Measuring point 2...
  • Page 7 Function test 5.1. OUTPUT - offset voltage DC-voltage measuring at the loudspeaker outputs CHANNEL A/B with U(DC) ≤ ±10 mV. 5.2 LIMITER 5.2.1. Attenuation test Both channels separately driven with a 1 kHz signal up to U(A) = 71 V (without load). Increase the input voltage by 10 dB.
  • Page 8 5.7. DC-VOLTAGE-PROTECTION TEST • HI/LO-Cut off, Limiter set to SLOW testing has to be performed for both channels of the power amplifier individually: drive the power amplifier with a test signal (f = 7 Hz) and without load resistor connected. at an input voltage of approx.
  • Page 9 Amplitude - Non-Linearity • testing with load resistor 8 ohms, dual mode • MDW = 80 kHz • input sensitivity = 0 dBu • power amplifier's condition as shipped from the factory Measurement at nominal voltage at nominal voltage Remarks U(A) = 63.2 V U(A) = 20 V <...
  • Page 10 DAMPING FACTOR - internal >300 internal with f = 1 kHz 15. SLEW RATE >35 V/µs - internal Factory Defaults • Caution: make sure to ckeck these settings: Function Location Control State Setting Input Sensitivity L & P 86208/86212 Jumper J11/J21 plugged in 0 dBu Limiter Off Switch...
  • Page 11 SPECIFICATIONS: CPS4 entire unit Measuring Standard IEC 268 part 3IHF-A 0 dBu = 775 mV (RMS) POWER SUPPLY 1. voltage supply 2. nominal supply voltage, depending on the model: 120V/230V/240V 3. nominal mains frequency: 50 - 60 Hz 4. nominal power consumption (2x1200W/4Ω): 4100 W 5.
  • Page 12 FREQUENCY RESPONSE • -3 dB level drop, referenced to the level at the standard frequency of 1 kHz • the power amplifier's border frequencies are at 13 Hz and 40 kHz respectively, referenced to -1 dB Amplification frequency response Input Output f (u) f (o)
  • Page 13 MEASURED SPECIFICATIONS: CPS4 entire unit Measurement conditions, unless differently specified: ∆X = ±1.5 dB • tolerance of measured values: • measuring frequency: f = 1 kHz • stated levels refer to: U = 775 mV (0 dBu) • level controls set to their clockwise limits •...
  • Page 14 4.2. FLOATING - SYMMETRY Immediately after setting the idle current, a symmetry check of the floating voltage has to be performed. The power amplifier has to be operated in idling condition. DC-volt meters have to be connected between the measuring points 1 - 2, and 2 - 3. Using the FLOATING-trim potentiometers that are located on the printed board assembly 86207/86211, the floating voltage is set symmetric to the ground potential.
  • Page 15 5.2.2. LIMITER FAST/SLOW-Test • tests have to be performed for both channels of the power amplifier individually: testing has to be performed without load resistors connected. Drive the power amplifier with a burst signal (f = 1 kHz, 1-10 cycles, rate: ≈ 0.5 sec.) and U(E) = +10 dB above the nominal input voltage.
  • Page 16 Level CHANNEL A&B: • set the level control to its fully clockwise position. • set the INPUT ROUTING switch to: DUAL / STEREO. • HI-LOW-CUT switch is ON (as factory pre-set!). • BRIDGED MODE: NORMAL • LIMITER: SLOW (as factory pre-set!) •...
  • Page 17 Frequency Response AMPL(dBr) FREQ(Hz) 21 JUN 94 10:06:59 3.0000 -3.000 -6.000 -9.000 -12.00 -15.00 -18.00 -21.00 100k Plot 1: HI/LO-Cut on Plot 2: HI/LO-Cut off 12. Noise Interference - U(F) = external voltage un-weighted with B = 22 Hz … 22 kHz, effective value (IEC 268-1) - U(G) = noise voltage, frequency-weighting filter according to CCIR-468-3, quasi peak weighted (IEC 268-1) - U(A) = interference voltage A-weighted, dB(A), effective value (IEC 268-1) - Signal-to-noise ratio referenced to a nominal output voltage of 69.3 V (1200W/4ohms)
  • Page 30 Ersatzteilliste - Bill of Materials 170076 CPS 3 US 120V POWER-AMP Pos. Nr. Best. Nr. Ref. No. Part No. Bezeichnung Description Zubehör Accessories & packing material 341341 STECKER-SPEAKON 4POL speakon-connector 4-pole 349832 R-HAL.LI.L24/1600 RACKHALTE rack ear left 349833 R-HAL.RE.L24/1600 RACKHALTE...
  • Page 31 170076 CPS 3 US 120V POWER-AMP Pos. Nr. Best. Nr. Ref. No. Part No. Bezeichnung Description D0021 336399 LED RT 3MM TLUR 4401 LED red 3mm D0022 336398 LED GN 3MM TLHG 4400/01 LED green 3mm D0023 336399 LED RT...
  • Page 32 170076 CPS 3 US 120V POWER-AMP Pos. Nr. Best. Nr. Ref. No. Part No. Bezeichnung Description 00020 306838 SICHER-HALTER fuse holder 00025 306838 SICHER-HALTER fuse holder 852458 PCB+B"L1600/P2000 PCB assy 85245 supply B CN006 348676 STIFTLEISTE 3POL MLSS connector male 3-pin...
  • Page 33 170076 CPS 3 US 120V POWER-AMP Pos. Nr. Best. Nr. Ref. No. Part No. Bezeichnung Description CN021 343516 FL.STECKER 4.8/0.5 connector 4.8mm faston C0001 348846 KO-KER 680.0PF 500V 5% cap ceramic 680pF C0002 348846 KO-KER 680.0PF 500V 5% cap ceramic 680pF...
  • Page 34 170076 CPS 3 US 120V POWER-AMP Pos. Nr. Best. Nr. Ref. No. Part No. Bezeichnung Description Q0028 348422 TRANS MPSA 42 transistor MPSA 42 Q0029 348421 TRANS 2N 3906 transistor 2N 3906 Q0030 335763 TRANS 2N 3904 transistor 2N 3904...
  • Page 35 170076 CPS 3 US 120V POWER-AMP Pos. Nr. Best. Nr. Ref. No. Part No. Bezeichnung Description R0173 348847 WI-SO PTC C 1011 120 C 5% safety component PTC R0178 348847 WI-SO PTC C 1011 120 C 5% safety component PTC...
  • Page 36 170076 CPS 3 US 120V POWER-AMP Pos. Nr. Best. Nr. Ref. No. Part No. Bezeichnung Description C0040 301472 KO-EL 10.000MF 63V cap electrolytic 10uF/63V C0041 301472 KO-EL 10.000MF 63V cap electrolytic 10uF/63V C0042 301524 KO-KER 47.0PF 500V 10% cap ceramic 47pF...
  • Page 37 170076 CPS 3 US 120V POWER-AMP Pos. Nr. Best. Nr. Ref. No. Part No. Bezeichnung Description C0304 342361 KO-KER 47.0PF K 100V 2% cap ceramic 47pF C0305 327366 KO-EL 4.700MF 50V BIP cap bip electr. 4.7uF/50V C0306 342937 KO-FOL 1.000MF 63V 5%...
  • Page 38 170076 CPS 3 US 120V POWER-AMP Pos. Nr. Best. Nr. Ref. No. Part No. Bezeichnung Description D0209 329511 DIODZ BZX 55C 2V4 0.50W diode zener 2V4 D0233 301254 DIODE 1N 4148 AXIAL diode 1N 4148 D0234 301254 DIODE 1N 4148...
  • Page 39 170076 CPS 3 US 120V POWER-AMP Pos. Nr. Best. Nr. Ref. No. Part No. Bezeichnung Description Q0010 306928 TRANS BC 560 C transistor BC 560 C Q0011 306928 TRANS BC 560 C transistor BC 560 C 00010 301235 TRANS BD 242 B...
  • Page 40 170076 CPS 3 US 120V POWER-AMP Pos. Nr. Best. Nr. Ref. No. Part No. Bezeichnung Description Q0214 335763 TRANS 2N 3904 transistor 2N 3904 Q0215 335763 TRANS 2N 3904 transistor 2N 3904 Q0216 348421 TRANS 2N 3906 transistor 2N 3906...
  • Page 41 170076 CPS 3 US 120V POWER-AMP Pos. Nr. Best. Nr. Ref. No. Part No. Bezeichnung Description R0255 329215 WI-SI 10.00 OHM 0.30W 5% safety resistor 10 Ohm R0279 329215 WI-SI 10.00 OHM 0.30W 5% safety resistor 10 Ohm R0298 332306 WI-SCH 3.30 KOHM 2.00W 5%...
  • Page 42 R-HAL.LI.L24/1600 RACKHALTE rack ear left 349833 R-HAL.RE.L24/1600 RACKHALTE rack ear right 306465 STECKER XLR 3POL xlr-connector 3-pole 355709 OWNER'S MANUAL CPS 3/CPS 4 owner's manual CPS 3/4 353468 ABDECKUNG THX-ENDSTUFEN pot cover 349528 HUTSTOPFEN H7 18,5MM plug, hole 332652 KRT. L 2400...
  • Page 43 Page 2 / 12 170077 CPS 4 US 120V POWER-AMP Pos. Nr. Best. Nr. Ref. No. Part No. Bezeichnung Description CN006 330269 FL.STECKER 6.3/0.8 connector 6.3mm faston CN007 330269 FL.STECKER 6.3/0.8 connector 6.3mm faston CN018 343516 FL.STECKER 4.8/0.5 connector 4.8mm faston CN019 343516 FL.STECKER 4.8/0.5...
  • Page 44 Page 3 / 12 170077 CPS 4 US 120V POWER-AMP Pos. Nr. Best. Nr. Ref. No. Part No. Bezeichnung Description Q0016 331657 TRANS MJ 15022 transistor MJ 15022 Q0017 331657 TRANS MJ 15022 transistor MJ 15022 Q0018 351981 TRANS MJL 3281 A transistor MJL 3281 A Q0019 348409...
  • Page 45 Page 4 / 12 170077 CPS 4 US 120V POWER-AMP Pos. Nr. Best. Nr. Ref. No. Part No. Bezeichnung Description R0006 348632 WI-DR 2X 0.47 OHM 5.00W 5% resistor 2x 0.47 Ohm 5 watt R0039 348632 WI-DR 2X 0.47 OHM 5.00W 5% resistor 2x 0.47 Ohm 5 watt R0040 348632...
  • Page 46 Page 5 / 12 170077 CPS 4 US 120V POWER-AMP Pos. Nr. Best. Nr. Ref. No. Part No. Bezeichnung Description CN004 306395 FEDERLEISTE 2,5MM O 7POL connector female 7-pole CN007 344975 MESSERLST. 10POL connector male 10-pin CN02A 344975 MESSERLST. 10POL connector male 10-pin CN02B 344975...
  • Page 47 Page 6 / 12 170077 CPS 4 US 120V POWER-AMP Pos. Nr. Best. Nr. Ref. No. Part No. Bezeichnung Description C0111 326675 KO-EL 100.000MF 10V BIP cap bip electr. 100uF/10V C0112 342923 KO-FOL 0.220MF 63V 5% cap mylar 220nF C0113 335787 KO-KER 15.0PF 100V 2%...
  • Page 48 Page 7 / 12 170077 CPS 4 US 120V POWER-AMP Pos. Nr. Best. Nr. Ref. No. Part No. Bezeichnung Description C0600 301472 KO-EL 10.000MF 63V cap electrolytic 10uF/63V C0603 301472 KO-EL 10.000MF 63V cap electrolytic 10uF/63V C0610 301472 KO-EL 10.000MF 63V cap electrolytic 10uF/63V C0613 301472...
  • Page 49 Page 8 / 12 170077 CPS 4 US 120V POWER-AMP Pos. Nr. Best. Nr. Ref. No. Part No. Bezeichnung Description D0708 301254 DIODE 1N 4148 AXIAL diode 1N 4148 D0710 301254 DIODE 1N 4148 AXIAL diode 1N 4148 D0711 304360 DIODE 1N 4007 GEGURTET diode 1N 4002...
  • Page 50 Page 9 / 12 170077 CPS 4 US 120V POWER-AMP Pos. Nr. Best. Nr. Ref. No. Part No. Bezeichnung Description 00010 338869 TRANS MJE 350 transistor MJE 350 Q0107 348422 TRANS MPSA 42 transistor MPSA 42 Q0108 348422 TRANS MPSA 42 transistor MPSA 42 00010 338869...
  • Page 51 Page 10 / 12 170077 CPS 4 US 120V POWER-AMP Pos. Nr. Best. Nr. Ref. No. Part No. Bezeichnung Description 00010 338868 TRANS MJE 340 transistor MJE 340 Q0228 348421 TRANS 2N 3906 transistor 2N 3906 Q0229 335763 TRANS 2N 3904 transistor 2N 3904 Q0241 348421...
  • Page 52 Page 11 / 12 170077 CPS 4 US 120V POWER-AMP Pos. Nr. Best. Nr. Ref. No. Part No. Bezeichnung Description VR101 348486 WI-TRI 47.00 KOHM LIN pot trim 47k Ohm lin VR102 348675 WI-TRI 2.50 KOHM LIN pot trim 2.5k Ohm lin VR201 348486 WI-TRI 47.00 KOHM LIN...
  • Page 53 Page 12 / 12 170077 CPS 4 US 120V POWER-AMP Pos. Nr. Best. Nr. Ref. No. Part No. Bezeichnung Description 00010 306838 SICHER-HALTER fuse holder 00015 306838 SICHER-HALTER fuse holder 00020 306838 SICHER-HALTER fuse holder 00025 306838 SICHER-HALTER fuse holder 852438 PCB+B"L2400/3000 PCB assy 85243 supply B...

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