McIntosh C2500 Service Manual page 13

3 CONTROL
751457 SCH 2 of 5
J4 :1
NC USB+
J4 :2
NC USB-
J4 :3
NC TCK
J4 :4
NC
TMS
J4 :5
NC TDO
J4 :6
NC TDI
J4 :7
NC NRST
J4 :8
NC
3.3V BU
J4 :9
J4:10
NC
J4:11
J4:12
NC EXT_RXD
J4:13
NC EXT_TXD
2 -15V
J2 :1
2
J2 :2
2 15V
J2 :3
2
J2 :4
2
VFD SDA
J2 :5
2 INPUT_B
J2 :6
2
VFD CE
J2 :7
2 INPUT_A
J2 :8
2 VFD SCL
J2 :9
2 ADC-VREF
J2 :1 0
2 VFD 5V
J2 :1 1
2
LEFT PB AD
J2 :1 2
2 VFD 5V
J2 :1 3
2 3.3V
J2 :1 4
2
J2 :1 5
8
2
3.3V BU VCC(B)
J2 :1 6
7
SCLB
6
2
J2 :1 7 SDAB
5
EN
2
J2 :1 8
NetTie 1
J7-12 2 FRONT_IR
J5 :1
2 3.3V
J5 :2
2 VOL_A
J5 :3
2
RIGHT PB AD
J5 :4
2 5V
J5 :5
2
ADC-VREF
J5 :6
2 5V
J5 :7
2 ON/RESET
J5 :8
2 VOL_B
J5 :9
2 3.3V BU
J5 :1 0
S P 1
2
Spare
J5 :1 1
J7-1 2
J5 :1 2
TUBE PREAMPLIFIER
C4 .1UF
3.3V BU
U21
3.3V BU
1
4 VCC
ALL_DATA
GND 2 U22
3.3V BU 3.3V BU
Active high output,
1
to Data Drivers U24 VCC
1 4
VCC
4 2
Data Out GND
No Data
2
GND
IR_CTL
3V to 5V VFD Translators
U4
1
B+
R233 22.1 4
VFD CE
2
U5
GND
1
B+
R234 22.1
4
VFD SCL
2
GND U23
1
B+
R235 22.1
4
VFD SDA
2
GND
U3 2
1
VCC(A) 3.3V BU
R24 6 0
2
SCLA I2C_SCL
3 R24 7 0
SDAA I2C_SDA
4
GND
MANUAL RESET
Push and hold Front Panel Standby/On button for 5 Sec.
ON-W AKEUP
Low power wakeup
R135
C66 .1UF
475K U26
U25
133724
1 1
ON/RESET VCC VCC
4
2 2
GND GND
R137 47.5K R138 D22
C68 10uF
LVC,AND GATE
100
21
C2500
Converted
IR_DATA_OUT
Data Out No Data
No Data
IR_REAR Data Signal
No Data
FRONT_IR
Data Signal
C53 .01uF
C54
VDD-CORE-R
5V
1
ADC-VREF ADVREF
VF_CE
2
GND
R101 0 3
LEFT PB AD AD4
R103 0 4
SPI_SCL
RIGHT PB AD AD5
R104 0 5
AD6
R106 0 6
AD7
SPI_SDA 7
+3V-Atmel VDDIN
8
VDD-CORE-R VDDOUT
R110 22.1 9
IR_CTL PA17/PGMD5/AD0
R111 22.1 10
IR_DATA_OUT PA18/PGMD6/AD1
R112 22.1 11
DAC_RXD PA21/PGMD9
12
VDD-CORE-R VDDCORE
R115 22.1 13
LIGHTS OFF
LIGHT_CTL_IN PA19/PGMD7/AD2
ON
R117 22.1
14
R228 DAC_TXD PA22/PGMD10
R119 22.1 15
+3V-Atmel TONE_CE TONE_CE PA23/PGMD11
R121 22.1 16
OPEN
FRONT_IR PA20/PGMD8/AD3
3.3V BU
Keep trace short
C67 .1UF
NRST
U27
133724
1
R136 10K
VCC
4 4 1
Q4
2
GND
Place near Micro
VDD-CORE-R
256kbit MEMORY
U20
1
AO VCC
2
A1
R96
1.5K 3
Y1
A2
1 2
4
GND
1000pF
O P E N
R99
48
S pare
PA0/PGMEN0
47 R10 0
PA1/PGMEN1 S pare
46
O P E N
GND
45
Connect pin 55 to 3.3V to Erase micro VDDIO +3V-Atmel
44 R105 22.1
PA2/PGMEN2 VOL_SDA
Main Atmel Micro 43 R107 22.1
PA3 I2C_SDA
U3
42 R108 22.1
Use "64 Pin Via" footprint. PA30 IR_REAR
41 R109 22.1
(1.8V Out)
PA29 VOL_SCL
40
TST
5V Tolerant I/O's Internal Pull-up Keep trace short
39
NRST
38 R11 3 O P E N
PA28 FR_SDA
37 R11 4 O P E N
(1.8V)
PA27/PGMD15 FR_SCL
R116 22.1
36
PA4/PGMNCMD I2C_SCL
R11 8 O P E N
35
PA5/PGMRDY Spare1
34 R120 22.1
PA6/PGMNOE AUD DET
33
TDI TDI
L12
1 2
+3V-Atmel
ADC-VREF
Pin 7 Pin 18 Pin 45 Pin 58/59 Pin 18
Pin 1
22
8
3.3V BU
7
W P
6
SCL I2C_SCL
5
SDA I2C_SDA
R102 10K
SW1
PROG
3.3V BU
NRST
SW2
RESET