13
TROUBLESHOOTING
12
u-COM PIN DESCRIPTION
1. POWER CIRCUIT
Pin No.
Pin Name
Type
Connection
Short Description
76
RESET B
IN/OUT
RESET INPUT SIGNAL
77
IORW
IN/OUT
78
NET_INT
IN/OUT
79
IN/OUT
80
CS
IN/OUT
81
nAVR_RD
IN/OUT
READ ENABLE SIGNAL OUTPUT
82
nAVR_WR
IN/OUT
WRITE ENABLE SIGNAL OUTPUT
83
SW TRIG
IN/OUT
EXTRA TRIGGER INPUT
84
P3000_IRQ
IN/OUT
85
ALARM IN 3
IN
ALARM SIGNAL INPUT
86
87
88
AMP VSS
IN
AMP VSS
89
90
91
AMP Vrefout
OUT
ANALOG AMPLIFIER’S REFERENCE VOLTAGE OUTPUT
92
AMP Vrefin
IN
ANALOG AMPLIFIER’S REFERENCE VOLTAGE INPUT
93
C
IN
CAPACITOR CONNECTION PIN
94
95
96
97
98
AMP VCC
IN
ANALOG AMPLIFIER’S POWER SOURCE INPUT
99
Avcc
IN
REFERENCE VOLTAGE INPUT
100
HDD DETECT
IN/OUT
FRAME ADVANCE BREAKE ADJUST VOLTAGE INPUT
No output voltage of Power Circuit.
Check the DC Adapter
Check the 2 pin in the P912
Check the 30,31pin
in the P902
Replace the DC Adapter
Replace the P912
Replace the P902 or Check
the pattern in Rear Board.
Replace the L802
NO
YES
YES
NO
Replace the F801 or wait
for 1min,because this fuse
type is a PTC.
NO
Check the pattern from C820(+)
to each power IC s input.
NO
NO
Check the F801
YES
Check the L802
YES
Check 18,19,20,21 pin
In the IC801,IC802,IC803
YES
Check 12V Output at L801
YES
Check 6V Output at L811
Check 3.3V Output at L831
NO
Summary of Contents for DX-N111N
Page 12: ...20 SCHEMATICS 1 CONNECTION DIAGRAM 3 0 COMBO...
Page 13: ...21 SCHEMATICS 2 BLOCK DIAGRAM...
Page 14: ...22 SCHEMATICS 3 FRONT SCHEMATIC DIAGRAM S A 3 0 COMBO...
Page 15: ...23 CIRCUIT DIAGRAM 4 JACK SCHEMATIC DIAGRAM...
Page 16: ...24 CIRCUIT DIAGRAM 5 POWER SCHEMATIC DIAGRAM...
Page 17: ...25 6 SYSCON SCHEMATIC DIAGRAM CIRCUIT DIAGRAM...
Page 18: ...26 CIRCUIT DIAGRAM 7 VIDEO AUDIO SCHEMATIC DIAGRAM...
Page 19: ...27 CIRCUIT DIAGRAM 8 CODEC SCHEMATIC DIAGRAM...
Page 20: ...28 COMPONENTS LOCATION GUIDE ON PCB BOTTOM VIEW 1 1 VCR MAIN...
Page 21: ...29 COMPONENTS LOCATION GUIDE ON PCB BOTTOM VIEW 1 2 POWER...
