DIAGNOSTICS
Test Points and LEDs
10DEC05
DG4825-1
Page
170 of 180
Table 18
Test Points on the DIGITIZER BOARD A3
TP
Description
Expected Signal
1
+24 V DC power
22.5 - 25.5 V DC
2
Ground
0 V DC
3
+5 V DC power
4.9 - 5.1 V DC
5
GALVO CLOCK
Approximately 342 kHz during scanning
6
Ground
0 V DC
7
“Line Start Signal” connects to “line
done” on GALVO BOARD A4
High pulse approximately every 13 ms
during scanning
8
“Convert Start Not”
Pulses low for every pixel pulse.
200 kHz during scanning.
9
Ground
0 V DC
10
FFWR (FIFO WRITE)
One pulse for each pixel during scanning
11
FFRD (FIFO READ)
One pulse for each pixel during transfer
12
FFRST (FIFO RESET)
One pulse for each pixel before transfer of
image
13
BYTSEL (BYTE SELECT)
One pulse for each pixel for each high and
low byte
14
PIXSEL
Not used
