Brother HL-2400C Service Manual page 119

(30) LCN: MCTL - LDU (20 pins)
Pin No. Signal
1 +5v - R
2 LDREF2
3 LDREF3
4 +5v - 1
5 LDREF1
6 LDREF0
7 LREADY
8 LCONT2
9 LCONT1
10 VIDEO - P
11 VIDEO - N
12 BDT - P
13 BDT - N
14 SGND
15 SGND
16 SCMCLK
17 SCMRDY - N
18 SCMON - N
19 PGND
20 +24v - 1
IV-70