Shure U4D Service Manual page 8

Display Board Interconnect with Rf-Audio Board
Circuit Description
Shure U4D Dual Diversity UHF Receiver
Integrated ribbon cable connector P102 interfaces with the rf-audio
board and the networking Interface board through the display board. Pin
assignments for the P102 connector are presented in the table below.
P102 Interconnect Pin Assignments
PIN NO. SIGNAL NAME
1 D+5V
2 DLOW_BATT
3 DSQUELCH
4 GND
5 DLE
6 DRSSI_CH_A
7 DD
8 DLEDA
9 DCK
10 DLEDRET
11 DRSSI_CH_B
12 DLEdB
13 DAUDMTR
14 N141
15 DSCL
16 N142
17 DLONE_W_OUT
18 N143
19 DSDO
20 DLONE_W_INT
7
Table 1
DESCRIPTION
+5V power supply to the Digital Board
Analog voltage representing TX battery level
Data signal to U215 squelch D/A
Input power ground to the Digital Board
Data Load Enable to U309 PLL Synthesizer
Chan. A rf Received Signal Strength Indicator
Data signal to U309 PLL Synthesizer
Diversity LED A drive signal input
Clock signal to U309 PLL Synthesizer
Diversity LED A and B common return
Chan. B rf Received Signal Strength Indicator
Diversity LED B drive signal input
Audio metering analog signal input
Audio potentiometer return to the Audio Board
Clock signal to U215 squelch D/A
Audio potentiometer wiper to the Audio Board
Interrupt output to the Networking Interface
Audio potentiometer input from the Audio Board
Networking Serial Data Output
Interrupt input from the Networking Interface
25D1062 (AG)