Display Test Mode - Pioneer deh-p9450mp Service Manual

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6.4 DISPLAY TEST MODE

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Introduction
The existing retail OEL models are equipped with a test mode, wherein all displays are displayed for the microcomput-
er's test mode. For the this series, however, the display test mode is expanded to include verifications for writing the
flash memory since a flash memory is installed to accommodate the PC link kit.
A
Types of test modes
(1) All displays.
(2) Data address bus connectivity verification and Kanji ROM as well as flash ROM bus lines connectivity verification.
(3) Flash ROM writing verification
Data is written in the flash ROM, and verification is conducted to determine that the writing of the data is conducted
properly.
Operation specification
1. Turning the test mode ON and OFF
The display test mode is turned on by performing a reset start while pressing the 1 and 3 keys. A once only beep
tone will be emitted.
Display when the test mode is ON (first time only)
B
A TEST display image is generated by the internal processing of the microcomputer.
Press the RESET key or turn off the ACC, to turn the display test mode OFF.
2. Switching the display test mode
The type of display test mode can be switched by pressing the BAND key while the display test mode is ON. When a
mode switch is performed, a beep tone will be emitted once.
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All displays
Flash ROM writing verification
It takes about one to two seconds for the system to display the results of the flash ROM writing test.
Examples of data address bus connectivity verification results displays
ROM_DATA_BUS
ROM_ADRS_BUS
FLASH_DATA_BUS
C
FLASH_ADRS_BUS
When an error occurs during a connectivity verification, the "NG" will be displayed.
Examples of flash ROM writing verification displays
Writing data in FLASH memory!
TEMP region is deleted, data is written and data is read.
Examples of flash ROM writing verification results display
FLASH SETUP
FLASH WRITING
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FLASH WRITING DATA
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TEST
Data address bus connectivity verification
OK
OK
OK
OK
OK
OK
OK
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••• Verification of connectivity of Kanji ROM and data bus.
••• Verification of connectivity of Kanji ROM and address bus.
••• Verification of connectivity of flash memory and data bus.
••• Verification of connectivity of flash memory and address bus.
••• Verification of basic operations.
••• Verification of flash data writing operation.
••• Verification of flash data reading operation.
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