Service manual

CD-MPX870
6 – 1
CHAPTER 6. CIRCUIT SCHEMATICS AND PARTS LAYOUT
[1] Notes on schematic diagram
• Resistor:
To differentiate the units of resistors, such symbol
as K and M are used: the symbol K means 1000
ohm and the symbol M means 1000 kohm and the
resistor without any symbol is ohm-type resistor.
Besides, the one with “Fusible” is a fuse type.
• Capacitor:
To indicate the unit of capacitor, a symbol P is used:
this symbol P means pico-farad and the unit of the
capacitor without such a symbol is microfarad. As to
electrolytic capacitor, the expression “capacitance/
withstand voltage” is used.
(CH), (TH), (RH), (UJ): Temperature compensation
(ML): Mylar type
(P.P.): Polypropylene type
• Schematic diagram and Wiring Side of P.W.Board
for this model are subject to change for improve-
ment without prior notice.
• The indicated voltage in each section is the one
measured by Digital Multimeter between such a
section and the chassis with no signal given.
1. In the tuner section,
indicates AM
indicates FM stereo
2. In the main section, a tape is being played back.
3. In the deck section, a tape is being played back.
( ) indicates the record state.
4. In the power section, a tape is being played back.
5. In the CD section, the CD is stopped.
• Parts marked with “ “ ( ) are impor-
tant for maintaining the safety of the set. Be sure to
replace these parts with specified ones for maintain-
ing the safety and performance of the set.
[2] Types of transistor and LED
REF. NO DESCRIPTION POSITION
JOG701 VOLUME MAX—MIN
SW701 POWER ON /STAND-BY ON—OFF
SW702 CD ON—OFF
SW703 TUNER (BAND) ON—OFF
SW704 AUX ON—OFF
SW705 TAPE ON—OFF
SW707 PLAY ON—OFF
SW708 FAST FORWARD/PRESET UP ON—OFF
SW709 FAST REWIND/PRESET DOWN ON—OFF
SW710 STOP ON—OFF
SW711 DISC 1 ON—OFF
SW712 DISC 2 ON—OFF
SW713 DISC 3 ON—OFF
SW714 DISC 4 ON—OFF
SW715 DISC 5 ON—OFF
SW716 OPEN/CLOSE ON—OFF
REF. NO DESCRIPTION POSITION
KTA1504 GR
KRA107 S
KRC102 S
KRC104 S
KTA1504 Y
KTC3875 GR
B
(3)
E
(1)
C
(2)
TOP
VIEW
KDS184
TOP VIEW
TOP VIEW
KTA1271 Y
KTA1273 Y
KTA1274 Y
KIA78L05
VIEW
FRONT
ECB
(S)(G)(D)
(1)(2)(3)
KDS160
1N404S
1N4148H
D1SS119
DRL204F
TS10B05G
AC AC
VIEW
FRONT
FRONT
VIEW
503BC2E30
SLR342VC
SDPB40F2
KTC3199 GR
KTC3200 GR
KTC3203 Y
KTC3205 Y