Drive Unit - Pioneer MEP-7000 Service Manual

1

[5] DRIVE UNIT

A
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."
[5-1] No sound
No. Points to be checked
Neither an analog nor digital audio signal is output.
1 SMAIN ASSY
B
Analog audio signals for both the A and B channels are not output.
1 Cable
2 SJACK ASSY
C
3 SMAIN ASSY
4 SMAIN ASSY
D
5 SMAIN ASSY
6 SMAIN ASSY
E
7 SMAIN ASSY
8 SMAIN ASSY
F
66
1
2
Waveform Items for check
Check if the following audio data
from the AUDIO DSP (IC501) are
output from the SOUTH CPU
18,19
(IC202):
(Ach)BFDATLA/BFDATRA
(Bch)BFDATLB/BFDATRB
Check that the cables that
connect the SMAIN and SJACK
Assys and SW power supply unit
-
and SJACK Assy are securely
connected and if there is break-
age in the cables.
Check if the protectors (P10 and
- P11) are damaged.
Check the following input signals
and voltage to the DAC
(IC506/IC507) :
• V+5A
10~13,
• DACRST
• DAC_SPICLK
15
• DAC_SPIOUT
• DLRCK
• DBCLK
• DAC_16M
Check the voltage (V+8ND) input
to the regulator IC (IC555).
-
Check if DACRST# signal is
output from AUDIO DSP (IC501).
-
Check if the SPICLK and
SPIOUT signals are input to the
10~13
Level Shift (IC505) and the DAC
SPICLK and DACSPIOUT
signals are output.
If the DLRCK and DBCLK signals
are not input, check if a signal is
-
output from the AUDIO DSP
(IC501).
Check the mounting status of
35 IC559 from which the DAC_16M
clock signal is output.
MEP-7000
2
3
Causes and measures
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.
If a connection is loose, firmly connect the
cables.
If there is breakage, replace the Cable.
If power is not supplied to the audio filter
(IC10/IC11), no audio signal is output. If the
protectors are damaged, replace them.
• 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].
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.
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.
Check the mounting status of the level shift
(IC505). If it is properly mounted, the port
connector may be defective; replace it.
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 the mounting status of IC559 is OK, that IC
may be defective; replace it.
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4
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