Sherwood RX-4109B Service Manual
BLOCK DIAGRAM
Model : RX-4109B/B
WIRING DIAGRAM
PCB1-4(PHONO)
Model : RX-4109B/B
TUNER ASS'Y
PCB2-1
(POWER S/W)
PCB1(MAIN)
PCB1-1(H/P)
PCB2-2
(SPK A/B)
PCB2(FRONT)
CIRCUIT DESCRIPTION
UPD78F0502M(T)5A4-A: IC301
1. Pin Description
PROTECT KEY2
VOL_DN KEY1
VOL_UP GND
REMOCON Avref
P_CHECK FLT & PLL CLK
RESET PLL_DI
FLMDO FLT &PLL DA_OUT
VREC FUNC_DA
TREC FUNC_CLK
REGC FLT_CE
GND PLL_CE
VDD FUNC_CE
NC ST/BY_RLY & FLT B+
TUNED NC
L_MUTE ST/BY_LED
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
3. Pin Functions
Pin No.
1 Protection
2 Volume_Encoder A Input for main volume up/down. Volume encoder up/down
3 Volume_Encoder B Input for main volume up/down. Volume encoder up/down
4 Remote control Input for remocon data. Remote control input
5 Power Check Input for power down.
6 Reset Input for resetting the CPU
7 FLMD0 Flash memory programming mode setting
8 V_REC Output for "Video REC ON/OFF"
9 T_REC Output for "Tape REC ON/OFF"
10 REGC
11 GND GND
12 VDD +5V power supply
Pin Name Opeation Description
Input for detecting
"PROTECTION" condition.
Connecting regulator output stabilization
capacitance for internal operation.
Protect in (High → Power off)
AC CORD ON/OFF CHECK
(LOW=AC CORD OFF)
Assign
I
I
I
I
I
I
I
O
O
I
13 NC
14 Tuned Input for detecting "TUNED" condition. Tuned signal in (Low=Tuned OK)
15 L-MUTE Output for Front L/R MUTE
16 ST/BY LED Output to drive standby LED
17 NC open
FLT B+
18
ST_BY RLY
19 LC75343_CE Output for chip enable of LC75343 IC
20 PLL_CE Tuner PLL Chip enable
21 FLT_CE Driver IC Chip enable
22 LC75343_CLK Output for clock of LC75343 IC
23 LC75343_DATA Output for data of LC75343 IC
24 PLL_DO & FLT_DO Tuner PLL & Driver IC Data out
25 PLL_DI Tuner PLL Data in
26 PLL_CLK & FLT_CLK Tuner PLL Clock & Driver IC Data out
27 AVREF
Output for "power relay & FLT ON/OFF" Output for "power relay & FLT ON/OFF" O
Reference voltage.
(Connected to +5V, Not VDD.)
I
O
O
O
O
O
O
O
O
I
O
28 GND GND GND
29 KEY1 Data input for key scan.
KEY1 Data input for key scan.
30
I
I
1. Electrical specification.
Local OSC
Frequency cover range
Standard supply voltage
FM Antenna Impedance
AM Loop Antenna
2. Electrical Characteristics.
AF Output Level
Auto Stop Level
Stereo Separation 1kHz
AF Output Level
Auto Stop Level
3. Adjust Point.
98.1 60
75 ohm unbalance
40
FM
47 Load
98.1 60
MW
47kΩkΩ Load
999 74
--
30 180 ±60
280±100 mV
25 ±6 dBu
1-3
1-4
No.
9.5uH ( 1kHz ) : S0160BL-25
12 +/-0.5V
Above the receiving Frequency
M W F M
522 ~1620kHz 87.5 ~ 108.0MHz
ITEMS
SPECIFICATION
1-1
kHz,%dBu
TEST
CONDITION
T.P.
1-5
Adjustment
1-2
SVR01
UNITSpecification
No.
Non Adjust
98.1 --
TEST ITEMS
MOD.T.L.
dBu999
SVR02
Non Adjust30 55 ±15
25 min dB
mV Non Adjust
TUNER ALIGNMENT
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