Gemini-PMX80-mix-sm维修电路原理图.pdf

Page 1SERVICE MANUALPMX-80Stereo Preamp MixerCONTENTS:Connections & Operations:.Page 2-4Specifications:.Page 5Parts Lists:.Page 6-8PCBs:.Page 7-9Schematics:.Page 10Gemini Sound Products Corp.120 Clover Place P.O. Box 6928Edison, NJ 08818-6928732-738-9003 (Phone) 732-738-9006 (Fax)RadioFans.CN 收音机爱 好者资料库Page 27611223344558109RadioFans.CN 收音机爱 好者资料库Page 31911122029303323241634252827132122141531322617353618Page 4Connections1. Make sure that the POWER (6) switch is in the OFF position. This unitcomes supplied with a 15 volt AC adaptor. Plug the male pin of theadaptor into the rear panel POWER JACK (7). Then plug the adaptorinto a proper power source.2. The MASTER OUTPUT (1) jacks are unbalanced and used to connectto your main amplifier.3. The DJ MIC (18) input (found on the front panel) accepts a 1/4connector and balanced and unbalanced microphones.4. On the rear panel are 2 stereo PHONO/LINE (3, 4) inputs, 1 stereoPHONO (5) input and 1 stereo LINE (2) input. The PHONO/LINESWITCHES (8, 10) enable you to set the (3, 4) inputs to Phono or Line.The phono inputs will accept only turntables with a magnetic cartridge.A GROUND SCREW (9) for you to ground your turntables is located onthe rear panel. The stereo line inputs will accept any line level inputsuch as a CD player, a cassette player, etc.5. Headphones can be plugged into the front panel mounted PHONES(36) jack.Operation1. POWER ON: Once you have made all the equipment connections toyour mixer, press the POWER (6) switch. The power will turn on andthe POWER LED (23) will glow RED.2. CHANNEL 1: The GAIN (11), HIGH (12), MID (13), and LOW (14)controls allow you to fully adjust the selected source. Switch # (15)allows you to select either the PHONO 1 (5) or the PHONO 2/LINE 1(4) input. The CHANNEL SLIDE (16) controls the output level of thischannel.3. CHANNEL 2: The GAIN (29), HIGH (30), MID (31), and LOW (32)controls allow you to fully adjust the selected source. Switch # (33)allows you to select either the PHONO 3/LINE 2 (3) or the LINE 3 (2)input. The CHANNEL SLIDE (34) controls the output level of thischannel.4. KILLING LOW FREQUENCIES: You can use the Kill Feature on eachchannel to remove Low band frequencies to create special effectsand improve your mix. Move the KILL SWITCH (17) down to removethe low band of Channel 1 from your mix. Move the KILL SWITCH(35) down to remove the low band of Channel 2 from your mix.5. CROSSFADER SECTION: The CROSSFADER (27) allows the mixing ofone source into another. The left side of the CROSSFADER (27) isCHANNEL 1 and the right side is CHANNEL 2. The CROSSFADER (27)in your unit is removable and if the need arises can be easily replaced.Crossfader units are available in three varieties. Part # RF-45 (whichis identical to the crossfader supplied with the mixer) has a 45 mmtravel from side to side. Part # RF-30 is available with a 30 mm traveldistance. Also available is the PSF-45 with a special curve designedfor scratch mixing. Just purchase one of these crossfader units fromyour Gemini dealer and follow these instructions:1. Unscrew the outside FADER PLATE SCREWS (B). Do nottouch the INSIDE SCREWS (C).2. Carefully lift the fader and unplug the CABLE (D).3. Plug the new fader into the cable and place it back in themixer.4. Screw the fader to the mixer.The CROSSFADER CURVE SWITCH (28) allows you to adjust the kindof curve the crossfader has. When the switch is in the left position,the curve is gradual and gentle. When the switch is in the rightposition, the curve is steep and cutting (perfect for scratching). TheCROSSFADER REVERSE SWITCH (26) allows you to reverse thecrossfader so that CHANNEL 2 is controlled by the left side of thecrossfader and CHANNEL 1 is controlled by the right side of thecrossfader.NONONONONOTETETETETE: When the CRCRCRCRCROSSFOSSFOSSFOSSFOSSFADER REVERSE SWITADER REVERSE SWITADER REVERSE SWITADER REVERSE SWITADER REVERSE SWITCHCHCHCHCH(26) (26) (26) (26) (26) is activated (moved to the right), only the crossfaderreverses. The Channel Slides, Gain, Kill Switches and tonalcontrols do not reverse.6. OUTPUT CONTROL SECTION: The level of the MASTER OUTPUT (1) iscontrolled by the MASTER (21) control.7. TALKOVER SECTION: The purpose of the talkover section is to allowthe program playing to be muted so that the mic can be heard abovethe music. The MIC/TALKOVER (19) switch has three settings. Whenthe MIC/TALKOVER (19) switch is in the left position, the mic andtalkover are both off. When the MIC/TALKOVER (19) switch is in thecenter position the mic is on, the MIC INDICATOR will glow, buttalkover is off. When the MIC/TALKOVER (19) switch is in the rightposition, the mic and talkover will be on and the volume of all sourcesexcept the Mic input are lowered by 16 dB. MIC LEVEL (20) controlsthe level of the MIC.8. CUE SECTION: By connecting a set of headphones to the PHONES(36) jack, you can monitor either channel or both together. Move theCUE SWITCH (25) to the left to monitor CHANNEL 1. Move the CUESWITCH (25) to the right to monitor CHANNEL 2. Move the CUESWITCH (25) to the center position to split the signals from eachchannel so that CHANNEL 1 will be heard in one earphone andCHANNEL 2 will be heard in the other earphone. Use the CUE LEVEL(22) control to adjust the headphone volume without effecting theoverall mix.9. DISPLAY: The DISPLAY (24) indicates the MASTER output.SpecificationsINPUTS:DJ Mic.1.5mV 600 OhmPhono.3mV 47KohmLine.150 mV 27KohmOUTPUTS:Amp.0 dB 1V 400ohm Max.20V Peak to PeakGENERAL:Low (Channels 1 - 2).+ 12dB/-32 dBMid (Channels 1 - 2).+ 12dB/-32 dBHigh (Channels 1 - 2).+ 12dB/-32 dBGain (Channels 1 - 2).0 to -20dBFrequency Response.20Hz - 20KHz +/- 2dBDistortion.0.02%S/N Ratio.better than 80dBTalkover Attenuation.-16dBHeadphone Impedance.16ohmPower Source.115V/15V AC 7.5W230V/15V AC 7.5WDimensions.6.5” x 14” x 3” (165 x 355 x 85 mm)Weight.5 lbs (2.27 kg)Page 5DescriptionPart #Cabinet Parts and Packing1234567891011121314151617181920212223242526Item #Parts Lists002-223034-020032-027021-776022-367023-674002-531002-704003-110148-236148-239148-238003-970003-969049-206159-171159-216146-710049-190121-003A111-043A111-046A111-049A111-051A110-172A102-025PANEL CONTROLPANEL REARBOTTOM COVERBRACKET VR (SUB CHASSIS)HOLDER FADERKNOB SWING (LONG)KNOB PUSH (SMALL)KNOB SLIDE (BIG)KNOB ROTARY (B TYPE)INLAY KNOB (BLACK)INLAY KNOB (GRAY)INLAY KNOB (RED)TRIM VRHOLDER LED (3f 17mm)PAD FOOTDUST PROOF CLOTE-VRSWING DUST PROOF CLOTHGND SCREWBUSHING WIREBAND-HEAD TAPPING SCREW/TW-E 36(AB)FLAT-HEAD TAPPING SCREW 3f6(AB)BAND-HEAD TAPPING SCREW 36(AB)FLAT-HEAD TAPPING SCREW 3f12(AB)BAND-HEAD TAPPING SCREW 3f5(AB)BAND-HEAD TAPPING SCREW (TWIN) 3f8 (AB)PAN-HEAD MACHINE SCREW 2.6f4(B)262-073262-074262-075PRINTED CIRCUIT BOARD PMX80-1PRINTED CIRCUIT BOARD PMX80-2PRINTED CIRCUIT BOARD PMX80-3DescriptionPart #Printed Circuit BoardsItem #123Page 6079-027079-012081-038092-135161-105161-106RECTIFIER DIODE 1N4002 (1N4003,1N4004)ZENER DIODE 1/2W 12VSLIDE SWITCHDC JACK 2.54P RCA JACK6P RCA JACKD3, D4D1, D2SW3J4J1J2DesignatorsDescriptionPart #Electrical PartsItem #123456074-145074-114074-107INTEGRATED CIRCUIT NJM2068LDINTEGRATED CIRCUIT NJM7912FAINTEGRATED CIRCUIT NJM7812FAIC1, IC2, IC3IC5IC4DesignatorsDescriptionPart #ICsItem #123080-104081-038082-019071-161071-066071-158LIGHT EMITTING DIODE (GREEN) 3.15fSLIDE SWITCHLEVER SWITCH 4P2CROTARY VR 16f L=20 GAIN 10KA2ROTARY VR 16f L=20 MIC 50KAROTARY VR 16f L=20 MASTER, 500KA2D9-12SW4SW2, SW5, SW7VR3, VR9VR8VR6DesignatorsDescriptionPart #Electrical PartsItem #123456074-145074-100074-104074-154INTEGRATED CIRCUIT NJM2068LDINTEGRATED CIRCUIT NJM4556ADINTEGRATED CIRCUIT NJM4558LDINTEGRATED CIRCUIT OR LB1423NIC4IC10IC1-2, IC6, IC8, IC9IC3, IC7DesignatorsDescriptionPart #ICsItem #1234Parts Lists - PCB1 Input OutputParts Lists - PCB2 MainMAIN PCBSW2ASW2BSW2CSW2DC110/16C610/16VR3A10KAx2R10100K23148IC2A4558LDVR3B10KAx2R12KR331K5R181K5VR2A50KEx2VR2B50KEx2VR1A50KEx2C25154C11562C27154C1510323148IC1A4558LDR138K2 C12682R1624KC456PR2033KR174K7R2933KR3033KR75K6 R282K4 R323K6 VR11A50KAVR11B50KAR814K3R3675KR804K3R3575KVR5A50KAVR5B50KAR584K3R3975KR794K3R3775K23148IC6A4558LD657IC6B4558LDC3110/16C3210/16C3310/16C4810/16R41430R4447KR6847KR6643023148IC10A4556657IC10B4556R12047R12147123J2D5LEDD4LEDD3LEDD2LEDD1LEDR4547R4210KR384K3C2910/16R5030KR7430K+VCC-VCCC446.8PC386.8PCUED7LEDR571KR553K3VR850KA23148IC4A2068LDC4610/16C1622/16C722/16C3568PC4168P123J1R4830K1 1%R401K 1%R76300KR471K 1%C5010/16R5630K1 1%657IC4B2068LDMICC4022PD8LEDD9LEDD10LEDD11LEDD12LEDR6947R7510KR784K3C5310/16-VCCR73390KR77390KR72300KVR6A500KAVR6B500KAC520.47/16C8022PC8122PSW4A SW4B SW4C SW4D POWER-15 -9 -3 0 +3-15 -9 -3 0 +3NORM/REVMIC OFFMIC ONTALKOVER192634785IC3LB1403N192634785IC7LB1403NR5375KR6175KR4375KR6475KSW6A SW6B SW6C SW6D CURVESW5A SW5B SW5C SW5D X3 R311K5R261K5VR1B50KEx2VR4A50KEx2VR4B50KEx2C21154C3562C17154C14103657IC1B4558LDR128K2 C20682R2524KC2256PR1133KR144K7R2433KR2733KR85K6 R232K4 R343K6 C9181R155K6R9100K657IC2B4558LDR42KC8181R195K6R221KR211KIC5-8IC5-4IC2-4IC3-4IC7-8IC3-8IC7-4IC2-8C2810/16C2610/16SW7ASW7BSW7CSW7DC7910/16C7610/16VR9A10KAx2R111100K23148IC9A4558LDVR9B10KAx2R882KR841K5R1011K5VR13A50KEx2VR13B50KEx2VR12A50KEx2C58154C74562C63154C6910323148IC8A4558LDR1058K2 C71682R10924KC7556PR10033KR1124K7R10633KR8933KR995K6 R912K4 R923K6 R831K5R821K5VR12B50KEx2VR10A50KEx2VR10B50KEx2C57154C68562C54154C70103657IC8B4558LDR1088K2 C62682R9324KC6156PR10333KR854K7R10733KR8633KR1045K6 R902K4 R943K6 C60181R965K6R110100K657IC9B4558LDR872KR955K6R981KR971KIC6-8IC6-4IC8-8IC8-4C5510/16C5610/16D6LEDR594K3+VCC-VCCSW8BSW8ASW3ASW3BSW3CSW3DSW1ASW1BR7110C4722/16IC2-8R4910C3722/16IC3-8R510C1022/16IC5-8R10210C6422/16IC6-8R210C522/16IC7-8R11410C7222/16IC8-8R12210C82220/16-VCCR7010C5122/16IC2-4R6510C4322/16IC3-4R610C222/16IC5-4R11510C7822/16IC6-4R310C1322/16IC7-4R11310C6522/16IC8-4R12310C83220/16+VCCR4643KR5243KR6043KR6343KX1X5CH1CH2SPLX2C300.47/16+VCC-VCCC19182C18182C66182C67182C7710/16C59181C7310/16C2410/16C2310/16VR7A50KAVR7B50KAC4247/16C3947/1623148IC5A4558657IC5B4558R1162KR1172KC3622PC4522PCUE LEVELR6710C4922/16R5410C3422/16+VCC-VCCR11820KR11920K654321LRX-FADERGREENGREENGREENREDREDGREENGREENGREENREDRED1 -2 2 -1 X-FPH1;PH2LN1GAINCH-1LN3;PH3LN2GAINCH-2R5120KR6220KR12420KR12520KSW423148IC1A2068LD657IC1B2068LDR13100KR98K2R12180R1147KR68K2R747KR1180R5100KC9822C856C11273C456C2273C6822C147/16C547/16R81KR41KC1210/16C710/16R141KR31KPH1+1-1X1J1AJ1B657IC2B2068LD23148IC2A2068LDR26100KR248K2R28180R2247KR218K2R1647KR17180R18100KC18822C2156C23273C1656C14273C17822C2047/16C2447/16R231KR201KC1910/16C1310/16R251KR151KSW1ASW1BPH2/L2PH2/L2+3-323148IC3A2068LD657IC3B2068LDR41100KR408K2R39180R3847KR358K2R3447KR29180R33100KC33822C3256C36273C2856C26273C31822C2547/16C2947/16R361KR321KR431KR441KC38101C39101C3510/16C3710/16C3010/16C4010/16R311KR421KSW2ASW2BPH3/L2PH3/L2L3+2X2J2AJ2B-2+VCC-VCCX4X3D31N4002D41N4002C441000/25C471000/25Vin1GND2Vout3IC47812Vin2GND1Vout3IC57912C431/50C461/50AC15V-JACKD2Z 12VD1Z 12VSW3BSW3AR48750R4775012J4POWERC48100/16C45100/16R210C322/16+1R3010C2722/16-VCC+2R1010C1022/16-1R3710C3422/16+VCC-2R2710C2222/16R1910C1522/16+3-3J2CMASTERX4IN/OUT PCBPage 8Schematic