Pioneer DJM-850-K, Руководство по обслуживанию

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27
DJM-850-K
5 6 7 8
5 6 7 8
A
B
C
D
E
F
[Checking the MASTER_MUTE]
Check that the MASTER_MUTE signal
is within the range of approx. –14 to –15
V .
[Checking the MUTE]
Check that the MUTE signal is
within the range of approx. –14 to –15
V .
2 Loose connection
/defective parts MAI N Assy
IC601 pin 3
[Checking the DAC]
Check the input signal of DAC (IC601). • If no signal is found, DSP (IC3201) must be
improperly soldered or defective.
• If a signal is found, go to [3]. 10.35 W A V EFORMS
3 Loose connection
/defective parts MAI N Assy
IC601 pin 5
[Checking the DAC]
Check the RESET signal of DAC. • If it is L, go to [5].
• If it is H, go to [4]. —————
4 Loose connection
/defective parts MAI N Assy
96k CLK: IC601 pin 4
6M CLK: IC601 pin 2
24M CLK: IC601 pin 1
[Checking the DAC]
Check the CLK signal of DAC. • If no signal is found, go to [6].
• If a CLK signal is found, IC601 must be
improperly soldered or defective. 10.35 W A V EFORMS
5 Loose connection
/defective parts MAI N Assy
IC2 8 04 pin 4, pin 6
[Checking the RESET signal path]
Check the RESET signal. • If a signal level at Pin 4 is H and that at
Pin 6 is L, IC2
8 04 must be improperly
soldered or defective.
• If the signal level at Pin 4 is L and there is no
abnormality in the path from the MAI
N UCOM
(IC2 8 03) to IC2 8 04, soldering of the MAI N
UCOM (IC2 8 03) or this IC itself is defective.
—————
6 Loose connection
/defective parts MAI N Assy
96k CLK: IC3006
pin 1, pin 3
6M CLK: IC3004
pin 1, pin 3
24M CLK: IC3005
pin 1, pin 3
[Checking the CLK signal path]
Check for the 96k CLK, 6M CLK and
24M CLK signals. • If Pin 1 is normal but a singal is not output
from the Pin 3, IC3006/IC3004/IC3005
must be improperly soldered or defective.
• If Pin 1 is not normal and if there is no
abnormality in the path from the FPGA
(IC3007) to IC3006/IC3004/IC3005, soldering
of the FPGA (IC3007) or this IC itself is
defective. 10.35 W A V EFORMS
1-72
1-72
1-73
1-74
1-75
1-75 1-76 1-77
1-56 1-57 1-5 8
1-76
1-77
1-55
1-56
1-57
1-5 8
1-73
(SE N D output)
1-72
(SE N DDAC output)
1-72
[3-2] No signal is output from the SEND connector.
1 Loose connection
/defective parts
MAI N Assy
IC602 pin 1, pin 7
IC601 pin 1, pin 7
[Checking the SE N D]
Check the waveform of IC602 output pin.
• If signals are output from Pins 1 and 7 of
IC602, soldering of the output capacitors
(C624, C625), output resistor (R621, R622) is
defective or one or more of those parts is
defective. Or the MUTE circuited is activated.
• If the MUTE circuited is activated, go to [17].
• If signals are output from the DAC (Pins 1 and
7 of IC601) but not from Pins 1 and 7 of IC602,
soldering of the IC601 and IC602 block or
some part in the block is defective.
• If no signal is output from the DAC (Pins 10,
and 11 of IC601), go to [2]. 10.35 W A V EFORMS
1-6 8
1-70 1-70
1-69
1-6 8
15 Loose connection
/defective parts MAI N Assy
MASTER_MUTE
• If the signal is within the range of
approx. –14 to –15
V , go to [17].
• If the signal is outside the range of
approx. –14 to –15
V , go to [16].
—————
16 Loose connection
/defective parts MASTER LE V EL
knob /
MAI
N Assy
C N 1002 pin 4
[Checking the M V R_MUTE]
• Check that the MASTER LE V EL knob is
not set to –
∞
.
• Check the FFC connections with the
P
N LA Assy.
• Check that the M V R_MUTE (C N 1002
pin 4) level is Low.
• If M V R_MUTE (C N 1002 pin 4) is H, V R6607
or IC6605 on the P N LA Assy or peripheral
parts must be improperly soldered or defective.
• If M
V R_MUTE (C N 1002 pin 4) is L, Q203,
Q204 or peripheral parts must be improperly
soldered or defective.
—————
17 Loose connection
/defective parts MAI N Assy
MUTE
• If the signal is within the range of approx. –14
to
–15 V , soldering of the MUTE transistor or
parts in its peripheral circuits is defective or
one or more of those parts is defective.
MUTE transistor • • •
MASTER1: Q305, Q306, Q307, Q30
8
MASTER2: Q401, Q402, Q407, Q40 8
REC: Q405, Q406
BOOTH: Q513, Q514, Q515, Q516, Q509,
Q510, Q511, Q512
SE
N D: Q603, Q604
• If the signal is outside the range of approx. –14
to
–15 V , check if the MUTE transistor is
defective. If the transistor is OK, go to [1 8 ].
—————
1-71
1 8 Loose connection
/defective parts MAI N Assy
IC2 8 03 pin 11
[Checking the CPU_MUTE]
Check that the CPU_MUTE signal level is
High. • If it is L, MAI N UCOM (IC2 8 03) or R2 8 33
must be improperly soldered or defective.
• If it is H, Q201, Q202 and Q205 must be
improperly soldered or defective.
—————
No. Cause Diagnostics Point Item to be Checked Corrective Action Reference
No. Cause Diagnostics Point Item to be Checked Corrective Action Reference