Fluke 6080A - A1 Display PCA 6-3.; A2 Coarse Loop PCA 6-4.; A3 Sub-Synthesizer VCO PCA 6-5.; A4 Sub-Synthesizer PCA 6-6.

TROUBLESHOOTING AND REPAIR
A1 Display PCA 6-3.
Adjustments: None.
A2 Coarse Loop PCA 6-4.
Adjustments: None.
Perform Reference Oscillator Calibration. See paragraph 3-14.
A3 Sub-Synthesizer VCO PCA 6-5.
Adjustments: R106 on Sub-Synthesizer PCA. See paragraph 6C-9.
A compensation data EPROM containing VCO tuning data is included. See
paragraph 6C-21 for data transfer instructions.
A4 Sub-Synthesizer PCA 6-6.
Adjustments: R106. See paragraph 6C-9.
Perform Reference Oscillator Calibration. See paragraph 3-14.
A5 Coarse Loop VCO PCA 6-7.
Adjustments: None.
Perform Coarse Loop compensation. See Appendix H.
A6 Mod Oscillator PCA 6-8.
Adjustments: None.
A7 Relay Driver PCA 6-9.
Adjustments: None.
A8 Output PCA 6-10.
Adjustments:
• R28, detector offset/linearity. See paragraph 6D-13 (Mod Control PCA).
• R20, RF Level adjustment. See paragraph 6D-15 (Mod Control PCA).
• RIO, AM Depth adjustment. See paragraph 6D-14 (Mod Control PCA).
• R96, Q16 Bias adjustment. See paragraph 6D-21 (Output PCA).
A compensation data EPROM containing Output PCA level correction data is
included. See paragraph 6-21 for data transfer instructions.
A9 Sum Loop VCO PCA 6-11.
Adjustments: R51 and C7, AM Bandwidth adjust. See paragraph 6D-20 (Premodulator
PCA).
Perform Sum Loop compensation. See Appendix H.
6-5