Furuno FR-2155, Service Manual

Page: 63 / 152

3-7
Location of parts on SPU Board (03P9253)
Test points and Ratings
TP No. Signal Rating Condition
TP1 GND
TP2 GND
TP3 TUNE IND Approx. 1 to 3.2 VDC
TP4 RF VIDEO 3.9 to 4.1 Vpp
TP5 TX TRIG
TP6 SAMPL T
4 V to 12 V, positive, approx. 3.5 to 15 us
S1: approx 2200 Hz,
M1: approx 1100 Hz,
M2: approx 600 Hz,
L : approx 600 Hz,
!
120 NM: approx 500 Hz
TX
(except for maximum
range)
TP7 H SYNC Approx. 64 kHz
TP8 V SYNC Approx. 60 Hz
TP9 TUNE V Approx. 2 V to 32 V TX
TP11 VIDEO Approx. 5 V TX
TP12 VIDEO LEVEL
3.9 to 4.1 Vpp, negative, main bang level
Adjusted by R140 Range: 12 nm
IR: OFF
STC/FTC: fully ccw
TP13 STC CURVE
4 us: 0.8 to 1.1 V, 10 us: 1.3 to 1.6 V
20 us: 1.9 to 2.3 V, 40 us: 2.7 to 3.0 V
60 us: 3.3 to 3.7 V, 90 us: 4.1 to 4.5 V
120 us: 4.3 to 4.7 V Ant. Height: 10 m
Range: 12 nm
Gain: fully cw
STC: fully cw
TP1 CR8 CR7 CR6 CR5 CR4 CR3 CR2 CR1
TP11
TP13
TP12
TP5
TP6
TP9
TP8 TP7 R140 TP4 TP3 TP2