JBL A6000GTi, Service Manual, Page: 5 / 62

137159-1 Rev. 1 A6000GTi Service Manual

2003 Crown Audio, Inc.
V
Table of Contents
1. INTRODUCTION ..................................................................................................... 1-1
1.1. T
HE
A6000GT
I
C
AR
A
MPLIFIER
........................................................................... 1-1
1.2. S
COPE
............................................................................................................... 1-1
1.3. W
ARRANTY
......................................................................................................... 1-1
2. SPECIFICATIONS ................................................................................................... 2-1
2.1. O
UTPUT
P
OWER
................................................................................................. 2-1
2.2. P
ERFORMANCE
................................................................................................... 2-1
2.3. C
ONTROLS
& C
ONNECTORS
................................................................................. 2-2
2.4. I
NDICATORS
........................................................................................................ 2-2
2.5. I
NPUT
/O
UTPUT
.................................................................................................... 2-2
2.6. P
ROTECTION
...................................................................................................... 2-3
3. THEORY OF OPERATIONS ................................................................................... 3-1
3.1. A
UDIO
S
IGNAL
P
ATH
............................................................................................ 3-1
3.1.1. Input Stage ................................................................................................ 3-1
3.1.2. Error Amplifier ............................................................................................ 3-2
3.1.3. Modulator .................................................................................................. 3-2
3.1.4. Triangle Generator..................................................................................... 3-2
3.1.5. Output ........................................................................................................ 3-3
3.1.6. Output Filter ............................................................................................... 3-4
3.2. P
ROTECTION AND
C
ONTROL
C
IRCUITRY
................................................................ 3-5
3.2.1. Current Monitor .......................................................................................... 3-5
3.2.2. Current Limiter ........................................................................................... 3-5
3.2.3. Display Circuitry ......................................................................................... 3-5
3.2.4. Thermal Limit Control (TLC) ...................................................................... 3-6
3.3. P
OWER
S
UPPLY
.................................................................................................. 3-7
3.3.1. Switching Power Supply Operation ............................................................ 3-7
3.3.2. Switching Power Supply Protection Circuit ................................................ 3-7
3.3.3. (LVPS) Low Voltage Power Supply Operation ........................................... 3-7
4. MAINTENANCE ...................................................................................................... 4-1
4.1. W
HERE TO
B
EGIN
................................................................................................ 4-1
4.2. S
URFACE
M
OUNT
T
ECHNOLOGY
........................................................................... 4-1
4.3. D
ISASSEMBLY FOR
I
NSPECTION
& S
ERVICE
............................................................ 4-2
4.3.1. Top Cover Removal ................................................................................... 4-2
4.3.2. Power Supply Discharge............................................................................ 4-4
4.3.3. Power Connection Housing Removal ........................................................ 4-5
4.3.4. Pip Assembly Removal .............................................................................. 4-6
4.3.5. Power Supply Assembly Removal ............................................................. 4-7
4.3.6. BCA Assembly Removal ............................................................................ 4-7
4.3.7 BCA Disassembly ...................................................................................... 4-8
4.4. T
ROUBLESHOOTING
............................................................................................. 4-9
4.4.1. Power Supply ............................................................................................ 4-9
4.4.2. Audio Section Trouble Shooting............................................................... 4-10