Furuno 1715 - Chapter 3 Adjustment; Display Unit; Scanner Unit

Chapter 3 Adjustment
13
DANGER- High voltage
The display unit contains 1 kVAC for LCD backlighting and
the scanner unit 300 VDC for TX.
3.1 Display unit
+5 V is adjusted by VR1 on DU board. See Fig.3-1 for the location of parts.
Table 3-1 Test points of Display unit
Item Setting Test point Ratings Adjuster
+5 V TX (8 NM) TP4 (+), TP5 (-) 4.95 to 5.05 Vdc VR1
+12 V ST-BY J1#7 (+), J1#5 (-) 11.2 to 12.4 Vdc
-22 V ST-BY J1#10 (+), J1#5 (-) -22.9 to -20.7 Vdc
-6 V ST-BY J1#9 (+), J1#5 (-) -6.0 to -5.0 Vdc
Fig.3-1 Location of J1 and J8 on DU board
3.2 Scanner unit
Adjusters on MD board in the scanner unit are adjusted as below.
Table 3-2 Test points of Scanner unit
Item Setting Test point Rating Adjuster
+12 V ST-BY
TP804#3 (+)
TP804#4 (-)
11.9 to 12.1 Vdc VR801
+8 V
heater volt.
ST-BY
TP804#6 (+)
TP804#4 (-)
7.8 to 8.2 Vdc
TX-HV
(divided)
ST-BY
TP804#7 (+)
TP804#4 (-)
8.5 to 9.35 V
Long 3.05 to 3.15 V VR851
Magnetron
current
TX
TP804#5 (+)
TP804#4 (-)
Short 3.35 to 3.45 V VR852
TP2
DU Board
(03P9320)
J8
J1