Testing The Cpu Board - Intermec EasyCoder 501 Service Manual

17.8 Testing the CPU
Board
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
stabilize inside allowed limits.
Intermec EasyCoder 501 – Service Manual Ed. 7
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. 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:
Serial comm. setup:
Service setup:
- Detection setup:
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.
• Intermec Fingerprint memory is initiated.
• If the cutter is not in home position, a new attempt to perform a
cut cycle will be performed.
• Intermec Fingerprint variables are initiated.
Chapter 17 CPU Board
Print contrast is set
All uarts are initiated
Label limits are set
Paper type is set
Image buffer size is set
Head resistance is measured
Sizes of receive and transmit
buffers are set
Start and stop adjust are set
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