Service manual

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MD-R2
52 P42/A18 In/Output SYS D2 (data bus 2)
53 P41/A17 In/Output SYS D1 (data bus 1)
54 P40/A16 In/Output SYS D0 (data bus 0)
55* P37/A15 Output Not used
56* P36/A14 Output Not used
57* P35/A13 Output Not used
58 P34/A12 Output EEPRO (EEPROM protection cancel)
59 P33/A11 Output EPCS (EEPROM chip selector output)
60 P32/A10 In/Output EEPD (EEPROM sirial data output)
61 P31A9 Output EEPK (EEPROM sirial colck output)
62 Vcc Input + 3.15V
63* P30/A8 Output Not used
64 Vss — GND
65* P27/A7 Output L3 DATA (soft serial communication, 2 modes provided, LSB fast)
66* P26/A6 Output L3 MODE (soft serial communication, 2 modes provided, LSB fast)
67* P25/A5 Output L3 CLK (soft serial communication, 2 modes provided, LSB fast)
68* P24/A4 Output Not used
69* P23/A3 Output Not used
70 P22/A2 Output PCNT0 output
71* P21/A1 Output Not used
72 P20/A0 Output LDON output (H: ON)
73 P17/D15 Output ANLPTR output
74* P16/D14 Output ADPON output (for CK)
75* P15/D13 Output DAPON output (for CK)
76 P14/D12 Output DFS0 output
77 P13/D11 Output DFS1 output
78* P12/D10 Output DIG EX output (for CK)
79* P11/D9 Output DIG CD output (for CK)
80 P10/D8 Output XRST (system reset output)
81* P07/D7 Output AD MUTE output (for CK)
82* P06/D6 Output EMPHA output (for CK)
83* P05/D5 Output DA MUTE output (for CK)
84 P04/D4 Output MUTE output
85* P03/D3 Output DOUTM output (for CK)
86 P02/D2 Input TEST2 (special mode selection 2)
87 P01/D1 Input TEST1 (special mode selection 1)
88 P00/D0 Input TEST0 (special mode selection 0)
89 P107/AN7/KI3 Input AVCK3 (special mode monitor input)
90 P106/AN6/KI2 Input AVCK2 (AD/DA section 3.1V monitor input)
91 P105/AN5/KI1 Input AVCK1 (DOUT section 5V monitor input)
92 P104/AN4/KI0 Input DTEMP (temperature detection input)
93 P103/AN3 Input MINF (disc type/REC input)
94 P102/AN2 Input TEST K1 (test key input 1)
95 P101/AN1 Input TEST K2 (test key input 2)
96 AVss — GND
97 P100/AN0 Input HINF (mechanism position/HEAD position)
98 VREF — + 3.15V
99 AVcc — + 3.15V
100 P97/ADTRG Input Connect +B
IC1401 RX-iX0232AWZZ:MD System Microcomputer (IX0232AW) (2/2)
Pin No.
Terminal Name
Function
In this unit, the terminal with asterisk mark (*) is (open) terminal which is not connected to the outside.
Input/Output