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Содержание PMC-450

Страница 1: ...LATION CONTROLLER I FOR AM BROADCAST I INSTALLATION AND OPERATION MANUAL I I I I I I I I I I I I el THE PROFESSIONAL S CHOl CE SYSTEMS Circuit Research Labs Inc 2522 West Geneva Drive Tempe Arizona 85282 3192 U S A 1800 535 7648 j602 438 0888 FAX 438 8227 ...

Страница 2: ...ematic drawings reproduced in this manual contain p r o p r i e t a r y d a t a t o C i r c u i t Re se a r c h Lab s I n c T he u se r o f t h i s manual agrees to make no disclosure reproductions or use of any pa r t o f t hes e d raw i n gs except by pr i or w r i t ten perm i s s i on f r om Circuit Research Labs Inc P N PMC 450 10082 CIRCUIT RESEARCH LABS INC 2522 W Ceneva Drive Tempe AZ 8528...

Страница 3: ...Line Connections Unbalanced Line Connections 2 18 INITIAL SET UP General Set Up Procedure Asymmetry Set Up Tilt Correct Set Up Auxi I iary Output Day Night Operation 2 31 GUIDELINES FOR SYSTEM SOUND SETTING 3 OPE RAT ING INSTRUCT IONS 3 1 GENERAL 3 3 FRONT PANEL CONTROLS SWITCHES INDICATORS Powe r L ED I nd i ca to r G R Input AGC Switch Mid Range Presence Hi Freq Equalization Input Level Indicato...

Страница 4: ...REMENT 6 7 6 24 TOTAL HARN tONIC DISTORTION 6 8 6 25 FREQUENCY RESPONSE 6 8 6 26 SIGNAL TO NOISE NOISE RATIO 6 8 6 27 INTERN tODULATION DISTORTION 6 8 6 28 TROUBLESHOOTING 9 General 6 9 Suggested Component Checks 6 9 6 34 CUSTa 11ZATION 6 11 6 43 FACTORY SERVICE 6 14 7 APPENDIX A B c D E F c SYSTEM INFORN ATION PARTS LISTS BLOCK DIAGRAM PC BOARD LAYOUT DIAGRAM SCHEN ATIC DIAGRAMS FRONT PANEL CONTR...

Страница 5: ...RATIONS BALANCED LINE CONNECTIONS UNBALANCED LINE CONNECTIONS NORMAL M DULATION ENVELOPE UNDER CORRECTED M DULATION ENVELOPE OYER CORRECTED M DULATION ENVELOPE TYPICAL TRANSMITTED SPECTRUM COv PARISON NRSC PRE EMPHASIS NRSC STOPBAND SPECIFICATION BASS PRE EMPHASIS FILTER RESPONSE OUTPUT SPECTRUM OF PMC 2 2 1 2 2 2 5 2 7 2 7 2 1 3 2 1 3 2 1 4 3 5 4 3 4 3 5 4 5 7 PMC 45O C Co py r i g ht Ci r c u i ...

Страница 6: ...t y for the cu s tomer s f ailure to comply with these requiremen t s 1 5 RE AD i ns tructio ns ALL INSTRUCTIONS Al I safety and operating should be read be f ore the equipment is operated 1 6 GROUND AND POJVER CONNECTIONS To minimize shock hazard this equipment must be connected to an electrica l ground Grounding is accomplished by proper use of the three conductor AC power cable supplied with th...

Страница 7: ...tion Selectable Low frequency Tilt Correction Circuit Improves the Modulation Capabi I ity of Many Plate modulated Transmitters 22 dB Range 10 Segment Input Peak Indicator Programmable 1 dB step Peak Limiting Control Rugged 1 3 4 Rack mount Chassis With Integral RFI Protection Adjustable High Frequency EQ Adjustable Mid Range Presence 1 16 The CRL PMC 4 50 i nco r po r a t e s de s i gns o r i g i...

Страница 8: ...vel by several percent 1 21 Progranmable 1 dB per step peak limiting circuitry i s provided with a range from Oto s dB This circuitr y s e I e ct s t he amount o f i n s tan tan e o us ga i n reduct i on I i mi t i n g applied to the audio signal 1 22 To aid the user in properly setting the audio into the unit a 10 segment peak reading LED input meter with a range from 20 to 2 dB is provided overl...

Страница 9: ...PoweredRadio Com FIGURE 1 1 TYPICAL TRANSMITTED SPECTRUM Laboratory transmitter 15 minute peak store display V 10 dB div H 10 kHz div 300 Hz resolution PMC 450 C Copyright Circuit Research Labs Inc 1989 Page 1 4 ...

Страница 10: ... OF NEGLIGENCE BREACH OF WARRANTY OR OTHERWISE THIS DISCLAIMER OF INCIDENTAL OR CONSEQUENTIAL DAMAGES It K LUDE S BUT IS NOT LIM ITED TO PROP ERTY DAMAGE S LOS S OF PROFITS LOSS OF TIME OR OTHER LOSSES OR INCONVENIENCE RESULTING FR 1 ANY DEFECT IN THE MATERIAL OR V ORKMANSHIP OF THIS PRODUCT OR ANY OTHER CONNECTION WITH THE PURCHASE OPERATION OR USE OF THIS PRODUCT S 1E STATES DO NOT ALLO V THE EX...

Страница 11: ...iver manufacturers and the trade press can be informed as to the progress of conversion to the voluntary national standard 1 34 If this card is missing notify Circuit Research Labs Inc or National Radio Systems Corrmittee c o NAB Science Technology 1771 N Street N W Washington D C 20077 6316 PMC 4 5O C Co p y r i g h t C i r c u i t Re se a r c h L a b s I n c 19 89 Page 1 6 ...

Страница 12: ...put output 5o Hz t o 8 kHz o 1 5 d B 3 dB at 9 5 kHz 30 dB atten at 10 5 kHz 4 0 d B a t t e n a t 1 1 0 kHz Conforms to NRSC standard using required dynamic measurement method 50 Hz to 10 kHz 0 1 5 dB 3 dB at 11 kHz 30 dB atten at 13 5 kHz 50 Hz to 15 kHz 0 5 dB 10 dBm input output 20 kHz bandwidth 0 25 over selected operating bandwidth at or below 100 negative modulation level o 1 65 dB in opera...

Страница 13: ... level meter with a 22 dB 28 dB with OVLD dynamic range 2 I I imi t i nd i ca to r s mo n i t o r a c t i v i t y of patented overshoot corrected filter circuitry 32 to 122 degrees F 0 to 50 degrees C 100 130 or 200 250 VAC 48 440 Hz 20 VA maximum EMI suppressed IEC connector standard 0 95 RH non condensing 0 1 5 00o feet AMS L 18 lbs including standard accessories 19 48 3 cm W 1 75 4 5 cm H 16 4 ...

Страница 14: ...OWER UP OF THIS UNIT Peak Modulation Controller s FIGURE 2 1 PMC 450 FRONT PANEL A 11 0U1 UI O a H U t J uoO H I I U I l I 0 2 1 1 ol3leleleleJeJeJeJeJeleJeJelelo 1111 1 o e C J 0 FIGURE 2 2 PMC 450 BACK PANEL 2 3 BEFORE POWER UP 0 1 Se t th e power I ine module as p e r Section 2 4 C 0 CRL SISHMS H r 11 JH 2 Set the internal jumpers as required for the intended s y s t em a pp I i c a t i on a s ...

Страница 15: ...ining the fuse and the PCB voltage selector by pushing in on the raised the power plug receptacle lever adjacent to Remove t he PCB v o I tag e s e I e c to r and po s i t i on i t the red I ine on the edge of the PCB corresponds opening in the cover opposite the legend f or the line voltage so that to the desired 3 I n s e r t t h e PCB v o I t a ge s e I e c t o r f i r m I y i n t o t h e mod u...

Страница 16: ... p r e s en t s an impedance of l0K ohms Jl0 OUT BASS CLIP JUMPER This jumper selects the low frequency response of the input leveling AGC c i r cu i try I n the OUT po s i t ion the I ow frequency response is flat In the IN posi tion the G R circuits do not respond to frequencies below 100 Hz The OUT position i s rec onme n ded for mos t a pp I i cat i on s Jll IN BASS PRE EMPHASIS JUMPER The IN ...

Страница 17: ...VDC Fixed measure at TP4 50 mVDC DS2 1 5 VDC Fi x ed measure at TPS 50 mVDC GATE LED INDICATOR This LED is illuminated when the gate circuitry is activated This f reezes all gain control action when the level drops below the gate threshold 20 dB LED DESCR I PT ION DS 3 Gate Indicator 2 11 INTERCONNECTIONS 2 12 GENERAL 2 13 Th e PMC 4 50 i s d e s i gn ed t o i n t e r f a c e w i t h ma n y t y p ...

Страница 18: ...L f AGC400 STUDJO AUDIO AGC CAL STL SEC400 4 BAND R ECEIVER COMPRESSOR OPTIONAL Al USE WITH MONAURAL STL EQUALIZE TELCO LINE CAL CAL SEC400 __ PMC450 4 BAND AM COMPRESSOR LIMITER lll TIONAL Bl USE WITH TELEPHONE LINE CAL AGC400 AGC CAL SEC400 4 BAND COMPRESSOR OPTIONAL CAL PMC450 AM LIMITER Cl CO LOCATED STUDIO TRANSMITTER SITE __ CAL PMC450 AM LIMITER MAIN TRANS MAIN TRANS MAIN TRANS ...

Страница 19: ...f or operation with unbalanced line equipment The PMC 450 has one i n put and one ma i n output connect i on An aux i I i a r y output connection is also provided for driving a second transmitter NOT E Wh e n u s i n g t he u n b a I a n c e d I NPUT c o n n e c t i o n o n I y t he shield is connected to the ground terminal and the negative terminal is connected to the ground by a jumper w i re a...

Страница 20: ...R AUX TRANSMITTER FIGURE 2 5 BALANCED LINE CONNECTIONS INPUT OUTPUT GND GND 41 J _ INPUT OUTPUT AUX OUT GND I _ _ _ OUTPUT TO NIGHT OR AUX TRANSMITTER DO NOT CONNECT FIGURE 2 6 UNBALANCED LINE CONNECTIONS PMC 4 50 C Co p y r i g h t C i r c u i t Re s e a r c h L a b s I n c 19 8 9 Pa ge 2 7 ...

Страница 21: ... on 2 11 3 Ve r i f y t ha t t he i n t e r n a I j ump e r s a r e s e t p r o p e r I y a s p e r Section 2 6 2 21 SET UP PROCEDURE 2 22 IN I TIAL CONTROL SE T TINGS CONTROL OR SWITCH INPUT AGC G R MID RANGE PRES E NCE SET T ING HIGH FR EQUENCY EQUALIZATION TILT CORRECT LIMIT I NG OUTPUT LEVEL ASYIY METRY INPUT CALIBRATE BANONI DTH PROOF OPERATE 9 S Out OP ERATE Located on back panel 8 FULL Y cc...

Страница 22: ...he input sensitivity may ne e d to be adj u sted see Section 6 4 3 I n c r ea se t he s e t t i n g o f t he OUTPUT LBVBL con t r o I f r on t p an e I c I o ckw i se u n t i I t he neg at i v e mod u I a t i on peak s a s obs e r v e d on the mod u I at i on mo n i tor or o s c i I I o scope are peaking at 90 9 5 The setting of this control is d i ct ated by the neg at i v e mod u I at i on cap a...

Страница 23: ...k modulation to be set accurately 3 4 I f t he as ymme t r y cont r o I i n c re as es neg at i v e mod u I at i on check for phase reversal of PMC outp u t connections Re t u r n t he GIR and LIMITI NG sw i t ch es to t he no r ma I I y used positions 2 25 TILT CORRECT SET UP NOTE NOTE This procedure should be done only after all other adjustments have been completed This adjustment can be p er f...

Страница 24: ...oscope or mod u I at Ion mo n i tor Th e d i sp I a y w i I I be hi g h I y clipped as shown in the fig ure s on the fol lowing pa ge TO AVOID DAMAGE THE TRANSMITTER SHOULD BE OPERATED FOR A FEW SECONDS AT A TIME ONLY WARNING NOTE I f t he mod u I a t i o n en v e I ope as viewed on the 7 8 osci I loscope appears as in correction is necess a ry and Figure 2 7 t he f o I I ow i n g no ti It procedu...

Страница 25: ...70 as obser ved on t he mod u I a t i on mo n i to r o r o s c i I I o s cope 4 Increase the PMC INPUT LBVBL contro l such that the OVLD indicato r flashes to a point where it is illumi nate d most of the t i me w i th p r o g ram au d i o p resen t I n c re as e the settings of the PMC G R and LIMITING switches to maximum s et t i n g s 8 and 5 r esp e c t i v e I y D emodu I a t ed au d i o wi l...

Страница 26: ...dio Com I I I I I I I I I I I I I I I I I I FIGURE 2 7 NORMAL MODULATION ENVELOPE No Tilt Present FIGURE 2 8 UNDER CORRECTED MODULATION ENVELOPE Tilt Present I PMC 450 C Copyright Circuit Research Labs Inc 1989 Page 2 13 ...

Страница 27: ...e to ve ri fy that the majo ri ty of f re q u ency t i I t i s removed u BE CAREFUL NOT TO OVER CORRECT AS SHOWN IN WARNING FIGURE 2 9 DAMAGE TO THE TRANSMITTER MAY u RESULT IF TILT IS LEFT SICNIFICANTLY 8 9 OVER CORRECTED If th i s adjustment cannot be successfully waveform i n i t i a I I y t i I t s i n the manner as 2 1 1 the t ran sm i s s i on s ys t em r eq u i res see METHOD 1 Step 110 mad...

Страница 28: ...tput level of the PMC 400A should never be set such that the negative modulation capablllty of the transmitter Is exceeded NOTE The asymTietry has been previously set for the ma in transmitter in Section 2 24 Verify that the auxiliary transmitter is capable of the positive peak modulation previously set for the main transmitter I f the positive peak capability is significantly less t ha n t he ma ...

Страница 29: ...unction with any of the above control settings the dynafex noise reduction circuitry can be activated The f r o n t p an e I TBIUJSBOLD con t r o I s hou I d be s e t t o ob t a i n t he ma x imum amount o f noise reduction during program pauses w i t hou t aud i b I e exp ans i on a r t i f a c t s I t may be des i r ab I e to ch an ge the po s i t i on s of i n tern a I jumper s J11 and J 19 to ...

Страница 30: ... 6 M BOTH 6 M C 2 1 0 f t 3 6 s WIDE 6 s L 2 1 I Beauti ful Music Hea vy 9 M DUAL 9 M C 6 2 I Medi um 6 s BOTH 6 s C 4 1 SO f t 3 s WIDE 3 s C 2 0 Country I Heavy 9 F DUAL 9 M C 6 3 Medi um 6 M BOTH 6 M C 4 2 0 f t 3 s WIDE 3 s C 2 1 I Talk Heavy 1 2 M DUAL 1 2 M L 6 4 Medi um 9 M BOTH 9 M L 4 3 I so r t 6 s BOTH 6 s L 4 2 Classical I Hea vy 9 s BOTH 9 s C 4 2 Medi um 6 s BOTH 6 s C 2 1 SO f t 3 s...

Страница 31: ...much as 4 dB below the calibrated input level If the input level drops 6 dB the output wi 11 drop only 2 dB Input s i gna I s may i n c re as e as much as 1 5 dB above the 0 dB i n d i ca t i on on t he LED i nput I eve I mete r and not be a f f ect e d by the set t i n g of t h i s sw i t ch s i n c e C R ac t i on i s au t oma t i c above o Proper setting o f this switch is determined by t he so...

Страница 32: ...on due to transmitter or antenna de f iciencies the B1 PABQ BQUALIZATION control should be rotated counter clockwise towards the OPP po sition an d u s e d t o t r oub I e shoo t t he s y s t em I f t h i s i s necessary the user s hould determine the rea son f o r no t be i n g ab I e t o u s e t he NltSC s e t t i n g so t ha t t he p r ob I em ca n be co r r e c t e d Ce n e r a I I y t he i na...

Страница 33: ...ou s gain reduction limiting applied to the audi o s ignal Lower settings 0 1 or 2 will p rovide well cont r o I I e d but I es s dense pro g ram au d i o Hi gher sett i n gs 3 4 or 5 wi I I p rod u c e ver y dense and I o u de r bu t st i I I tight l y controlled audio The setting o f this sw itch is e n t i r e I y up t o t h e u s e r dep end i n g o n t he d e s i r ed o n a i r apparent loudn...

Страница 34: ... i s a d up I i ca t e o f t he O d8 i nd i ca to r s e gmen t on t he f r on t pane I le vel meter 3 30 BANONIDTH SELECT SWITCH 3 31 This switch selects the cutoff frequency of the internal low pass filter In the STD out position a 9 5 kHz f ilter characteristic is enabled corresponding to the NRSC s t o p b a nd sp e c i f i c a t i o n I n t he kHz p o s i t i o n i n t he PMC do e s no t c on ...

Страница 35: ... I I y o n t he PCB see Sec t i on 2 6 Th i s f unc t i on i s not no r ma I I y r eq u i r ed with transmitters that do not have a plate modulation transformer The PMC will work without using the tilt correction circuitry however higher peak modulation capability will likely result when the circuitry is enabled and correctly adjusted as required see Section 2 25 3 36 AUXILIARY OUTPUT LEVEL CONTRO...

Страница 36: ...i s t i c s o f AM b r o ad c a s t s A ma t c h i n g o f p r e emp ha s i s and de emp has i s i s exp e c t ed to imp rove t he consume r s overall satisf action with the technical qualit y of li s tening t o AM radio 4 5 Most AM stations have used p r e emphasis to varying extents This pre emphasis is employed in an attempt to compensate for the n a r row response of most Al A rec e i v er s I...

Страница 37: ...incentive for the further building of AM wideband receivers 4 10 The specification of the chosen stopband characteristic is shown graphically in Figure 4 2 It is implemented through the use o f app r op r i a t e and ca r e f u I I y des i gn ed au d i o I ow pas s f i I t e r s as the final filtering prior to modulation Compliance is measured dynamically to take all audio processing functions int...

Страница 38: ...USE AC ALSO 5 5 Power trans f ormer Tl is a triple output with a center tapped winding for the 15 volt supply This winding on Tl provides the operating voltages for the ful I wave bridg e recti f ier consisting of CR3 CR4 CRS and CR6 The p u I s a t i n g DC v o I t a ge i s f i I t e r e d b y C 10 an d C 11 The DC v o I t a ge f r om t he r e c t i f i e r i s f ed to v o I t a ge r e gu I a to ...

Страница 39: ...r ee o u t p u t s a r e p r o v i d ed f r om U5 Th e signal may be monitored at US pin 1 pin 7 A The output of US pin 1 is applied to the le f t ch an n e I meter amp I i f i er U4 p i n 2 V4 i s a rec t i f i er that prov i des a DC s i gna I for D i sp I a y Dr i v er U 1 I o ca t e d on PCB 80575 Thi s pulsating DC signal may be monitored at the cathod e of CR13 B T he se c o nd ou t p u t f ...

Страница 40: ... the release time of the AGC circuit The other half of Ull is not u sed It it terminated to prevent it from causing noise 5 16 See schematic page 1 and FRONT PANEL CONTROL BOARD schematic The display board is used to acquire the GATING s i gn a I Wh en e v e r p i n 1 o f U 1 goe s t o a h i gh s t a t e t he 2 0 signal i s output to Q6 though J1 14 and resistor R19 When Ul pin 1 i s in a low stat...

Страница 41: ... I y c I ockwi se up to 2 dB more pre emphasis at lOkHz is added as measured at pin 1 of U1 2 t ha n t he NRSC p r e emp has i s de ten t po s i t i on 5 20 TRI BAND LIMITER 5 21 The crossover fr equencie s for the tri band l i miter are lkHz and 4kHz 5 22 Refer to schematic page 3 The output of U20 pin 1 is applied to a diode peak limiting circuit composed of CR23 CR22 C90 C91 and R163 Its functi...

Страница 42: ...t er sect I on con s i s t s o f component s U 18 Q2 2 Q 2 3 Q24 R157 C8 5 and C86 U18 f unctions as a VCR Voltage Controlled Resistor Wh e n t he p ea k v o I t a g e a p p I i e d t o Q2 2 o r Q24 i s g r ea t e r t ha n 6 vo l ts the transistors will begin to conduct 5 27 Both the po sitive and negative peaks are limited The resulting current charges C85 through resi s tor R157 Control c u r r ...

Страница 43: ... Th e output o f L7 is terminated by R135 and is also connected to a shelving f ilte r composed of R278 R277 and C188 This filter i s the f inal component used to implement the NRSC pre empha s i s It also minimize s high f requency overshoots in the transmitter 5 33 Overshoot correction fo r thi s f ilter is prov ided b y t r a ns istors Qll Q12 Q18 and Q19 5 34 The clipping threshold for Q19 is ...

Страница 44: ...n e c es s i tat e mo n i tor i n g t he amp I i t u de and p has e o f a s yrrme t r i ca I peak s The r e f o r e po I a r I t y switching t echniques that generate noise are not required 5 39 If there is question as to the presence of asyrrmetry on the modulated RF carrier refe r to th e Troubleshoot ing section of the manual for fur th e r assistance 5 4 0 The o ut put of the f ilte r i s appl...

Страница 45: ...i n 5 h a s s i g n a I i mp r e s s ed on i t f r om t he PROOP OPBRATB switc h U t 3 p in 7 i s u sed as the buffer for the other hal f of U 13 whi ch serves as the t ilt correction amplifier The output o f U13 pi n 1 is applied to the MONO OUTPUT control R3 31 T he output of the control drives the d i f f e re n t i a I o u t p u t amp I i f i e r U 14 10 0 ohm r es i s to r s R 10 6 and R108 a...

Страница 46: ...ators are secure and in good working condition 3 Remove any d i r t or dust around the uni t This may not irmiediately affect the Unit I but long term exposure may 4 Ke e p a I I I i q u i ds away r rom t he un i t Ac c i den t a I s p i I Iage ca n re s u I t i n s e r i ou s dama ge t o t he un i t and w i I I vo i d the warranty 6 3 ALIGNMENT PROCEDURES 6 4 EQUIPMENT REQUIRED AG Sl AUDIO GENERA...

Страница 47: ...ear OPERATE down M NO TILT CORRECT rear FULL CON M NO OUTPUT rear FULL CCW 6 10 INTERNAL CONTROL SETTINGS NOTE Do not change the factory setting unless there is factual informatlon indlcating circuit maIfunction Please contact CRL for further assistance R62 R146 R30 5 mi d ra nge 6 11 POWER SUPPLY CHECK 220 VAC CHECK Set Power Mod u Ie vo I tag e se Ie ct or to 220 VAC po s i t i on Me a s u r e v...

Страница 48: ...Check PMC 4 50 f ront display OVERLOAD LED o ff AG 51 to 10 dB ATTE N Move J9 to BRIDGE DM 11 reading 9 25 to 9 75 dB Move J9 to TERM Connect Di YM probe to TP 7 DM 11 reading 6 5 to 7 0 dB 6 13 CATE CIRCUIT TEST AG 51 to 31 dB ATTE N Check PMC 4 50 GATE LED on Ie r t r ea r sec t i on o f PCB AC 51 to 30 dB ATTE N Check PMC 45 0 GATE LED o ff 6 14 C R TEST PMC 450 G R switch s et to o Di YM set t...

Страница 49: ... rear side o f R67 Dtvt A reading 12 25 to 12 75 dB Mo ve J 11 t o IN DM I reading 9 25 to 9 75 dB Mo ve J11 to OUT 6 16 LIMITING TEST AG 51 to 400 Hz PMC 450 Dtvt A reading l IM IT INC rear side R67 1 o 75 to 11 25 2 9 25 to 9 75 3 7 75 to 8 25 4 6 4 5 to 6 9 5 s 4 50 to 5 25 PMC 450 LIMITI NG switch to o dB dB dB dB dB 6 17 NRSC PRE EMPHASIS CALIBRATION AND TEST Check D YM probe on rear side of ...

Страница 50: ...1 dB approx Dtvfv probe to I e ft side of R158 D reading 17 0 to 1 8 0 dB AG Sl to 4 5 KHz D N 1 reading 13 0 to 14 0 dB DMYI probe to r i g ht s id e 0 f R129 DMYI reading 5 1 dB approx D N 1 probe to TP 9 D A v reading 2 5 to 3 5 dB 6 18 MID RANGE PRESENCE CALIBRATION Check D N 1 probe to TP 9 Check DMYI set to AC DECIBELS AG Sl to 200 Hz Dtvfv R ELAT I V E sw i t c h I N PMC 450 MID RANGE PRESE...

Страница 51: ... e o f R 1 39 DM v I r ea d i n g 1 3 7 t o 1 4 5 VDC r ememb e r r ea d i n g DMv probe to le ft side o r R140 Adjust R146 ror same NEGATIVE voltage as front side o r R 13 9 within 01 vo lt s PMC 4 50 L IMIT I NG sw i t c h t o 5 AC Sl to 1 KHz Check PMC 450 f or both LIMITING LEDs on AC 51 to 100 Hz 0 dB ATTEN PMC 45 0 G R SW i t Ch to 8 Oscilloscope probe to I e r t s Ide 0 f R196 Adjust PMC 45...

Страница 52: ...neg at i v e peaks PMC 450 iYONO TILT CORRECT rear f ul I CON Move J 17 to OUT PMC 450 YONO OUTPUT control rear tu 11 CON 6 23 PREPARATION FOR SPECIFICATION MEASUREMENT PMC450 co ntr ol settings G R switch o LIMITING switch o MID RANGE PRESENCE control O HI FREQ EQUALIZATION control OFF TILT CORRECT control OFF ASYt AY ETRY control fu l I CON PROOF OPERATE switch rear OPERATE down BANDNIDTH rear t...

Страница 53: ...FREQUENCY RESPONSE 400 Hz REFERENCE LEVEL PMC 450 G R switch to o AG 51 to 20 dB ATTEN 6 26 SIGNAL TO NOISE NOISE RATIO 400 Hz REFERENCE LEVEL PMC 4 50 C R sw i t c h t o 0 OPERATE tv ODE MIN 6 5 dB PR00F N ODE M I N 7 5 d B 6 27 INTERMODULATION DISTORTION PMC 450 AC 51 to IM SIC 1 0 dB ATTEN AA 51 to liYD 3 RANGE C Copyright Circuit Research Lab s I nc 1989 Page 6 8 ...

Страница 54: ...fraid to li sten to the unit whi le it is in operation A pair of good quality 600 ohm or higher impedance headphones can be used to bridge across the input and output Listening ca n quickly locate a bad unit or clear a suspected unit 6 31 SUGGESTED CO v PONENT CHECKS 6 32 This section lists typical f ailure condit ions f o I I owed by component s and other fa ctor s that could caus e t hat f a I I...

Страница 55: ... is play No asynmetry control No positive peak s above 100 Asyrnnetry control not f ully counter clockwise Replace U14 or U13 De fe ctive PROOF OPERATE switch Check 1 0 connections Replace U11 U9 module EQ pot bad Check HI FREQ EQUALIZATION control Replace U12 Bad HI FREQ EQUALIZATION control Replace U6 Replace Ul U2 on displa y PCB Bad asyrnnetry pot Ve r i f y s ymp t om w i t h osci I loscope a...

Страница 56: ...sistor was chosen WARNING Do not use solder wick or any other type of utility that sinks large amounts of heat away from the Iron Doing so may damage the solder pad and circuit foll THE WARRANTY WILL BE VOID Use a solder sucker such as a PALADIN 6 40 PROCE DUR E 1 Remove t he e i g ht Ph i I I i p s screws f r om the top o f the PMC 4 50 Remo v e t he I i d a nd se t i t a s l de 2 On the ma i n P...

Страница 57: ...POLE at the specified resistor l ocation to either for this 11 Solder the two attached resistors to the other solder pad a s s o c I a t e d wi t h t h i s mod i f i ca t i o n 12 Power up the PMC 450 13 Send program audio containing voice material into the PMC 45 0 and I isten to the outputs with headphones or a monitor system while switching the two chosen re sistors back and forth Use var 1ous ...

Страница 58: ...e voices wi I I remain l o u d but will still co ntain a bit o f audib l e IM distortion With val u es o f lOOK to lSOK the IM distort i on wi I I be reduced more Values above 1 50 K w i I I a f f ect the I o u d n es s o I the v o i c es more d rasti ca l ly PMC 4 50 C Copyright Circuit Research Labs I nc 1989 Page 6 13 ...

Страница 59: ...d with the ret u rned unit 1 T he ret ur n authorization numb er CLEARLY MARKED ON THE OUTSIDE o f the shipping container See example below 2 Desc r iption of trouble which includes a The symptom description b The un i t swit ch settings when the trouble was detected c A short descripti o n of the facility in which the u nit is used 3 App r ox i mate date o f p u r ch a s e and the s er i a I n um...

Страница 60: ...the con sol e and the phone l ine s or aura l STL with the other units at the transmitter s ite The O dB input i ndicator segment shou l d flash on peaks and the red OVLD LED should not flash wit h norma l prog r am ma ter I a I SEC 400 G R L IM I T COv PRESS CATE 6 Compre ss 20 OPERATI0 1 WIDE MJL T I BAND CCl JTROLS M Mu l t i 12 00 Th is uni t 1s ge nera ll y rece i vers at the transmitter peak...

Страница 61: ...M VAR W N Reverse Log Taper Right Turn Tr inme r Variable Wire Wound SEMICQ DUCTORS and INTEGRATED CIRCU ITS DIG DIP GE IC LIN ACC ADJ AL ALLM ASSY AX BKT BLK CQ ID Dig Ita l Dua l ln l ine Package Germanium Integrated Circuit Linear Accessories AdJUSt AIum i num A I umi num Assemb ly Axia l Lead Bracket Black Conductors EXT Externa l EXTR Extruded FEM Fema I e IN Inch IND Inductor INSUL Insulator...

Страница 62: ... 11945 11945 11930 11930 11945 11967 11930 11967 11945 11945 12253 12110 12249 12110 DES C61 C 2 C63 C64 65 C66 C67 68 C69 C70 C71 C72 73 C74 C75 C76 C77 C78 C81 C82 C83 C84 C85 C86 C8 7 C88 89 C90 91 C98 C99 Cl00 C104 105 106 C107 C117 C123 C124 125 Cl 26 127 C128 C144 145 C146 147 C148 C149 Cl 83 DESCR IPTIOO CAP PE 1 UF CAP Ov 1 UF 10 CAP PP 0047 UF 125 CAP PP 0047 UF 125 CAP Ov 1 UF 10 CAP Ov ...

Страница 63: ...OOE SI lA 50V 1N4001 12800 Q9 XSTR Sl S IC NPN 2N4123 15970 CRl0 DIOOE SI lA sov1 1N4001 12800 Ql0 XSTR S s C PNP MPS404A 15990 CR 11 DIOOE SI 1A SOY 1N4001 12800 Q 11 XSTR S s C NPN 2N4123 15970 I CR12 WI RE JLMP ER 4 IN 16460 Ql 2 XSTR S Is C NPN 2N4123 159 70 CR14 DIOOE SI 100 M 100Y 1N914B 12790 Ql 3 XSTR S s C NPN 2N4123 15970 CRl S DIOOE SI l0ON A 100V 1N91 4 B 12790 Q14 XSTR S s G NPN 2N412...

Страница 64: ...0 14290 14410 14040 14150 14690 14040 15160 14660 15080 14850 14900 14630 16470 16470 16510 14040 14 690 14690 14820 DES R83 R86 R87 R88 R89 R93 R96 R99 Rl00 R101 R103 R104 R105 R106 R107 R108 R109 R11 0 R111 R112 R113 R114 R11 5 R116 R117 R118 R119 R120 R 121 R122 R123 R124 R125 R126 R127 R128 R129 R130 R131 R132 R135 R136 R137 R138 R139 R140 R141 R142 R143 DESCRIPTIO WI RE JLMP ER 5 IN RES 15 0 ...

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Страница 66: ...CK ET DI P 8 PIN SOCKET DIP 24 PI N SOCK ET DIP 8 PIN SOCKET DI P 16 PIN SOCKET DIP 8 P11 p N 13590 13590 13590 14015 14015 1401 5 14015 16470 16450 16470 16470 16470 16470 16470 16470 12660 12660 12660 12660 12660 12660 13410 13410 13410 13410 13410 13410 13410 13410 13410 13410 12557 12557 12557 13162 1316 2 13160 15380 15380 15380 15380 15370 15380 15350 15380 QTY XUl 3 XU14 XU15 XUl 6 XUl 7 XU...

Страница 67: ...SORIES PONER CORD v ANUAL UNIT CABLE STRAP 4 SCREW RACK lvO J T INC 4 WASHER RACK l v OUNTING OPTIQ IAL ACCESSORIES RACK SLIDE ASSEMBLY P N 80197 12325 12852 12854 16645 15916 15917 15919 15918 13324 13140 13200 16250 13 13 1 12625 12647 12648 13328 13203 13244 13322 15580 1544 1 13250 13060 80282 13042 13725 133 28 15331 15242 15241 13045 10022 10020 80504 1643 5 10082 17590 13290 13460 12318 QTY...

Страница 68: ...SYSTEM SPARE PARTS KIT FM lC Lt ilT SPARE PARTS KIT SECB00 10203 SYSTEM SPARE PARTS KIT FM 2C Lt 11 T SPARE PARTS KIT SCB00A 10207 SYSTEM SPARE PARTS KIT FM 3 Lt 11 T SPARE PARTS KIT SCCB00 10201 SYSTEM SPARE PARTS KIT FM 4G Lt 11 T SPARE PARTS KIT SMPBS0 10206 SYSTEM SPARE PARTS KIT SCA 2 Lt 11 T SPARE PARTS KIT SMP900A 10205 3 IT SECURITY COVER RACK SL IDE KIT 1 PAIR SLR 4 IT SECURITY COVER PR E...

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