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