31
DJM-850-K
5
6
7
8
5
6
7
8
A
B
C
D
E
F
5.3 POWER SUPPLY DIAGNOSIS INFORMATION
Observing
Point
Name
Remarks
Normal Voltage
Level
Possible defective point when
a voltage error is generated
Standby State
(Power SW ON)
1
V
+11E_U
N
REG
7.2 to 1
8
MAI
N
UCOM (IC2
8
03), RESET IC (IC2
8
01),
SETUP LED (P
N
LA ASSY)
O
N
2
V
+13D_U
N
REG
9.7 to 17
ALL DIGITAL CIRCUIT
OFF
MAI
N
ASSY
I
N
PUT ASSY
SEC/HP ASSY
REG ASSY
P
N
LA ASSY
P
N
LB ASSY
3
V
+15A
(
V
+15A_*)
14.25 to 15.75
A
N
ALOG AUDIO CIRCUIT
OFF
4
V
-15A
(
V
-15A_*)
-15.75 to -14.25
A
N
ALOG AUDIO CIRCUIT
OFF
5
V
+5A
(
V
+5A_*)
4.7 to 5.4
DAC, ADC
OFF
6
V
+5D
(
V
+5D_*)
4.75 to 5.35
FL, LED, MIDI, DIGITAL OUT,
MAI
N
UCOM (IC2
8
03)
OFF
7
V
+3R3E
(
V
+3R3E_*)
3.2 to 3.4
MAI
N
UCOM (IC2
8
03), RESET IC (IC2
8
01),
SETUP LED (P
N
LA ASSY)
O
N
8
V
+3R3A
(
V
+3R3A_*)
3.2 to 3.4
ADC
OFF
9
V
+3R3D
(
V
+3R3D_*)
3.15 to 3.45
ALL DIGITAL CIRCUIT
OFF
10
V
+3R3D_REFA
(
V
+3R3D_REFA_*)
3.15 to 3.45
MAI
N
UCOM (IC2
8
03)
OFF
11
V
+2R5D
(
V
+2R5D_*)
2.4 to 2.6
USB UCOM (IC2603)
OFF
12
V
+1R2D
(
V
+1R2D_*)
1.1 to 1.2
8
FPGA (IC3007), DSP (IC3201),
USB UCOM (IC2603)
OFF
13
V
+34D
(
V
+34D_*)
31 to 36
FL
OFF
14
V
+5
V
BUS
Power of the connected PC
4.75 to 5.25
USB communication failure
O
N
15
V
+15A
After the polyswitch
14.25 to 15.75
I
N
PUT CIRCUIT
OFF
16
V
-15A
After the polyswitch
-15.75 to -14.25
I
N
PUT CIRCUIT
OFF
17
V
+5D
(
V
+5D_*)
4.75 to 5.35
MIDI OUT
OFF
1
8
V
+15A_U
N
REG
17.6 to 27.
8
A
N
ALOG AUDIO CIRCUIT
OFF
19
V
-15A_U
N
REG
-17.6 to 27.
8
A
N
ALOG AUDIO CIRCUIT
OFF
20
V
+5A_U
N
REG
7.4 to 12.0
DAC, ADC
OFF
21
V
+13D_U
N
REG
9.7 to 17
ALL DIGITAL CIRCUIT
OFF
22
V
+HP_U
N
REG
Before the polyswitch
4.5 to 9.5
HP CIRCUIT
OFF
23
V
+HP_U
N
REG_1
After the polyswitch
4.5 to 9.5
HP CIRCUIT
OFF
24
V
-HP_U
N
REG
-4.5 to -9.5
HP CIRCUIT
OFF
25
V
+15A
14.25 to 15.75
A
N
ALOG AUDIO CIRCUIT
OFF
26
V
-15A
-15.75 to -14.25
A
N
ALOG AUDIO CIRCUIT
OFF
27
V
+5A
4.7 to 5.4
DAC, ADC
OFF
2
8
V
+15A_U
N
REG
17.6 to 27.
8
A
N
ALOG AUDIO CIRCUIT
OFF
29
V
-15A_U
N
REG
-17.6 to 27.
8
A
N
ALOG AUDIO CIRCUIT
OFF
30
V
+5A_U
N
REG
7.4 to 12.0
DAC, ADC
OFF
31
V
+15A
14.25 to 15.75
A
N
ALOG AUDIO CIRCUIT
OFF
32
V
-15A
-15.75 to -14.25
A
N
ALOG AUDIO CIRCUIT
OFF
33
V
+5A
4.7 to 5.4
DAC, ADC
OFF
34
V
+5D_LED
(
V
+5D_LED*)
4.75 to 5.35
FL,LED
OFF
35
V
+3R3E
3.2 to 3.4
SETUP LED
O
N
36
V
+3R3D
(
V
+3R3D_*)
3.15 to 3.45
FL, SUB UCOM (IC6601)
OFF
37
V
+34D
(
V
+34D_*)
31 to 36
FL
OFF
3
8
V
+3R3D_REFA
(
V
+3R3D_REFA_*)
3.15 to 3.45
CH1-4 FADER, CROSS FADER
OFF
39
V
+3R3_REFB
(
V
+3R3D_REFB_*)
3.15 to 3.45
V
R
OFF
40
V
+3R3D_REFA
(
V
+3R3D_REFA_*)
3.15 to 3.45
CROSS FADER
OFF
ex)
V
+15A_* • • • •
V
+15A_O,
V
+15A_I
N
, etc • • •