If “Test” Is Not Displayed While The Test Mode Is Turned On; If The Data Or Address Bus Verification Yields An “Ng” Result; If The Flash Rom Verification Yields An “Ng” Result - Pioneer DEH-P930 Service Manual

If there is even a single error, the following types of messages will be displayed:
(1) An example of a basic operational error
FLASH SETUP
(2) An example of a flash data writing error display
FLASH WRITING
(3) An example of a flash data reading error display
FLASH WRITING DATA
(4) An example of a flash work deletion error display(verification process completed)
FLASH SECTOR ERASE
Cautions
Normal operations are enabled by pressing a key, etc., even if the system is engaged in conducting a display test
mode. Please be aware that the display test mode is merely a mode wherein the display is switched by the BAND key,
and not a special state of the system.
Important Issues:
If a data bus or an address bus error is encountered, during flash ROM verifications, DO NOT PERFORM FLASH ROM
WRITING VERIFICATIONS. Please turn OFF the ACC (since data in any region can be deleted while a writing test is con-
ducted).
Supplimentary Information
If "TEST" is not displayed while the test mode is turned ON:
There may be a problem with communications between the system and the grill, or there may be abnormalities with
the OEL line or OEL itself (if a beep tone is emitted).
If the data or address bus verification yields an "NG" result:
Even if the "BUS NG" is displayed as a result of the data bus verification, it does not necessarily imply that there is an
abnormality within the data bus.
If there is an abnormality with the address bus, the data of a wrong address will be read, resulting in data abnormality.
If the flash ROM verification yields an "NG" result:
The Flash ROM is not accepting the commands in a normal manner, or there is an abnormality with data deletion or
writing operations.
The Flash ROM has a limited life. The guaranteed component life is 10,000 data rewrites. If the component reaches the
end of its life, it appears that an electrostatic buildup will occur and no more "0" can be written in the flash memory.
NG
NG
NG
NG
DEH-P930,P9300,P9350
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