Fender 68 Custom Princeton Reverb User manual

‘68 Custom Princeton®Reverb
(This is the model name for warranty claims)
Fender Musical Instruments Corporation, 17600 North Perimeter Drive, Suite 100 Scottsdale, AZ 85255
Issued: October, 2013
p/n 227-2000-000 (120V)
SERVICE MANUAL
ATTENTION:
WARRANTY SERVICE PROCEDURES
The ‘68 Custom Princeton®Reverb Amplifier is considered to be field serviceable to the
component level. As such stuffed PCB Assemblies are not readily available for this unit.
Any Fender Authorized Service Center in need of a warranty replacement PCBAssembly
for this unit, should contact the Fender Customer Service Call Center, and ask to speak to
an Electronic Technician. You will be given instructions on how to proceed with the repair at
that time. You can reach the Call Center by phone at [phone] or by email at
[e-mail].

‘68 Custom Princeton®Reverb
(This is the model name for warranty claims)
2
IMPORTANT NOTICE
Copyright © 2013 FMIC. All rights reserved. All
information contained herein is CONFIDENTIAL
and PROPRIETARY and is the property of Fend-
er® Musical Instruments Corporation. It is not to
be sold or assigned to another party and is dis-
closed 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® Musical Instruments Corporation. 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® 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
CAPAE = Aluminum Electrolytic
CAP CA = Ceramic Axial
CAP CD = Ceramic Disk
CAP CR = Ceramic Radial
CAP MPF = Metalized Polyester Film
CAP MY = Mylar
CAP PFF = Polyester Film/Foil
RESISTOR CODES
RES CC = Carbon Comp
RES CF = Carbon Film
RES FP = Flame Proof
RES MF = Metal Film
RES MOX = Metal Oxide
RES WW = Wire Wound
HARDWARE CODES
BLX = Black Oxide
CR = Chrome Plated
HWH = Hex Washer Head
M = Machine Screw
NI = Nickel Plated
OHP = Oval Head Phillips
PB = Particle Board
PHP = Pan Head Phillips
PHPS = Pan Head Phillips Sems
SMA = Sheet Metal "A" Point
SMB = Sheet Metal "B" Point
SS = Stainless Steel
TF = Thread Forming
ZI = Zinc Plated

‘68 Custom Princeton®Reverb
(This is the model name for warranty claims)
3
SPECIFICATIONS
Model Name: 68 Custom Princeton Reverb
Release Number: PR 722
Part Numbers 68 CUSTOM PRINCETON REVERB 120V 227-2000-000
68 CUSTOM PRINCETON REVERB 110V TW 227-2001-000
68 CUSTOM PRINCETON REVERB 240V AUS 227-2003-000
68 CUSTOM PRINCETON REVERB 230V UK 227-2004-000
68 CUSTOM PRINCETON REVERB 230V ARG 227-2005-000
68 CUSTOM PRINCETON REVERB 230V EUR 227-2006-000
68 CUSTOM PRINCETON REVERB 100V JP 227-2007-000
68 CUSTOM PRINCETON REVERB 220V ROK 227-2009-000
Power Requirement: 125 W
Fuses: F 2A, 250V for 100V versions
F 2A, 250V for 120V versions
F 1.25A, 250V for 230V versions
F 1.25A, 250V for 240V versions
Input Sensitivity:
Input 1 High Level 11 mV –volume at maximum for 12 watts power. Tone controls centered.
Input 2 Low Level 22 mV –volume at maximum for 12 watts power. Tone controls centered.
Power Output: 12W RMS into 8 ohms @ < 10%THD, 1000Hz
Input Impedances >1M Ohms
Speaker Complement: 10” , 8 ohm
Dimensions Height: 16 in (40.6 cm)
Width: 19 7/8 in (50.5 cm)
Depth: 9 1/2 in (24.1 cm)
Weight: 34 lbs (15.7 kg)
Product specifications are subject to change without notice

‘68 Custom Princeton®Reverb
(This is the model name for warranty claims)
4
SERVICE NOTES
CHASSIS REMOVAL is accomplished by first re-
moving the four (4) screws from the rear upper
panel. Unplug the white and red plugs on the Re-
verb cable from the Reverb Input and Output
respectively and also the Internal Speaker Output
cable. Now remove the two screws (4 total) screws
on the left and right nickel plated chassis straps on
the cabinet top. Pull the screws completely out of
the cabinet. The chassis can now slide out to the
rear, giving access to the electronics.
POLICY PCB EXCHANGE
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 or-
der 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.
PRE-AMPLIFIER/REVERB
The guitar signal is input to J1 for high gain and J2
for lower gain. When both inputs are used, both
signals receive low gain. V1-A provides a single
gain stage that drives the tone stack. The tone
stack composed of R54 and R55 and associated
components provide treble and bass tone control
respectively. R53 provides volume control. V1-B
provides gain lost in the tone stack. The output from
V1-B is fed via C3, creating a high pass response to
the REVERB drive amplifier V2. The REVERB pan
is driven by impedance matching transformer T3.
The signal is also coupled to the V3-B intermediate
gain stage which acts as a mixer of the clean signal
and the recovered reverb signal from the REVERB
recovery amplifier V3-A.
TREMELO
V4-A is an R-C phase shift oscillator with the phase
shift network provided by (R21+R11)/C6, C21/R15
and C20/R16. The oscillator rate is controlled by
SPEED control R21 in the first leg of the phase shift
network. The rate is approximately from 0.5 Hz to 5
Hz. The output of the oscillator is applied through
the INTENSITY control R24 which injects a modu-
lating signal on top of the negative D.C. grid bias of
the output push-pull amplifier tubes (V5 & V6). The
variation of the bias point by the signal varies the
gain of the output stage at the TREMELO rate cre-
ating an amplitude modulated vibrato effect.
POWER AMPLIFIER
Phase splitter V4-B is driven by V3-B. Output from
the phase splitter drives the upper power amp tube
V5 from the plate of V4-B and the lower power tube
V6 from the cathode of V4-B. V5 and V6 act as a
push-pull pair in a class A-B power amplifier. T1
matches the 6L6 plate impedance to the speaker
load.

‘68 Custom Princeton®Reverb
(This is the model name for warranty claims)
5
POWER SUPPLY
The line voltage is fed to T2’s primary through the
line fuse, F1, and the inrush current limiter, RT1.
The input voltage is then stepped up or down as
needed, full-wave rectified by dual vacuum tube di-
ode V7 and filtered to produce the 440V, 425V, and
260V B+ voltages for the tubes. Solid state diodes
D6 and D8 will allow the amp to continue to work
even if a short exists across the vacuum tube V7
diode. A 6.3VAC secondary powers the power indi-
cator lamp and the preamp & power amp tubes’
heaters. The rectifier diode filament is supplied by
a separate 5.4 VAC secondary winding.
Bias for the output tubes is supplied by the solid
state half-wave rectifier D7, a resistive divider circuit
(R28, R22 and R2), and filter capacitor C25. R22 is
used to adjust the output tube stage bias voltage to
set the idle current at 23 mA (23 mV across R20 or
R32).

‘68 Custom Princeton®Reverb
(This is the model name for warranty claims)
*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.
6
PARTS LIST: PCB ASSEMBLY
QTY.
PART #
DESCRIPTION
REFERENCE DESIGNATION
1
0027627001
RES FILM 1W 5% 10ohm LL
R60
5
0027353001
RES FILM 1W 5% 100k LL
R5 R28 R36-37 R45
1
0027347001
RES FILM 1W 5% 2.2k LL
R31
1
0037664001
**RES MOX FP 1W 5% 1k LL
R58
2
0075909000
**RES MOX FP 1W 5% 18k LL
R57 R59
2
0033095001
**RES MOX FP 1W 5% 1ohm LL
R20 R32
2
0028021001
**RES MOX 2W 5% 470ohm LL
R39-40
2
0026368001
RES CF 1/2W 5% 100ohm LL
R1 R3
1
0027871001
RES CF 1/2W 5% 1k LL
R27
2
0025116001
RES CF 1/2W 5% 100k LL
R11 R46
6
0053869001
RES CF 1/2W 5% 1M LL
R6 R14-16 R25 R30
6
0026549001
RES CF 1/2W 5% 1.5k LL
R4 R8 R23 R29 R33 R44
4
0025117001
RES CF 1/2W 5% 220k LL
R12 R18-19 R38
1
0041272001
RES CF 1/2W 5% 5.6k LL
R10
1
0037665001
RES CF 1/2W 5% 27k LL
R2
1
0028861001
RES CF 1/2W 5% 3.3k LL
R9
1
0025109001
RES CF 1/2W 5% 47ohm LL
R7
2
0047434001
RES CF 1/2W 5% 56k LL
R17 R26
1
0036955001
RES CF 1/2W 5% 6.8k LL
R52
1
0024981001
RES CF 1/4W 5% 10k LL
R50
1
0025069001
RES CF 1/4W 5% 1M LL
R48
1
0025077001
RES CF 1/4W 5% 3.3M LL
R13
2
0024995001
RES CF 1/4W 5% 68k LL
R47 R51
1
0024986001
RES CF 1/4W 5% 18k LL
R34 (MANUALLY INSTALLED)
1
0028503000
**THERMISTOR 10 ohm 5A C60-11
RT1
1
0037600000
CONTROL SNAPIN 100k B TAPER
R56
1
0037596000
CONTROL SNAPIN 1M 30A TAPER
R53
1
0047540000
CONTROL SNAPIN 250k 15A TAPER
R55
2
0037597000
CONTROL SNAPIN 250k 30A TAPER
R24 R54
1
0037601000
CONTROL SNAPIN 3M 10C TAPER
R21
1
0053860000
**CAP MPF .1uF 250VAC 20%
C17
2
0051406003
CAP CD 220pF 500V 10%
C11 C15 C30-31
1
0020883000
CAP CD 10pF 1000V 10%
C5
1
0020917000
CAP CD 250pF 1000V 10%
C19
1
0020842000
CAP CD 500pF 1000V 10%
C3
1
0037040002
CAP PFF .0033uF 400V 10%
C13
6
0009512001
CAP AE AX 22uF 25V 20%
C1-2 C7-9 C18
4
0024819000
**CAP AE AX 22uF 500V +50%-10%
C26-29
1
0031040000
CAP AE RDL 100uF 100V 20%
C25
2
0024823000
CAP MPF RDL .01uF 400V 10%
C20-21
5
0024833000
CAP MPF RDL .022uF 400V 10%
C4 C6 C12 C14 C23
1
0024854000
CAP MPF RDL .1uF 400V 10%
C24
1
0024855000
CAP MPF RDL .1uF 630V 10%
C22
2
0024835000
CAP MPF RDL .22uF 630V 10%
C10 C16
2
0064089001
DIODE 1N4003
D1 D5
1
0057351001
**DIODE BYD33V
D7
2
0029690001
**DIODE HV 3kV 200mA
D2-3

‘68 Custom Princeton®Reverb
(This is the model name for warranty claims)
*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.
7
QTY.
PART #
DESCRIPTION
REFERENCE DESIGNATION
1
0047206000
DIODE ZEN 1N5370B 56V 5W 5%
D4
7
0026000001
FSTN TAB MALE .187x.032 PCB MT
P3-6 P12-14
8
0025802000
FSTN TAB MALE .250x.032 PCB MT
P1 P2 P7-11 P17
2
0027408000
HDR .1 CTR 2 CKT SQ PIN
P19A/B
6
0027413000
HDR .1 CTR 6 CKT SQ PIN
P15A/B, P16A/B, P17A/B
2
0059889000
JACK STEREO R/A w/METAL BUSH
J1-2
2
0070334001
**FUSE PICO 7 AMP 125V
F2,F3
PARTS LIST: CHASSIS ASSEMBLY
QTY.
PART #
DESCRIPTION
REFERENCE DESIGNATION
1
0098970000
*PANEL FRONT 68 PRNCTN
1
0075165000
**XFMR 65 PRINCETON REVERB 120V
T2
REF
0075166000
**XFMR 65 PRINCETON REVERB 100V
T2
REF
0075167000
**XFMR 65 PRINCETON REVERB 220/240V
T2
1
0036702000
**FUSE HOLDER 3AG FINGER GRIP
@100/120 VAC VERSIONS
1
0048827000
**FUSE QA 1-1/4x1/4 250v 2A
F1, 100/120 VAC VERSIONS
REF
0036703000
**FUSE HOLDER 5MM FINGER GRIP
@230/240 VAC VERSIONS
REF
0048382000
**FUSE QA 20mm X 5mm 250V 1.25A
F1, 230/240 VAC VERSIONS
6
0022004000
NUT KEPS 8-32 ZINC
1
0037099000
**XFMR REVERB VIBROVERB/65 DLX
T3
1
0069362000
**XFMR OUTPUT PRA
T1
3
0990724000
TUBE SCKT 8 PIN
@V5,V6,V7
18
0038900000
SCRW TF 6-32X1/4 PHP ZI
4
0023606000
TUBE SOCKET 9 PIN
@V1-V4
3
0020424000
TUBE RING UNIVERSAL (277H-2)
@V5,V6,V7
2
0037239000
SCRW TF 8-32x3/8 PHP BLX
3
0018022000
BUSHING SNAP 5/16x17/32 BLK
3
5550112391
TUBE 7025/12AX7A ECC83S GT-ECC83-S
V1, V3, v4
1
5550112400
TUBE 12AT7 ECC81S GT-ECC81-S
V2
1
5550113960
TUBE 5AR4 FULLWAVE RECTIFIER
V7
1
5550113539
TUBE 6V6 GTA 6V6S MATCHED DUET MED
V5, V6 - note: Duet (Matched)
4
0990723000
TUBE SHIELD
@V1-V4
6
0016352049
NUT HEX 3/8-32x3/32 TK NI
Sold in 12 pack
REF
0031153049
WSHR FLAT 3/8x.614 NI
Sold in 12 pack
1
0054642000
**CONNECTOR IEC SNAP IN
1
0036570000
**SWITCH TOGGLE DPST W/NUTS
S1, MAIN POWER SWITCH
1
0021956000
JACK PHONE OPEN CIRCUIT 11
J9, EXTERNAL SPEAKER
2
0056930000
JACK PHONO 2 CND PNL MT #3501FP
J3, J4 REVERB IN/OUT
1
0013043000
JACK PHONE STEREO 12B
J5, FOOTSWITCH (P/O CHS WIRESET)
1
0021550000
JACK PHONE TIP SHUNT 12A
J8, SPEAKER
6
0990930000
KNOB BLK W/WHT STAMP 1-10
1
0054798000
JEWEL ASSY LED
1
0055033049
JEWEL PILOT LITE BLUE
1
0032219049
COLLAR-PILOT LIGHT
1
0021741049
HOLDER IDAL LITE ASSY PILOT
1
0021642049
PILOT LIGHT #T47

‘68 Custom Princeton®Reverb
(This is the model name for warranty claims)
*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.
8
PARTS LIST: CHASSIS ASSEMBLY
QTY.
PART #
DESCRIPTION
REFERENCE DESIGNATION
1
0031625000
NUT HOLDER PILOT LIGHT 11/16-27
10
0028937000
SCRW TF 6-32x5/8 PHP ZI
REF
9904300920
WASHER FLAT .482X.709 NI
6
0022012049
NUT HEX 3/8-32x3/32 TK NI
Sold in 12 Pack
2
0057351001
**DIODE 1400V 1.3A #BYD33V/EBT/R
1
0017502000
CONTROL T-POT 10k 20% CHASSISMTG
R22, BIAS ADJUST
10
0025936000
STANDOFF NYL PCB SNAP 3/8
@PCB MOUNTING HOLES
4
0051406003
CAP CD 220pF 500V 10%
C11,C12,C30,C31 @ J3, J4, J5
3
0070998000
CABLE ASSY RIBBON 6CKT 2-1/2"
1
0076040000
CABLE ASSY RIBBON 2CKT 2-1/2"
PARTS LIST: CABINET ASSEMBLY
QTY.
PART #
DESCRIPTION
REFERENCE DESIGNATION
1
0098987000
*CAB ASSY 68 PRNCTN
1
0098987001
*68 PRNCTN CABINET GRILLE BAFFLE ASSY
1
0098987002
*68 PRNCTN CABINET UPPER BACK ASSY
1
0098987003
*68 PRNCTN CABINET LOWER BACK ASSY
1.3 yd
0026570000
TOLEX "BRAVURA BLACK" BRONCO
8
0029527049
WSHR FNSH 8-5/8 FLNGD BLX WX
Sold in 12 pack
8
0011678000
SCRW SMA 8x1-1/2 OHP BLX
6
0021972049
NUT T 10-32x3/4 STR 3 PRNG BLX
Sold in 12 pack
2
0022244000
SCRW M 10-32x1-1/8 OHP NI
2
0025395000
HANDLE CAP 1 HOLE NI(DWG17420)
1
0037790000
HANDLE VINYL BLACK MATTE 9.25" RIBBED
1
0032524000
HANDLE REINFORCEMENT STEEL
4
0041549000
GLIDE CUP PRESS-IN NI PLATED (0.75 DIA)
0.2
0098990000
CLOTH GRILLE BLACK/SILVER/BLUE
PARTS LIST: END ITEM ASSEMBLY
QTY.
PART #
DESCRIPTION
REFERENCE DESIGNATION
1
0098987000
*CAB ASSY 68 PRNCTN
1
0053997000
**CORD PWR W/IEC CONN 100V JPN
1
0047251000
**CORD PWR W/IEC CONN 230V
1
0057674000
**CORD PWR W/IEC CONN 230V ARG
1
0047249000
**CORD PWR W/IEC CONN 230V UK
1
0047250000
**CORD PWR W/IEC CONN 250V
1
0047248000
**CORD PWR W/IEC CONN DOM
1
0037211000
FOOTSWITCH ASSY VIB/REV
1
0075947000
COVER 65 PRINCETON REVERB
2
0990910000
STRAP CHASSIS 4-1/2" NICKEL
4
0022236049
SCRW M 8-32x3-1/4 OHP NI CP
@CHASSIS MTG Sold in 12 pack
1
0022491000
CLAMP CABLE NYL SCRW MNT 5/16
@REVERB CABLE
1
0029828049
SCRW PB 8x3/4 PHP ZI
@ REVERB CABLE CLAMP

‘68 Custom Princeton®Reverb
(This is the model name for warranty claims)
*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.
9
PARTS LIST: END ITEM ASSEMBLY
QTY.
PART #
DESCRIPTION
REFERENCE DESIGNATION
1
0056931000
CABLE REVERB 48" RIGHT ANGLE
1
0064063000
REVERB UNIT 4 SPRING 4AB3C1B
1
0031849000
REVERB BAG
1
0028453000
PAD CARDBOARD REVERB #12FN86
1
0023192000
*NAMEPLATE FNDR 65 TWIN
3
0037985049
SCRW SMA 2x3/8 PHP BLX
@ FENDER NAMEPLATE Sold in 12 pack
8
0037215049
WSHR C/SUNK NICKEL #6
@REAR PANELS Sold in 12 pack
8
0037952049
SCRW SMA #6x1 OHP Ni
@REAR PANELS Sold in 12 pack
1
0038566000
CABLE ASSY SPKR RT ANG 13-1/2"
4
0047821000
SCRW M 10-32 3/4 THP STL BLX
1
7700223000
SPEAKER 10" 8 OHM 30W T5814AX96
1
0075329000
**TUBE CAGE 65 PRINCETON REVERB
ALL MODELS
4
0016006000
SCRW M 10-32x1/2 THP NI
TUBE CAGE MOUNTING
PARTS LIST: FOOTSWITCH ASSY
QTY.
PART #
DESCRIPTION
REFERENCE DESIGNATION
1
0994058000
FOOTSWITCH ASSEMBLY VIB/REV
1
0013172000
PLUG PHONE 3 CONDUCTOR 238 RA
2
0024042000
SWITCH SPST PUSH BUTTON

‘68 Custom Princeton®Reverb
(This is the model name for warranty claims)
10
Service Diagram List
Service Diagram (Schematic)….…..68 CUSTOM PRINCETON REVERB PCB
Service Diagram (PCB Assembly)...68 CUSTOM PRINCETON REVERB PCB