2-3
WARNING: DISCONNECT POWER PRIOR TO SERVICING
2-18.
TROUBLESHOOTING PROCEDURES.
The output network assembly troubleshooting
procedures are presented in Tables 2-1 through 2-3. Table 2-1 presents the directional
coupler circuit board troubleshooting. Table 2-2 presents the lightning detection circuit
board and spark gap troubleshooting. Table 2-3 presents the lightning protection circuit
board troubleshooting. Refer to Tables 2-1 through 2-3 to isolate the problem to a specific
circuit. Once the trouble is isolated, refer to the circuit board theory of operation
presented in PART I SECTION IV and the schematic diagrams presented in this section to
assist in problem resolution.
TABLE 2-1. DIRECTIONAL COUPLER CIRCUIT BOARD TROUBLESHOOTING
SYMPTOM
CIRCUITRY TO CHECK
HIGH REFLECTED POWER
1. Check diode D201 through D210.
METER INDICATION WHEN
ACTUAL REFLECTED POWER
IS LOW
TABLE 2-2. LIGHTNING DETECTION CIRCUIT BOARD/SPARK GAP TROUBLESHOOTĆ
ING
SYMPTOM
CIRCUITRY TO CHECK
HIGH REFLECTED POWER
1. Check the lightning detection circuit board for a
CONDITION
short circuit condition.
NO LIGHTNING DETECTION
1. Check the spark gap.
OPERATION
2. Check optically operated transistor Q401 on the
lightning detection circuit board.
TABLE 2-3. LIGHTNING PROTECTION CIRCUIT BOARD TROUBLESHOOTING
SYMPTOM
CIRCUITRY TO CHECK
HIGH REFLECTED POWER
1. Check the circuit board for a short circuit condition.
OR SHORTED OUTPUT
CONDITION
2-19.
COMPONENT REPLACEMENT PROCEDURE.
Component replacement procedures for
the output network assembly are presented in PART I SECTION V. Refer to
COMPONENT REPLACEMENT in SECTION V as required for the replacement
procedures.