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

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.
Item Setting
+5 V TX (8 NM)
+12 V ST-BY
-22 V ST-BY
-6 V ST-BY

3.2 Scanner unit

Adjusters on MD board in the scanner unit are adjusted as below.
Item Setting
+12 V ST-BY
+8 V
ST-BY
heater volt.
TX-HV
ST-BY
(divided)
Magnetron
TX
current

Chapter 3 Adjustment

DANGER- High voltage
Table 3-1 Test points of Display unit
Test point
TP4 (+), TP5 (-)
J1#7 (+), J1#5 (-)
J1#10 (+), J1#5 (-)
J1#9 (+), J1#5 (-)
DU Board
(03P9320)
Fig.3-1 Location of J1 and J8 on DU board
Table 3-2 Test points of Scanner unit
Test point
TP804#3 (+)
TP804#4 (-)
TP804#6 (+)
TP804#4 (-)
TP804#7 (+)
TP804#4 (-)
TP804#5 (+)
TP804#4 (-)
Ratings
4.95 to 5.05 Vdc
11.2 to 12.4 Vdc
-22.9 to -20.7 Vdc
-6.0 to -5.0 Vdc
J8 J1
TP2
Rating
11.9 to 12.1 Vdc
7.8 to 8.2 Vdc
8.5 to 9.35 V
Long 3.05 to 3.15 V
Short 3.35 to 3.45 V
13
Adjuster
VR1
Adjuster
VR801
VR851
VR852