Ricoh FT7770 Service Manual page 160

30
April, '89
Total Counter -
-
The CPU energizes the total counter by supplying +3 volts at CN201-A14.
The de drive board then drops CN301-B12 to O volts. This energizes the
counter and closes the internal contact. When the contact closes CN206-B1
goes HIGH and the CPU determines that the total counter has energized.
-Key Counter (option) -
If the key counter holder is installed, the copier will not operate unless the
key counter is installed.
The CPU energizes the key counter by supplying +3 volts at CN201-B16.
The dc drive board then drops CN301-A16 to O volts. This energizes the
counter and opens the internal contact. When the contact opens CN203-B13
goes LOW, informing the CPU that the key counter has energized.
The Call Service indicator does not light if the key counter does not ener-
gize.
-A3/LDGCounter (option)-
This counter keeps count of all A3/LDG copies
SP 4-4 is set.
The A3/LDG counter operates in the same way
Related Service Call Condition: See FIELD MANUAL
SC 13: Total counter or A3/LDG counter failure
made.
as the total counter.
2-104
It is effective when
for details.