Adcom GFA-5300 Service Manual

4
MAIN AND STANDBY POWER SUPPLY PCB
SCHMATIC ADCOM PART NUMBER DESCRIPTION
LOCATION
C201 12005700 SPARK KILLER 4700pF 400V
C202,C203 12005005 CAPACITOR ELEC 10000uF 63V
C204,C205 12001235 CAPACITOR MYLAR 0.1uF 250V
C206,C207 12005005 CAPACITOR ELEC 10000uF 63V
C208,C209 12001235 CAPACITOR MYLAR 0.1uF 250V
C210 12005010 CAPACITOR ELEC 1000uF 25V
C211 12005120 CAPACITOR ELEC 220uF 16V
D201,D202 16002504 BRIDGE RECTIFIER KPCB2504
D203-D207 16004003 DIODE 1N4003
D302 16001204 POWER LED LTL1204 (RED)
M207 37005200 POWER SWITCH SDDFA3066A
NR01 31005200 THERMISTOR 5R/8A
R201,R202 27003280 RESISTOR 8.2K 1W
R203,R204 27003300 RESISTOR 10R 2W
R205,R206 27003280 RESISTOR 8.2K 1W
R207 27001480 RESISTOR 5.6K 2W
U201 21007812 REGULATOR IC 7812
V201 EURO 12001610 VARISTOR TNR9G391K
V201 USA 12001230 VARISTOR TNR9G221K
OTHERS
SCHMATIC ADCOM PART NUMBER DESCRIPTION
LOCATION
T1 24005300 MAIN TRANSFORMER 1806-2116-2
T2 24005201 STANDBY TRANSFORMER 1806-2196-0
F201 EURO 19000315 MAIN FUSE 3.15A 250V
F201 USA 19000600 MAIN FUSE 6A 125V
M202 EURO 19009050 STANDBY FUSE T.5A 250V
M202 USA 19009050 STANDBY FUSE T.5A 250V
13005301 FRONT PANEL
13005300 TOP COVER
13005304 HEAT SINK
47002580 LED HOLDER
13005206 FOOT
15001050 POWER CHORD
11001155 POWER BUTTON
11001165 POWER BUTTON FRAME
20005300 MAIN FUSE HOLDER

Adcom GFA-5300 Specifications

Power

power rating into 8 ohms	80 watts continuous average power per channel
power rating into 4 ohms	125 watts continuous average power per channel
power consumption - quiescent	100 VA
power consumption - maximum	720 VA
power consumption - 80 watts into 8 ohms	510 VA
power consumption - 125 watts into 4 ohms	720 VA
power supply voltage	115 VAC - 50/60 Hz

Distortion and Noise

IM distortion SMPTE 8 ohms	≤ 0.07%
IM distortion SMPTE 4 ohms	≤ 0.07%
IM distortion CCIF 8 ohms	≤ 0.035%
IM distortion CCIF 4 ohms	≤ 0.035%
THD + Noise at 80 watts into 8 ohms 20Hz	0.018%
THD + Noise at 80 watts into 8 ohms 1kHz	0.02%
THD + Noise at 80 watts into 8 ohms 10kHz	0.07%
THD + Noise at 80 watts into 8 ohms 20kHz	0.14%
THD + Noise at 125 watts into 4 ohms 20Hz	0.018%
THD + Noise at 125 watts into 4 ohms 1kHz	0.02%
THD + Noise at 125 watts into 4 ohms 10kHz	0.08%
THD + Noise at 125 watts into 4 ohms 20kHz	0.165%
signal to noise ratio (A weighted)	≥ 100 dB

Frequency and Gain

frequency response	+0, -0.25 dB from 10Hz to 20kHz
power bandwidth	3Hz to 130kHz
dynamic headroom into 4 ohms	2.1 dB
gain	29 dB

Input and Output

input sensitivity for 1 watt	0.1 volts
input sensitivity for 80 watts	0.9 volts
input impedance	49.9 kΩ
damping factor	≥ 350
rise time	1.8 µS

Weight and Dimensions

chassis dimensions	4 1/2” x 17” x 11 3/8” (105mm x 432mm x 289mm)
maximum dimensions	4 3/8” x 17” x 12 1/8” (111mm x 432mm x 308mm)
weight	22 lb. (10.0 kg)
weight, packed	25 lb. (11.3 kg)