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IC-761 Distorted RX / TX PLL Modification | Radioaficion Ham Radio

IC-761 Distorted RX / TX PLL Modification

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Technical Bulletin

IC-761A HF ALL BAND TRANSCEIVER GENERAL COVERAGE RECEIVER

GJ36788

IC-761 Distorted RX / TX PLL Modification Technical Bulletin

SYMPTOM

Distorted receive and/or transmit audio on one or more bands. Audio may cut out completely. Distortion may be temperature related. Single sideband audio sounds "raspy" or "rough". Selected frequency may show instability.

CAUSE

The trimmer caps in the PL unit may have aged and changed values. REPAIR

Replace the following trimmer caps:

C78 10pf with an Icom # 4610000110 12pf unit VCO cap (white)

C88 10pf with an Icom # 4610000110 12pf unit VCO cap (white)

C97 6Pf with an Icom # 4610000100 6pf unit VCO cap (red)

C10 6Pf with an Icom # 4610000100 6pf unit VCO cap (red)

The replacement trimmer caps are long-life ceramics. A partial realignment will be required after these trimmers are replaced. See Service Manual for procedure.

Click the attached PDF.

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