Zack’s 2270

Power cord and switch was OK.  Main fuse was correct but filament was very distorted so replaced it.

Visual inspection issues noted

Upper right front cabinet corner area creased and seems to have been repaired (see last photo)

1 cabinet mounting screw did not have washer and was digging into the wood when tightened.  Added washer when re-assembling.

Lower right faceplate mounting stud was loose and the chassis corner was bent a bit.  I straightened it out and remounted the mounting stud.

Multiple push button switches did not spring back out fully when in “off” position.  Applying light oil remedied this.

Initial power up testing issues noted

All dial and meter lamps were dead and the dial vellum had yellowed.  Power was present at the bulbs so installed white LEDs and vellum.  The “stereo” lamp was also dead and replaced.

FM tuner meters way out of calibration.  Rather weak sensitivity.  After recap, I went through the Marantz alignment procedure and the tuner works correctly.

Recap went smoothly and decided to use very nice Nichicon GoldTune 10,000uF 63V caps for the main amp supplies.  The service manual schematic specifies 6,800uF, but Marantz installed 9,000uF caps (I have seen this more than once).  The old ones measured 8,500uF and 9,800uF while the new ones are matched at 9,500uF.  

Tested out phono and aux paths and all function correctly.

Cleaned the faceplate and knobs before reassembling.