NAD T753, Service Manual

Page: 49 / 80

49
AT24C16
KEYBOARD: U210
SDA VSS
SCL
WC
VCC
/ E2
M24Cxx
1
2
3
4
8
7
6
5
/ E2 / E2 / E2 NC
/ E1
/ E1 / E1 / NC NC
/ E0
/ E0 / NC / NC NC
/1Kb
/2Kb /4Kb /8Kb 16Kb
74HCU04
DIGITAL BOARD: U1201 & U1202
1A
1Y
2A
2Y
3A
3Y
GND
1
2
3
4
5
6
7
14
13
12
11
10
9
8
6A
V
CC
6Y
5A
5Y
4A
4Y
74HC251
DIGITAL BOARD: U1203
PIN4 D0
W PIN6
Y PIN5
PIN8 GND
PIN16 VCC
PIN7 STROBE
S0
PIN3 D1
S1
PIN2 D2
S2
PIN1 D3
S3
PIN15 D4
S4
PIN14 D5
S5
PIN13 D6
S6
PIN12 D7
PIN11 A
PIN10 B
PIN9 C
S7
S0
S0
S1
S1
S2
S2
S3
S3
S4
S4
S5
S5
S6
S6
S7
S7
TCM810
KEYBOARD: U214
VCC
RESET**(RESET)
GND
TCM809 xENB
TCM810 xENB
1
2
3
*3-P in SOT-23B
NOTE: *3-Pin SOT-23B is equivalent to JEDEC TO-236
** () is for TCM810