Sherwood RX-4109 User manual

RX-4109
AM/FM STEREO RECEIVER
- BLOCK DIAGRAM - MECHANICAL PARTS LIST
- WIRING DIAGRAM - EXPLODED VIEW
- CIRCUIT DESCRIPTION - ELECTRICAL PARTS LIST
- TROUBLESHOOTING - IC'S FUNCTIONAL BLOCK DIAGRAM
- TUNER ALIGNMENT - SCHEMATIC DIAGRAMS
◑ CONTENTS ◑
SERVICE MANUAL

SPEAKER RLY_B PROTECTION
TAPE
CD
VOLUME TONE
-15V
RLY
+5V
MAIN MUTE
SPEAKER RLY_A
MAIN
MUTE
+5V6
AGND
+15V
-B
FL FILAMENT
DC
PROTECTION
ST/BY TRANS
AC CORD
MAIN TRANS
AUX OUT
TAPE OUT
S/W
PHONO
TV/AUX
LC75343
POWER DOWN CHECK
ST/BY RLY
-30V
SPEAKER A
DIGI-LINK
INPUT
VIDEO REC MUTE
TAPE REC MUTE
DIGI-LINK
T_MUTE
PLL_DO
PLL_CL
PLL_CE
PLL_DI
TUNED
STEREO
TUNER
PACK
FL DISPLAY
+15V
SPEAKER B
DIGI-LINK
OUTPUT
HEADPHONE
MAIN
AMP

2P 2P
2P
3P
CP401 29P
CN401 29P
FLT
AC CORD
CN406
CN402
2P
CP404
CP402 CP403 CN500
FPC Card
Cable
CN700
6P
From PUSH SW
CP406
2P
CP505
2P
CP503 2P
CP502
2P
CP501A
3P
CP501 3P
CN404
3P
4P
2P
TO MAIN B'D
CN301
POWER
TRANS

CXP82532-344Q : IC401
1. Pin Description
G10 G9 G8 G7 G6 G5 G4 G3 G2 G1 OPEN VDD OPEN
OPEN OPEN
S1 S2 S3
S4 S5
G2/A2 G3/A3 G4/A4 G5/A5 G6/A6 G7/A7 G8/A8 G9/A9
G10/A10 G11/A11 G12/A12
VDD
G13/A13 G14/A14 G15/A15
A16 A17 A18 A19 A20
G11 G1/A1 A21 S6
G12 G0/A0 A22 S7
NC NC A23 S8
PCHECK PE0 A24 S9
JOG_A PE1 A25 S10
RDS_CL PE2 A26 S11
JOG_B PE3 A27 S12
RMC PE4 A28 S13
RDS_DATA PE5 A29 S14
OPEN PE6 A30 S15
OPEN PE7 A31 S16
TUNED PC0 A32 OPEN
STEREO PC1 A33 OPEN
DIGILINK PC2 A34 OPEN
T_MUTE PC3 A35 OPEN
PLL_DO PC4 A36 OPEN
PLL_CL PC5 A37 OPEN
PLL_DI PC6 A38 OPEN
PLL_CE PC7 A39 OPEN
OPEN PB0 A40 OPEN
FUNC_CE PB1 A41 OPEN
FUNC_DA PB2 A42 OPEN
FUNC_CL PB3 A43 OPEN
PROTECT PB4 A44 OPEN
HP_DET PB5 A45 OPEN
PWR_RLY PB6 A46 OPEN
ST/BY_LED PB7 A47 OPEN
AVREF AVREF A48 OPEN
VREC AN0 A49 OPEN
TREC AN1 A50 OPEN
AN2 AN3 AN4 AN5 AN6 AN7 AVSS /RST EXTAL XTAL VSS TX TEX VDD VFDP A55 A54 A53 A52 A51
L_MUTE
HP_RLY
TU_OPTION
SYSTEM_OPTION
KEY2 KEY1
GND
RESET
EXTAL
XTAL
GND
NC
GND
VDD
-30V
SPEAKER A_RLY SPEAKER B_RLY
OPEN OPEN OPEN
CIRCUIT DESCRIPTION
9
100 98 97 96 95 94 93 92 91 90 89 88 87 86 85
80
79
78
77
76
75
74
73
72
71
70
69
68
67
66
65
64
63
62
61
60
59
58
57
464544434241403938373635333231
24
23
22
21
20
19
18
17
16
15
14
13
12
11
11
9
8
7
6
5
4
3
2
1
34
29
28
27
26
25
30
50494847
56
55
54
53
52
51
84 83 82 81

2. Block diagram

Pin No. Pin Name Opeation Description Assign
1 G11 Grid FL PORT FL GRID O
2 G12 Grid FL PORT FL GRID O
3NC
4 Power Check Input for power down. AC CORD ON/OFF CHECK(LOW=AC
CORD OFF) I
5 Volume_Encoder A Input for main volume up/down. Volume encoder up/down I
6 RDS_CLK Output for RDS clock of TDA7330 RDS CLOCK I
7 Volume_Encoder B Input for main volume up/down. Volume encoder up/down I
8 Remote control Input for remocon data. Remote control input I
9 RDS_DATA Input for RDS data of BU1924 RDS DATA I
10 ~ 11 N.C
12 Tuned Input for detecting "TUNED" condition. Tuned signal in (Low=Tuned OK) I
13 Stereo Input for detecting STEREO condition. Stereo in (Low=stereo OK) I
14 Digi-link Digi-link input/output Digi-link input/output I/O
15 T-Mute Output for TUNER MUTE Tuner Mute ON O
16 PLL_DO Tuner PLL Data out I
17 PLL_CLK Tuner PLL Clock I
18 PLL_DI Tuner PLL Data in O
19 PLL_CE Tuner PLL Chip enable O
20 N.C
21 LC75343_CE Output for chip enable of LC75343 IC O
22 LC75343_DATA Output for data of LC75343 IC FRONT SPEAKER RELAY ON/OFF O
23 LC75343_CLK Output for clock of LC75343 IC HEADPHON RELAY ON/OFF O
24 Protection Input for detecting
"PROTECTION" condition. Protect in (High →Power off) O
25 H/P_Detection Input for detecting the connection I
26 Power_Relay Output for "power relay ON/OFF" O
27 ST/BY LED Output to drive standby LED O
28 AVREF Reference voltage. (Connected to +5V,
Not VDD.) O
29 VREC Output for "Video REC ON/OFF" O
30 TREC Output for "Tape REC ON/OFF" O
31 L-MUTE Output for Front L/R MUTE O
32 H/P RLY Output for "HEADPHONE RELAY
ON/OFF" HEADPHON RELAY ON/OFF O
33 TU-Option Input for selecting the frequency ranges
steps . I
34 System Option Input for selecting set option. I
35 KEY2 Data input for key scan. I
36 KEY1 Data input for key scan. I
37 GND Ground
38 Reset Input for resetting the CPU I
39 EXTAL Input for 10MHz crystal oscillator. I
3. Pin Functions

Pin No. Pin Name Opeation Description Assign
40 XTAL Output for 10MHz crystal oscillator. I
41 GND Ground Ground
42 N.C
43 GND Ground Ground
44 VDD +5V power supply
45 VFDP -30V Supply
46 Speaker"A" relay Output for Speaker Relay "A"ON/OFF O
47 Speaker"B" relay Output for Speaker Relay "B"ON/OFF O
48 ~ 69 N.C
70 S16 SEGMENT FL PORT FL SEGMENT O
71 S15 SEGMENT FL PORT FL SEGMENT O
72 S14 SEGMENT FL PORT FL SEGMENT O
73 S13 SEGMENT FL PORT FL SEGMENT O
74 S12 SEGMENT FL PORT FL SEGMENT O
75 S11 SEGMENT FL PORT FL SEGMENT O
76 S10 SEGMENT FL PORT FL SEGMENT O
77 S09 SEGMENT FL PORT FL SEGMENT O
78 S08 SEGMENT FL PORT FL SEGMENT O
79 S07 SEGMENT FL PORT FL SEGMENT O
80 S06 SEGMENT FL PORT FL SEGMENT O
81 S05 SEGMENT FL PORT FL SEGMENT O
82 S04 SEGMENT FL PORT FL SEGMENT O
83 S03 SEGMENT FL PORT FL SEGMENT O
84 S02 SEGMENT FL PORT FL SEGMENT O
85 S01 SEGMENT FL PORT FL SEGMENT O
86 ~ 88 N.C
89 VDD +5V power supply
90 N.C
91 G1 Grid FL PORT FL GRID O
92 G2 Grid FL PORT FL GRID O
93 G3 Grid FL PORT FL GRID O
94 G4 Grid FL PORT FL GRID O
98 G5 Grid FL PORT FL GRID O
95 G6 Grid FL PORT FL GRID O
96 G7 Grid FL PORT FL GRID O
97 G8 Grid FL PORT FL GRID O
99 G9 Grid FL PORT FL GRID O
100 G10 Grid FL PORT FL GRID O

Symptom
Power On Failure. A) AC-Cord check.
1. FLT does not light up. B) Power Trans ( Main/ST-BY ) check.
2. ST-BY LED does not light up. C) Fuse's disconnection check. FUSE ( 501 )
D) Connector's disconnection or disjuction.
Change or close insertion of the connector. CP ( 503 )
E) Inferior Stany-By switch. SW ( SW401 )
F) µ-COM I.C & Resonator check.
1. µ-COM IC B+( 5 )V check. I.C Pin No. ( 72 )
2. µ-COM clock pulse check. X-TAL( 401 )
Fuse Disconnection. A) Inferior transformer.
(Power On) B) AMP Drive Transistor out ( POWER TR ) Q ( 306L/R, 307L/R )
C) AMP Drive I.C out ( POWER TR ) Q ( 305L/R )
Key Disorder. A) KEY's being pushed check. SW ( 401 ~ 410 )
B) KEY Signal input components inferior. R ( 427 )
C) KEY data check. I.C Pin No.( 35, 36 )
D) µ-COM I.C or Resonator inferior. I.C No. ( 401 )
1. µ-COM IC B+( 5.5 )V check I.C Pin No. ( 89 )
2. µ-COM clock pulse check. X-TAL ( 40 )
Power Off in 2~3 sec. A) Drive I.C out ( POWER TR ) Q ( 306L/R, 307L/R )
after Power On. B) Drive Transistor out ( POWER TR ) Q ( 305L/R )
C) Protection circuit check.
1. Output DC check. R ( 537, 532 )
2. µ-COM I.C protection terminal check. I.C Pin No. ( 24 )
D) Posistor's connector disconnectoin. CP ( 210 )
Bump Sound. A) POWER MUTE transistor's out and inferior. Q ( 315, 314L/R )
( During Input-Select Switch's change. ) µ-Com Front Mute Control PORT check. I.C Pin No. ( 31 )
Sounds from Speaker. A) HEADPHONE JACK connection inferior. JACK ( 1 )
when Headphone's connected . B) µ-Com I.C inferior.
1. µ-Com H/P IN/OUT control "PORT"check. I.C Pin No. ( 25 )
Bass Control Failure. A) TONE VOLUME IC check.
Treble Control Failure. 1. Signal IN/OUT terminal. I.C Pin No. ( 7, 31 )
2. IC voltage check ( +10 )V I.C Pin No. ( 35 )
3. IC control data check. I.C Pin No. ( 1, 2, 36 )
AMP Sound dead. A) Signal Mute TR's inferior. Q ( 319, 314L/R )
1. L / R Channel dead. B) Connector disconnection & disjunction. CP ( 401 )
2. LEFT Channel dead. Changer or close insertion of the connector.
Cause and Remedy
TROUBLESHOOTING
Ref NO.

Symptom Cause and Remedy Ref NO.
3. RIGHT Channel dead. C) Speaker wire's disjuction.
Close insertion of the speaker wire.
D) Signal switching IC check. I.C ( 101 )
1. IC voltage check ( +10 )V I.C Pin No. ( 35 )
2. Switching IC control data check. I.C Pin No. ( 1, 2, 36 )
3. Switching IC signal IN/OUT check. I.C Pin No. ( 7, 31 )
Digi-Link Failure. A) Digi-Link line disconnection check.
Digi-Link IN/OUT circuit check. R ( 439, 440 ) D ( 404 )
B) µ-COM IC & Resonator inferior.
1. µ-COM IC B+( 5 )V check. I.C Pin No ( 14 )
2. µ-COM clock pulse check. X-TAL ( 40 )
Remote Controller Failure. A) Battery check.
B) RMC I.C & Resonator inferior.
1. RMC IC B+( 5 )V check. I.C Pin No. ( 8 )
2. RMC clock pulse check. X-TAL ( RMC 401 )
FM Failure. A) FM MUTE adjustment inferior. VR ( 01 )
B) FRONT-END inferior.
C) FM DET COIL inferior. DET ( 1 )
D) PLL IC check.
1. PLL IC B+( 5 )V check. I.C Pin No. ( 17 )
2. PLL control data check ( Data/CE/Clock ) I.C Pin No. ( 3, 4, 5, 6 )
Stereo Effect Failure. A) FM DET COIL Inferior. DET ( 1 )
Stereo does not light up. B) MPX IC inferior. I.C ( 01 )
1. MPX IC B+( 9.1 )V check. I.C Pin No. ( 8 )
2. MPX control data check. I.C Pin No. ( 7 )
C) FM MUTE adjustment inferior. SVR ( 01 )
AM Failure. A) AM V.T voltage inferior. AM OSC ( BLACK COIL )
B) PLL IC check.
1. PLL IC B+( 5 )V check. I.C Pin No. ( 17 )
2. PLL control data check ( Data/CE/Clock ) I.C Pin No. ( 3, 4, 5, 6 )
Tuner Sound Dead. A) MUTE TR inferior. Q ( 9, 10, 11 )
1. L / R Channel dead. B) Connector's disconnection or disjuction. CP ( 101 )
2. LEFT Channel dead. Change or Close insertion of the connector.
3. RIGHT Channel dead. C) FM DET COIL inferior. FM DET ( 1 )
D) AM IFT COIL inferior. RED COIL
E) MPX I.C check. I.C ( 01 )
1. Signal IN/OUT terminal. I.C Pin No. ( 1, 16, 17 )
2. I.C driving voltage check ( + 9.1V ) IC ( 01 )

1. Electrical specification.
Local OSC
Frequency cover range( E/RDS )
Frequency cover range( K )
Standard supply voltage
FM Antenna input Impedance
AM Loop Antenna
2. Electrical Characteristics.
AF Output Level ( E/RDS )
AF Output Level ( K )
Auto Stop Level
Stereo Separation ( E/RDS ) 1kHz
Stereo Separation ( K ) 1kHz
AF Output Level ( E/RDS )
AF Output Level ( K )
Auto Stop Level( E/RDS )
Auto Stop Level ( K )
3. Adjust Point.
dBu SVR03
MW 30 165 ± 50 mV Non Adjust
--
30 180 ± 50
FM
47㏀Load 1000 74
47㏀Load
60
47㏀Load 999 74
Non Adjust
98.1 60 40 min dB SVR02
98.1 60 500±100
98.1
TUNER ALIGNMENT
520 ~1710kHz 87.5 ~ 108.0MHz
ITEMS SPECIFICATION
1-1
75 ohm
40
47㏀Load 98.1 60 600±100 mV
20 ±5 dBu
mV
1-3
1-4
No.
11.5uH ( 2.52MHz )
15.0(±1.5V)
Above the receiving Frequency
M W F M
522 ~ 1611kHz 87.5 ~ 108.0MHz
1-5
Adjustment
1-2
SVR01
UNITSpecification
No.
Non Adjust
98.1 --
TEST ITEMS MOD.T.L.
999
kHz,%dBu
TEST
CONDITION T.P.
1000 -- 30 58 ±10
SVR02
SVR0330 58 ±10
35 min dB
mV Non Adjust
dBu