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Fender PRINCETON 112 PLUS Service Manual
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Fender PRINCETON 112 PLUS Service Manual

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PRINCETON 112 PLUS
SERVICE MANUAL
Fender Musical Instruments Corp.7975 North Hayden Road Scottsdale, AZ 85258
p/n 022-6704-010 (120V)
CONTENTS:
Notices
Specifications
Therory of operation
Parts lists:
PCB Assembly
Chassis assembly
Footswitch assembly
Cabinet assembly
Miscellaneous
Schematics
Service diagram
1
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 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 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 as
follows:
CAPACITOR CODES
CAP AE
=
Aluminum Electrolytic
CAP CA
=
Ceramic Axial
CAP CD
=
Ceramic Disk
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 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

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Summary of Contents for Fender PRINCETON 112 PLUS

  • Page 1: Important Notice

    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.

  • Page 2: Specifications

    SPECIFICATIONS THEORY OF OPERATION Part Number: 022-6704-010 (120V) 022-6734-010 (240V Australia) PREAMP 022-6744-010 (230V UK) 022-6764-010 (230V) Input jack J1 contains the switching circuit for the inhibit function of the 4053 CMOS switch 022-6774-010 (100V) (U7). Without a plug inserted into J1 -8Vdc is available to pin 6 of U7A. This inhibits the CMOS switch from functioning, effectively muting the preamp.

  • Page 3: Parts List

    DESIGNATION The A.C. voltage from the power transformer secondary is tapped off through dropping resistor 048523001 PCB ASSY PRINCETON 112 PLUS R73, and presented to the footswitch jack (Approx 20 V R.M.S.). By rectifying the positive or 028104 BUTTON PUSH SWITCH BLACK (@ S1 DRIVE SELECT) negative side of the waveform, we create a D.C.
  • Page 4 PARTS LIST PARTS LIST PRINTED CIRCUIT BOARD ASSEMBLY PRINTED CIRCUIT BOARD ASSEMBLY CONTINUED CONTINUED QTY PART # DESCRIPTION REFERENCE DESIGNATION QTY PART # DESCRIPTION REFERENCE DESIGNATION 020789 FUSE QA 20mmX5mm 250V 1AMP F1(220V/230V/240V ONLY) 025074 RES CF 1/4w 1.8M 028497 HEATSINK PLATE (TRANSISTOR MOUNT) 037169...
  • Page 5 (HANDLE MOUNT) 028591 NUT ACORN 8-32 (TRANSFORMER MOUNT) 028055 REVERB UNIT 800 ohm 8EB2C1B DN (PAN) 048844 PANEL FRONT PRINCETON 112 PLUS 026571 SCRW CORNER MOUNTING 048525 PANEL REAR PRINCETON 112 PLUS 022244 SCRW M 10-32x1-1/8 OHP NI (HANDLE MOUNT)