Pioneer MEP-7000, Руководство по обслуживанию

Страница: 66 / 286

66
MEP-7000
1 2 3 4
A
B
C
D
E
F
1 2 3 4
Check if the following audio data
from the AUDIO DSP (IC501) are
output from the SOUTH CPU
(IC202):
(Ach)BFDATLA/BFDATRA
(Bch)BFDATLB/BFDATRB
Check that the cables that
connect the SMAI
N and SJACK
Assys and S W power supply unit
and SJACK Assy are securely
connected and if there is break-
age in the cables.
If a connection is loose, firmly connect the
cables.
If there is breakage, replace the Cable.
N either an analog nor digital audio signal is output.
Analog audio signals for both the A and B channels are not output.
1 - Cable
Check the following input signals
and voltage to the DAC
(IC506/IC507) :
• V+5A
• DACRST
• DAC_SPICLK
• DAC_SPIOUT
• DLRCK
• DBCLK
• DAC_16M • If V+5A is not supplied, go to [4].
• If no signal is input to DACRST#, go to [5].
• If no signal is input to DAC_SPICLK or
DAC_SPIOUT, go to [6].
• If no signal is input to DLRCK or DBCLK, go
to [7].
• If no clock signal is input to DAC_16M, go to
[ 8 ].
3 SMAI N ASSY
Check if the protectors (P10 and
P11) are damaged. If power is not supplied to the audio filter
(IC10/IC11), no audio signal is output. If the
protectors are damaged, replace them.
2 - SJACK ASSY
Check the voltage (V+ 8N D) input
to the regulator IC (IC555).
If power is supplied, check the mounting status
of the regulator IC (IC555) and its peripheral
devices. If they are properly mounted, they are
defective; replace them.
4 - SMAI N ASSY
Check if DACRST# signal is
output from AUDIO DSP (IC501). If no signal is output, check the mounting
status of AUDIO DSP (IC501). If it is properly
mounted, the port connector may be defective;
replace the AUDIO DSP (IC501).
If a signal is output, check the mounting status
of the level shift (IC506). If it is properly
mounted, it is defective; replace it.
5 - SMAI N ASSY
If the DLRCK and DBCLK signals
are not input, check if a signal is
output from the AUDIO DSP
(IC501). If no signal is output, check the mounting
status of the AUDIO DSP (IC501). If it is
properly mounted, the port connector may be
defective; replace it.
If no signal is output, check the mounting
status of the SOUTH CPU (IC202). If it is
properly mounted, the port connector may be
defective; replace it.
Check the mounting status of
IC559 from which the DAC_16M
clock signal is output. If the mounting status of IC559 is OK, that IC
may be defective; replace it.
7 - SMAI N ASSY
8 SMAI N ASSY
No. Waveform Items for check Causes and measures Points to be checked
[5-1] No sound
1 SMAI N ASSY
35
1 8 ,19
Check if the SPICLK and
SPIOUT signals are input to the
Level Shift (IC505) and the DAC
SPICLK and DACSPIOUT
signals are output. Check the mounting status of the level shift
(IC505). If it is properly mounted, the port
connector may be defective; replace it.
6 SMAI N ASSY 10~13
10~13,
15
[5] DRIVE UNIT
General problems other than those of the DVD/CD drives are described here.
For details on problems of the DVD/CD drives, see “[6] SRV 1/2 DRIVE.”