UBI EasyCoder 501 SA, Руководство по обслуживанию

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UBI EasyCoder 501 – Service Manual
134
17.8
Testing the CPU Board
17. CPU BOARD, cont'd.
At power-up, the printer automatically performs a series of tests in
the following order:
1. MCS TEST
• RAM checksums are checked.
• RAM memory is cleared, partially or completely:
– all of RAM memory, if a checksum error occurs
– part of RAM memory, if checksums are OK.
• Devices are scanned.
• DMA is reset.
• Printer type is tested by shifting through printhead to check head
width (number of dots).
• Edit variables are reset.
• Print variables are reset.
• Cutter is tested (rotated one cycle to home position).
2. UBI FINGERPRINT TEST
• Power-up setup:
- Devices are opened and initiated (”uart1:”, "uart2:”, "uart3:",
"centronics:", "console:")
- Different parts of the setup are checked. If OK, do the setup:
Contrast setup: Print contrast is set
Serial comm. setup: All uart's are initiated
Service setup: Label limits are set
Paper type is set
Image buffer size is set
Head resistance is measured
1
Sizes of receive and transmit
buffers are set
Detection setup: Start and stop adjust are set
If any part of the setup is lost, the message “Setup lost – Press any
key” will be displayed and the program waits for a key to be
pressed. When a key is pressed, the printer will be set up with
default setup values.
• UBI Fingerprint memory is initiated.
• If the cutter is not in home position, a new attempt to perform a
cut cycle will be performed.
• UBI Fingerprint variables are initiated.
1 /. The measurement of head resistance
can fail if:
- The type of printer cannot be detected.
Then the minimum resistance values will
be used which may result in a weak
printout.
-The reference resistance does not stabi-
lize inside allowed limits.