Adcom gfp 750 service manual

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adcom gfp 750 service manual

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Page 1

SERVICE MANUAL

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PREAMPLIFIER

GFP-750

TABLE OF CONTENTS
Specifications ................. 1
Parts List ..................... 2
Schematic .................... 5
Board View ................... 9
Semiconductors ............... 10
Circuit Description .............. 10
Voltage Conversion ............ 12
Service Bulletin ................ 13

M

10 Timber Lane
Marlboro, NJ 07746
USA
Tel: 732-683-2356
Fax: 732-683-9790

Web: http://www.adcom.com

Page 2

MSW-750 Specifications

Output Level (Rated) 1.0V

THD+N @ Rated Output (20Hz to 20kHz)
Balanced .................................... 50.02576
Unbalanced ................................... 50.095%

THD+N @ Rated Output (1kHz)
Balanced ...................................... $001526
Unbalanced .................................... 50.017%

Output Impedance

Balanced ...................................... <1200f2

Unbalanced ................................... <6009
Input Impedance

Balanced ...................................... 94k!)

Unbalanced .................................... 47km
Frequency Response (Balanced and Unbalanced)

20Hz to 20kHz .................................. +0. «0.25dB
IM Distortions (@Fiated Output)

CCIF from 4kHz to 20kHz (Balanced) .................... 9.009%

CCIF from 4kHz to 20kHz (Unbalanced) ................... so.035%

SMPTE (Balanced) ................................ £0.05%

SMPTE (Unbalanced) .............................. 50.05%
Signal to Noise Ratio (Ref. To 1 volt)

-A" Weighted (Balanced) ............................ 2102dB

-A" Weighted (Unbalanced) ........................... 2102dB
Input Sensitivity (@ Rated Output)

Balanced ...................................... 183mV

Unbalanced .................................... 365mV

GENERAL SPECIFICATIONS

Power (available in 230V by special order.) .................... 115VAc-50/60Hz
Power Consumption ............................................ aoVA
Chassis Dimensions .................... 3 1/2" (89mm) x 17" (432mm) x 11" (279mm)
Maximum Dimensions .................. 4 1/8" (105mm) x 17" (432mm) x 12" (305mm)
Weight .................................................. 15lbs. (6.8kg)
Weight, Packed ........................................... 17 lbs. (7.7kg)