The PAUCam is an optical camera with an array of 18 CCDs (Hamamatsu Photonics K.K.) and up to 45 narrow and
broad band filters. The camera will be installed on the William Herschel Telescope (WHT) in the Canary Islands, Spain.
In order to fulfill with the specifications for the camera readout system, it was necessary to test the different readout
electronics subsystems individually before to integrate the final readout work package, which is composed of 4
MONSOON (NOAO) front-ends, 6 fan out boards (MIX), each one driving up to 5 CCDs signals and a pre-amplification
stage (PREAMP) located inside the cryostat. To get the subsystems integration, it was built a small camera prototype
using the same technology as used in the main camera: a carbon fiber cryostat refrigerated by a cryotiger cooling system
but with capacity to allocate just 2 CCDs, which were readout and re-characterized to measure the electronics
performance as conversion factor or gain, readout noise, stability, linearity, etc. while the cross-talk was measured by
using a spot-light.
The aim of this paper is to review the whole process of assembly, integration and test (AIT) of the readout electronics
work package and present the main results to demonstrate the viability of the proposed systems to be use with the