Ricoh A151 Operating Instructions Manual page 106

TROUBLESHOOTING
...
The copier's microcomputer constantly monitors mechanical and electrical
functions. If a malfunction occurs, E and service code numbers will blink in
the copy counter. If that happens, turn the main switch off, wait a few
seconds, and then turn it on. If the service code appears again, call your
service representative.
When the used toner tank is full, E and 70 will start to blink in the copy
counter. Only 250 copies can be made after this. Call your service repre-
sentative.
"E" blinks.
If either the Auto Image Density indicator or the Manual Image Density
indicator starts to blink, turn the main switch off and on again. Call your
service representative and explain the problem if this condition re-occurs.
(However, you can still make copies.)
"$
Service code number blinks.
OR
*Illustrations show type 1.