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KX-F680BX/KX-F2681BX
(1) CHECKING DETAIL
(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?
Please check the soldering first, it comes from our experience.
Replace IC.
Check wave form on the
ICs and BUS line.
(Refer to page 60)
OSC wave form.
(Refer to page 59)
OK
5V
CPUCLK
0V
XTEST
Checking soldering
Big ICs and resistor arry
IC1
RA1, RA2
IC3
RA3, RA4
IC4
IC5
IC6
Checking soldering
SYS. CLK (pin 96 of IC1) 12 MHz?
Visual check soldering.
Check soldering.
(Refer to page 67)
Summary of Contents for KX-F680BX
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Page 130: ... 165 KX F680BX KX F2681BX EC1 EC2 EC3 EC4 EC5 EC6 EC7 EC9 EC10 EC11 EC12 EC13 EC8 TOOLS ...
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