Question Regarding E4418B

[CrazyTiger]

I bought a E4418B from ebay recently, it was stated dead/no display, I figured it was likely a power supply problem. ( I was wrong)
Once I received it, power up the unit, the LCD was flickering but nothing.
Opening up the unit, i found the horror, some idiot tried repairing the units motherboard, it was a terrible job, the IC's were installed crooked, the lithium battery had an "upgrade" to support CR2032 Battery, all the FETs had one leg lifted off.

The "upgrade"



First thing i rectified all the solder joints, and replaced the crooked logic ICs and op-amps to new one.
Then turned ON the unit, still i had only LCD flickering, going further in, I found the SRAM was dead, after replacing it, the unit spring back to life. 



Now I have a question, never had a E4418B before, in the system info menu, its stating E4418A and I noticed my unit have a LAN port, but I dont see anywhere where to set the IP, is this because the unit is seeing itself as "A" Unit? If yes how do I set back the unit to be a "B" model.
I see i can set the serial number, will do that after new battery arrives, not sure if the serial number plays a role in instrument  identification.

[testpoint1]

please check the firmware chip sticker, the 4418B version is different as 4418A.

[CrazyTiger]

The flash chip indicates:
E4418 80020 ad 80019 (High and Low), And U14 is labelled e4418 80022. Did not see any other label.

Did I end up with a canablized unit, with E4418A motherboard on a E4418b body?

[CrazyTiger]

Problem solved, it was something to do with an old Agilent Circular, since i notice i could not find a section on the power meter to configure serial port as well, i started to look for that solution, where I came across a circular by Agilent.

Here is the note: http://literature.cdn.keysight.com/litweb/pdf/E4418B-09.pdf

The moment I set the processor version, the unit detected as E4418B and Serial Port Settings were available, Now I have a fully working E4418B 

Remark: Turns Out E4418B does not have a Ethernet/Lan capability, but they used a RJ-45 Connector as a TTL Output, I mistook the port as LXI enabled unit 

[View[+]Finder]

https://support.keysight.com/KeysightdCX/s/knowledge-article-detail?language=en_US&keyid=How-do-I-restore-missing-RS-232-interface-soft-key-and-functionality-on-legacy-EPM-E4418B-and-E4419B-power-meters

That is the current link to restore functionality of E4418B