Output Expander (Ic1803, Tc74Lcx574Ft) Port Functions; Output Expander (Ic1804, Tc74Lcx574Ft) Port Functions; Lamp Cpu (Ic4811, Pic16F88) Port Functions - Canon LV-X4U Service Manual

2.6 Output Expander (IC1803, TC74LCX574FT) Port Functions

Pin No. Name Function Name
1 OE IO_ENB
2 D0 D0
3 D1 D1
4 D2 D2
5 D3 D3
6 D4 D4
7 D5 D5
8 D6 D6
9 D7 D7
10 GND GND
11 CK ADD1_CS
12 Q7 --
13 Q6 --
14 Q5 --
15 Q4 LAMPDC_ON
16 Q3 DC_ON
17 Q2 ON_3.3V
18 Q1 FAN_SW2
19 Q0 FAN_SW1
20 Vdd Power Supply +3.3V

2.7 Output Expander (IC1804, TC74LCX574FT) Port Functions

Pin No. Name Function Name
1 OE IO_ENB
2 D8 D8
3 D9 D9
4 D10 D10
5 D11 D11
6 D12 D12
7 D13 D13
8 D14 D14
9 D15 D15
10 GND GND
11 CK ADD1_CS
12 Q7 MUTE
13 Q6 CG-FILT
14 Q5 FILT_480P/575P
15 Q4 CABLE_SW
16 Q3 PC/AV_SW
17 Q2 S/CV_SW
18 Q1 MONIT_OUT
19 Q0 PC1/PC2_SW
20 Vdd Power Supply +3.3V

2.8 LAMP CPU (IC4811, PIC16F88) Port Functions

Pin No. Name
1 RA2/AN2/CVREF/VREF-
2 RA3/AN3/VREF+/C1OUT
3 RA4/AN4/T0CKI/C2OUT
4 RA5/MCLR/Vpp
5 Vss
6 AVss
7 RB0/INT/CCP1
8 RB1/SDI/SDA
9 RB2/SDO/RX/DT
10 RB3/PGM/CCP1
11 RB4/SCK/SCL
12 RB5/SS/TX/CK
13 RB6/AN5/PGC/T1OSO
14 RB7/AN6/PGD/T1OSI
15 AVDD
16 VDD
17 RA6/OSC2/CLKO
18 RA7/OSC1/CLKI
19 RA0/AN0
20 RA1/AN1
Function
Output Port Chip Select
Drives Lamp Ballast Unit
Drives 15.5V Power Supply
Drives 3.3V Power Supply
Not used
Drives FAN_B, FAN_C Power Supply
-
Function
Output Port Chip Select
Mute Output
Filter-on at RGB signal
Filter-on at 480p/575p signal
Long cable switch (Service mode No.57)
PC/AV Mode switch
S-Video/Video switch
PC2 Monitor out Mode
PC1/PC2 Mode switch
Function Name Function
LAMP_ERR Lamp Error Output
RESET
GND
GND
LAMP_ON Lamp ON/OFF signal
SDA
RX_LAMP Lamp Status Signal
Not used
SCL
TX_LAMP Control and Sync signal
RB6_PIC Service
RB7_PIC Service
AVDD Power Supply +5V
VDD Power Supply +5V
CLKO
CLKI
LAMP_PWM APL Level Input
LAMP_SW Lamp_SW Input
4-13
Part 4: Troubleshooting
Polarity I/O
Enable = L
Power-on=H
Power-on=H
Power-on=H
Power-on=H
Polarity I/O
Enable = L
Mute-on=H
Long cable=H
PC=H
S-Video=L
PC2 MONITOR=H
PC1=L
Polarity I/O
Lamp Error = H
lamp ON = L
Eco = H, Normal = L
Lamp-ON and Fan OK = H
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