Technical
Unlike later Sanyo machine, this is a constant lace machine with the tape always in contact with the head drum. It uses several double-sided PCBs and is well laid out and relatively tidy under the covers.Heat issues appear to have been a thing with Sanyo fitting a small metal-bladed fan which runs during playback, record and still modes and can be quite noisy.
Videos
Some videos showing this model being worked on including some issues are here:https://youtu.be/Hxsv1HxPTgw
https://youtu.be/MkoJspZOFkM
https://youtu.be/E5RdHmZqShE
Quick fault guide
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| Fault | Solution |
|---|---|
| Loss of head drum speed lock, unstable picture | Adjust VR404 (drum free run speed) on the servo board until you get a perfect picture. Replacing the capacitors is recommended. |
| Garbled test signal pattern | Connect the unit to an analog TV via the RF output, set the test signal switch to ON and adjust VR124 (test signal oscillator frequency) on the W1 board until the pattern is stable. |
| Rewind function causes the tape to advance forward, REW LED indicator is lit up | The rewind solenoid failed to operate because fusible resistor R977 (2.7Ω) in system control board W4 was open-circuit. This can also cause intermittent lacing. |
| Keeps stopping in playback and aborts eject | If the deck keeps stopping after pressing play and when eject is pressed it laces back up half through unlacing (hold down eject to fully eject the cassette), check the opto-coupler under the take up reel. Even if you can see the red LED, the pickup may well have become ‘lazy’. Measuring the voltage change on the output of the pickup whilst breaking the light to it should see around 13v. If it’s only a volt or two then this is defective. |