IBM 4247-003 Maintenance Manual - Page 156

Reference Table 7, Network Server Problems - NPS and LAN Attachment Card Symptom Probable Cause Action Network light flashes Incorrect ring speed rapidly after power on self selected test on external Token Ring NPS (all models) Select correct token ring speed. Power off the NPS unit and try again. NPS Server or LAN card Network problem will not communicate with host 1. Have the customer "ping" the printer to verify communications. 2. Have the customer verify host and print server configuration. Including IP address, gateway address, and subnet mask. 3. Have the customer check physical network cabling. NPS Server or LAN card Data stream problem communicates with host but printer does not print 1. Have the customer check print job stream. 2. Take a data trace of the attachment and contact support. Note: The term "ping" means to send a signal in anticipation of a return response. The return response indicates that the printer and the host are communicating. Reference Table 8, Power Supply Connector Pins and Voltages Table 22. Voltages Pin Voltage Range Pin 1 N/A Pin 2 −5 V dc −5.2 / −4.8 V dc Pin 3 +5 V dc +4.8 / +5.2 V dc Pin 4 +5 V dc +4.8 / +5.2 V dc Pin 5 +5 V dc +4.8 / +5.2 V dc Pin 6 Ground Chapter 1. Diagnosing Problems 156