Instruction manual

NGA 2000 MLT Hardware
TEST PROCEDURE / TEST POINTS
11 - 8
Emerson Process Management GmbH & Co. OHG
Instruction Manual
90002929
07/2006
A
A
C
B
A
11.3.1 Inspection of LEDs on component side of DSP01
Fig. 11-6: LEDs on component side of PCB "DSP01”
If you presume any malfunction of DSP01 pcb, first step is to check out correct activity / status of the LEDs
on component side of the pcb.
In the picture above, all elements that have to be inspected are marked in yellow. .
Check out status of the LEDs in areas A,B and C as described below.
Please note, that independent from an agreeing status of the LEDs with this description, furtheron a
number of soldering pads (please see following pages) are to be inspected, before any failure of DSP01
can be determined.
On the right you see the LEDs that are
to be inspected in area A in enlarged
depiction.
During operation, LEDs V7 (CH3) and
V9 (CH4) must be flashing, if a detec-
tor is employed on the appropriate de-
tector connection.
In case that the concerning channel is
not used, status of the appropriate LED
does not matter.
Correct status during operation dis-
plays correct function of synchroniza-
tion (lock display).
Fig. 11-6a: LEDs “V7” and “V9” (PCB "DSP01”)
TROUBLESHOOTING INSTRUCTIONS FOR PCB DSP01