I have been having problems using a J-Link ARM and connecting to a LPC2138 on custom hardware. See previous post ([ANSWERED]Connecting to LPC2138 w/ J-Link ARM Pro) for details. However I have found the solution to this problem. The LPC2138 JTAG pins can be multiplexed with GPIO pins. After reset the LPC2138 will sample the RTCK pin and if this is low the JTAG pins will be used as JTAG, otherwise they will be used as GPIO pins. I'm not sure if the reset strategy in software can account for this by bring RTCK low while releasing the device from reset of if there needs to be documentation added that a pull down is needed for this pin.
Connecting to LPC2138 w/ J-Link ARM Solution
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