QSC ISA280 - Technical Service Manual; ISA Series Power Amplifiers

Technical Service Manual 113
ISA Series Power Amplifiers
Gray shading indicates
signal path
SEE SH 2
ISA 500T
page 2 of 3
THIS DOCUMENT CONTAINS PROPRIETARY
INFORMATIONTHAT IS THE PROPERTY
OF QSC AUDIO PRODUCTS, WHICH MAY NOT
BE DISCLOSED, REPRODUCED OR USED
WITHOUT EXPRESS WRITTEN CONSENT FROM
QSC AUDIO PRODUCTS.
A
B
C
D
A
B
C
D
87 6543 21
87 6543 21
NOTES: UNLESS OTHERWISE SPECIFIED
PLOT DATE:
Wed Sep 05, 2001
SCALE:
NONE
SIZE
D
FSCM NO. DWG NO.
SHEET 3 OF 4
SH–005001–00
CAD FILE NO:
SH5001ra.sch
REV
A
A 3 SH–005001–00
REV
SH
DWG NO.
CHANNEL 2
PC–004503–00, DATAPORT PCB
PC–004504–00, DISPLAY PCB
PC–004505–00,
POWER LED PCB
CH 1
LINEAR
GAIN POT
CH 2
LINEAR
GAIN POT
R112
2.5K
R212
2.5K
SERIES REGULATOR
SUPPLIES APPROX
40MA TO HD-15 PORT
BR MONO RETURN—CAUTION, SENSITIVE NODE
SW—GND FOR CLIP LIM
J401:1 J108:1
J401:2 J108:2
J401:3 J108:3
J421:2
J421:1
J421:3
J422:2 J345:2
J422:3 J345:3
J423:2 J348:2
J422:1 J345:1
J422:4 J345:4
J423:3 J348:3
J423:1 J348:1
J423:4 J348:4
J421:5
J421:6
J421:4
J402:1 J208:1
J402:2 J208:2
J402:3 J208:3
TO J5 & J6,
SH 2
SPEAKER BUS – BEFORE FUSE
J102:1
J102:2
J102:3
J50:1
J50:2
J50:3
J50:4
J50:5
J50:6
J50:7
J50:8
J50:9
J50:10
J50:11
J50:12
J50:13
J50:14
J50:15
J50:
HD–15 JACK
J202:1
J202:2
J202:3
J297:1–4
SEE SH 2
J297:7 & 8,
SH 3
J337:2
J337:1
J425:2
J425:1
J424:1
J424:2
J424:3
J424:4
J424:5
J424:6
J424:7
J424:8
J297:5
J297:6
TO J6,
SH 2
TO J400,
PIN TO PIN,
SH 2
SEE SH 2
0.001µF 100V 5%
5.6V 0.25W
CONNECTS DIRECTLY
TO COMPONENTS W/
SAME REF DESG. ON
MAIN PCB, SH 3.
CH. 2 OUTPUT
AUTOFORMER,
CHASSIS MOUNTED.
CONNECTS TO
POS. RAIL ON SAME
SIDE AS DISPLAY LEDS
SERIES REGULATOR
SUPPLIES APPROX
40 MA TO HD-15 PORT