Sherwood RX-4109B/B Service Manual page 9

Symptom
Remote Controller Failure.
FM Failure.
Stereo Effect Failure.
Stereo does not light up.
AM Failure.
Tuner Sound Dead.
1. L / R Channel dead.
2. LEFT Channel dead.
3. RIGHT Channel dead.
Cause and Remedy
A) Battery check.
B) RMC I.C inferior.
1. RMC IC B+( 5 )V check.
2. RMC clock pulse check.
A) FM MUTE adjustment inferior.
B) FRONT-END inferior.
C) FM DET COIL inferior.
D)TUNER PACK check
1.TUNER PACK +12V check
2.PLL control data check (DATA/CE/Clock)
E) TUNER B+ voltage inferior
F) u-COM IC
1.u-COM IC 5V check
2. u-COM control DATA check
A) FM DET COIL Inferior.
B)TUNER PACK check
1.TUNER PACK +12V check
2.PLL control data check (DATA/CE/Clock)
C) STEREO adjustment inferior.
D) FM MUTE adjustment inferior.
A) AM V.T voltage inferior.
B)TUNER PACK check
1.TUNER PACK +12V check
2.PLL control data check (DATA/CE/Clock)
C)TUNER B+ voltage inferior
D)AM OSC COIL inferior
E) u-COM IC
1.u-COM IC 5V check
2. u-COM control DATA check
A) Connector's disconnection or disjuction.
Change or Close insertion of the connector.
B) AM/FM IF IC check
1.Signal IN/OUT terminal
2.IC driving voltage check (+12)
C) FM DET COIL inferior.
D) AM IFT COIL inferior.
E)TUNER PACK check
1.TUNER PACK +12V check
2.PLL control data check (DATA/CE/Clock)
Ref NO.
REM401
IC301 ( 4 )
PACK401(MAIN)
Pin#4
Pin#5,6,7,8,9
IC301(MAIN)
I.C Pin No.( 12 )
I.C Pin No.( 20, 24, 25, 26 )
PACK401(MAIN)
Pin#4
Pin#5,6,7,8,9
AM OSC ( BLACK COIL )
PACK401(MAIN)
Pin#4
Pin#5,6,7,8,9
IC301(MAIN)
I.C Pin No.( 12 )
I.C Pin No.( 20, 24, 25, 26 )
PACK401(MAIN)
Pin#4
Pin#5,6,7,8,9