QSC ISA280 - Troubleshooting: Symptoms, causes, & remedies; 3.1 Excessive current draw; 3.2 Protection, muting, and turn-on;turn-off delay problems

Technical Service Manual 15
ISA Series Power Amplifiers
2. Component identification and pinout
1
2
3
4
8
7
6
5
AB
OUTPUT A
INVERTING
INPUT A
NON-INVERTING
INPUT A
V-
OUTPUT B
INVERTING
INPUT B
NON-INVERTING
INPUT B
V+
1
2
3
4
8
7
6
5
GROUND 1
NON-INVERTING
INPUT
INVERTING
INPUT
V-
OUTPUT
BALANCE/
STROBE
BALANCE
V+
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
AB
NON-INVERTING
INPUT A
V-
AMP BIAS INPUT B
NON-INVERTING
INPUT B
INVERTING INPUT B
OUTPUT B
BUFFER INPUT B
BUFFER OUTPUT B
V+
DIODE BIAS B
AMP BIAS INPUT A
DIODE BIAS A
INVERTING INPUT A
OUTPUT A
BUFFER INPUT A
BUFFER OUTPUT A
NE5532AN Dual operational amplifier
LM311 Voltage comparator
LM13600 Dual operational transconductance
amplifier
4N29 Opto-isolator
1
2
3
6
5
4
2N5064 Sensitive gate thyristor
KAG