Page 2
A
SPKR SIGGND GND
GND
A470-1W
CLIP
10K-2W
470-10V 470-10V
10K-2W
TO +15V
TO +15 V
TO -15 V
5K 5K
SPEAKER BUS
1N4004
10-25V
TO -24 V
470-1W
PTC-60CTHERMALLY
CONNECTED
T 6
+15 V
T15
-15 V
T16
PROCESSING BUFFER50C +O.5V
90C +8V
THERM ADJUST, 0.5-8.5V
THERMAL SENSING
T 1
T 3
GROUND MUTING INPUT CAP. TIMING CAP.
T 2
RELAY
DRIVER
T 4
ON-OFF MUTING DELAY
RELAY
MUTE -24V
RUN +15VMUTING BUS
RUN 0V MUTE +8V SHUTDOWN MUTING
IC-000010-00
MUTE BUS
T 5 T 7
THERMAL SENSE, 0-8V
T 8
THERMAL BUS, 0-8V
T 9
OP-AMP OUT - HF PROTECT
SHUTDOWN DETECTORS
TO MUTING
DC PROTECT SENSE
T10
THERMAL LIMITING
T11
IDLE -1.2V
CLIP +3V PEAKS 0-3Vac NORMAL AUDIO
4.5-6.5Vac CLIPPING PEAKS MUTE +4.5V
LIMITING THRESHOLD +4.5VCLIP RECTIFIER-BUFFER HIGH FREQ
DC RECTIFIER
THERMAL
T12 T13 T14
CLIP BUS OP-AMP OUT
OPTOCELL
T25
POSITIVE DRIVER, +0.6V IDLE
T24
NEGATIVE DRIVER, -0.6V IDLE
T23
POSITIVE BYPASS, +7.5V NORMAL, +2.5V SHORT
POSITIVE BIAS
CONTROLLER
T22
POSITIVE CURRENT FEEDBACK +3V PEAK
T21
POS CURRENT TRIMMER
T20
OUTPUT VOLTAGE FEEDBACK
LOAD IMPEDANCE
SENSING
T19
NEGATIVE TRIMMER
BIAS ENABLE
NEGATIVE BIAS
CONTROLLER
T18
NEGATIVE CURRENT FEEDBACK, -3V PEAK
T17
NEGATIVE BYPASS, -7.5V NORMAL, -2.5V SHORT
J 502-1
J 502-4 J 502-2
+ CURR LIM+ CURR LIM
- CURR LIM - CURR LIM- CURR LIM
R 598
TO Q 508
R 530 R 528 C 513 VR 503VR 502R 529 C 518U 503
R 527C 515 C 514 C 516 R 531
47-50V
47-50VD 512
.0033 100
BIAS 1N4004 1N4004
25 C .01 50 OHM BIAS
NETWORK
BIAS
J 502-3
VR 501
R 599
C 504
D 505
D 506 C 512
22-1W
2SA1302
.22-3W 2SC3281
IN5402
22-1W4.7-1W 4.7-1W
2SA1306B 2SC3298B
.103.9-2W
1N5402
2uH
.10
HEATSINK
GROUND AUDIO OUTPUT STAGE
.22-3W
3 PL3 PL
3 PL 3 PL
SPEAKER
COMMON
10A-250V
10A-250V
TRANSFORMER
CENTER TAP
SPEAKER
OUTPUT
NC NO
QSC PART
SW-000029-SW
TO -24 V
5.6-2W
J 502-6
J 502-8J 501
6-PIN MATE-LOK
3
4
6
1
2
5
C 511BR 501
F 501
F 503
K 501
Q 502
R 504
R 502
Q 501 R 519
R 518R 520 R 521 R 522
Q 508 Q 509 Q 510D 508
Q 505 Q 506 Q 507
R 516 R 515 R 517D 507L 501
R 525
C 506 R 524
C 5075.6-2W R 523
D 501
JUMPER
+70 V
-70 VTO -70 V RAIL
D 502
JUMPER
TO RECT BR 501
47K-1W R 542 TO -15V
C 510
R 508
R 507
N.C.
8200-80V
8200-80V
N.C.
N.C.
4.7K-1W
SCHEMATIC, EX-800, SHEET 2, AMPLIFIER CHANNEL ASCHEMATIC, EX-800, SHEET 2, AMPLIFIER CHANNEL A
+23V ON/OFF ENABLE TRANSFORMER THERMAL SENSOR THERMAL BUS TO FAN SPEED CONTROL
TO SHEET 1
J 52-5
J 52-6 2 OF 3 390
390 R 532, 47K
+INPUT
GND REF
PWR-ON AUDIO INPUT STAGEHEAVY LINE SHOWS
MAIN SIGNAL PATHSPEAKER BUS
47K-1WR 533VTL 5C4 U 504
68 p
A
5532 10K-4
75K
47
BA
3
5
68
47 +15 V
-15 V
DC2
1
A
.0022 47-10NP
C 525 U 506-B
R 541 RN 501
U 506-AC 520C 521 R 538 R 536 R 537 C 524
R 540 C 522
R 539
A
7 9 14
590
R 544
27K
4.7 K 46427p
12.1K-.5W
.10
220-10NPC 517 R 543
THERMAL
MUTE
14-PIN RIBBON
J 503
10
8
11
6
5
12
13 330K
TO +70 V RAIL
1N4735
6.2 VD 513
27p C 526
SH-004101-02 2 K
SH-004101-02 K
SH0800K2.FCD
1N4735
6.2 VD 511
D 509
1N 4148 D 510
1N 4148
