DEBUG MODE-3
TX-NR906/NA906
Trouble Shooting by DSP DEBUG MODE (Continued)
Digit no
on FL
DSP setting is failured.
Continue to display “26” to
“2F”
Continue to display “22” to
“24”
Continue to display “30” to
“33”
DSP Sequence is no good.
Connection from DIR to DSP is no good.
Interface between DSP and MPU
is no good.
Interface between DSP and MPU
is no good.
Communication between DSP and MPU
is no good.
Writing from MPU to DSP is no good.
This identifies IC which
outputs error
10
Continue to display “1”
Continue to display “03”
Continue to display “05”
Display “21”, then return and
signal format indicator is
flashing
Continue to display “08” to
“0C”
Continue to display “2”
Continue to display “3” to ”7”
Continue to display “8” to ”F”
Check -
15
20
items.
27
28
-
15
20
-
Symptom on FL display
Cause of trouble
Remedy
14
13
Displayed audio encoding
format is different from input
signal.
Input signal to DSP is no good.
a. No input signal to DSP.
"x" is displayed
b. Interface between DSP and MPU is
no good.
1. Confirm where the digital waveform stops
between DIR and DSP by oscilloscope.
2. Q3311, P3801 may relate.
3. Resolder pins of the bad part or replace it with
new one.
The same as above.
1. Confirm where the digital waveform stops
between MPU and DSP by oscilloscope.
2. P3101, P3802 or P6851 may relate.
3. Resolder pins of the bad part or replace it with
new one.
The IC outputs error to MPU.
Replace the IC chip.
DSP is impossible to replace, so replace with
a new pcb.
13
The same remedy as .
14
The same remedy as -b.
14
The same remedy as -b.
2. Check the voltage of the power supply pin of DSP.
3. Check the reset port and clock input of DSP by
oscilloscope, and find out bad part.
4. Flash ROM firmware is no good. Update.
5. DSP or MPU is broken. Replace MPU.
DSP is impossible to replace, so replace with
a new pcb.
1. Flash ROM firmware is no good, update.
2. Check DSPSDO pin of MPU by oscilloscope.
If no signal, find out bad part connected.
3. Flash ROM or SDRAM is no good, replace.
4. DSP or MPU is broken, replace the same method
as above 5.
14
1. The same remedy as -b.
1. Flash ROM firmware is no good, update.
2. Flash ROM or SDRAM is broken, replace.
DSP program does not run properly.
Flash ROM or SDRAM is no good.
Initialize the unit.
(Press ON/STANDBY button while pushing
VCR/DVR button when the unit is powered on.)
The unit was powered off during DSP
firmware updating.
1. Flash ROM firmware is no good, upgrade.
2. Flash ROM or SDRAM is broken, replace.
DSP program does not run properly.
Flash ROM or SDRAM is no good.
1. Flash ROM program is no good, upgrade.
2. Flash ROM or SDRAM is broken, replace.
3. Check DSP drive clock freq. by oscilloscope.
If no signal, find out bad part connected.
4. Check audio clock to DSP by oscilloscope.
If no signal, find out bad part connected.
DSP program does not run properly,
or audio clock to DSP is no good.
DSP program does not run properly,
or audio clock to DSP is no good.
The same as above.
1. Flash ROM firmware is no good, upgrade.
2. Flash ROM or SDRAM is broken, replace.
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