Kenwood KDC-W8534 Service Manual page 4

KDC-W8534/W8534Y
KDC-X790
Ref. No.
Q41,43,44 Illumination AVR
Q50~52 SW16V (Surge Protection)
Q60 VFD (4.7V) AVR SW
Q61 Switching Regulator frequency control SW (IC60)
Q62 Mecha digital AVR SW
Q63 VFD (4.7V) AVR Switching Power Driver
Q64 Mecha digital AVR Power Driver
Q80,81 VFD (57V) AVR SW
Q91 Panel5V Discharge SW
Q100,101 Panel Detect SW
Q200,201 Pre-out mute driver
Q202 Acc Detect SW
Q204 Surge Detect SW
Q205 B.U Detected SW
Q206 Ext Amp Control Buffer
Q207 Small-lamp Detect SW
Q208,209 Power Antenna SW
Q300 DSP mute SW
Q402,403 AM+B SW
Q450 DSI Driver
Q600~602 Pre-Amp +9V AVR
Q603~605 Pre-Amp -9V AVR
Q606,607 AUDIO 10.5V AVR
Q608~613 Pre-out mute SW
Q800,802 REF+B AVR
Q801 SVR6.8V Ref Supply AGC Controller
4
COMPONENTS DESCRIPTION
Application / Function Operation / Condition / Compatibility
When Q43' 2pin goes Hi, Ill AVR outputs 10.5V.
When Q51' 2pin goes Hi, SW16V outputs 13V.
When base goes Hi, VFD AVR off.
2pin
L H
1pin
L 400kHz 600kHz
H 650kHz 850kHz
When base goes Hi, Mecha digital AVR off.
∗DXM-680x : 4V, Other : 5V
This FET is governed by IC60.
Frequency is decided at Q61.
This FET is governed by IC60.
Frequency is fixed 400kHz.
When Q81' base goes Hi, VFD (57V) AVR outputs 57V.
When Q91' base goes Hi, Panel5V is discharged.
When Q100' base goes Lo, panel is detected.
When a base gose Lo, mute driver is turned on.
When Q202' base gose Hi, Acc voltage is detected.
When Q204' base goes Hi, IC750 is changed into a standby state.
When Q35' base gose Hi, B.U voltage is detected.
It is buffer for IC102 output.
When Q207' base goes Hi, Small-lamp is detected.
When Q206' base goes Hi, power antenna switch outputs 14V.
When base goes Lo, DSP is set to mute.
When Q403' base gose Hi, AM+B is outputs.
DSI lights when the base is "L".
DSI turns off when the base is "H".
DSI turns on and off when panel is taken off.
Q600 and 602 works as a differential amplifier,
Q601 works as a driver and +9.4V is supplied to OP Amp for Pre-out.
Q603 and 605 works as a differential amplifier,
Q604 works as a driver and -9.1V is supplied to OP Amp for Pre-out.
When Q606' base goes Hi, AVR outputs 10.5V.
When a base gose Hi, Pre-out is set to mute.
When Q800' base goes Hi, AVR outputs 13V.
When the voltage of B.U voltage falls, a return is hung and an output
is reduced.