Table of Contents
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2-1. Normal Diagnostic Function (Power
ON Test)
This unit executes the tests below automatically when
turning the power ON.
1. ROM (IC103 on the CP-364 board) test
(Error : "E0")
This performs a ROM checksum test.
The "E0" display blinks on the 7SEG LED and the
operation stops when an error occurs. Replace the
ROM.
2. RAM (IC104 on the CP-364 board) test
(Error : "E1")
This performs a RAM read/write test (in which cycle
data "00" through "FF", "FF" and "00" are written
and read for comparison).
The "E1" display blinks on the 7SEG LED and the
operation stops when an error occurs. Replace the
RAM.
3. NV-RAM (IC201, 203 on the CP-364 board) test
(Error : "E2")
This performs an NV-RAM read/write test (in which
data "FF" and "00" are written and read for compari-
son). But the data of the memory does not change.
The "E2" display blinks on the 7SEG LED and the
operation stops when an error occurs. Replace the
NV-RAM.
4. NV-RAM (IC201, 203 on the CP-364 board)
checksum test (Error : "E3")
This performs an NV-RAM checksum test.
The "E3" display blinks on the 7SEG LED and the
operation stops when an error occurs. Replace the
NV-RAM.
5. Switch short test (Error : "EE")
This test confirms that a switch is not short-circuited.
If the switch is short-circuited, the LED of the switch
blinks and the "EE" display blinks on the 7SEG LED
and the operation stops. Replace the short-circuited
switch.
HKDV-900
Section 2
Troubleshooting
2-2. Self Diagnostic Mode
This unit allows executing the nine self diagnostic tests
below. (Refer to Section 2-2-3, "Starting and Quitting of
the Self Diagnostic Mode".)
1. ROM version display
Displays the current ROM version on the 7SEG LED.
2. ROM test
Performs a ROM checksum test to check the memory
operation.
3. RAM test
Performs a RAM read/write test to check the memory
operation.
4. NV-RAM test
Performs an NV-RAM read/write test to check the
memory operation.
5. LED test
Checks that all the LEDs light.
6. 7SEG LED test
Performs a 7SEG LED light test to check the decoding
operation for numeric display.
7. Switch test
Checks the operation of a pushbutton switch.
8. Rotary encoder test
Checks the operation of a rotary encoder.
9. RS-422A test
Performs an RS-422A loop-back test to check the
communication operation.
2-1 (E)
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Table of Contents
Troubleshooting
