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Circuit Board Types-ECPU1/ECPU2-Battery Replacement Installing the ECPU Board <br /> 12. Verify Voltage using the procedure in Step 6. <br /> 13. Re-install battery cover and printer door group. <br /> Do not reconnect the Printer Ribbon Cable until you remove power from the TLS system. Doing so <br /> before power is removed, may cause damage to the ECPU or Printer. <br /> 14. If an annual ATG certification is being performed at this time,you can safely remove power to the TLS via the <br /> assigned dedicated circuit breaker so the fail safe procedure or annual certification procedure can be <br /> completed. <br /> 15. If the TLS produces an H8 or"UNRECOVERABLE DATA ERROR" while performing Step 14, please contact <br /> Technical Support for further assistance. <br /> 19 <br />