NAD 7250PE Service Manual Download Page 4 | Manualshive

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NAD 7250PE Service Manual Download Page 4

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Summary of Contents for 7250PE

Page 1: ...SERVICE 7200PE AM FM RECEIVER...

Page 2: ...IFICATION 3 5 INTERNAL VIEW 6 SUGGESTED INSTRUMENTATION HOOKUP 7 FM ALIGNMENTS 8 11 AM ALIGNMENTS 12 13 AMPLIFIER ALIGNMENTS 14 AMPLIFIER P C B LAYOUT DIAGRAM 16 17 SCHEMATIC DIAGRAM AMPLIFIER SECTION...

Page 3: ...U AVANT FRONTSEITE 1 Power 12 Low Level 1 Alimentation 12 Low Level 1 Netzschalter 2 Phones 13 Loudness Compensation 2 Casque d coute 13 Commutateur de contour sonore 2 Kopthorer Anschlu8 3 Speaker Se...

Page 4: ...o 8 ohms 20 Hz 20 kHz both channels driven with no more than the rated distortion Rated distortion THD 20 Hz 20 kHz Clipping power max continuous power per channel IHF dynamic headroom at 8 ohms IHF d...

Page 5: ...requency response 20 Hz 20 kHz OUTPUTS Preamp out impedance Maximum output level Tape output impedance Tape output infrasonic filter CONTROLS Treble Bass Speaker Equalization Infrasonic filter switcha...

Page 6: ...mensions width x height x depth Net weight Shipping weight Mono 30 dB THD N Mono 50 dB S N Stereo 50 dB S N Stereo 60 dB S N Alternate channel Adjacent channel Mono Stereo Mono Stereo 1 kHz 30 Hz 10 k...

Page 7: ...INTERNAL VIEW...

Page 8: ...IC DIAGRAM OF DETECTOR PROBE C1 D2 330p Diodes should be point contact germanium Some commonly available types are OA80 OA81 AA119 1N60 1N34 1N22 FROM TUNER IC PICTORIAL DIAGRAM OF DETECTOR PROBE R1 C...

Page 9: ...until readings are within tolerances RF ADJUSTMENT TRACKING Connect RF generator to 300 ohm antenna input and detectorprobe to pin 1 IC 102 with ground to tunershield Adjust sensitivity of oscillosco...

Page 10: ...output level and fine tune till no reduction in the 3 THD can be achieved by fine tuning Use this frequency for all the follow ing detector MPX and FM NR adjustments NOTE The typical input level for t...

Page 11: ...hannel and FL 103 MPX FILTER on right channel to minimum output NOTE DO NOT ADJUST THE MPX FILTERS UNLESS NECESSARY the cores are brittle and break easily 14 Release the FM NR DEFEAT switch out FM NR...

Page 12: ...je G ees L102P Joa tes os __ Him R167 ssi _ Mita we R158 fi 4 ca ah BA iit po...

Page 13: ...preset 3 Adjust L 951 move tab under label on antenna for maximum reading on meter Use non ineractive tool such as plastic or wooden stick Adjust L 104 and L 106 for maximum reading on meter Tune sta...

Page 14: ......

Page 15: ...TERING VOLTAGE Adjust R 645 left R 695 right so that voltage at spkr terminals is 0 50 mVDC NOTE Perform these adjustments with no load volume minimum Cc MINIMUM DISTORTION 1 Connect distortion meter...

Page 16: ...AMPLIFIER P C B LAYOUT DIAGRAM INPUT OUTPUT PCB JO21A 8 910 11 12 13 Pre OUT Main IN 72 2190 0 0 LED DISPLAY PCB MAIN CONTROL AMP POWER SUPPLY PCB POWER SWITCH PCB 72 2189 0 3 16 17...

Page 17: ...9585 3 C__ J sf e Wee 7584 Pan ee MOL ASE w 3 rs i g 1S g L Si Pee Bk Se Re ea en eR he Re RS ig ee hth wy op te i oe ey Lo a 4 MOOOI ASE MOO0I ASE 1Sse oV z7S89 WV fo z z 3 378341 mo ML D MOLGISH 08...

Page 18: ...TUNER P C B LAYOUT DIAGRAM DISPLAY PRESET SELECTOR PCB ANTENNA TERMINAL PCB sounds 72 2160 FRONTEND PCB TUNER PCB UP DOWN PCB 21 20...

Page 19: ...a 50V 47y aa i es 1I7 2SC1815 QD et R199 1K 6105 2SC 1815 Q113 8114 ens 2SA1015 2SC1815X4 18V 31V 520 1710KHz 6110 2SC1815 R145 8 5 2SA1015 X3 1KX3 YY aK Z IC115 BAGS 5 3 8 a 2 RS om L951 ge ofsiso ES...

Page 20: ...A TERMINAL P C B Z002A st Peassertest ites a _ 4 e a 4 TUNER P C B 1023D p955 956 POWER CORD Ww 3 5 7 POWER SWITCH P C B SO86B ANTENNA CONNECTOR oe TK De INPUT OUTPUT P C B J021A Re SERRE SS oH LEE BS...

Page 21: ...4 0 0 SIDE CHASSIS L 27 71 2587 0 0 SIDE CHASSIS R 28 71 2618 0 0 SUBCHASSIS FRONT TO REAR SUPPORT 29 71 2617 0 0 SUBCHASSIS LEFT TO RIGHT SUPPORT 30 92 1223 0 1 LOCKING PLATE IMPEDANCE SWITCH 31 92 1...

Page 22: ...Y PCB 64 1 41 685 0 0 ROTARY POTENTIOMETER BASS TREBLE 64 2 41 688 0 0 ROTARY POTENTIOMETER VOLUME 64 3 81 188 0 0 ROTARY SWITCH LOUDSPEAKER SELECTOR 64 4 74 3109 0 0 HEAT SINK 64 5 82 2169 0 0 HEADPH...

Page 23: ...AINING RING E TYPE 5 TERMAL LUG 3 Ni A A1 TAPPING SCREW PAN 2 66 Cr MACHINE SCREW PHILLIPS HEAD 3x6 Cr CABINET SCREW WITH WASHER 4x6 BLK MACHINE SCREW PHILLIPS HEAD 3x8 Cr LOCKING PLATE HEAD PHONE JAC...

Page 24: ...EXPLODED VIEW 29...

Page 25: ...C501 uPC4570C INTEGRATED CIRCUIT 1C801 uPC1237H 0 IC851 M5230L 0 0501 0551 2SK363 TRANSISTOR Q502 0503 2SC1815 Q504 2SA1015 0601 Q602 0651 0652 2SC1845 n Q603 0604 0653 0654 2SA992 0 Q605 0611 0655 06...

Page 26: ...R627 R632 R677 R682 R640 R641 R642 R643 R690 R691 R692 R693 R645 R695 R647 R697 R648 R698 R649 R699 R709 R717 R759 R769 R711 R715 R761 R765 R712 R719 R762 R769 R713 R720 R763 R777 R806 R859 R860 R650...

Page 27: ...RIABLE CAPACITANCE L1 11 434 FM ANTENNA COIL L2 L4 L5 11 412 FM RF COIL L3 11 435 L6 12 565 OSC COIL L7 15 152 CHOKE COIL L8 13 533 IFT COIL L9 15 166 CHOKE COIL C2 C10 C12 C20 36 134 TRIMMER CAPACITO...

Page 28: ...C CAPACITOR LOW LEAKAGE C124 5OV 3 3uF C125 C160 C214 5OV 2 24F C126 C169 C215 5OV 1 uF C163 C204 5OV 0 22uF C201 50V 0 33 uF C202 C243 5OV 0 1 4F C213 5 5V 0 047 uF MEMORY BACKUP CAPACITOR R107 R167...

Page 29: ...RIPTION 1C113 TD6301AP INTEGRATED CIRCUIT Q126 Q127 0128 2SC1815 TRANSISTOR D157 D158 DS442 DIODE R299 33K x 13 RESISTOR ARRAY R300 33KQ x 10 FLU101 7AM8AS FL INDICATOR ANTENNA TERMINAL P C B ZO02A EX...

Page 30: ...MANU AL fe AM FM RECEIVER 2 2 9 cc O e lu Os 3...

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