Adcom gfp-710 Service Manual

SERVICE MANUAL

STEREO

PREAMPLIFIER

GFP-710

TABLE OF CONTENTS

Introduction . . . . . . . . . . . . . . . . 1

Parts List . . . . . . . . . . . . . . . . . . 2

Voltage Conversion . . . . . . . . . . . 6

Specifications . . . . . . . . . . . . . . . 7

Chassis Layout . . . . . . . . . . . . . . .

PCB Layout . . . . . . . . . . . . . . . . .

Wiring Diagram . . . . . . . . . . . . . .

Schematic . . . . . . . . . . . . . . . . .

10 Timber Lane

Marlboro, NJ 07746

USA

Tel: [phone]

Fax: [phone]

Web: http://www.adcom.com

INTRODUCTION

This service manual is intended to assist trained and qualified technical personnel in verifying the
performance of, adjusting, and repairing the ADCOM GFP-710 preamplifier. The procedures described
here are not intended for persons unfamiliar with the appropriate safety and test procedures.

WARNING

THERE ARE POTENTIALLY LETHAL VOLTAGES WITHIN THE GFP-710 PREAMPLIFIER WHICH
WILL BE ACCESSIBLE ONCE ITS TOP COVER IS REMOVED. DO NOT ATTEMPT

FAMILIARIZATION, INSPECTION, OR ANY PROCEDURE WHATSOEVER UNLESS YOU HAVE
DISCONNECTED THE GFP-710 FROM THE WALL AC OUTLET OR OTHER SOURCE OF AC
POWER AND THE POWER-SUPPLY CAPACITORS ARE COMPLETELY DISCHARGED. THESE
INSTRUCTIONS ARE PROVIDED FOR USE ONLY BY COMPETENT TECHNICAL PERSONNEL. DO
NOT UNDERTAKE ANY SERVICE PROCEDURES IN THE GFP-710 UNLESS YOU ARE
TECHNICALLY QUALIFIED TO DO SO.

GFP-710 SERVICE PARTS LIST

1

MAIN PCB AF78115

SCHEMATIC ADCOM PART NUMBER DESCRIPTION
LOCATION

JK101 22001400 4P GOLD RCA JACK
JK105 22001400 4P GOLD RCA JACK
JK102-104 22001090 4P RCA JACK
DN101 22001050 5P DIN JACK
VR1 35001030 Balance Pot
VR3,VR4 35001010 Bass, Treble Pot
C903,C904 12002230 Capacitor Ceramic 0.01uF 500V
C918 12002230 Capacitor Ceramic 0.01uF 500V
C101 12002010 Capacitor Ceramic 0.047uF 50V
C103 12002010 Capacitor Ceramic 0.047uF 50V
C108,C109 12002010 Capacitor Ceramic 0.047uF 50V
C111 12002010 Capacitor Ceramic 0.047uF 50V
C106,C107 12002150 Capacitor Ceramic 22pF 50V
C301,C302 12005240 Capacitor Elec .33uF 50V
C911 12005010 Capacitor Elec 1000uF 25V
C914,C915 12005010 Capacitor Elec 1000uF 25V
C901 12005070 Capacitor Elec 1000uF 35V
C110 12005020 Capacitor Elec 100uF 25V
C104,C105 12005100 Capacitor Elec 10uF 50V
C112 12005100 Capacitor Elec 10uF 50V
C205,C206 12005030 Capacitor Elec 2200uF 16V
C217,C218 12005050 Capacitor Elec 470uF 35V
C303,C304 12005050 Capacitor Elec 470uF 35V
C407,C408 12005050 Capacitor Elec 470uF 35V
C912,C913 12005050 Capacitor Elec 470uF 35V
C907,C908 12005000 Capacitor Elec 6800uF 50V
C902 12005130 Capacitor Elec 220uF 25V
C215,C216 12001625 Capacitor Layer .68uF 50V
C405,C406 12001625 Capacitor Layer .68uF 50V
C909,C910 12001015 Capacitor Layer 0.33uF 50V
C203,C204 12001010 Capacitor M.P. 4.7uF 100V
C511, C512 12001010 Capacitor M.P. 4.7uF 100V
C102 12001080 Capacitor Mylar .22uF 50V
C507-C510 12004020 Capacitor P.P. 0.0047uF 50V
C501-C504 12004030 Capacitor P.P. 0.056uF 50V
C201,C202 12004050 Capacitor P.P. 100pF 100V
C207,C208 12003305 Capacitor P.P. 10pF 100V
C211, C212 12003710 Capacitor P.P. 150pF 63V
C209,C210 12003295 Capacitor P.P. 33pF 63V
C213,C214 12003300 Capacitor P.P. 47pF 63V
C601,C602 12001515 Capacitor Poly 100pF 160V
C505,C506 12001535 Capacitor Poly 47pF 160V
C403,C404 12001535 Capacitor Poly 47pF 16V
C401,C402 12003165 Capacitor Styrol 33pF 125V
X101 44000710 Ceramic Resonator
D901-908 16004003 Diode 1N4003
D101-108 16004148 Diode 1N4148
D911

SCHEMATIC ADCOM PART NUMBER DESCRIPTION

16004148 Diode 1N4148

2