KAC-6402
3
COMPONENTS DESCRIPTION
ADJUSTMENT
No.
Item
Alignment point
Method
Align for
Note
VR5 (ALch)
1
IDLE
VR6 (ARch)
Connect a DC voltmeter
2.5mV
After Power on
CURRENT
VR7 (BLch)
between emitter resister
5 minutes
VR8 (BRch)
Q226
Q224
Q225
Q223
Q124
Q126
Q123
Q125
VR5
AL
AR
VR6
BR
VR8
BL
VR7
DC voltmeter
BRch 2.5mV
R456
DC voltmeter
BLch 2.5mV
R455
DC voltmeter
ALch 2.5mV
DC voltmeter
ARch 2.5mV
R255
R256
Ref. No.
Application / Function
Operation / Condition / Compatibility
Q613,614
DC output voltage detection
Latch circuit at DC detection
Q615,616
B-class step mute transistor
Circuit for turning OFF input of power amplification step
Q617,618
B-class step mute transistor
Driver for Q615,616: Normally ON
D1
Reverse connection protection
Melts off fuse when primary power supply is inversely connected
for primary power supply
D2,3
AVR reference voltage
Control Q3,4 by Zenner voltage generated at D2,3
D4,5
Secondary power supply rectifier
D6~9
Switching
Reverse flow prevention
D22,201,101,102
Temperature compensation
Makes 2nd step deferential transistor
∆
Vbe current constant
D32~37
Static protection
Prevents ope amp destruction by static
D103,104,203,204
Current mirror
2nd step deferential amplifier current mirror load
D105,106,205,206
B-class step mute
Reverse flow prevention
D107~110,207~210
Excess current detection
Reverse flow prevention
D229,430
Input mute
Reverse flow prevention of signal current
D601
LED control
D610 power indicator control
D602,603
Mute control
Reverse flow prevention
D604
AVR for mute
10V
D605
Power control
Reverse flow prevention
D606
Primary power supply excess
Level shift
voltage detectoin
D607
Power control
Level shift
