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KX-F910BX
(1) CHECKING DETAIL
Checking soldering
Big ICs and resistor arry
IC1
RA1, RA2
IC3
RA3, RA4
IC11
Checking soldering
SYS. CLK (pin 96 of IC1) 12 MHz?
(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.
Check soldering
(Refer to page 67)
OSC wave form.
(Refer to page 59)
Check wave form on the
ICs and BUS line.
(Refer to page 60)
Replace IC.
| 58 |
Visual check soldering.
OK
5V
CPUCLK
OV
XTEST
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