0 - Clear-Com
Contents
1. NO OPERATOR SERVICEABLE rs wg The following diagrams show how to properly connect unbalanced and balanced signals to the input connectors UNBALANCED TO SIGNAL SOURCE BALANCED 01 89 Rev 1 0 Page 4 of 16 Operating Instructions Clear Com 1020 Amplified Monitor Speaker 2 2 CONTINUED Input Connection The 1020 s enclosure connects directly to Earth ground through the AC power cord To reduce the possibility of ground hum signal common for the amplifiers is isolated from the enclosure Do not connect signal common to Earth ground Clear Com does not recommend ddriving both balanced and unbalanced inputs simultaneously If both types of inputs are loaded simultaneously the gain of the input amplifiers will change This may cause a premature overload condition although it will not damage the input stage 2 3 Meter Sensitivity Adjustment Model 1020M with optional level meters provides controls for adjusting the sensitivity of the meters The operator can adjust a OdB display reading for line levels of 20dBv to 8dBv unbalanced and 9dBv to 19dBv balanced The top cover of the 1020 contains an access hole for adjusting the sensitivity controls Use a small flat bladed Screwdriver and the following procedure to adjust 1 On one channel apply a lkHz input signal at the level at which you desire the meters to display O dB 2 Adjust the associated trimpot until the OdB reading is obtained2. which along with the associated precision components serves as a three pole low pass filter This filter is 3dB at 250Hz and 8 at 350Hz ICl Pin 1 feeds power amp IC3 A portion of IC3 s output is fed to the inverting input of IC4 To gether they form a 14 watt push pull output Trimmer Pl adjusts C4 s offset to match that cf IC3 output Operating Instructions Clear Com 1020 Amplified Monitor Speaker 4 1 CONTINUED Amplifier Module 710190 Power Supply on the output Two B power supply feeds are vided by Vl and V2 Vl is the high Miscellaneous current supply it feeds the audio For measurement and troubleshooting power amps and the display LEDs purposes test point 5 should be V2 supplies the low power circuits used as a ground reference point IC8 and resistors R35 and R36 com The mains selector switch is loca prise VB the 1 2 B bias supply ted near the AC power jack on the VB is fed to the non inverting main amplifier circuit board This inputs of all signali carrying switch allows powering of the unit amps This allows AC coupled input from 115 or 230 VAC mains signals to be biased at mid supply 4 2 Optional Display Module 710191 e The optional display module is IC2 is a precision full wave peak provided for line level indication detector Its output is integrated by R9 and C3 which determine the Input amplifier IC3 has an adjusta speed attack and decay of the ble gai
3. 3 Apply test signal to the remaining channel and repeat Steps 1 and 2 for second channel 2 4 Installing Attenuators for High Level Operation When driving the 1020 with extremely high input signals full volume may be achieved with only a partial turn of the volume control s This is due to the wide range of line levels the 1020 must accommodate Under these conditions Clear Com recommends the installation of an in line attenuator pad Commercially available in line attenuators are suitable as long as Pin 1 of the balanced input is not connected to the shell A pad can also be built for both balanced and unbalanced inputs refer to the following diagrams and resistor value charts 1 89 Rev 1 0 Page 5 6 Operating Instructions Clear Com 1020 Amplified Monitor Speaker BALANCED PIN 2 TO 1020 INPUT RESISTOR VALUE CHART Balanced Pad Attenuation Rl Value R2 Value 6dB 5 0k 10 0k lOdB 3 9k 3 9k 15dB 5 1k 2 2k 208 6 2k l 2k UNBALANCED TO 1020 INPUT COMMON RESISTOR VALUE CHART Unbalanced Pad Attenuation Rl Value 6dB 10 0k 18 8 2k 18 10 0k 20dB 12 0k 01 89 Rev 1 0 Page 6 of 16 Operating Instructions Clear Com 1020 Amplified Monitor Speaker 3 0 Troubleshootinq The 1020 Amplified Monitor Speaker can be tested and if necessary repaired with standard electronic bench equipment Signal paths can be traced and compared with the Test Signal chart shown in this section The technic
4. 510053 LINE VOLTAGE SELECTOR DPDT S1 HARDWARE 140002 HEATSINK FOR POWER AMPLIFIER 280157 1 4 IN X 200 4 ALUMINUM SPACER 280158 1 4 IN X 500 4 NYLON SPACER 91 89 Rev 1 0 Page 14 of 16 Operating Instructions Clsaz Com 1020 Amplified Monitor Speaker 6 0 Parts Lists continued 1020M DISPLAY MODULE ASSEMBLY 710191 REV C CCPN DESCRIPTION REF DESIGNATORS RESISTORS 410010 1 4w 5 1K OHMS 410016 1 4W 5 10K OHMS 410024 1 4w 5 100K OHMS 410032 1 4 5 18K OHMS 410038 1 4W 82 OHMS 410041 1 4W 1 2K OHMS 410071 1 4W 100 OHMS 410096 1 4W 820 OHMS 410137 1 4W 6 2K OHMS 410148 1 4W 100K OHMS 410149 1 48 200K OHMS 470019 50K TRIMPOT PIHER PT 10H 50K CAPACITORS 150003 UF MYLAR 100 20 150019 UF TANTALUM 35V 150081 UF 35V ELECTROLYTIC CAP 150116 UF 35V 20 R L DIODES 480000 1N4148 SIGNAL DIODE 480115 LED DISPLAY HP HDSP 4832 TRANSISTORS 480006 2N2222 TRANSISTOR 480007 2N2907 OR 2N4143 TRANSISTOR INTEGRATED CIRCUITS 480018 LM741 IC OP AMP 8 PIN DIP 480075 LM358 DUAL GND SENSING OP AMP 480114 LM3916N BAR DISPLAY DRIVER HARDWARE 210155 10 PIN RT ANGLE HEADER 1 CTR 210172 20 PIN RT ANG SOCKET ARIES 20 823 90 280151 ANGLE BRACKET 4 40 01 89 Rev 1 0 Page 15 of 16 Operating Instructions Clear Com 1020 Amplified Monitor Speaker 6 0 Parts Lists continued 1020 M CHASSIS CCPN DESCRIPTION HARDWARE 240015 KNOB VOLUME 250378 PLASTIC LENS FOR DISPLAY 280151 ANGLE BRACKET 4 40 280156 TINN
5. All readings in dBv unless otherwise stated All readings 8 1 X refers to Channel B 2 0 775 rms 3 When adjusting P4 P5 drive only channel A or B Input Freq Test Point Reading lkHz 35 dBv IC7 6 Pin 7 35 0 dBv IC7 6 Pin 3 39 0 IC7 6 Pin 1 8 5 10 9 Pin 5 21 0 IC10 9 Pin 7 21 0 IC10 9 Pin 1 20 0 Ic2 5 Pin 1 40 5 J4 81 to Gnd 0 5 180Hz IC1 Pin 5 19 5 Icl Pin 1 18 5 IC3 Pin 1 47 0 112 J8 to Gad P5 adjust for 8 Limiter enabled 8 to Gnd P4 adjust for 8 Limiter enabled 8 46 to J7 Pl adjust for 0 0 DC IC8 Pin 6 1 2 V2 DC 01 89 Rev 1 0 Page 8 of 16 Operating Instructions Clear Com 1020 Amplified Monitor Speaker 4 0 Circuit Description amp Block Diagram 4 1 Amplifier Module 710190 Input Input amplifier IC7 is a low gain high dynamic range buffer ampli fier Resistors R63 R65 and R69 Set the unbalanced stage gain at OdB The balanced stage gain is set at lldB This allows a maximum unbalanced input of approximately l5dBv before driving IC7 into the supply rail The maximum balanced input is limited to approximately 18dBv by the clamping diodes 013 through 018 The output of the input amplifier feeds volume control P2 which in turn is fed to the other half of IC7 the limiter amp Limiter Amp The limiter amp s function is to delay the onset of clipping of the output amplifiers caus
6. 1020 1020M Amplified Monitor Speaker INSTRUCTION and SERVICE MANUAL 945 Camelia St Berkeley California 95710 6 Clear Com 810110 1 4 89 REV A Operating Instructions Clear Com 1020 Amplified Monitor Speaker 01 89 Rev 0 TABLE OF CONTENTS A Note to Clear Com Users Introduction eee Installation Troubleshooting 7 Circuit Description Block Diagram 9 Specifications Parts Lists Schematics Page 1 of 16 Operating Instructions Clear Com 1020 Amplified Monitor Speaker A NOTE TO CLEAR COM USERS This manual will acquaint you with the operation and care of your Clear Com 1020 1020M Amplified Monitor Speaker To help assure years of satisfaction and reliability please read it carefully and follow the recommendations Upon receiving your shipment check immediately for box damage that may have occurred during shipment Notify the dealer and the freight carrier if you discover damages or losses so claims may be expedited Carefully unpack the units recommend you save the shipping cartons they re useful for re shipping Should you ever require service the Clear Com factory and your authorized Clear Com service center knows your equipment best and has the training and test equipment needed to restore equipment to peak performance Please feel free to contact your Clear Com dealer or the Clear Com factory for assistance at any time Thank you for selecting Clear C
7. ERMAN FASTENER 4 MISC 210157 XLR 3 PIN FEMALE CONNECTOR 210171 AC JACK SWITCHCRAFT EAC 311 500089 3INCH SQUARE SPEAKER 500102 6 IN SPEAKER FOR 1020 520025 3AG 1 2 AMP S B 520027 SQ BEZEL FUSEHOLDER 610002 AC POWER CABLE 810110 INSTRUCTION amp SERVICE MANUAL 01 89 Rev 1 0 Page 16 of 16 I3 1 4005 Su 2 SOA 21 21 90A 21 21 ZA 70 H2S 061017 N d HOS 061014 N d 08 D2 ASv 0610t N d DMG ASY dft L6tOLZ N d MOB 16101 N d SMO ASY SONWYHO 32N243338 NI 315 XS l 38Y 58015638 SOYHY JONDIM NI 03157 34v SINTA SWOlDvdVv2 TY 34v 3000 Tv 031312395 Ss3 Mn SJON 15 31455 Outre 382434 97 314 DONY Sie 13141234 351 5 39nva3701 0314120345 35 10 SS31Nn SILON 530010 Ny 1 NY Z 0 01 SOYuvYJOU2IM NI 03151 S3Q1YA TIY 550151533 NI 31 XS w l 540 83XY3dS YOLINON Y 3AIMJav 1 1 3205 1779 b 250610 Dv 5 53 31 AITIUNN 00 50103 WX Y 0 HOS 16101 N d HOS 161014 N d NOG 8 ASV 16101 N d 31 Av1dSIO 061016 N d HOG 2 ASY 061014 N d IMO ASY 3 GAY SONMYYO 3DN333438 6 27 ASZ ASE 0022 0022
8. K OHMS 410147 1 4W 150K OHMS 410150 1 4W 1 5M OHMS 470018 50K TRIMPOT 10 50 470034 50K TRIMPOT BECKMAN 91AR50K 470039 50K POT LINEAR CTS KL925 CAPACITORS 150005 10 50v 150006 DISC 10 150009 TANTALUM 35V 150019 TANTALUM 35V 150029 DISC 150VAC UL APPROVED 150033 DISC 5 50V 150035 MONOLYTHIC 10 50 01 89 Rev 1 0 Page 13 of 16 Operating Instructions Clear Com 1020 Amplified Monitor Speaker 6 0 Parts Lists continued 1020 M AMPLIFIER MODULE ASSEMBLY 710190 REV C continued CCPN DESCRIPTION REF DESIGNATORS CAPACITORS 150043 MONOLYTHIC 10 50 C68 C15 C51 C59 0588 7 024 C19 2 150080 MONOLYTHIC 10 100V C29 clO 6 150082 MONO 5 10 50V 150095 UF 2 100V POLY C67 5 150098 PF 10 50V 150099 UF ELECTROLYTIC 25V 20 R L C18 ell 150120 UF 25V LYTIC R L C34 C33 150121 UF 25V LYTIC R L C28 C22 150122 01 UF 2 100V POLY c52 150123 UF 2 100V POLY 150124 1 UF 2 100V POLY DIODES 480000 1N4148 SIGNAL DIODE 480005 1N5401 RECTIFIER DIODE LOOPIV TRANSISTORS 480079 J174 P CHANNEL JFET INTEGRATED CIRCUITS 480018 LM74l IC OP AMP 8 PIN DIP IC8 480070 NE5532 DUAL LO NOISE OP AMP 1010 7 480113 LM383T AUDIO POWER AMP IC4 IC3 TRANSFORMERS 560019 POWER XFMR SIGNAL LP 24 2000 Tl 560020 10K 10K AUDIO TRANSFORMER T3 CONNECTORS 210080 P C QUICK CONNECT TAB 3 16 J4 210112 MULTI PIN HEADER 1 CTR Jl4 210157 XLR 3 PIN FEMALE INSERT J11 210170 RCA PC MOUNT J10 SWITCHES
9. SQA 9 BA A 0 n m z 2v18 20 21 21 20A 21 21 TROON 062 A0CZ 0002 WHOIS A 4 1 083 NO C3LNNON Dae 1 FAINGON 1 914 421 4081 inb ju mo 000 900 0 zv 622 BZ LNG OG LGX i A 1 E xZ 10 252 VHOS jn JULY Sry NY TY 6 939 it E gif iH Zro xos 3mmos 7553 E LNOS3 NO O3LNNON Lr dv yzy 40 918 515 1331 ZVHOSL jn y 5 0 9t 211 n 62 c v 0 2 995 0061 jn 25 x ges sp 331N39 Te LNO24 NO O031NAO t t BONY UO P 31000 i 8 TI3NNYH2 v
10. dB from 3 to 3 reading Frequency Response 100 10k Hz Power Requirements Voltage 115 230 VAC input 50 60 Hz Current 8 120VAC 17A idle full power Consumption 48 VA Stray magnetic field 3 5 gauss maximum Operating Temperature Range O 50 degrees C 32 122 degrees F Dimensions 1 75 H x 19 W x 12 D 44 x 483 x 304 mm Weight 13 pounds 5 85 kg O dBv is referenced to 0 775 volts RMS Specifications subject to change without notice 01 89 Rev 1 0 Page 12 of 16 Operating Instructions Clear Com 1020 Amplified Monitor Speaker 6 0 Parts Lists 1020 M AMPLIFIER MODULE ASSEMBLY 710190 REV C CCPN DESCRIPTION REF DESIGNATORS RESISTORS 1 4W 3 9 OHMS R20 R13 R31 410005 1 4W 390 OHMS R24 R17 6 410010 1 4w 5 1K OHMS R51 410011 1 4 5 2 2K OHMS R60 410013 1 4W 5 4 7K OHMS R61 410016 1 4W 5 lOK OHMS R82 410017 1 4W 15K OHMS R86 410018 1 4W 5 22K OHMS R50 410019 1 4w 5 39K OHMS R87 410021 1 4W 47K OHMS 410022 1 4W 5 27K OHMS R66 410024 1 4W 100K OHMS R35 410025 1 4W 68K OHMS R8 410026 1 4 150 5 2 410030 1 4W 470K OHMS R52 410033 1 4W 330K OHMS 410035 1 4 1 8K OHMS R12 410063 1 8W 6 81K OHMS R80 410065 1 2W 22 OHMS 410073 2W 39 OHMS 410089 1 8W 10 5 R39 410105 1 89 47 5K OHMS R68 410111 1 8W 39 2K OHMS R41 410139 1 4W 1 OHM R27 410140 1 4W 12K OHMS R2 410141 1 4W 23 7K OHMS 410142 1 4W 47 OHMS 410144 1 4M 8 25K OHMS 410145 1 4W 90 9
11. ed by large level input signals Variations in Q2 s transfer charac teristics are accommodated by ad justing 25 the bias voltage con trol on 107 Pin 3 to hit the right spot on Q2 s curve as previously described in Section 3 1 Limiter Disable and Adjustment in Chapter 3 0 Troubleshooting D19 provides a fast attack time on large signals while R73 provides a linearization signal to the gate of Q2 reducing distortion when in limiting For measurement and troubleshooting purposes test point 3 when tied to TP4 through a 33k ohm resistor will defeat the limiter When the limiter is disabled bias adjust 01 89 Rev 1 0 Page 9 of 16 ment P5 should be turned fully counter clockwise to assure 1 2 V2 bias voltage on IC7 High Channel The first half of 1010 is buffer amp feeding the second half of IC10 which along with the associ ated precision components serves as a three pole high pass filter This high pass filter is flat throughout the audio range 3dB at 450842 and 10dB at 350Hz The out put of this filter is fed 2 a 7 watt integrated audio power amp Low Channel Icl Pin 5 is a summing for the outputs of the two amplifiers Signals from channels A and B are combined here through R7 and R8 If signals in both channels are identical a net gain of 6dB will be achieved at ICL Pin 5 junction limiter The first half of 101 is a buffer amp feeding the second half of
12. ian can test the 1020 using dummy loads instead of speakers these loads should be 8 ohms for the high channel and 4 ohms for the low channel Remove load from low speaker output J6 and J7 3 1 Limiter Disable amp Adjustment Disable Disable the limiter circuit before measuring stage gain To disable it temporarily install a 33k ohm resistor between test points 3 and 4 for channel A and test points 1 and 2 for channel B Adjust If replacing 01 or Q2 readjustment of the limiter set point is required To readjust refer to the schematic and use the following procedure 1 On either channel apply lOdBv at 18082 to the unbalanced input 2 With volume control to full volume read the level at the low speaker output J6 or J7 to ground Adjust P5 for channel A or P4 for channel B to obtain a 8 reading Apply test signal to remaining channel and repeat Steps 2 and 3 NOTE To enable the limiter remove the 33k ohm resistor 3 2 Amplifier Balance The DC balance between IC3 and IC4 is adjusted via Pl Use a DC voltmeter between J6 and J7 to adjust Pl to read 0 0 VDC 01 89 Rev 1 0 Page 7 of 16 Operating Instructions Clear Com 1020 Amplified Monitor Speaker AMPLIFIED MONITOR SPEAKER TEST SIGNAL CHART CONDITIONS Unbalanced Input at 910 or 2 Limiter disabled Test Points 1 and 2 3 and 4 connected with 33k ohm resistor P4 and P5 set fully counter clockwise Volume control set fully clockwise
13. k reading meters show the audio level present at the input connectors They span 23dB and their sensitivity is user adjusta ble Set at the factory for 0 the meters display O with a OdBv level at the balanced inputs The volume controls do not affect the meters Transformer Option Both the 1020 and 1020M are availa ble with optional input transfor mers on the balanced inputs Applications The 1020 Amplified Monitor Speaker is ideal for a wide variety of installations particularly where rack space is at a premiunm Moni tor applications include stereo 2 channel program audio video audio tape machines off air receivers patch bay signals wireless microphone receivers cue PFL audio console outputs Operating Instructions Clear Com 1020 Amplified Monitor Speaker 2 0 Installation 2 1 Overview The 1020 installs in a standard 19 inch equipment rack Minimum signal level needed to drive the monitor to full volume with volume controls set at full volume is a l5dBv 0 40V p p signal on the unbalanced input or a 4dBv signal on the balanced input 2 2 Input Connection to Rear Panel pm BALANCED BALANCED 115 230 Fu n syz DARTS INSIDE REFER SERVICING r Made 9 a a TO QUALIFIED PERSONNEL 230v 1 4A 110VA MAX SN Jn 50 51 BALANCED UNBALANCED I En 7 INE Clear Com CAUTION T 20 NOT REMOVE COVER Fuse GaN eU i
14. n of approximately 9 to 21 display driver ICl displays dB Bias supply voltage for IC3 is when a OdBv signal appears at provided by resistors R16 and R17 Pin 5 01 89 Rev 1 0 Page 10 of 16 M3XV3dS 3MOl1INON 01 owon 200 WvNOVIO 2018 N3 Od 431114 dH 431113 di S3LINWIT M3WHOJSNvaI 1YNOUdO JWMOA g TANNVHO 19459 NA A0 Z SLL 3 v 73NNVH2 AV 1dSIQ NA Page 11 of 16 01 89 Rev 1 0 Operating Instructions Clear Com 1020 Amplified Monitor Speaker 5 0 Specifications General Amplifier Design 2 channel 2 way bi amplified two high frequency amplifiers and one summed low frequency amplifier Input Impedance 8 lkHz 45k ohm unbalanced lOOk ohm balanced 20k ohm balanced w input transformer Minimum Level for Mar Output l5dBm unbalanced 40Vp p 4dBm balanced Max Level input overload l5dBm unbalanced 14 4Vp p tl8dBm balanced Input Connectors Balanced 3 pin female XLR Unbalanced RCA Amplifier Max Power Output High amp 7W 4 ohms Low amp l4W 4 ohms THD 0 5 before compression Residual Noise 65 dB Channel Separation 30 dB above 800 Hz Level Meters 1020M Option Multi segment LED bar type peak reading Display Range 20 to 3 dB Sensitivity adjustable from 20 to 8dBv unbalanced input and 9 to 19dBv balanced input Accuracy 0 2
15. om products We guarantee our continuing interest in your satisfaction with them 01 89 Rev 1 0 Page 2 of l6 Operating Instructions Clear Com 1020 Amplified Monitor Speaker 1 0 Introduction to the 1020 Amplified Monitor Speaker Clear Com Monitor Model 1020 Amplified Speaker is biamplified audio monitor in a rack mount closure that occupies a single l 3 4 rack space The self contained unit enables easy monitoring of a variety of audio sources It pro vides two separate channels with individual volume controls for a Stereo signal or two discrete mon aural signals The input for the balanced signal is a 3 pin XLR type electronically balanced and the unbalanced input is RCA type Both are line level inputs For a best possible low distortion signal the 1020 contains input limiters To achieve extended bass response all frequency signals under 200 Hz from both channels are summed and fed into a single bass amplifier which drives the baffled loudspeaker mounted in the center of the front panel The mid high frequency drivers are mounted at the extreme ends of the 1020 pro viding the maximum amount of stereo image separation possible Level Meters Model 1020M Clear Com s monitor speaker is also available with two LED bar type peak meter displays on the front optionally multi segment level 01 89 Rev 1 0 Page 3 of 16 panel to help monitor input levels Model 1020 M These pea
Download Pdf Manuals
Related Search