Fuji Xerox DocuPrint CM305 df Service Manual page 733

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.
NOTE
- 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.)
Do not turn off the power when the ESS Diag is executing.
6 – 87
Chapter 6 General