Diagnostics Of The Preformatter - Barco Galaxy NH-12 Service Manual

7. Electronic parts and servicing procedures
Image 7-139
Preformatter: rear side
Schematic overview
PREFORMATTER
EID (J400)
Data inputs
RGB, VS, HS
RGB
1 (J100)
2 (J101)
3 (J102)
PWR input
12V (J11)
2V5, 1V8, 1V2
Image 7-141
Preformatter: block diagram
Start sequence
When the projector switches from standby state to active state, first the lamp is lit and then the formatter is powered. If all voltages
are present and good, the POWER GOOD IN is activated (green LED) and configuration of the FPGA (Cyclone) starts. When this
configuration has been finished succesfully, the POWER GOOD OUT is activated and the Texas Instruments FPGAs are getting
configured.

7.13.2 Diagnostics of the preformatter

Measuring voltages
The following voltages can be checked on the formatter board:
• mains power supply: +12V
• derived voltages: 3.3V — 2.5V — 1.8V — 1.2V
102
not configured
LVDS
I2C Altera
CYCLONE2
PROG
PWR OK?
PWR good IN
DC/DC
12V to
Image 7-140
Preformatter: front side
not configured
LVTTL
RGB, VS, HS
RS232 Xilinx
FPGA
reset
loadboot
PWR good OUT
configuration
CPLD FLASH
Data outputs
DATA LVDS + control
DATA R (J1-2)
DATA LVDS + control
DATA G (J3-4)
DATA LVDS + control
DATA B (J5-6)
RAM
PWR output
PWR good
PWR R (J7)
PWR G (J8)
PWR B (J9)
R59770141 GALAXY NH-12 20/02/2008
RGB