You might need the rectifier ground to get the 5V section up and running, depends on how the board is wired.

1. Measure the voltage on pins 10 and 11 on 3J1, the 12 pin plug (meter set to ac). You should get 18V ac between these.  Do you?

2. If this is so now measure voltage on fuse F5, (meter set to dc, red lead on fuse, black lead on negative lead of the large 12,000uF cap) should be 11V dc. Doyou?

3. If you get these, measure between 3J5-6 and neg lead on capacitor in step 2. Should get 5V dc. Do you?

Let us know the answers.

Out of interest can you use the meter to measure a battery, say car or mobile phone, voltage? This will test the meter and your use of it.