Earth Magnetism Canceling Functional Operation Error; Key Operation Error - NEC DPro2070SB Service Manual

3.3.5 Earth Magnetism Canceling Functional Operation Error

Check the connection of CN2S0 on the
SENSOR PWB and CN104 on the MAIN PWB.
NG
OK
Check the voltage at Pins 28 and 29 of IC102.
No voltage fluctuation seen
Voltage fluctuation seen

3.3.6 Key Operation Error

Check voltages with operation keys.
NG
OK
MPU operation error (See Item 3.4.8)
Check with CN2S0 is connected to CN104
Confirm that the voltage at Pin 22 and 23 of IC102 on the MAIN PWB are
as specified in the table below when the operation key is pressed.
Voltage at Pins 22 and 23 of IC102 during key operation
Pin No./Terminal name
EXIT (SW101) ON
3 (SW102) ON
4 (SW103) ON
- (SW104) ON
+ (SW105) ON
SEL (SW106) ON
RESET (SW107) ON
Expected failure point
SW101-SW107, R10A-R10G, R10K, R10L or peripheral circuits
Expected failure point
IC2S0 on the SENSOR PWB
Expected failure point
IC102 on the MAIN PWB
Pin 23/KEY1
5V
3.65V
5V
5V
1.69V
5V
0V
3-17
Pin 22/KEY2
3.65V
5V
1.6V
2.38V
5V
0V
5V