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)