IC-M600

Symptom:		Radio will not transmit or receive after warm-up.
Probable Cause:		PLL unlock.
Cure:		Replace unstable C228 with a ceramic equivalent and adjust the lock voltage for 2 volts instead of 2.5 volts as stated in the manual.

Symptom:		Carrier output when mic is keyed in SSB mode, distorted TX audio. RF feedback.
Probable Cause:		RF feedback.
Cure:		Add a ground jumper at J10, pin 4 on main unit.

Symptom:		Won't operate tuner.
Probable Cause:		S1 and/or S2 on the logic are not set in the proper position. Q52 may be bad.
Cure:		Set switches correctly. Check Q52 for failure.

Symptom:		No display.
Probable Cause:		IC5 and C12 blown on logic unit.
Cure:		Replace blown IC5 and C12.

Symptom:		Radio won't turn off.
Probable Cause:		Bad Q1 on relay unit.
Cure:		Replace Q1.

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