Sherwood R-772 Service Manual page 17

Pin No. Symbol
50 NJW1197_MUTE
51 OSD_DATA
52 OSD_CLK
53 OSD_CE
54 TA1270_SCL
55 TA1270_SDA
56 BU2090_CLK
57 BU2090_DATA
58 C_DET
59 SV_DET
60 COMP_DET
61 COMP_MUTE
62 VCC2
63 NC
64 VSS
65 SUBMICOM_PDN
66 SUBMICOM_RST
67 NC
68 NC
69 TUNED
70 NC
71 TUNER_DO
72 PLL_CLK
73 MAIN_IRQ
74 SUB_IRQ
75 RDS_CLK
76 RDS_DATA
77 PLL_DATA
78 PLL_CE
79 M24C16_SCLK
80 M24C16_SDA
81 FUNC_DOWN
82 FUNC_UP
83 VOL. UP
84 VOL. DOWN
85 ST/BY_LED
86 FL_SW
87 NC
88 NC
89 POWER DOWN
90 KEY1
91 KEY2
92 KEY3
93 STEP_OPTION
94 SET_OPTION
95 PROTECTION
96 AVSS
97 NC
98 VREF
99 AVCC
100 SUB_DATAIN
MUTE signal output for NJW1197.
Data signal output for LC74781
Clock signal output for LC74781
Output for chip enable of LC74781
Serial data clock signal output for "TA1270BF"
Serial data signal output for "TA1270BF"
Clock signal output for BU2090
Data signal output for BU2090
Input for detecting "Composite-Video input" condition(At "L", it is active)
Input for detecting "S-Video input" condition(At "L", it is active)
Input for detecting "Component Video input" condition(At "L", it is active)
Output for COMP-VIDEO output mute(At "H", it is active)
+3.3V power supply
Not used!
Ground
Output PDN DATA for submicom.
Output RST DATA for submicom.
Not used!
Not used!
Input for detecting "TUNED" condition(At "L", it is active)
Not used!
Data Input from PLL IC
Clock signal output to PLL IC
Clock signal input from RDS IC.
Input for RDS data from RDS IC.
Data output to PLL IC
Output for chip enable of PLL IC
Clock signal output for M24C16.
Input/output for M24C16.
Input for main function down.
Input for main function up.
Input for main volume up.
Input for main volume down.
Output to drive STAND-BY LED(At "H", it is active)
Output to "FL_B+ ON/OFF" (At "H", it is active)
Not used!
Not used!
Input for power down.
Data input for key1 scan.
Data input for key2 scan.
Data input for key3 scan.
Input for selecting the frequency ranges steps of FM and AM
Input for selecting the model option.
Input for detecting "PROTECTION" condition
Ground
Not used!
Reference voltage(Connected to +3.3V, Not VDD)
+3.3V power supply.
Serial data signal Input from submicom
16
Description