Kenwood KDCW 7027 Service Manual

Page 4

KDC-8026/M P825
KDC-MPV8025/W7027

COMPONENTS DESCRIPTION

Rel No. Application / Functions Operation / Condition / Compatibility
IC7 AVR BU2.5V AVFl
IC8 Selector IC Serial audio data selector
ICQ AVR 3.3V AVR (IC2 DAC part)
01,4 Level shift FET Level shift (3.3V - 5.0V)
03,5 Level shift TR Level shift (3.3V - 5.0V)
06 Level shift TFl Level shift (3.3V - 5.0V)
07 Level shift TFl Level shift (3.3V - 5.0V)
08 AFC Auto power control
09,10 Switching TR Sub beam delay control switch

0 ELECTRIC UNIT (X34-3040-10/1 1/21, X34-3042-71)
Rel No. Application / Functions Operation / Condition [Compatibility
IC1 System control IC System control microprocessor
IC2 E-VOL & tuner lC E-VOL. FM/AM tuner & stereo decoder
IC3 Power supply lC For A8V AVR
IC4 Audio power IC Audio power amplifier
ICS Power supply IC Switching regulator IC for CD5V
|C7 Reset IC When BU5V line voltage is less than 3.5V, this IC output line is L"
ICS Muting logic lC Control for MUTE, P-ANT & RESET muting
IC12 RDS decoder Decode for RDS signal
|C13,14 Motor driver Control for Panel mechanism motor
01,2 BU 5V AVR While BU is applied when BU5V regulator output is +5V
03 SW5V AVR When Q3base level goes L, SW5V regulator output is +5V
04,5 SW14V AVR When 05 base level goes H, SW14V regulator output is +14V
06-8 Audio 8V AVR When 06 base level goes H, A8V regulator output is +8.4V
09,34 Servo +B AVR When Q34 base level goes H, S+B regulator output is +7.4V
Q11~14 Illumination +B AVR When 011 base level goes H, AVR output is +10.5V
023,24 P-ANT SW When 023 base level goes H, P-ANT SW output is +14V
025,26 P-CON SW When 026 base level goes H, P-CPN SW output is +14V
027,28 P-CON protection Protect 027 by turning on when P-CON output is grounded
029 Butter EX amp control buffer
030 Small lamp det. SW When 030 base level goes H, 030 turned ON
032 BU detector When 032 base level goes H, 032 turned ON
033 A00 detector When 033 base level goes H, 033 turned ON
051,52 Muting driver When base level goes L, muting driver is turned ON
055,56,59,60 Pre-out muting SW When base level goes H, Pre-output is muted
063 E2P 5V SW When 063 base level goes L, E2P 5V is out for E2P ROM
0102,103 AM +B SW When 0102 base level goes H, AM +B is out to tuner unit
0104 Buffer Composite signal buffer tor RDS