Sherwood RX-4109B/B Service Manual page 6

3. Pin Functions
Pin Name
Pin No.
1 Protection
2 Volume_Encoder A
3 Volume_Encoder B
4 Remote control
5 Power Check
6 Reset
7 FLMD0
8 V_REC
9 T_REC
10 REGC
11 GND
12 VDD
13 NC
14 Tuned
15 L-MUTE
16 ST/BY LED
17 NC
FLT B+
18
ST_BY RLY
19 LC75343_CE
20 PLL_CE
21 FLT_CE
22 LC75343_CLK
23 LC75343_DATA
24 PLL_DO & FLT_DO
25 PLL_DI
26 PLL_CLK & FLT_CLK
27 AVREF
28 GND
29 KEY1
30 KEY1
Opeation
Input for detecting
"PROTECTION" condition.
Input for main volume up/down.
Input for main volume up/down.
Input for remocon data.
Input for power down.
Input for resetting the CPU
Flash memory programming mode setting
Output for "Video REC ON/OFF"
Output for "Tape REC ON/OFF"
Connecting regulator output stabilization
capacitance for internal operation.
GND
+5V power supply
Input for detecting "TUNED" condition.
Output for Front L/R MUTE
Output to drive standby LED
open
Output for "power relay & FLT ON/OFF"
Output for chip enable of LC75343 IC
Output for clock of LC75343 IC
Output for data of LC75343 IC
Reference voltage.
(Connected to +5V, Not VDD.)
GND
Data input for key scan.
Data input for key scan.
Description
Protect in (High → Power off)
Volume encoder up/down
Volume encoder up/down
Remote control input
AC CORD ON/OFF CHECK
(LOW=AC CORD OFF)
Tuned signal in (Low=Tuned OK)
Output for "power relay & FLT ON/OFF"
Tuner PLL Chip enable
Driver IC Chip enable
Tuner PLL & Driver IC Data out
Tuner PLL Data in
Tuner PLL Clock & Driver IC Data out
GND
Assign
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O
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