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Self-Diagnosis and Test Mode
This unit is provided with a "self-diagnosis and self-recovery func-
tion" which detects DSP errors and automatically recovers the unit,
and a test mode for performing operation checks during repairs.
1. MAIN FUNCTIONS
• DSP self-diagnosis program for servicing and operation check
mode.
2. ENTERING THE TEST MODE
While pressing the MODE button and AUDIO FUNCTION <
button simultaneously in the power OFF state, press the POWER
button.
3. Self-diagnosis Mode for Servicing/Display of DSP
Errors
3-1. Self-diagnosis Mode for Servicing
Before entering the test mode, DSP self-diagnosis program for ser-
vicing will be run.
• When an error is detected:
The error message is displayed on the fluorescent display tube.
When several errors occur at the same time, only the last error
detected will be displayed.
• When no error is detected:
First, "DSP ERROR" will be displayed, then "DSP NO ERROR"
will be displayed, and the operation check mode will be set.
Table-1:
Error Message/Fluo-
rescent Display Tube
When a DSP error is detected, after this dis-
DSP ERROR
play, the contents of "3-2. Display of DSP Op-
erations" will be displayed.
3-2. Display of DSP Operations
Display of error
1 DSP BOOT
1
Mostly due to faulty connection (soldering) between
2
ERROR
DSP and microprocessor
2 DSP HREQ
1
Faulty DSP clock (X3501 and onwards), faulty DSP
2
part, etc.
ERROR
3 DSP VRFY
1
Overrunning of DSP due to heat, microprocessor
2
ERROR
bugging, or IC3409 (DIGITAL board PLL) is faulty
4 DSP 1 RPLY
Faulty DSP part, or faulty microprocessor part, etc.
SECTION 4
TEST MODE
Possible Reasons
Possible cause
— 27 —
4. OPERATION CHECK MODE
Outputs the Lch LD/DVD OPTICAL signal to the FRONT Lch,
REAR Lch, CENTER, and the Rch to the FRONT Rch, REAR Rch,
and CENTER.
5. NOTE AFTER USING THE TEST MODE
Be sure to unplug the AC plug after the test mode is performed.
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