Technical Service Manual; Isa Series Power Amplifiers - QSC ISA280 Technical & Service Manual

8
THIS DOCUMENT CONTAINS PROPRIETARY
INFORMATION THAT IS THE PROPERTY
OF QSC AUDIO PRODUCTS, WHICH MAY NOT
BE DISCLOSED, REPRODUCED OR USED
WITHOUT EXPRESS WRITTEN CONSENT FROM
QSC AUDIO PRODUCTS.
D
PC–007503–00, DATAPORT PCB
J401:1 J108:1
R112
J401:2 J108:2
CH 1
LINEAR
2.5K
GAIN POT
J401:3 J108:3
J102:1 J421:2
J102:2 J421:1
J102:3 J421:3
J50:
HD–15 JACK
J50:1
C J50:2
J50:3 J422:2 J106:2
J50:4 J422:3 J106:3
J50:5 J423:2 J206:2
J50:6
J50:7
J422:1 J106:1
J50:8
J50:9 J422:4 J106:4
J50:10
J50:11
J50:12
J50:13 J423:3 J206:3
B
J50:14 J423:1 J206:1
J50:15 J423:4 J206:4
J202:1 J421:6
J202:2 J421:5
TO J400,
PIN TO PIN,
SH 2
J202:3 J421:4
J402:1 J208:1
CH 2 R212
J402:2 J208:2
LINEAR
GAIN POT
2.5K
J402:3 J208:3
A
Gray shading indicates
signal path
NOTES: UNLESS OTHERWISE SPECIFIED
8

Technical Service Manual

ISA Series Power Amplifiers

7 6
PC–007505–00,
POWER LED PCB
J425:2 J207:2
J425:1 J207:1
PC–007504–00, DISPLAY PCB
J424:1
J424:2
J258:1–4
SEE SH 2
J424:3
J424:4
J424:5 J258:5
J424:6 J258:6
J424:7
J258:7 & 8,
J424:8 SH 3
SPEAKER BUS – BEFORE FUSE
4–5 MA CHARGE CURRENT
1 MA DISCHARGE
SW—GND FOR CLIP LIM
SEE SH 2
BR MONO RETURN—CAUTION, SENSITIVE NODE
J105:1 J205:1
ISA 800T
J105:2 J205:2
J105:3 J205:3
page 2 of 3
J105:4 J205:4
7 6
5 4
CONNECTS TO LOWER
POS. RAIL ON SAME
SIDE AS DISPLAY LEDs
SERIES REGULATOR
SUPPLIES APPROX
40MA TO HD-15 PORT
POS STEP DRIVER
NEG STEP DRIVER
5 4
3 2
CHANNEL 2
DC FAULT
PROTECTION
SIZE FSCM NO. DWG NO.
D
SCALE: NONE CAD FILE NO:
3 2 PLOT DATE:
Wed Sep 05, 2001
1
D
C
CH.2 OUTPUT
AUTOFORMER
(CHASSIS-MOUNTED)
TO J6,
SH 2
TO J5 & J6,
SH 2
B
A
REV
SH–008001–00
A
SHEET 4 OF 4
SH8001ra.sch
1
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