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PARTS EXCLUSIVE TO VERSION ONE OF THE GFA-5400
(VERSION WITHOUT STANDBY POWER SUPPLY AND LM 555 PROTECTION CIRCUITRY)
SCHEMATIC
ADCOM PART NUMBER
LOCATION
D605,D606
16000082
R615,R616
27004300
R621,R622
27004200
PJ1,PJ2
22001370
30001045
30001035
Q639,Q640
33002362
T1
24005400
* Note 1: Matched IRFP240 and IRFP9240. Due to manufacturing variations in the turn on voltage of
these devices, these parts must be replaced in matched sets of 3. If any one of the output devices fails,
all three must be replaced. For example, if Q616 fails in the right channel, then all 3 of the N-channel
IRFP240 devices must be replaced in that channel (Q616, Q618, Q620). When ordering these parts,
specify a matched set of 3. Failure to use matched devices will cause "current hogging" by one of the
output devices. Proper bias alignment will not be possible in this circumstance leading to incorrect and,
possibly, unreliable operation.
DESCRIPTION
DIODE
RESISTOR
RESISTOR
INPUT JACK, Board Mount
SPEAKER POST RED
SPEAKER POST BLACK
TRANSISTOR
POWER TRANSFORMER
5
8.2V ZENER
15K
10K
2SC2362
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