Operation Manual

5-6 Maintenance
5.4 Troubleshooting Guide
The following table provides a general troubleshooting chart for the a
technician to isolate circuit failures within specific functional areas of the
VHF radio.
Note:
Microcomponents within the radio are generally not field-replaceable.
Therefore repairs to the radio typically go down to the PC board level
only. A replacement parts list for the RAY230/E can be found in Section 6.
Item No.Item No.
Item No.Item No.
Item No.
SymptomSymptom
SymptomSymptom
Symptom
Possible CausePossible Cause
Possible CausePossible Cause
Possible Cause
1 a. 10 amp fuse in power line open
b. Check Power SW and Relay (RL1)
c. Check SW circuit as follows
1) Q26 input voltage: 0.7V -ON
2) +5v line: IC306 out at CPU PCB
3) R166: open
4) D18: shorted. Defective/device: Power
Switch, D17-18, Q26-27 Relay (RL1), R166,
IC305-7
2 a. Defective handset cable and connector.
b. Check handset as follows.
1) +B line: +13V Q708 Keyscan output
2) +5v line: IC701 output
c. Defective/device: CPU (IC708), Reset IC
(IC707), Q701, Q704-6, Q708 Photo Coupler
(PC701)
d. Check CPU PCB as follows:
1) RXD data input at Q319-321
e. Defective/device: CPU (IC305), Q319-321
Photo Coupler (PC305, 307, 309)
3 a. Check RF PCB as follows:
1) RF on/off: +5V at pin 12 of J1
2) Q29 input
Unit does not turn on
and Main Switch LED
off during Standby
mode
Unit does not turn on
and LCD off during
Working mode
No sound with AF
signal applied to AF1
output (pin 10 of J2)
RAY230_sect5.p65 7/13/2001, 1:43 PM6