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Chapter 6 General
6.4.4.2 Printer Diag
(1) ESS Diag
This section describes how to perform each test of the ESS Diag in detail.
- Executing ESS diagnosis
1) Turn off the power.
2) Turn on the power while holding down "" and "" keys.
3) Release the fingers from these keys when "the message" is displayed.
4) The "Service Mode", "Printer" and "FAX/Scanner" are displayed. (Entered the Diag. Mode.)
5) Press "OK" key. (Entered the Printer Diag. mode.)
6) Press "OK" key. (Entered the ESS Diag. mode.)
7) Press "" and "" key to select the test item.
8) Press "OK" key twice to execute the test.
Do not turn off the power when the ESS Diag is executing.
- FlashROM Test
Calculates the Flash ROM checksum and compares it with the value stored in the Flash ROM.
Execute this test when the 016-500, 016-501 and 016-502 errors occurred.
Test result: NG(Go to FIP.) OK(Turn off/ on the main power.)
- EEPROM Test
Performs write/read/verify on the diag. area of the EEPROM.
Execute this test when the 116-323 and 116-390 errors occurred.
Test result: NG(Go to FIP.) OK(Turn off/ on the main power.)
The test performs read/write/verify of the test patterns (0xff, 0xaa, 0x55 and 0x00) on one byte at
every 0x400 from the first address of EEPROM.
- DRAM Test
Tests OPEN/SHORT with the address line of the DRAM.
Performs write/read/verify on the entire DRAM.
Execute this test when the 116-315, 116-316 and 116-320 error occurred.
Test result: NG(Go to FIP.) OK(Turn off/ on the main power.)
When the optional DRAM SIMM is checked and found, it checkes the optional memory area
First, the test performs read/write/verify of the increment data for the whole tested area by the
word. Then, it performs read/write/verify of the test patterns (0xffffffff, 0xaaaaaaaa, 0x55555555,
0x00000000) for the whole tested area by the word.
- ASIC Test
ASIC Register check.
Executes this test when the 116-343 error occurred.
Test result: NG (Go to FIP.) OK (Turn off/on the main power.)
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