Hach 1950Plus - Page 126

Page 126
Mirror Assembly Adjustment
UVTOCMaintenance.fm
Section 7
Figure 51 UV Lamp Test points on the Display/Controller PCB
1. Display/Controller PCB 9. TP4—IR Voltage 0.25V–4.75V (at sea level only)
2. Contrast Adjustment 10. LK5—LK8 - IN
3. LK1—IR Range Selection (OUT=0–1000 ppm,
IN=0–10000 ppm)
11. TP2—Source Voltage 1.7V
4. Zero and Span Adjustment 12. Adjustment for source voltage to 1.7V
5. TP3—Analog Ground (∅V) 13. LK4—OUT (Stepper Inputs)
6. LK2—IN - AGC Setup 14. TP6—Digital 0V
7. TP1—INT Output 15. LK3—EPROM, Software versions 4v0 or higher
only IN
8. TP5—SIG IN (Input Signal from IR bench
MAINTENANCE RS-232
MAINTENANCE RS-232
CON 2
ZERO SPAN
GNDA
TP3
INT
TP1
TP2
SRC
TP6
DIG
GND
DIG
GND
TP5
SIG IN
TP4
SIG
LK 3
LK1
LK5 LK6 LK7 LK8
LK2
SOURCE
CONTRAST
LK4
121315
14
11
4523
8
9
10
7
1
6