Raymarine RAY230E - Page 119

5-7
Maintenance
Item No.Item No.
Item No.Item No.
Item No.
SymptomSymptom
SymptomSymptom
Symptom
Possible CausePossible Cause
Possible CausePossible Cause
Possible Cause
3) B+ line: +13V
4) R5v line: +5V at Q33 output
5) COM8v line: +8v at IC12 output
6 DISC out at pin 4 of J2
b. Defective/device:
2nd IF IC (IC7), Disc (Z1), De-emph IC
(IC8), IC12-13, Q30, Q33-34, D19
4 a.Check CPU PCB as follows :
1) +5vA line
2) AF level: pin 3 of IC310
3) AF level: Q302 and Q303 output
4) AF level: cross-point SW at pins 7,
8, 17 of IC315
5) AF level: Buff amp at pin 1 of
IC319-321
b. Defective/device:
CPU (IC305), IC310, IC315, IC319-
321, Q302-304, Flex cable and
connector
5 a.Check +5V regulator of IC804
b. Check AF level on PCB as follows:
1) VR801 out pin 2 of J802
2) Analog SW out at pins 2, 6 of IC801
3) PA out at pin 1 of IC802, C817
c.Defective/devices: IC801 - 804,
VR801, C817
6 a.Check handset PCB as follows:
1) +9V line: IC714 output
2) +5V line: IC702 output
3) +2.5V Vref: Q703 output, VTH
output
4) AF leveL: pin 7 of IC704
5) AF level: pin 2 of IC711
6) AF level: pin 2 of IC706
No sound with AF
signal applied to
Main unit out
No sound with AF
signal applied to SP
box
No sound with AF
signal applied to
Handset