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KX-F910BX
(2) POWER SUPPLY (5V, 24V)
@
With AC power off
Please check Short Circuit of power line.
1. 5V line at CN1 between pin 6 and 4 pin, is it short?
2. 24V line at CN1 between pin 2 and 3 pin, is it short?
A
With AC power on
Please check voltage of power line.
1. 5V line at CN1 between pin 6 and 4 pin is 5V?
2. 24V line at CN1 between pin 2 and 3 pin is 24V?
(1) CHECKING DETAIL
Please check the soldering first, it comes from our experience.
Checking soldering
Check soldering
(Refer to page 67)
Visual check soldering.
OSC wave form.
(Refer to page 59)
Check wave form on the
ICs and BUS line.
(Refer to page 60)
Replace IC.
Checking soldering
SYS. CLK (pin 96 of IC1) 12 MHz?
Big ICs and resistor arry
IC1 RA1, RA2
IC3 RA3, RA4
IC11
5V
OK
OV
XTEST
CPUCLK
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