H12+ Disassembly
Parts List ................................................................................................................................ 4-1
Opening the Unit .................................................................................................................... 4-2
Keypad Removal ................................................................................................................... 4-4
LCD Removal & Replacement ............................................................................................... 4-5
Digital Board Removal & Replacement ................................................................................. 4-7
Front End Board Removal & Replacement ........................................................................... 4-8
Printed Circuit Boards
Introduction ............................................................................................................................ 5-1
Flow Chart ............................................................................................................................. 5-1
H12+ Front End PC Board Assembly .................................................................................... 5-2
H12+ Front End Block Diagram ............................................................................................. 5-4
H12+ Digital PC Board Assembly .......................................................................................... 5-5
H12+ Digital Board Block Diagram ........................................................................................ 5-7
Testing and Troubleshooting
Introduction ............................................................................................................................ 6-1
Warning ................................................................................................................................. 6-1
Conformance Test ................................................................................................................. 6-1
Safety Test ............................................................................................................................. 6-6
Required Safety Test for Printed Circuit Boards.................................................................... 6-8
Troubleshooting ..................................................................................................................... 6-8
Log File Information
Introduction ............................................................................................................................ 7-1
Power Up Section ............................................................................................................................... 7-1
Mode Section ...................................................................................................................................... 7-2
Fault Section ....................................................................................................................................... 7-3