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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)
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