Princeton_112_Plus_Service_Manual 电路图.pdf

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1、PRINCETON 112 PLUS p/n 022-6704-010 (120V) SERVICE MANUAL CONTENTS: Notices Specifications Therory of operation Parts lists: PCB Assembly Chassis assembly Footswitch assembly Cabinet assembly Miscellaneous Schematics Service diagram Fender Musical Instruments Corp.7975 North Hayden Road Scottsdale,

2、AZ 85258 PRINCETON 112 PLUS (This is the model name for warranty claims) APRIL 1995 REV A IMPORTANT NOTICE: The information contained herein is CONFIDENTIAL and PROPRIETARY to Fender Musical Instruments Corp. It is disclosed solely for use by qualified technicians for purposes of equipment maintenan

3、ce and service. It is not to be disclosed to others without the expressed permission of Fender Musical Instruments Co. All specifications subject to change without notice. For warranty repair service, only Fender specified part numbers are to be used. It is recommended they also be used for post-war

4、ranty maintenance and repair. Parts marked with an asterick (*) indicate the required use of that specific part. This is necessary for RELIABILITY and SAFETY requirements. DO NOT USE A SUBSTITUTE! A coded naming convention is used in the description of certain parts. The codes and what they mean are

5、 as follows: CAPACITOR CODES HARDWARE CODES CAP AE=Aluminum ElectrolyticBLX=Black Oxide CAP CA=Ceramic AxialCR=Chrome Plated CAP CD=Ceramic DiskHWH=Hex Washer Head CAP MPF=Metalized Polyester FilmM=Machine Screw CAP MY=MylarNI=Nickel Plated CAP PFF=Polyester Film/FoilOHP=Oval Head Phillips PB=Partic

6、le Board RESISTOR CODESPHP=Pan Head Phillips PHPS=Pan Head Phillips Sems RES CC=Carbon CompSMA=Sheet Metal A Point RES CF=Carbon FilmSMB=Sheet Metal B Point RES FP=Flame ProofSS=Stainless Steel RES MF=Metal FilmTF=Thread Forming RES WW=Wire WoundZI=Zinc Plated 1 RadioFans.CN 收音机爱 好者资料库 SPECIFICATION

7、S Part Number:022-6704-010 (120V) 022-6734-010 (240V Australia) 022-6744-010 (230V UK) 022-6764-010 (230V) 022-6774-010 (100V) Input impedance:Greater than 1M Ohm Nominal input level:100mV Power output:63 Watts R.M.S. 5% T.H.D Rated load impedance:8 Ohms Effects loop:Nominal level-10 dBv Output impe

8、dance1k Ohm Input impedance16k Ohms Dimensions: Width:18-5/8 inches(47.3 cm) Height:16-1/2 inches(41.9 cm) Depth:9 inches(22.9 cm) Weight:28 lbs.(12.7 kg) THEORY OF OPERATION PREAMP Input jack J1 contains the switching circuit for the inhibit function of the 4053 CMOS switch (U7). Without a plug ins

9、erted into J1 -8Vdc is available to pin 6 of U7A. This inhibits the CMOS switch from functioning, effectively muting the preamp. When the input plug is inserted into J1, +8Vdc becomes available at the inhibit line allowing the CMOS switch to function. TROUBLESHOOTING TIP: When the channel switching

10、circuit does not operate, first check that the inhibit voltage toggles properly. In some cases a faulty CMOS switch can load down the inhibit line. Desolder pin 6 (of U7) and check that the voltage toggles between -8Vdc to +8Vdc. If so, the CMOS switch may need to be replaced. The first stage (U1A)

11、sets up the initial response of the amplifier. It provides a second order high pass filter with a 3dB down point at 60 Hz, and a gain of about 3.5. The output of U1A splits to feed the clean and overdrive channels. For the clean channel, the signal feeds the treble and bass controls, which provide b

12、oost and cut respectively. The signal then flows to the Auto-pad circuit (U1B). It provides excellent headroom and low noise. At upper volume control settings, it also rolls off low frequencies. The signal split from U1A feeds the overdrive channel through a special tone shaping circuit located just

13、 prior to U2A. This circuit is a third order bandpass filter with a peak boost at 2.2kHz. It provides the optimum frequency response for the distortion circuit that follows. U2A provides the variable gain adjustment that drives the distortion circuit. It also acts as a bandpass filter with 3dB down

14、points at 90Hz and 4kHz. U2B is the distortion circuit. LD1 and LD2 provide diode distortion. The Contour control adjusts the overall tone quality of the overdrive channel by emphasizing or notching the mid range frequencies. In the fully CCW position the response is fairly flat up to about 2kHz, wh

15、ere a gentle roll-off occurs. In the fully CW position, the circuit provides a -20db notch at about 1kHz. The signal then feeds the overdrive volume control and then to the treble and bass controls. U3B sums the clean and overdrive channels through CMOS switches U7B and U7C. The output from U3B feed

16、s the reverb drive circuit (U4B) and summing amp U3A. U4A is the reverb sensing circuit. The output of U4A drives the reverb volume control and then feeds through U7A, which sums the reverb with the dry signal at U3A. The output of U3A drives the preamp out jack, is normalled through the power amp i

17、n jack, and feeds the power amp input. 2 RadioFans.CN 收音机爱 好者资料库 THEORY OF OPERATION CONT. CHANNEL AND REVERB SWITCHING The A.C. voltage from the power transformer secondary is tapped off through dropping resistor R73, and presented to the footswitch jack (Approx 20 V R.M.S.). By rectifying the posi

18、tive or negative side of the waveform, we create a D.C. control voltage that is sensed by comparators U6A and U6B. Diodes CR18 and CR21 set up the reference voltages for the comparators. Therefore the control voltage must toggle above and below the reference voltage to cause the output of the compar

19、ator to toggle between +15Vdc and -15Vdc. The comparator output controls the state of the CMOS switches and the indicator LEDs. Without the footswitch connected to the footswitch jack, CR15 rectifies the negative half of the waveform. U6B senses the DC control voltage, and provides -15vdc to U7A, al

20、lowing the reverb output to function. POWER AMPLIFIER U5 is a high voltage op-amp that provides voltage gain for the power amplifier. CR3 and CR4 act as differential protection diodes that prevent the positive and negative inputs of U5 from becoming more than 0.6 volts apart. Bootstrap Capacitors C3

21、8 and C39 sense the output through R60. This provides more voltage swing for the opamp with respect to ground. Diodes CR5 - CR8 (BYV26D) make up the Fixed Bias circuit for the output transistors. The Bias Diodes mount through a hole in the transistor heatsink. This insures the Diodes will properly t

22、rack the temperature of the output transistors. These Diodes were selected because they exhibit a 2mV decrease in Knee Voltage for every 1 degree (Celsius) increase in temperature. Pin 6 of U5 is at 0 Vdc. Therefore the Bias Diodes provide 2 voltage drops (+/-1.2volts) to the Base of Darlington Tran

23、sistors Q1 and Q2. TROUBLESHOOTING TIP: With the circuit board removed, the heatsinking for the output transistors is greatly reduced. With no signal applied, the Bias/Idle current will cause the output transistors to quickly overheat. Use a jumper wire to short across the bias diodes. The easiest w

24、ay is to jumper from the bases of opposing output transistors. This will turn off the transistors. Diodes CR9 - CR12 make up a voltage clamp protection circuit. If the bases of the output transistors reach 4.5 volts with respect to the output, the diodes will turn on, clamping the bases of the outpu

25、t transistors. The output signal feeds through the Headphone jack circuit, before driving the speaker. With headphones connected to the Headphone Jack, the speaker is muted and a new feedback path is created through R78. PARTS LIST PRINTED CIRCUIT BOARD ASSEMBLY QTY PART # DESCRIPTION REFERENCE DESI

26、GNATION 1048523001PCB ASSY PRINCETON 112 PLUS 1028104BUTTON PUSH SWITCH BLACK( S1 DRIVE SELECT) 1028577CABLE ASSY REVERB 30( P1-4) 4038689CAP AE AX .47F100VC15,16,28,34 6025960CAP AE AX22F16VC9,10,25,32,40,41 1038690CAP AE AX1.0F100VC53 5026517CAP AE AX2.2F50VC7,35,37,42,43 1038691CAP AE AX4.7F50VC3

27、6 4028471CAP AE RDL47F50V20%C38,39,51,52 2041048CAP AE RDL2200F50V20%C47,48 2038703CAP CA.1F50V5%C49,50 1038873CAP CA22pF100V5%C31 1038698CAP CA47pF100V5%C33 3038699CAP CA100pF100V5%C6,24,27 1038701CAP CA470pF50V5%C14 1039262CAP CA680pF100V5%C17 1039263CAP CA1000pF100V5%C3 1039264CAP CA1500pF100V5%C

28、22 2039265CAP CA2200pF100V5%C8,26 1039266CAP CA3300pF100V5%C21 2039268CAP CA4700pF50V5%C1,2 1027281CAP MPF .22F63V10%C5 2027286CAP MPF .47F63V10%C4,44 1036234CAP PFF RDL.015F100V10%C29 1033590CAP PFF RDL.022F100V10%C20 6033591CAP PFF RDL.033F100V10%C11-13,30,45,46 3033592CAP PFF RDL.047F100V10%C18,1

29、9,23 2037324CONTROL 100K 30C SNAP INR23,32(GAIN,DRIVE CH-TREBLE) 2037323CONTROL 50K 15A SNAP INR8,9(CLEAN CH TREBLE,BASS) 2034719CONTROL 50KB SNAP INR30,44(CONTOUR,REVERB) 2038658CONTROL RTRY 50K 30CR16,31(CLEAN/DRIVE VOLUME) 1040552CONTROL 250K 30CR37(DRIVE CHANNEL BASS) 2064089DIODE 1N4003 200PRVC

30、R13,14 13006260DIODE 1N4448 75PRVCR1-4,9,12,15-21 4020534DIODE 1N5402 RECTIFIER 200PRV C&FCR22-25 4028776 *DIODE BIAS BYV26D LEAD FORMEDCR5-8 2027329DIODE ZEN 1N5228B 3.9V 5%CR10,11 2028119DIODE ZEN 1N5353B 16V 5W 5%CR26,27 2026000FSTN TAB MALE PCB MT .187x.032CP11,12 10025802FSTN TAB MALE .250 x.03

31、2 PCB MTCP1-10 2025996FUSE CLIP PCB .250 & 5MM FUSE( XF1) 1048827FUSE QA 1-1/4x1/4 250V 2AMPF1(100V/120V ONLY) 3 RadioFans.CN 收音机爱 好者资料库 PARTS LIST PRINTED CIRCUIT BOARD ASSEMBLY CONTINUED QTY PART # DESCRIPTION REFERENCE DESIGNATION 1020789FUSE QA 20mmX5mm 250V 1AMPF1(220V/230V/240V ONLY) 1028497HE

32、ATSINK PLATE(TRANSISTOR MOUNT) 1028120IC 4053B TPL 2 CHAN ANLG SWU7 4016795IC DUAL OP AMP TL072CPU1-4 1031611IC DUAL OP PC4560U6 1028047IC OP AMP MC1436PIU5 2040903INSULATOR MICA TO-218( Q1,2) 3037036JACK PHONE PCB MONO CA PREMIUMJ2,3,5(PRE OUT,PWR IN,FTSW) 2031570JACK PHONE PCB STEREO PREMIUMJ1,4(I

33、NPUT,HEADPHONE) 8020888JUMPER WIRE 22GA .5x.175W1-8 1028098LED 5x5mm GREEN SLB-55MG3LD3 1028039LED RED 5x5mm SLB-55VR3LD4 29902202281 *LED RED LONG LEAD LUMEX CS02LD1,2 1040538PCB FAB PRINCETON 112(BLANK BOARD) 1024947RES CF1/4w5%47R40 1024961RES CF1/4w5%70R10 1029609RES CF1/4w5%10R82 4024965RES CF1

34、/4w5%1KR18,27,49,75 1024969RES CF1/4w5%1.5KR43 3024971RES CF1/4w5%2.2KR15,62,63 2024973RES CF1/4w5%3.3KR22,24 2024975RES CF1/4w5%3.9KR52,71 5024977RES CF1/4w5%4.7KR39,95-98 1028034RES CF1/4w5%5.1KR4 1024979RES CF1/4w5%6.8KR5 1025942RES CF1/4w5%7.5KR14 1024980RES CF1/4w5%8.2KR21 11024981RES CF1/4w5%1

35、0KR41,74,77,78,80,84,85,87,88,90,91 2024985RES CF1/4w5%15KR6,35 5024987RES CF1/4w5%22KR7,11,19,20,34 2024988RES CF1/4w5%27KR53,54 1024989RES CF1/4w5%33KR1 4024993RES CF1/4w5%47KR28,29,33,36 2026507RES CF1/4w5%62KR51,70 3024997RES CF1/4w5%100KR48,50,92 2025058RES CF1/4w5%180KR12,17 5025059RES CF1/4w5

36、%220KR13,26,38,42,46 2025065RES CF1/4w5%270KR25,47 2028018RES CF1/4w5%510KR2,3 1025067RES CF1/4w5%680KR55 4025069RES CF1/4w5%1MR76,79,86,89 PARTS LIST PRINTED CIRCUIT BOARD ASSEMBLY CONTINUED QTY PART # DESCRIPTION REFERENCE DESIGNATION 1025074RES CF1/4w5%1.8MR45 1037169RES CF1/2w5%1.8KR81 1028861RE

37、S CF1/2w5%3.3KR83 1027346RES FILM1w5%1.2KR73 2028029RES FILM1w5%1.5KR57,59 2037354RES CF1w5%4.7KR61,64 1028045RES FILM1w5%220R60 2028030RES FILM1w5%680R56,58 2028021RES FILM2w5%470R68,69 1028022RES FILM2w5%120R67 1027478RES WW BT5w10%.22R72 2028028RES WW BT5w10%.47R65,66 2028037RES WW BT5w10%330R93,

38、94 2027638SCRW TF 4-40 x3/8 HWHS ZI( Q1,2) 2032908SCRW TF 6-32x3/8 PHP ZI(HEATSINK TO PCB MOUNT) 29904701440SPACER LED .7x.125 BLUE( LD3,4) 1028091SWITCH PUSH SLFLK SHORT STROKES1(DRIVE SELECT) 2028169WSHR SHLDR NYL 5/32x1/4( Q1,2) 1016739XSTR NPN 2N4401 TO-92Q3 1028114XSTR NPN TIP142 TO-218ACQ1 102

39、8115XSTR PNP TIP147 TO-218ACQ2 4 PARTS LIST CHASSIS ASSEMBLY QTY PART # DESCRIPTION REFERENCE DESIGNATION 1048526CHS ASSY PRNCETON 112PLUS 120V 9033206BUSHING KNOB SPACER 1021709BUSHING SR .437x.062x13/32 BLK( SPEAKER CABLE) 1026116BUSHING SR .500 x.063x7/16 BLK( REVERB CABLE) 1026038BUSHING SR .625

40、x.062x37/64 BLK( PWR CABLE 100/120V ONLY) 1010401BUSHING SR .625X.125X37/64 WHT 230V( POWER CABLE 230V) 1026527CABLE ASSY POWER W/.187 TABS(POWER CABLE 100V/120V ONLY) 1026528CABLE ASSY POWER 230V W/.187 TABS(PWR CABLE 230V EXPORT ONLY) 1036479CABLE ASSY POWER AUST.W/.187 TABS(240V AUSTRALIA ONLY) 1

41、040542CHS PRINCETON 112(RAW CHASSIS) 1028560END BELL XFMR 85w( POWER TRANSFORMER) 1028499HEATSINK BAR(COUPLER TO CHASSIS) 9026403KNOB POINTER BLACK 180 DEG 4028591NUT ACORN 8-32(TRANSFORMER MOUNT) 1048844PANEL FRONT PRINCETON 112 PLUS 1048525PANEL REAR PRINCETON 112 PLUS 4028937SCRW TF 6-32x5/8 PHP

42、ZI ROLOK(PCB TO CHASSIS MOUNT) 1038900SCRW TF 6-32X1/4 PHP ZI( GROUND LUG) 3028500SCRW TF 8-32x3/4 HWH SLTD Z1(CHASSIS TO HEATSINK MOUNT) 4025936STAND OFF PCB PUSH ON NY 3/8L(PCB TO CHASSIS MOUNT) 1025935SWITCH POWER DPST(120V DOMESTIC ONLY) 1039287 *SWITCH POWER DPST .187 TAB GLOBAL(EXPORT ONLY) 40

43、30007WSHR LCK INTL 8x.330 x.02 ZI(TRANSFORMER MOUNT) 1027668XFMR POWER 120V 85W(120V DOMESTIC ONLY) 1039357XFMR POWER EXPORT DELUXE 112(100V/115V/230V) FOOTSWITCH ASSEMBLY (OPTIONAL) QTY PART # DESCRIPTION REFERENCE DESIGNATION 1028122FOOTSWITCH 2 BTN REVERB F/LOGO(COMPLETE FOOTSWITCH) 2006260DIODE

44、1N4448/1N914B SIGNALCR1,2 1037036JACK PHONE PCB MONO CA PREMIUMJ1 2028039LED RED 5X5MM SLB-55VR3LD1,2 2028714SWITCH PUSH SPDTS1,2 PARTS LIST CABINET ASSEMBLY QTY PART # DESCRIPTION REFERENCE DESIGNATION 1040547CAB ASSY PRINCETON 112(COMPLETE CABINET) 1022491CLAMP CABLE NYL SCRW MNT 5/16( REVERB CABL

45、E) 4026566CORNER 2 HOLE w/TAB NI(TOP REAR, BOTTOM FRONT) 2026568CORNER 3 HOLE NI(BOTTOM REAR) 4029821EYELET RFLNGD .215 OD x.315 L(REVERB PAN MOUNT) 4019276GLIDE CAB 1.24x.335 NI(STEEL ONLY) 4019275GLIDE CUSHION INSERT(RUBBER ONLY) 1040548GRILLE BAFFLE ASSY PRNCTON 112(COMPLETE GRILLE) 1027846HANDLE

46、 9.25(RUBBER ONLY, NO INSERT) 2019279HANDLE CAP 2-3/16 NI(HANDLE MOUNT) 1032524INSERT HANDLE(SPRING STEEL) 1011298NAMEPLATE FENDER SMALL(LOGO 4021972NUT T 10-32x3/4 STR 3 PRNG BLX(HANDLE MOUNT) 1028055REVERB UNIT 800 ohm 8EB2C1B DN(PAN) 10026571SCRW CORNER MOUNTING 4022244SCRW M 10-32x1-1/8 OHP NI(H

47、ANDLE MOUNT) 4026625SCRW WOOD 8x1 FH(GLIDE MOUNT) 4026577SCRW M 10-32x1 PHP BLX(SPEAKER MOUNT) 6036199SCRW M 8-32x1-3/16 OHP BLX WX(CHASSIS MOUNT) 5029828SCRW PB 8x3/4 PHP ZI(REVERB PAN/CABLE CLAMP MNT) 2018113SCRW SMA 4x1/2 OHP BLX(LOGO MOUNT) 2011678SCRW SMA 8x1-1/2 OHP BLX(GRILLE MOUNT) 1025923SPEAKER 12 8ohm 75 WATT 8029527WSHR FNSH 8-5/8 FLNGD BLX WX(CHASSIS/GRILLE MOUNT) MISCELLANEOUS QTY PART # DESCRIPTION REFERENCE DESIGNATION 1048524MANUAL OWNERS PRINCETON 112 1040536SCHEM REDUCED W/SRV PRINCETON 112 5