Furuno CH-270, Руководство по обслуживанию

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3. CHECK AND ADJUSTMENT
3.1 Test Points
DISP Board (06P0238)
Test Points Name Rating Remarks
TP1 +5V 4.75 to 5.25 V Source voltage of LCD control circuit in LCD 1.unit
TP3 PGND
TP4 No name 2.40 V + 0.05 V
TP7 +12V 11.8 V to 12.2 V Source voltage of LVD inverter board
TP8 +5V 4.75 V to 5.25 V +5 V for DISP board
TP10 GND
TP11 GND
TP12 Switching
Frequency
70 kHz + 1 kHz Adjusted by R65
CPU Board (06P0258)
Test Points Name Rating Remarks
TP1 TXV 3.0 V
TP2 SIG 0 to 5 V Echo signal(DC level) from the TRX board
TP3 TVG 5 to 0 V TVG curve
TP4 KP Trigger pulse
TP5 TX0 Pulsed transmission carrier signal
TP6 TX1 Pulsed transmission carrier signal
TP7 GND
TP8 LCL Local signal
TP9 VOL 0 to 5 V Audio volume control voltage
TP10 Not used
TP11 DISP CLK 25.175 MHz
TP12 GND
TP13 PITCH 3.5 V With no pitch signal
TP14 ROLL 3.5 V With no roll signal
TP15 R 0 to 1.0 Vpp Red
TP16 G 0 to 1.0 Vpp Green
TP17 B 0 to 1.0 Vpp Blue
TP18 GND
TRX board (06P0241)
Test Points Name Rating Remarks
TP1 GND
TP2 IF 0 to10 Vpp 455 kHz IF signal
TP3 SIG OUT 0 to 10 VDC Rectified receiving signal
TP4 GND
TP5 AUD OUT 0 to 10 Vpp 1 kHz Audio Signal
TP6 TR2 See Figs. 3.1 and 3.2
TP7 GND 0 V
TP8 TR1 See Figs. 3.1 and 3.2
TP9 AGC 0 to 3VDC
TP10 VG 0.5 to 1.5 VDC Gain control voltage; min: 0.5 V, Max: 1.5V.