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Diagnostic Testing and Troubleshooting (2635A)
General Troubleshooting Procedures
5A
5A-7
GND
DTACK
BCLR
BG
BGACK
NC1
BR
HALT
RESET
AVEC
BERR
IPL2
IPL1
IPL0
CLK0
V
DD
V
DD
EXTAL
XTAL
GND
R/W
AS
LDS
UDS
GND
IACK7
IACK6
IACK1
TIN1
TOUT1
TIN2
TOUT2
GND
CD1
CTS3
D0
D1
D2
D3
GND
D4
D5
D6
D7
V
DD
D8
D9
D10
D11
GND
D12
D13
D14
D15
GND
V
DD
A23
A22
A21
A20
GND
A19
A18
A17
A16
V
DD
PB10
PB9
PB8
WDOG
PB11
IAC
RMC
CS3
CS2
GND
CS1
CS0
FC2
FC1
V
DD
FC0
A1
A2
A3
GND
A4
A5
A6
A7
A8
A9
A10
A11
GND
A12
A13
A14
A15
TXD1
TCLK1
RCLK1
VDD
RTS1
RTS3
CD3
BRG1
NC3
BUSW
DISCPU
FRZ
DONE
DACK
DREQ
PA12
GND
TCLK3
RCLK3
TXD3
RXD3
V
DD
SDS2
CD2
RTS2
CTS2
GND
TCLK2
RCLK2
TXD2
RXD2
RXD1
CTS1
A1AU1 MICROPROCESSOR
80 8370 75656055
90
95
100
105
110
45
50
40
35
30
25
125 117151017
A1TP18
A1TP31
A1TP32
A1TP6
A1TP30
A1TP7
A1TP14
A1TP1A1TP3
A1TP12A1TP15
A1TP20
A1TP11A1TP8
A1TP2
A1TP9
A1TP13
A1TP10
A1TP4
A1TP5
s43f.eps
Figure 5A-1. Test Point Locator, Main PCA (A1) (2635A)