Kenwood KAC-6403 Service Manual page 4

KAC-6403
Ref. No Application / Function
D203,204 Current mirror
D205,206 B-class stage mute
D207~211 Over-current DET
D601 LED control
D602,603 Mute control
D604 Mute AVR
D605 Power control
D606 Over-current DET
D607 Power control
D608 Mute control
D610 LED
D613,614 DC protection
D616 POP mute
No. Item
1 IDEL CURRENT
4
COMPONENTS DESCRIPTION
Current mirror load for 2nd deferential amplifier.
Prevents reverse flow.
Prevents reverse flow.
Controls D610's power indicator.
Prevents reverse flow.
10V
Prevents reverse flow.
Level shift for primary power supply.
Level shift
Being controlled by Q602.
Being controlled by Q602.
Operates when DC is output.
ADJUSTMENT
Alignment Point
Connect a DC voltmeter between
VR5 (A-Lch) the following emitter resistors.
VR6 (A-Rch) R253 (A-Lch)
VR7 (B-Lch) R254 (A-Rch)
VR8 (B-Rch) R453 (B-Lch)
R454 (B-Rch)
Operation / Condition / Compatibility
Method Align for
2.5mV
Note Fig.
PC BOARD
Over 5 minutes
on page 6
aging is required.
and 7.