Raymarine RAY230E Owner's Handbook Manual page 121

Maintenance
10
No transmit (TX)
11
Low power output
(TX)
d. Check VCO control voltage at TP3:
1.5V - 5.5V
e.Check PLL fin level at pin 8 of IC4,
245mV min
f. Defective/device: IC3-IC5, CPU
(IC305), IC13-14, Q8-13, VCO
a.Defective PTT switch on Handset
(S727)
b. Check PTT control circuit:
1) TXD data at Q705, pin 27 of IC 706
2) PTT signal at PC304, PC306,
PC308
3) RXD data at Q319-320
c. Check T8v line: Q31 output
d. Check PLL signal:5V at Q32 input,
IC305 pin79
e.Check PLL unlock: IC5 pin3,
unlock=51
f. Check PLL circuit: See Item 9
g.Defective/device
1) Handset: IC708, Q701, Q705-707
PC701, PTT Sw
2) CPU PCB: IC305, PC304-309
Q316-321, D307-312
3) RF PCB: Q31-32, PLL circuit
a.Check ANT cable and connector
b. Check DC line current: 25W 6.5A
c. Check LPF and Antenna switch
d. Check PA input power: 250mW typ.
e.Check power control circuit:
1) VR1-Low and VR2-High
2) APC output voltage at pin 2 of PA
3) H/L select: Q7 input (H-0V)
f. Defective/device: VR1-2, Q1-2, Q5-
7, D1-6, IC1-2 Antenna cable with c n
5-9