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Owner's 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: 732-683-2356
Fax: 732-683-9790
Web: http://www.adcom.com
INTRODUCTION
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Summary of Contents for Adcom GFP-710
- Page 1 SERVICE MANUAL STEREO PREAMPLIFIER GFP-710 TABLE OF CONTENTS Introduction ....1 Parts List ....2 Voltage Conversion .
- Page 2 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.
- Page 3 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 35001030 Balance Pot VR3,VR4 35001010 Bass, Treble Pot C903,C904...
- Page 4 LOCATION D915-D917 16004148 Diode 1N4148 D909,D910 16005550 Diode J555 D912 16002222 Diode LM329DZ IC102 21007100 0AD 87C750 IC105,IC106 21008000 LT-1028CN8 IC601 21004556 NJM4556D IC901 21007900 NJM7805FA IC903 21007815 NJM7815FA IC902 21007915 NJM7915FA IC107-IC110 21000604 OPA604AP IC103 21007457 TC74HC573N IC104 21007404 TC74HCU04AP JK106,JK107 22001570...
- Page 5 SCHEMATIC ADCOM PART NUMBER DESCRIPTION LOCATION R104 27002095 Resistor Roed 2.2K R413,R414 27002095 Resistor Roed 2.2K R405,R406 27002710 Resistor Roed 2.49K R217 27002340 Resistor Roed 2.4K R209,R210 27002080 Resistor Roed 215K R132 27002100 Resistor Roed R407,408 27002100 Resistor Roed R513,R514...
- Page 6 R121-R127 27002360 Resistor Roed IR RECIEVER PCB TX706524 SCHEMATIC ADCOM PART NUMBER DESCRIPTION LOCATION C101 12005020 Capacitor Elec 100uF 25V IC101 21000710 Remote Reciever POWER SWITCH PCB TX706534 SCHEMATIC ADCOM PART NUMBER DESCRIPTION LOCATION JK108 22001030 Head Phone Jack 37000710...
- Page 7 11001160 Tact Button Connector 13001040 Top Cover...
- Page 8 GFP-710 VOLTAGE CONVERSION 115V TO 230V 1. The multivoltage GFP-710 units have a detachable power cord and no rear panel AC outlets. 2. Unplug the unit and remove the top cover. 3. On the AC primary board mounted at the far left of the unit, unsolder the jumper at the 115V position and move it to the 230V position.
- Page 9 GFP-710 SPECIFICATIONS Output Impedence Bypass Output ................................100 ohms Main outputs................................100 ohms Tape Out ..................................475 ohms Output Level (Rated) Bypass Output ..................................2.0V Main Outputs..................................2.0V Output Level (Maximum) Bypass Output ................................≥ 10.0V Main Outputs.................................. ≥ 10.0V Frequency Response (+0.5 db) High Level................................
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