Samsung MM-DA25, Service Manual

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7-2 Samsung Electronics
Schematic Diagram
This Document can not be used without Samsung’s authorization.
7-1 Overall Block Diagram

A24/A25 Block Diagram
ANT
AUX-L
AUX-L
TUNER-L
TUNER-R
TAPE-L
TAPE-R
CD-L
CD-R
AC CORD
HEAD
PHONE
SPK-L
SPK-R
MCW12
L-CH
R-CH
CE CLK DATA
CE CLK DATA
VFD CONTROL
VP
VFD+
VFD-
CD-ON
P-SENSE
5.6V
P-ON
GND
12V
VCC-
VCC-
GND
GND
VCC+
VCC+
TUNER
PACK
TAPE
DECK
CD/MP3/WMA
DECK
SMPS
VFD
MICOM IC
HIC2
4556
UIC2
FRONT PCB
PT6315
FIC1
FUNCTION IC
R2S15904
AAIC1
AMPLIFER IC
TDA8922BJ

DA25 Block Diagram
ANT
AUX-L
AUX-L
TUNER-L
TUNER-R
TAPE-L
TAPE-R
CD-L
CD-R
AC CORD
HEAD
PHONE
PCW13
(MAIN)
R-CH
L-CH
CE CLK DATA
CE CLK DATA
VFD CONTROL
VP
VFD+
VFD-
CD-ON
P-SENSE
5.6V
P-ON
GND
12V
VCC-
VCC-
GND
GND
VCC+
VCC+
TUNER
PACK
TAPE
DECK
CD/MP3/WMA
DECK
SMPS
VFD
MIC
MICOM IC
HIC2
4556
UIC2
FRONT PCB
PT6315
FIC1
FUNCTION IC
R2S15904
FIC2
4558
SPK-L
SPK-R
AAIC1
AMPLIFER IC
TDA8922BJ
AGND
MIC SIGNAL
A10V EGND EGND 3.3V 5.0V MGND M8V

Main System MICOM control Function IC (R2S15904), Tuner pack, Tape deck IC (HA12237F), CD/DVD DECK.
It gets all information from R2S15904. They have a communication among them with the HOST ↔ SLAVE interface.
And Main System MICOM gets the information from User’s remote control. So whenever it gets the information, it
displays it on the VFD.

PCW3 on MAIN PCB gets power from SMPS;

PCN1A on DVD PCB gets power from SMPS;

The CD Deck, Tape Deck, AUX Jack and Tuner Pack GND are each connected to Function IC (R2s15904).
Then GND after processing. The Data will be sent to AMP IC VCC+ (AAIC1).

Headphone IC (4556) gets signal from Function and output it to H/P JACK.