SERVICE MANUAL - Music Electronics Forum
Contents
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3. G DEC Jr Srl ex This is the model name for warranty claims p n 2351000000 120V SERVICE MANUAL a p GUITAR DIGITAL ENTERTAINMENT CENTER ATTENTION WARRANTY SERVICE PROCEDURES Domestic U S amp Canada Only The G DEC Jr Amplifier is not available for warranty field service Any Dealer Service Center in possession of a G DEC Jr with a warrantable defect should contact the Fender Customer Service Support Center toll free at 866 345 3642 or email service fender com to arrange for a replacement This manual should only be referred to for non warranty repairs Non Domestic FMIC acknowledges that many of our International Distributors are able to perform field or in house warranty service on the G DEC Jr Amplifier Fender Musical Instruments Corporation 8860 East Chaparral Road Suite 100 Scottsdale AZ 85250 Issued February 2007 Fender G DEC Jr This is the model name for warranty claims February 2007 IMPORTANT NOTICE Copyright 2007 FMIC All rights reserved All information contained herein is CONFIDENTIAL and PROPRIETARY and is the property of Fender amp Musical Instruments Corporation t is not to be sold or assigned to another party and is disclosed solely for use by Fender Authorized Service Centers for purposes of product service and maintenance All information is not to be dis closed to others without the expressed permission of Fender amp Musical Instruments Cor
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5. HEAT SINK Non serviceable part Replace complete parent assembly See PCB EXCHANGE POLICY section above shaded Unique Fender part Order directly from the FMIC Parts Department shaded Access to this part or assembly is controlled Please contact the FMIC Customer Service Department Safety Requirement part Replacement must match Safety Agency Value if specified if specified Approval Mark s if on part shaded Both a unique Fender part and a Safety Requirement part as defined above Fender 9 G DEC Jr This is the model name for warranty claims PARTS LIST END ITEM ASSEMBLY QTY PART DESCRIPTION REFERENCE DESIGNATION 1 REF CABINET ASSY G DEC Jr 5 REF SCREW M 4X30 BLK T H CABINET BACK 1 REF SPEAKER 8 8 OHM G DEC Jr 4 REF NUT FLANGE M 4 ZNP SPEAKER 1 0047248000 CORD PWR CONN DOM 120V ONLY 0047249000 CORD PWR W IEC CONN 230V UK 230V UK ONLY 0047250000 PWR W IEC CONN 240V 240V AUS ONLY 0047251000 CORD PWR CONN 230V 230V EUR ONLY 0057674000 _ CORD PWR W IEC CONN 230V ARG 230V ARG ONLY 0053997000 CORD PWR W IEC CONN 100V JPN 100V JPN ONLY 1 0072802000 BADGE G DEC 2 _ REF SCREW T 2 1X10 NIP R H BADGE 1 0051043000 NAMEPLATE FENDER GENERIC 4 10036500000 ESCUTCEHON PINS NAMEPLATE 1 REF MANUAL OWNERS G DEC Jr 5 R
6. INTERFACE The 4 16 position encoders 52 S5 for the LOOP AMP KEY and EFFECT SELECT are read via the port expander 09 and the data sent to the uDSP sys tem via the interface lines SCL and SDA The 4 potentiometers VOLUME R51 GAIN R49 TONE R44 and TEMPO R31 generate DC volt ages 1 0V to 4 0V that are read by the analog multiplexer U6 1 0 1 are the digital control lines used to multiplex these analog signals which are sent serially to the system CODEC U13 on the Rin channel The LOOP START STOP button and the state of the HEADPHONE present signal are read in a similar manner The uDSP system reads the state of these controls and inputs digitally from the CO DEC The LOOP VOLUME is a conventional analog con trol which accepts the MIDI left and right loop audio signals from the SAM2195 MIDI Synthesizer via the mixer op amp U7 B Fender G DEC Jr This is the model name for warranty claims PARTS LIST MAIN PCB ASSEMBLY QTY PART DESCRIPTION REFERENCE DESIGNATION 1 REF PCB ASSY G DEC Jr MAIN COMPLETE PCB ASSY FIELD SERVICE ON THIS ASSY LIMITED TO THE PART NUMBERS LISTED BELOW 5 REF WASHER TOOTHED AW 3 PCB MOUNTING 2 0072781000 JACK DIN PIN J4 MIDI IN 5 REF CONTROL 10kB R3 R31 R38 R44 R49 R51 4 0055983000 ENCODER 16PS 4BITGRY RTRY 52 55 1 0041812000 REGULATOR 5V MC7805CT U5 1 0051934000 IC POWER AMP TDA2050V 32
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8. headphone is connected and in turn drives the power Amp I C via R36 FET Q1 provides system muting during power up down in conjunction with the power sense circuits comprised of D10 Q2 Q4 MAIN POWER HEADPHONE AMPLIFIER U3 is a 15 Watt monolithic power amp device which drives the 8 ohm speaker Fender conventional cur rent feedback is applied to the power amplifier via current sense resistor pair R24 R26 and the voltage feedback to the amp via R28 R30 Current feedback affects the power amplifier output resistance so it re acts with the speaker load similar to a tube amplifier The main internal speaker Bohms minimum load is connected at P3 4 The internal speaker is discon nected if a connection is made to the Headphone Jack J2 Op Amp U1 A and U1 B act as the headphone am plifier when a headphone is plugged into J2 The gain of U1 A goes from unity to 21 dB when a head phone is plugged in U1 A drives the left side of the headphones and U1 B drives the right side of the headphones uDSP System The uDSP system is integrated on the main PCB of the G DEC Jr The UDSP system is comprised of the microprocessor U10 TMS320VC5501 and associ ated memory static RAM U14 and flash ROM 011 Signals to and from the uDSP chip are in serial digi tal format Signal input is from the encoder portion of the CODEC U13 and output to the decoder portion of the CODEC U13 The CODEC converts the analog input signal to dig
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13. 50Hz EUR DS 100V 50 60Hz JPN DS 110V 60Hz TW DS 220V 50Hz ARG DS 220V 60Hz ROK DS Power Requirement Fuses Input Sensitivity Power Output Impedances Input Front Rear Aux In L R Speaker Complement Dimensions Height Width Depth Weight G DEC Jr PR 718 2351000000 2351000900 2351030900 2351040900 2351060900 2351070900 2351010900 2351050900 2351090900 50W T 600 mA 250V for 100V versions T 500 mA 250V for 120V versions T 250 mA 250V for 220 240V versions 30 mV volume at maximum for full power tone centered 15W RMS into 8 ohms lt 5 THD 100Hz gt 1M Ohm 100 k Ohm 8 8 ohm special design P N 0072797000 12 5in 32cm 13 25 in 34 cm 7 25in 19cm 15105 6 8 kg Product specifications are subject change without notice Fender 5 G DEC Jr This is the model name for warranty claims SERVICE NOTES 1 CHASSIS REMOVAL is accomplished by first removing the eight 8 screws from the cabinet back panel The cabinet back may be removed by gently prying it out using a flat screwdriver Next remove the two 2 screws from the rear top of the cabinet into the chassis Last remove the two 2 handle screws at the cabinet top that secure the chassis Disconnect the speaker wires form the speaker and gently slide the chassis out from the rear MAIN PCB REMOVAL is accomplished by first removing the eleven 11 wires at the Faston conne
14. EF SCREW NO 8 U32X30 BLK O H CHASSIS TOP AND REAR 3 IREF SCREW M 3 5X10 BLK T H CHASSIS REAR 4 WASHER BLK FINISHING CHASSIS 1 0037121000 HANDLE RIBBED 9 1 4 2 0032524000 STRAP METAL INSERT 2 0025395000 HANDLE CAPS NICKEL 2 M AX32 NIP O H HANDLE 4 FOOT RUBBER 18X10 4 T 2 1X8 BLK R H FEET Non serviceable part Replace complete parent assembly See PCB EXCHANGE POLICY section above shaded Unique Fender part Order directly from the FMIC Parts Department shaded Access to this part or assembly is controlled Please contact the FMIC Customer Service Department Safety Requirement part Replacement must match Safety Agency Value if specified Type if specified Approval Mark s if on part shaded Both a unique Fender part and a Safety Requirement part as defined above This is the model for warranty claims Fender G DEC Jr Service Diagram List Service Diagram Schematic G DEC Jr PCB 40 5 90 230 alvd 3572738 5158 7 73114 3SVBVlVO O310N 3SIMN3HI0 SS31Nn S310N 0 1 c 8 22 q HERONS NVTAVA NAVE XG SHOISIS3H T 1 31vd 40 3uv SYOLIOVdVD SSVdAB ATddNS N3MOd M438AQN ONIMVAG ssy God A8 Q3AONddV WAWININ AOS xOZ 4n SHOllvdVO O3Zhivl0d TV a 53001 11 n a Sat
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16. W U3 1 REF HEAT SINK G DEC Jr U3 05 2 REF SCREW M3X10 BLK B H U3 05 2 REF WASHER FLAT M3 U3 U5 2 REF NUT M3 NIP U3 U5 2 REF WASHER SPLIT LOCK M3 U3 U5 2 REF BUSHING PATR 2935 U3 05 2 REF SILICONE PAD TO 220 U3 U5 4 0051658000 JACK MONO 1 4 J3 INPUT 2 0072780000 JACK 3 5 mm STEREO W SWITCH J1 J2 AUX INPUT HEADPHONE OUTPUT PARTS LIST QTY PART REF REF REF REF REF 0039287000 REF 006470600 REF 0048451000 REF 0072791000 0048381000 0003111000 REF REF REF REF REF REF REF 5 1 1 WINI DESCRIPTION CHASSIS G DEC Jr PCB ASSY G DEC Jr MAIN G DEC Jr 120V G DEC Jr 230V G DEC Jr 100V POWER SWITCH SNAP IN TRANSFORMER GASKET KNOB ROTARY G DEC Jr KNOB ENCODER G DEC Jr PUSH BUTTON IVORY WASHER DIA 9 CRP IEC INLET FUSE T600mA 5X20MM FUSE T500mA 5X20MM FUSE T250mA 5X20MM M3X5 ZNP AW 3 FLANGE NUT M 4 ZNP TF 6 32X6 BLK B H T 2 1X8 BLK R H TF 4 40X6 ZNP B H CHASSIS ASSEMBLY REFERENCE DESIGNATION COMPLETE PCB ASSY TRANSFORMER BASE POTS with flat washer and nut FX KEY AMP LOOP with flat washer and nut LOOP START STOP 2EA INSIDE OF ENCODER SHAFTS AC INLET 100V UNITS ONLY Littelfuse 218P 600 120V UNITS ONLY Littelfuse 218P 500 230 240V UNITS ONLY Littelfuse 218P 250 PCB PCB XFMR GND REAR PCB MIDI JACK
17. ctors There two wires at P9 P10 BRN A set of three 3 wires at P6 P7 RED and P5 YEL A set of four 4 mains wires at P3 P4 BLK and P1 P2 WHT One 1 ground wire GRN at P5 Remove the two 2 Phillips head screws that mount the small rear panel MIDI AUX HEADPHONE PCB to the panel Remove all nine 9 knobs Note the four 4 knobs on the AMP SELECT FX SELECT KEY SELECT and LOOP SELECT encoders are dif ferent than the five 5 knobs on the potentiometers Keep them separated Re move the panel nut on the INPUT JACK Pull the small INPUT PCB down and out of the chassis hole Remove the nine 9 panels nuts and nine 9 flat washers on all the controls Remove the two 2 screws that attach the heat sink to the chassis Remove the five 5 screws and five 5 lock washers that attach the PCB to the chassis standoffs With the chassis facing up drop the PCB down until the control shafts clear the chassis and the slide it back and out from the chassis Note that there are two 2 flat washers on each of the 4 encoders shafts mentioned above so do not lose them To re move the heat sink remove the two 2 sets of screws shoulder washers insulating pads flat washers and nuts that secure U3 and U5 to the heat sink Last remove the one 1 screw and one 1 lock washer that holds the heat sink to the PCB PCB EXCHANGE POLICY Parts marked with a single asterisk in the Part Lists are not field replaceable If a
18. failure due to one of these components is detected please con tact the FMIC Customer Service Department to order the complete PCB Assembly Fender G DEC Jr This is the model name for warranty claims CIRCUIT DESCRIPTION This section provides concise information about new or unusual circuitry designs incorporated into this amplifier model The purpose is to aid the service technician by providing insight into the design areas most likely to become obstacles in troubleshooting Information is focused for its effective use while maintaining the security of Fender proprietary in formation wherever possible MAIN PCB ANALOG INPUTS OUTPUTS Op amp U8 B provides the high impedance instru ment input with 15db of gain Op amp U8 A is a configured as a three pole active filter The filtered output signal Lin drives the encoder portion of the CODEC U13 of the uDSP processing section of the amplifier Signal VQ2 is the D C reference voltage from the CODEC thus centering the output signal about this level U2 B is configured as a differential input amp recovering the signal after uDSP processing and conversion back to an analog signal in the decoder portion of the CODEC U13 The LOUT and LOUT signals are the input to the differential amp which acts as a three pole active low pass filter The output of U2 B is applied to a unity gain buffer amp U2 A which drives op amp U1 A U1 A is a unity gain buffer when no
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20. ital format for processing The processed output digital signal and it is then con verted back to analog format and sent to the power amplifier All analog controls LOOP Start Stop switch and headphone present status are read via the analog multiplexer U6 A The output of the multiplexer is read serially by the right channel of the CODEC and sent to the uDSP system Note Troubleshooting the uDSP system to com ponent level beyond verification of power supplies clock and data signals is NOT recom mended Fender MIDI System MIDI Input signals from the external MIDI INPUT Jack J4 are optically isolated via U22 and sent to the Rx line of the uDSP UART controller within U10 for processing When MIDI is selected on the LOOP Selector the MIDI signal being received is passed through to the Tx line of the uDSP UART and to the MIDI IN of the SAM2195 Dream Synthesizer chip 020 The SAMP2195 then plays MIDI sounds based on the commands being sent from the external MIDI Sequence source With internal LOOPS selected the external MIDI in put is ignored and MIDI IN signals are generated by the uDSP system under control of the LOOP SE LECT and KEY SELECT controls The rate is controlled by the TEMPO control Audio output from the SAM2195 Dream Synthesizer chip is mixed in at summing op amp U2 B via R50 R54 The audio output of U2 B is mixed in with the instrument post processed effects and amp types added and Auxiliary Input a
21. poration All specifications are subject to change without no tice This information and any copies produced electronically or otherwise must be surrendered upon demand of Fender amp Musical Instruments Corporation Parts marked with two asterisks indicate the required use of that specific part This is neces sary for RELIABILITY and SAFETY requirements DO NOT USE A SUBSTITUTE Fender The description codes used in the itemized Parts Lists are defined below 3 G DEC Jr This is the model name for warranty claims PARTS LIST CODES CAPACITOR CODES CAP AE CAP CA CAP CD CAP CR CAP MPF CAP MY CAP PFF RESISTOR RES CC RES CF RES FP RES MF RES RES WW Aluminum Electrolytic Ceramic Axial Ceramic Disk Ceramic Radial Metalized Polyester Film Mylar Polyester Film Foil CODES Carbon Comp Carbon Film Flame Proof Metal Film Metal Oxide Wire Wound HARDWARE BLX CR HWH M NI OHP PB PHP PHPS SMA SMB CODES Black Oxide Chrome Plated Hex Washer Head Machine Screw Nickel Plated Oval Head Phillips Particle Board Pan Head Phillips Pan Head Phillips Sems Sheet Metal A Point Sheet Metal Point Stainless Steel Thread Forming Zinc Plated Fender G DEC Jr This is the model name for warranty claims SPECIFICATIONS Model Name Release Number Part Numbers 120V 60Hz US 120V 60Hz US DS 240V 50Hz AUS DS 230V 50Hz UK DS 230V
22. udio at U2 A POWER SUPPLIES The power transformer secondary windings are con nected to the main PCB at P5 through P10 The 20VDC power supplies for the solid state power amplifier are derived from the red yellow red secondary of the power transformer via full bridge rectifiers D4 D5 and D2 D3 and main filter caps C14 and C8 The yellow center tap lead and the system s chassis connection are placed between these caps making this the system ground star The 12VDC power supplies for the op amps regulated down from the 20 VDC supplies through dropping resistors R13 14 and Zener Diodes D6 and 07 The 11 5VDC power supplies for the Digital circuitry is derived from the brown brown secondary of the power transformer via full bridge rectifiers D15 D16 D17 and D21 and filter caps C34 This raw supply is then regulated down to 5VDC by U5 7805 G DEC Jr This is the model name for warranty claims The 5VDC supply powers multiplexer U6 Front Panel LED drivers Q5 Q7 and the D C reference voltage string R41 R43 for the high low reference level for front panel potentiometers The 5 is regu lated down to 3 3v and 1 25V via U18 and U17 respectively The 3 3V and 1 25 V supply power to the uDSP system components and the MIDI I F components including the SAM2195 Dream Chip U20 and U22 MIDI input opto isolator Reset control ler U12 monitors the 5V supply and shuts down all ICs in the event of power loss USER
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