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SUPER CHAMP

®

 XD

 

(This is the model name for warranty claims) 

 

5

 
 

PCB EXCHANGE POLICY 

 
Parts marked with a single asterisk (

*

) in the Part 

Lists are not field replaceable.  If a failure due to 
one of these components is detected, please con-

tact the FMIC Customer Service Department to 
order the complete PCB Assembly. 

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 

The main PCB contains the circuitry for the pre-
amplifier, the power amplifier and the power supply. 
The controls are located on a breakaway section of 
the main PCB with ribbon cables connecting them. 

PRE-AMPLIFIER  

Op-amp U7-A provides the high impedance instru-
ment input with 15db of gain.  Op-amp U7-B is 
configured as a three pole active filter.  The filtered 
output signal (Lin) drives the encoder portion of the 
CODEC U13 of the uDSP PCB.  Signal VQ2 is the 
D.C. reference voltage from the CODEC thus center-
ing the output signal about this level.    Op-amp U3-A 
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 U3-A is ap-
plied to a  buffer amp U1-A which drives op-amp U1-
B which provides the LINE OUT signal and the 
power amp input. FET Q1 provides system muting 
during power up/down in conjunction with the power 
sense circuits comprised of D9, Q2 and Q4. 

 

USER INTERFACE 

The 4 - 16 position encoders (S2 –S3) for the VOICE 
and EFFECT SELECT are read via the port ex-
pander U4 and the data sent to the uDSP system via 
the I

2

C interface lines SCL and SDA.  

 
The 6 potentiometers CH1 VOLUME (R85), CH2 
VOLUME (R83), CH2 GAIN (R84), TREBLE (R82), 
BASS (R81) and FX LEVEL (R80) generate DC volt-
ages (+1.0V to +4.0V) that are read by the analog 
multiplexer U6. IO0-IO3 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 uDSP system reads the state of these 
controls and inputs digitally from the CODEC.  
 

POWER AMPLIFIER  

The power amplifier consists of V1, V2, V3, T2 and 
associated circuitry. The signal is fed to the gate of 
V1-B in common cathode configuration. The signal 
is then fed from the plate of V1-B to the gate of V1-
A which is operating as a phase splitter which 
drives V2 from its plate and V3 from its cathode. V2 
and V3 are operating in class A-B push-pull mode. 
T2 matches the impedance of V2’s plate to the 8 
Ohm speaker. Negative feedback is provided by 
R23 feeding signal back to V1-B’s cathode. 

uDSP PCB  

The uDSP PCB is located in the back of the chassis 
opposite the power transformer. It provides the am-
plifier voicing and effects functions. The uDSP PCB 
is not field serviceable and must be replaced as an 
assembly. 

 
 

Summary of Contents for Super Champ-XD

Page 1: ...r or Service Center in possession of a defective Super Champ XD with a warrantable defect other than failed tubes should contact the Fender Customer Service Support Center to arrange for a re placement amplifier The Support Center can be reached at 800 345 3642 or by email at service fender com THIS TECHNICAL DATA PROVIDED FOR NON WARRANTY REPAIRS ONLY Fender Musical Instruments Corporation 8860 E...

Page 2: ...emand of Fender 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 PARTS LIST CODES The description codes used in the itemized Parts Lists are defined below CAPACITOR CODES CAP AE Aluminum Electrolytic CAP CA Ceramic Axial CAP CD Ceramic Disk CAP CR Cerami...

Page 3: ...R 2331106900 100V 50Hz JPN 2331107900 Power Requirement 90 W Power Output 20 W RMS into 8 ohms 5 THD Power Amp Sensitivity 50mV for 20 W into 8 ohms 5 THD Impedances Input Pre Amp 1M Ohms Line Out 1 kOhm Speaker Complement Fender Special Design 8 ohm 10 P N 0073858000 Dimensions Height 15 0 in 38 cm Width 17 5 in 45 cm Depth 9 0 in 22 9 cm Weight 24 lbs 10 9 kg Product specifications are subject t...

Page 4: ...ine out jack nut and the two screws that hold the chassis rear panel to the chassis Remove the rear panel and the vacuum tubes Disconnect the ribbon cable that goes between the main PCB and the uDSP PCB Remove all screws holding the main PCB to the stand offs on the chassis Then remove the front panel knobs and the nuts holding the controls to the front panel Slide the front panel PCB back away fr...

Page 5: ...e the input to the differential amp which acts as a three pole active low pass filter The output of U3 A is ap plied to a buffer amp U1 A which drives op amp U1 B which provides the LINE OUT signal and the power amp input FET Q1 provides system muting during power up down in conjunction with the power sense circuits comprised of D9 Q2 and Q4 USER INTERFACE The 4 16 position encoders S2 S3 for the ...

Page 6: ...VDC for the digital circuitry on the main PCB and fed to the uDSP PCB where it is regulated to 3 3 VDC and fed back on to the main PCB Similarly the center tapped orange and yellow winding is rectified fil tered and fed to 12V zeners to provide power to the operational amplifiers and other circuitry The red windings provide the high voltage for the vac uum tubes The green winding provides 6 3VAC f...

Page 7: ...7278003 CAP MPF 1uF 63V 10 C52 C63 1 0024833000 CAP MPF RDL 022uF 400V 10 C20 3 0024855000 CAP MPF RDL 1uF 630V 10 C5 6 C61 6 0033578003 CAP PFF RDL 001uF 100V 10 C30 33 C36 C44 6 0027941000 CONTROL SNAPIN 50k B TAPER R80 85 9 0064089001 DIODE 1N4003 D3 D26 30 D32 33 D36 6 0026730001 DIODE 1N4006 800V 1A D7 8 D12 15 13 0006260001 DIODE 1N4448 SIGNAL LL D4 6 D10 11 D18 25 2 0029690001 DIODE HV 3kV ...

Page 8: ... 1 0025084001 RES CF 1 4W 5 10M LL R45 8 0024981001 RES CF 1 4W 5 10k LL R5 R9 R18 19 R44 R54 R62 63 1 0029598001 RES CF 1 4W 5 110ohm LL R46 5 0024983001 RES CF 1 4W 5 12k LL R37 40 R67 3 0024985001 RES CF 1 4W 5 15k LL R7 R26 R36 2 0025069001 RES CF 1 4W 5 1M LL R43 R52 5 0024965001 RES CF 1 4W 5 1k LL R1 R35 R77 R89 90 1 0029600001 RES CF 1 4W 5 200ohm LL R66 2 0029006001 RES CF 1 4W 5 20k LL R...

Page 9: ...091000 SWITCH PUSH SLFLK SHORT STROKE S1 1 0994020002 DUET MATCHED 6V6GTA STR391A V2 3 1 0994024000 TUBE 7025 12AX7WA RUSSIAN V1 7 REF WIRE JUMPER WJ8 WJ1A WJ1B WJ2A WJ2B WJ3A WJ3B 1 REF WIRE JUMPER WJ6 1 0014689003 XSTR N CH JFET J111 TO 92 Q3 2 0016739003 XSTR NPN 2N4401 TO 92 Q4 5 2 0016742003 XSTR PNP 2N4403 TO 92 Q1 2 PARTS LIST MISCELLANOUS QTY PART DESCRIPTION REFERENCE DESIGNATION Non serv...

Page 10: ...M 1 6A FAST ACTING F2 230 240V UNITS 2 0057347000 KNOB ROTARY W CHROME INSERT FX SELECT VOICE 5 0054419000 KNOB ROTARY W CHROME INSERT VOLUME TONE 1 0073858000 SPEAKER 10 SUPER CHAMP XD 1 0074594000 PCB ASSY uDSP SUPER CHAMP XD 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 A...

Page 11: ...SUPER CHAMP XD This is the model name for warranty claims Service Diagram List Service Diagram Schematic SUPER CHAMP XD Service Diagram PCB Assembly SUPER CHAMP XD ...

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