Pioneer DJM-850-K Service Manual page 28

1
A
[3-3] No signal is output from the PHONES connector.
No. Cause Diagnostics Point
0 Prior
CUE button / LEVEL
Confirmation knob / MIXING knob
/ MONO, STEREO
selector
1 Loose connection MAIN Assy /
/defective parts SEC/HP Assy /
HPJK Assy
2 Loose connection SEC/HP Assy
/defective parts CN101 pin 1, pin 4
4-1
3 Loose connection SEC/HP Assy
B
/defective parts HP_L+/L-
HP_R+/R-
4 Loose connection
SEC/HP Assy
/defective parts MUTE
C
5 Loose connection MAIN Assy
/defective parts IC1001
pin 9, 10, 11, 12
6 Loose connection
MAIN Assy
/defective parts IC1001 pin 3
7 Loose connection MAIN Assy
/defective parts IC1001 pin 5
8 Loose connection MAIN Assy
/defective parts 96k CLK: IC1001 pin 4
1-81
6M CLK: IC1001 pin 2
1-82
D
24M CLK: IC1001 pin 1
1-83
[3-4] No signal is output from the DIGITAL MASTER OUT connector.
No. Cause Diagnostics Point
1 Loose connection MAIN Assy
/defective parts IC3405 pin 16
2 Loose connection MAIN Assy
/defective parts C3411
E
3 Loose connection MAIN Assy
/defective parts R3434
4 Loose connection MAIN Assy
/defective parts IC3405
FPGASRC_LRCK
pin 24
FPGASRC_BCK
pin 26
F
ADAT_DOUT_FPGASRC
pin 28
FPGASRC_MCLK
pin 30
28
1
2
Item to be Checked
Confirm on the screen that the selector
is set properly.
Check for the connection between the
MAIN Assy, SEC/HP Assy and
HPJK Assy.
Check for the signals at Pins 1 and 4 of
CN101.
Check the audio signal of SEC/HP Assy.
[Checking the MUTE]
Check that the MUTE signal
4-2
the range of approx. –14 to –15 V.
[Checking the DAC]
Check the output signal of DAC (IC1001).
1-78
[Checking the DAC]
Check the input signal of DAC.
1-79
[Checking the DAC]
Check the RESET signal of DAC.
1-80
[Checking the DAC]
Check the CLK signal of DAC.
Item to be Checked
Check for the signal at Pins 16 of DIT
(IC3405).
1-84
Check for the V+3R3D_DIT power.
1-85
Check that the DIT_RESET signal level
is High.
1-86
Check for the any signals of DIT
(IC3405).
1-87
1-88
1-89
1-90
2
3
Corrective Action
—————
Correct any power connections.
• If a signal is found, the HPJK Assy or wires
are defective. Replace them.
• If no signal is found, go to [3].
• Check for a part where the signal is interrupted,
by observing the audio signal before and after
each block. Soldering of the part or the part itself
where the signal is interrupted is defective. Or the
MUTE circuit is activated.
• If the MUTE circuited is activated, go to [4].
• If no signal is found at CN3, go to [5].
• If the signal is within the range of approx. –14 to
4-2 is within –15 V, soldering of the MUTE transistors (Q103,
Q104) or any part in their peripheral circuits is
defective or one or more of those parts is defective.
• If the signal is outside the range of approx. –14 to
–15 V, check the conduction at CN3 and CN1005
and check the above-mentioned MUTE
transistors. If they are OK, go to 3-1 [17].
• If the DAC output signal is normal, check the
conduction at CN3 and CN1005.
• If no DAC signal is found, go to [6].
• If no signal is found, DSP (IC3201) must be
improperly soldered or defective.
• If signal is found, go to [7].
• If it is H, go to [8].
• If it is H, go to 2-2 [5].
• If no signal is found, go to 2-2 [6].
• If CLK signal is found, DAC (IC1001) must be
improperly soldered or defective.
Corrective Action
• If the signal can be found, soldering of any
part in the signal path from IC3405 to JA3401
may be defective. Check the soldering status.
If soldering is OK, replace the defective part.
• If no signal is found, go to [2].
• If V+3R3D_DIT power is found, go to [3].
• If V+3R3D_DIT power cannot be found,
soldering of any part in the power path may be
defective. Check the soldering status. If
soldering is OK, replace the defective part.
• If it is H, go to [4].
• If the signal level is L, soldering of any part in
the DIT_RESET path may be defective. Check
the soldering status. If soldering is OK, replace
the defective part.
• If any signal is abnormal, soldering of any part
in the signal path may be defective. Check the
soldering status. If soldering is OK, replace the
defective part.
• If all signals are normal, soldering of the DIT
(IC3405) or the IC itself may be defective.
Check the soldering status. If soldering is OK,
replace the defective part.
DJM-850-K
3
4
Reference
Operating
instructions
—————
10.35 WAVEFORMS
4-1
—————
—————
10.35 WAVEFORMS
1-78
10.35 WAVEFORMS
1-79
—————
10.35 WAVEFORMS
1-81 1-82 1-83
Reference
10.35 WAVEFORMS
1-84
4.4 POWER
BLOCK DIAGRAM
5.3 INFORMATION
ON POWER
DIAGNOSTICS
—————
10.35 WAVEFORMS
1-87 1-88 1-89 1-90
4