Roland spd 20 model rythem pad sound is not coming but display shows error

Usually the bulb is burned out.
www.rolanddga.com/.../support/video/?.

this could be fixed at a cost of nearly 100$

The adaptor for the SPD-20 is not 12 V ac (Altern Current) the SPD-20 need only Altern current (12V AC)
if the adaptor is 12 v cc, the internal circuits can not made +5v , 0, -5v
for simetrical operactional supply.
And Spd 20 show "Analog test err" and "batery low"

did you fix it?

Permanently erasing the currently selected wave.
1. "[>] to delete." is indicated. Press [>].
If you hold down [SHIFT] and press [ALL SOUND OFF] in wave mode, you can jump to this screen.
2. A "delete, sure?" indication appears. Press [ENTER] to execute the deletion, or press [ "now processing.." is displayed. After execution, a "complete!" indication appears and the SPD-
S returns to the wave mode.

Source: page 51 of the user manual
pdf download: http://www.roland.com/products/en/_support/om.cfm?PRODUCT=SPD-S

I am not understanding the problem. Does it make any sound at all? If so Does the unit make all the sounds it was programed to do?

I am having the same issue with a SPD-11 that ahd brought from Japan. Please let me know if you get a resolution for your issue.

You must get a Roland or Boss B.R.A. adapter, I just got mine from Sweetwater for 27.00 or something like that, fixed the problem completely, no 3rd party adapters, it's rigged so you must buy theirs, If you use a 3rd party adapter, it will fire up, and run "analog" test error there after. I hope this helps somebody. Peace Out!!

Manuals are here in PDF:
ftp://ftp.roland.co.uk/productsupport/Manuals/

The card I have always been using is now also suddenly giving this message. I found an old SanDisk 16MB and a 1GB SanDisk that works perfectly in my Boss 864 and they also give the same message. Trying to go into formatting brings the message "no card!"