|
61
|
TROUBLESHOOTING GUIDE
KX-F680BX/KX-F2681BX
CH1 5V/div
CH2 5V/div
CH3 5V/div
CH4 5V/div
W1 500ns/div
Length 100
W2 5
µ
s/div
Length 1k
Sampling
Normal
20Msps
Marker 1
T -13.75
µ
s
V 5.0 V
Marker 2
T 7.50
µ
s
V 0.2 V
T 21.25
µ
s
1/ T
47.06k Hz
V -4.8 V
Time
Time Base
Roll
Off
Time Base
External
Internal
Internal
-40.0V
-17.75
µ
s
-12.75
µ
s
Time/div
10.0V
H1 W1
A0
D0
ROMCS
RD
OK
W1
500ns
W2
5µs
Position
W1
-17.75µs
W2
-24.80µs
CH1 5V/div
CH2 5V/div
CH3 5V/div
CH4 5V/div
W1 500ns/div
Length 100
W2 5
µ
s/div
Length 1k
Sampling
Normal
20Msps
Marker 1
T -13.75
µ
s
V 5.0 V
Marker 2
T 7.50
µ
s
V 0.2 V
T 21.25
µ
s
1/ T
47.06kHz
V -4.8 V
W1
500ns
W2
5µs
Position
W1
7.25µs
W2
25.00µs
Time
Time Base
Roll
Off
Time Base
External
Internal
Internal
-40.0V
7.25
µ
s
12.25
µ
s
Time/div
10.0V
H1 W1
A0
D0
ROMCS
RD
OK
Let's observe the wave form to fix the defective IC.
Please observe A0, D0, ROMCE, RD by using digital oscilloscope.
Below graph show you the wave form that is observed when unit
(board) is working correctly. Both graph are good wave. Wave
form is rapidly changing by one (like below graph). Because many
kind of data or program are rapidly executed,
so you can see some kind of wave forms that is seem to below
graph.
A0
: pin 132 of ASIC (IC1)
D0
: pin 131 of ASIC (IC1)
ROMCE
: pin 22 of ROM (IC2)
RD
: pin 24 of ROM (IC2)
SRAMCS:
: pin 20 of SRAM(IC3)
MDMCS
: pin 52 of MODEM(IC5)
name
location
Summary of Contents for KX-F680BX
Page 1: ......
Page 11: ......
Page 106: ......
Page 107: ......
Page 108: ......
Page 109: ......
Page 110: ......
Page 111: ......
Page 112: ......
Page 113: ......
Page 114: ......
Page 115: ......
Page 116: ......
Page 117: ......
Page 118: ......
Page 119: ......
Page 120: ......
Page 121: ......
Page 122: ......
Page 123: ......
Page 124: ......
Page 125: ......
Page 126: ......
Page 127: ......
Page 128: ......
Page 129: ......
Page 130: ... 165 KX F680BX KX F2681BX EC1 EC2 EC3 EC4 EC5 EC6 EC7 EC9 EC10 EC11 EC12 EC13 EC8 TOOLS ...
Page 131: ......
Page 133: ......
Page 134: ......
Page 135: ......
Page 136: ......