VIBRO-KING SERVICE MANUAL - Studio Sound Electronics
Contents
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3. m VIBRO KING CUSTOM SHOP SERIES ELECTRONICS SERVICE MANUAL Fender Musical Instruments Corp 7975 North Hayden Road Scottsdale AZ 85258 VIBRO KING This is the model name for warranty claims SERVICE MANUAL JUNE 1994 REVA TYPE CSR 4 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 maintenance 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 warranty maintenance and repair Parts marked with an asterisk 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 as follows CAPACITOR CODES HARDWARE CODES CAP AE Aluminum Electrolytic BLX Black Oxide CAP Ceramic Axial CR Chrome Plated CAP CD Ceramic Disk HWH Washer Head CAP MPF Metalized Polyester Film M Machine Screw CAP Mylar NI Nickel Plated CAP PFF Polyester Film Foil OHP Oval Head Phillips PB Particle Board RESISTOR CODES PHP Head P
4. L RES 1 2W 5 470K LL RES CF 1 2W 5 1M LL RES CF 1 2W 5 2 2MLL RES 1 2W 5 10M LL RES FP 1W 470 QLL RES 1W 5 91KLL RES FILM 1W 5 100K LL RES FILM 2W 5 1000 LL RES 2W 5 1 2K LL REFERENCE DESIGNATION USED WITH PHOTOCELLS C23 28 C4 24 25 41 C31 35 38 FILTER CAP PC C3 22 C22 PWR SUPPLY PC C29 30 FILTER CAP PC C7 C36 C16 R2 3 C11 17 R3 38 39 C9 26 27 C2 15 18 12 C5 C1 C6 C10 CR5 CR1 4 CR7 8 2 PCS IN PARALLEL NO BULB R62 63 R27 R14 20 23 33 34 41 R55 R37 R11 12 INPUT JACKS 57 59 R17 61 R10 BIAS POT R26 R24 44 49 56 68 R31 32 40 48 64 65 73 R53 54 R15 21 42 R13 INPUT JACKS R18 25 28 51 52 R45 46 58 R50 R35 V8 36 V7 60 R29 R16 19 22 30 43 47 R70 V3 R66 FILTER CAP PC QTY 1 1 1 1 SARA ES chars deine dus eres o lt c PART 041268001 036923 047057 028503 PART 018002 021560 026038 031105 036486 031091 032219 017502 041264 041266 041265 036702 036703 026559 013115 021741 020773 041469 023760 068270 021626 020772 025718 041263 031625 022004 023580 032806 040909 041220 021642 041267 025936 037835 036570 039214 013341 041255 022319 022327 9904300100 024049 026401 036485 024038 026554 PART 040760 040885 040886 031849 025722 VIBRO KING PRINTED CIRCUIT BOARD ASSEMBLY CONT DESCRIPTION RES CF 2W 5 10K
5. LL RES WW 5W 10 6800 RESWWBT SW 25K THERMISTOR 10 5A C60 11 CHASSIS ASSEMBLY DESCRIPTION BUSHING SNAP 5 16X17 32 BLK BUSHING SNAP 5 8X27 32 BLK BUSHING SR 625X 062X37 94 BLK CABLE ASSY PWR 187 250 120V CHOKE CLAMP TUBE 277H 1 COLLAR PILOT LIGHT CONTROL 10K LIN SCREW ADJ CONTROL B5 MEG LIN CONTROL DUAL B500K LIN CONTROL DUAL B50K LIN FUSE HOLDER 3AG FINGER GRIP FUSEHOLDER 5mm FINGER GRIP FUSE TD 1 1 4X1 4 250V 3AMP FUSE TD 20mmX5mm 250V 2 HOLDER DIAL LITE ASSEMBLY PILOT INSULATOR DUAL PHONO JACK INSULATOR FILTERCAP PC JACK PHONE 3 CD DCC 14B JACK PHONE TIP SHUNT L12A 3 8L JACK PHONE 2 CD SOC L11 3 8 L JACK PHONO DUAL CHS MT JEWEL 20 PILOT LITE KNOB VINTAGE CREAM NUT HOLDER PILOT LIGHT 1 16 27 NUT KEPS 8 32X1 4 PHP BLX SOCKET TUBE 8 PIN SCRW TF 6 32X1 4 PHP BLX PANEL FRONT ALUM VIBRO KING PANEL REAR ALUM VIBRO KING PILOT LIGHT T47 SOCKET TUBE 9PIN PORCEL W SHLD STANDOFF NYLON PCB SNAPIN 3 8 SWITCH SLIDE SPST SWITCH TOGGLE DPST W NUTS TUBE VACUUM 5881 6L6WGC TUBE VACUUM 7025 12AX7 TUBE VACUUM EL84 WSHR FLAT 1 4X9 16NI WHSR FLAT 8X7 16 NI WSHR LCK INTL 3 8X 681X 032 ZI WSHR LCK INTL 5 16X 600X 06 ZI WSHR SHLDR FIB 3 8X5 8 XFMR OUTPUT XFMR OUTPUT 10W SE XFMR PWR MUTI VOLT CABINET ASSEMBLY DESCRIPTION CAB ASSY VIBRO KING BACK ASSY UPPER VIBRO KING BACK ASSY LOWER VIBRO KING BAG REVERB SPRING UNIT CABLE ASSY REVERB 1100mm REFERENCE DESIGNATION R67 FILTER CAP PC R69 R38 FILTER CAP PC
6. LY DESCRIPTION FTSW ASSY 2 BTTN VIB FAT BUSHING SR 500 100 7 16 COVER CUP DUAL FTSW ASSY PLUG PHONE 3 CONDUCTOR 238 RA SWITCH SPST PUSH BUTTON WSHR FLAT 473X 750 NI MISCELLANEOUS DESCRIPTION MANUAL OWNERS VIBRO KING SCHEM REDUCED VIBRO KING REFERENCE DESIGNATION SPEAKER CABLE TILT BACK LEG MOUNT PAN LOGO MOUNT BACK BOARD MOUNT HANDLE MOUNT CHASSIS MOUNT TILT BACK LEGS MOUNT LEG STOP MOUNT SPEAKER MOUNT BACKBOARD ASSY MOUNT TILT BACK LEGS MOUNT TILT BACK LEG MOUNT REFERENCE DESIGNATION COMPLETE FOOTSWITCH 1 2 REFERENCE DESIGNATION VIBRO KING 212 SPEAKER ENCLOSURE DESCRIPTION CORNER 2 HOLE W TAB NI CORNER 3 HOLE NI GRILLE ASSY VIBRO KING 212 HANDLE CAP 1 HOLE NI HANDLE STRAP BRN INSERT HANDLE JACK PHONE OPEN CIRCUIT 11 SCRW M 10 32X1 1 8 OHP NI SPEAKER 12 8 CEL VINTAGE REFERENCE DESIGNATION COMPLETE GRILLE NO INSERT SPRING STEEL HANDLE MOUNT CELESTION VINTAGE 30 T3903 DNL M OTE LA TEOSES YINHOZITYO Yauu JUCO SINZIMFVIMLONI IYOISIDO WHOIS ON HITA 39Y17004 20 ROD TV 1Y 67041007 Te 20 ONY 39YO34MI INANI IV BHI 157371 Y 30 WAG Y SNISN ONDOWS 1334534 03un Y34 35 Y1004 NV 79009 AML AMCZ LYZ 3004 MIZI 001 MI 018 075 We T4 3603 UO 2 T Maias 9007 X74 AE MAAD LO OR ET VAN Sm OMEGA NS
7. esistors in parallel The resistors connect to the ntensity control R9 which varies the amount of attenuation Because the Vibrato circuit connects to the amplifier directly after the Treble control the high frequencies will attenuate before the bass frequencies This simulates a rotating speaker effect TROUBLESHOOTING TIP If the Vibrato does not function first check the footswitch jack The switching part of the jack serves to short one side of R57 to ground If R57 is not grounded the Vibrato will not operate If the Vibrato exhibits a clicking sound the problem is caused by the position of the neon bulb in relation to the LDR s Adjust the bulb by gently pulling on the leads Test and repeat as necessary watts into two 2 Q VIBRO KING THEORY OF OPERATION CONT The signal then feeds the Phase Inverter V5 which is a classic style split load type used without feedback The output tubes 5881 6L6WGC are arranged in a push pull configuration that will produce sixty 60 BIAS PROCEDURE The bias measured at pin 5 of V7 or V8 should be set to 46Vdc However the Bias need not be measured to be accurately set To set the Bias without removing the chassis set the Volume knob between 1 1 2 to 2 The Bias control is located on the under side of the chassis next to the power cable Adjust the Bias so the amp produces the maximum Hiss Strum a full chord and let ring Now turn the Bias control back just to the point that the s
8. hillips PHPS Head Phillips Sems RES Carbon Comp SMA Sheet Metal A Point RES CF Carbon Film SMB Sheet Metal B Point RES FP Flame Proof SS Stainless Steel RESMF Metal Film TF Thread Forming RES WW Wire Wound 2 Zinc Plated VIBRO KING THEORY OF OPERATION J1 and J2 are summed by R11 and R12 These 10K resistors are a lower than usual value for a tube amplifier This value was chosen for two reasons 10K is smaller than 33K or 68K therefore the amplifier will produce less noise at high volume settings Secondly when linking two or more amplifiers a common trick is to plug the guitar into Input 1 and use Input 2 as the output to the next amplifier With 68K Q resistors 1 10 of the signal is lost with each link After the input resistors the signal is split and fed to V1A and V2A V1A serves as a preamp for the Reverb Drive or Dwell control The Dwell control feeds V3 a small power tube which drives the Reverb V2A is a Cathode Follower circuit which creates a low impedance isolated from the input signal to drive the Mix control R2 V2B amplifies the Reverb return Sense signal and sends it to the Tone control R3 High frequencies are sent shunted to ground via C17 Varying R3 will move the wiper closer to or further from C17 thus making the Reverb brighter Clockwise or duller Counterclockwise The Reverb signal then sums with the Dry signal at the Mix control 2 After
9. ound of the guitar loses warmth and sustain Then increase it slightly This will ensure minimum crossover distortion and the best sound o lt 9 222 DD ORAND PART 080083 031069001 009512 024819 026502 013638 031780 007029001 020917001 024824 024835 024846 024861 026202001 026204 033620001 064089001 026730001 029690001 038553 026368001 9901218221 026549001 026493001 036955001 025113001 025832001 041278001 025116001 025117001 041279001 036957001 9901251021 041280001 037663001 036468001 027352001 027353001 036351001 041269001 PARTS LIST PRINTED CIRCUIT BOARD ASSEMBLY DESCRIPTION BULB NEON TYPE A2B CAP AE RDL 10uF 100V 20 LL CAP AE AX 22uF 25V 20 CAP AE AX 22uF 500V AE AX 100uF 100V CAP AE AX 220uf 285V CAP SLVR MICA 150pF 300V CD 220 1000V 10 LL CD 250 1000V 10 LL CAP MPF RDL 01uF 630V 10 CAP MPF RDL 022uf 630V 10 MPF RDL 1uF 630V 10 CAP MPF RDL 22uF 250V 10 CAP PFF RDL 0022uF 600V LL CAP PFF RDL 0068uF 600V CAP PFF RDL 47uF 100V 10 LL DIODE 1N4003 LL DIODE 1N4006 800V LL DIODE HV 3KV 200mA LL PHOTOCELL CDSE LDR RES CF 1 2W 5 1000 LL RES 1 2W 5 8209 LL RESCF 1 2W 5 1 5K RESCF 1 2W 5 2 7K LL RES 1 2W 5 6 8K LL RES CF 1 2WN 5 10K LL RES 1 2W 5 22K LL RES 1 2W 5 39K LL RES 1 2W 5 100K LL RES 1 2W 5 220K LL RES CF 1 2W 5 270K L
10. the Mix control the signal travels to the Send jack J3 of the Effects Loop The signal is then Normaled to the Return jack J4 and drives V4A This configuration allows the Reverb functions of the Vibro King to be sent out to other amplifiers via the Send jack It also enables a player to insert a delay unit between the reverb and the amplifier for a Rock A Billy type effect A Volume pedal can also be inserted to control the Guitar and the Reverb The VAA circuit contains the Fat switch 1 The Fat switch connects C4 to ground to provide a 3dB increase in gain mostly in the low and mid frequencies R17 is there to prevent popping of the Fat switch when actuated NOTE the Fat switch may pop the first time it is switched This is due to the warm up stabilization cycle of the tube The Volume control is linked to RAB R4B reduces the gain of the Reverb at high volume levels This allows adjustment of the Volume without readjusting the Reverb Mix control From the Volume control R4A the signal is fed to V4B the Tone control driver section The signal leaves the tone controls through the Treble control R5 and is fed to the Vibrato and Phase Inverter circuits V6B is a low frequency oscillator The Speed control R8 varies the oscillation frequency V6A is the Neon Lamp driver The lamp flashes faster or slower based on the position of the Speed control R8 The brightness of the neon bulb is sensed by two LDRs Light Dependent R
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