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. Enlargement At the receipt side, the logo is also printed and the receipt is issued. 3 Check that: The print is free from contamination, blur, and uneven density. 4 End of testing The test will end automatically. 4) KEYBOARD TEST 1 Key operation _ _ _ _104 3 CA/AT 2 KEY check sum code 2 Test procedure The keyboard is checked using the sum check code of the key code. If the sum check code is not entered, the check is made using the sum check code of the default keyboard arrangement The sum check data for each model is entered to the front 4 digits of the DIAG code, and that data is compared with the key data added until the final key (CA/AT) is pressed. Both data are the same, the test ends, printing the number given below. If both data are different, the printer prints the error message. OP display KEY BOARD SRV 104 KEY CODE 3 4 Check: A) The content of completion print End of testing When the test ends normally: When an error occurs: E – ~ – 104 104 Note: Calculation of key sum check data Hard codes (hexadecimal number) at the position (excluding feed key) where there is an input data contact are added. However, the end key (TL) is not added. This data to which hard codes have been added is converted into a decimal number value, which will become the sum check data that will be entered when DIAG is started. MODE: SRV_PGM2_PGM1_OFF_OP X/Z_REG_MGR_X1/Z1_X2/Z2__SRV X :01 293 456 7 The above X must be read in the correct order. (If the contact is open, 9 will be displayed.) 3 Check: The display during testing and the content of the completion print. 4 End of testing When the test ends normally 105 When an error occurs: E – ~ – 105 6) PRINTER SENSOR TEST 1 Key operation 106 3 CA/AT 2 Test procedure Check the status of the paper end sensor and head up sensor. OP display R/J SENSOR SRV 106 X Y 3 Check the following. X: 1 - Paper present at the receipt side O - No paper at the receipt side Y: 1 - Paper present at the journal side O - No paper at the journal side 4 End of testing You can exit the test mode by pressing any key and the printer prints the following. 106 ER-A520U/ER-A530U DIAGNOSTIC PROGRAM – 16 – 7) CLOCK TEST 9) DRAWER 2 OPEN & SENSOR TEST 1 Key operation 1 Key operation 107 3 CA/AT 111 3 CA/AT 2 Test procedure 2 Test procedure OP display TIM CHECK SRV 107ER OP display DRAWER 2 SRV X Hour Min. Sec. Blinks at an interval of 0.5 sec. 3 Check that: “–“ blinks and the clock counts up. 4 End of testing When any key is pressed, the date and time are printed and the test mode will be terminated. XXXXXX XXXXXX 107 year month hour min. day sec. 8) DRAWER 1 OPEN & SENSOR TEST 1 Key operation 110 3 CA/AT 2 Test procedure OP display DRAWER 1 SRV X X : O = DRAWER OPENED C = DRAWER CLOSED 3 Check that: A) The drawer 1 opens normally. B) The sensor correctly indicates the status of the drawer 1. 4 End of testing You can exit the test mode by pressing any key. The printer prints the following. 110 X : O = DRAWER OPENED C = DRAWER CLOSED 3 Check that: A) The drawer 2 opens normally. B) The sensor correctly indicates the status of the drawer 2. 4 End of testing You can exit the test mode by pressing any key. The printer prints the following. 111 10) LCD CG TEST 1 Key operation 116 3 CA/AT 2 Test procedure To check the display CG, 256 pieces of built-in CG's are grouped into 16 blocks and each 16 characters is displayed on the dot display. At first, CG code of 00H ~ 0FH is displayed. By pressing any key, each block is displayed in sequence. OP display XY SRV "O" indicates the CG display position. "XY" indicates the code at the head of each block in hexadecimal number. (Example: 10, A0) 3 Check that: A) Displays are clear. B) Free from blur, chip-off, unevenness. 4 End of testing You can exit the test mode by pressing any key. The printer prints the following. 116 ER-A520U/ER-A530U DIAGNOSTIC PROGRAM – 17 – 11) STANDARD RAM TEST 1 Key operation 120 3 CA/AT 2 The standard RAM is checked. The contents of memory must be the same before and after this test. RAM (100000H~1FFFFFH area) is tested in the following procedure: a) Store data in the test areas b) Write “00H” c) Read and compare “00H” and then write”55H” d) Read and compare “55H” and then write “AAH” e) Read and compare “AAH” f) Restore stored data If an error occurs at a step, the error is printed. If any error does not occur, the following addresses are checked in turns. Addresses to be checked: 300000H, 300001H, 300002H, 300004H, 300008H, 300010H, 300020H, 300040H, 300080H, 300100H, 300200H, 300400H, 300800H, 301000H, 302000H, 304000H, 308000H, 310000H, 320000H, 340000H, 380000H, OP display RAM SRV 120 12) OPTION RAM TEST 1 Key operation 121 3 CA/AT 2 The standard RAM is checked. The test program tests internal RAM (10 Kbytes) of the CPU. The contents of memory must be stored before and after this test. RAM (00400H ~ 02BFFH area) is tested in the following procedure. a) Store data in the test area. b) Write “00H” c) Read and compare “00H” and then write “55H” d...

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