M8SL2-00-002-812 T854 Fault Finding C5.7
© Copyright Tait Electronics Limited August 2004. All rights reserved.
5.7 Fault Finding Charts
Note: The standard test point designations used in this section are as follows:
TP601 13.8V
TP602 9V
TP603 20V
TP604 5V
5.7.1 Microcontroller (IC810)
5.7.1.1 Basic Checks
Pulsing
Check state
of pin 35.
Y
Is pin 30
pulsing?
High or open circuit
Y
Static high/low
Check state of
pins 36 to 43.
Low/floating
High
Is the 12.8MHz clock
present on IC810 pin 21
(microcontroller)?
N
Replace
IC810.
*digital storage oscilloscope
Replace IC810.
Check the
state of
pin 10.
N Pulsing
Low
Replace
IC810.
Use a DSO* to check
operation of IC650
(i.e. active high
pulse at power up).
Replace
IC650.
Correct the fault causing
pin 35 to be low/floating.
Check IC710.
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