Revox A77 Quick Reference Manual
By pvdm
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Also See for A77:
- Quick start manual ,
- Service manual (134 pages) ,
- Operating instructions manual (56 pages)
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Quick Reference Guide to Revox A77:
Page:
2
Necessary repairs
3
Layout of the boards / Power Supply PCB voltages
4
Power Supply Board layout
5
Tape Drive / Transport Control Board layout
6
Capstan Speed Control Board layout
7
Switch Board layout / VU Meter Board layout
8
Back side connections / Front panel knobs layout /
Calibration pots location
9
Calibration instruction – the short & quick version
10
Caps and component replace list [not done yet]
QRG Revox A77 |
www.reeltoreel.nl
| Philip van der Matten | ver 2.0 14 nov 2024 | page 1/10
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Summary of Contents for Revox A77
- Page 1 Quick Reference Guide to Revox A77: Page: Necessary repairs Layout of the boards / Power Supply PCB voltages Power Supply Board layout Tape Drive / Transport Control Board layout Capstan Speed Control Board layout Switch Board layout / VU Meter Board layout...
- Page 2 Revox A77 – Necessary repairs. - All Revox A77’s that have not been serviced will need service. These decks have been manufacured between 1967 and 1976, so by now they will probably be 50 years or older. - There is a lot of experience in the field about what components have often failed, and what components will likely fail in the future.
- Page 3 Revox A77 – Layout of the boards: Power Supply Board Capstan Speed Control Board Tape Drive/Transport Control Board Switch Board Power supply PCB voltages 27 V 27 V top: 27 V 27 V D102 – D101 21 V bottom 21 V...
- Page 4 Power Supply Board layout QRG Revox A77 | www.reeltoreel.nl | Philip van der Matten | ver 2.0 14 nov 2024 | page 4/10...
- Page 5 Tape Drive / Transport Control Board layout QRG Revox A77 | www.reeltoreel.nl | Philip van der Matten | ver 2.0 14 nov 2024 | page 5/10...
- Page 6 Capstan Speed Control Board layout QRG Revox A77 | www.reeltoreel.nl | Philip van der Matten | ver 2.0 14 nov 2024 | page 6/10...
- Page 7 Switch Board layout VU-Meter Board layout QRG Revox A77 | www.reeltoreel.nl | Philip van der Matten | ver 2.0 14 nov 2024 | page 7/10...
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Page 8: Backside Connections
3 ¾ O O 7 ½ MONO STEREO 2→1 HI MIC 1→2 HI MIC VOLUME BALANCE PHONES LEVEL LEVEL Calibration pots location QRG Revox A77 | www.reeltoreel.nl | Philip van der Matten | ver 2.0 14 nov 2024 | page 8/10... - Page 9 Revox A77 – Quick Overview Of Electrical Adjustments / Alignment Short Version IF you’re familiar with the procedure (if not I suggest you do it from SM 1 time). 1a - Capstan speed: check for 35..50 mV @ 9,5 cm/s at E1 (brown) and E2 (blue) of tacho head on capstan board.
- Page 10 Caps and component replace list To be completed QRG Revox A77 | www.reeltoreel.nl | Philip van der Matten | ver 2.0 14 nov 2024 | page 10/10...
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