Furuno FS-1503 Service Manual page 83

Electrical Shock Hazard:
This equipment contains high voltages which can cause death at several
internal circuits. Any internal adjustment, servicing and repair shall only be
perfomed by qualified service personnel totally familiar with electrical circuits
and servicing of the equipment. A residual charge remains in capacitors and
other devices several minutes after turning off the power.
It is therefore essential to wait at least 3 minutes to allow residual charge to
subside before acceessing the inside of the equipment.
2. Measurement
*Setting
A
B
C
D
E
Board Name
T1 Input
Q4/5: B-GND
C-GND
Q4/5: B-GND
C-GND
Q6/7: B-GND
PA/FIL
C-GND
(05P0667)
Q6/7: B-GND
C-GND
C33 OUT
ANT
J1 #10 (ALC)
U1-1 (Gate)
DANGER
MIC IN: -40 dBm/1500 Hz/600 Ω, 4 MHz/J3E/Power Data 220
PTT ON (No AF signal)
Receiving mode
SSG: 100 dBµV/50 Ω, 4MHz/J3E
MIC IN: -40 dBm/1500 Hz/600 Ω, 4 MHz/J3E/Low Power Data 140
Table 5-3 Measurements (1/2)
Check Points *Setting
A
A
B
A
B
A
A
A
C
Details
Reading
14 Vp-p
2 Vp-p
15 Vp-p
0.68 Vdc
13 Vdc
4 Vp-p
25 Vp-p
0.6 +Vdc
13 Vdc
250 Vp-p
250 -Vp-p
4.2 Vdc
2.3 Vdc
5-14
Remarks
[PA IN]: J4
DRIVE (2SC3133)
PA (2SC3240)
PA OUT
50 Ω Load
ALC CONT
Overvoltage protector
(Input: 13.6 V)