SDR HEEA078711

Service difficulty report · Transceiver · Skrsky S76A

Difficulty date
May 20, 2002
Submitted
May 28, 2002
Operation
General aviation
Aircraft
N4253S
Make and model
Skrsky S76A
Aircraft serial
760035
Aircraft time
17,984 hours
Part
Transceiver
Part number
064100900
Part serial
7194
Condition
Malfunctioned
Location
Cockpit
Stage of operation
IN
How discovered
C
Nature of condition
L
Precautionary procedure
K

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

TRANSCEIVER RECEIVES GARBLED. PERFORMED PRELIMINARY INSPECTION. FOUND RECEIVER VERY WEAK. REALIGNED RECEIVER. NO HELP. FOUND SEVERAL INCORRECT VOLTAGES IN IF AND DETECTOR CIRCUITS. SWAPPED CR309 AND CR310 DIODES AND C323 AND C324 CAPACITORS. REALIGNED PRESELECTOR AND I F, NO HELP. SWAPPED C376 CAPACITOR. ALIGNED I F, NO HELP. REALIGNED PRESELECTOR AND I F AND ADJUSTED R333 IF AGC. RECEIVER SENSITIVITY GOOD, BUT COULD NOT ADJUST SQUELCH TO SPECS. REPLACED I303 IC AND RECEIVER NOW RECEIVING STRONG. REPLACED Q304 RESISTOR. REPLACED I304 IC CHIP AND REALIGNED RECEIVER. REPAIRED. BENCH CHECK GOOD.