Sherwood RX-4109B/B, Service Manual

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