Table of Contents
Advertisement
Model 562A
SECTION IV
THEOR Y OF OPERATION
4-1. INTRODUCTION.
Section IV
Operation of the 562A is dependent upon a series of timing and reference volt-
ages.
The timing voltages are supplied by the control board (Al3).
Reference
voltages can be supplied by the power supply (A14) or by an external source.
The following paragraphs will describe the functions of various circuits in the
recorder.
4-2. CONTROL BOARD OPERATION.
Operation of the recorder is dependent upon a series of timing voltages
developed by the control board.
Refer to the functional diagram, figure 5-2.
Assume the data source initiates a print command.
Print Command Binary
Number 1 changes state and immediately supplies the data source with a disable
voltage.
Assume Print Command Binary Number 2 has its input connector
arranged so only one print is required.
The Print Scan Schmitt is in the
proper state because the shutter is open.
The Print Scan Schmitt applies the
proper signal to the "And" Gate.
The "And" Gate conducts and causes the
Clutch Binary to change state.
The clutch solenoid starts to energize.
When
the Clutch Binary changes state, a signal is applied to the Delay Multivi-
brator (2MS).
The output of the 2 ms delay multivibrator produces a reset pulse
which is applied to the storage binaries.
This removes stored information and
sets the storage binaries in the proper state to receive new information.
The
output of the 2 ms delay multivibrator is also applied to a 60 J-Ls delay multi-
vibrator.
The output of the 60 J-LS multivibrator is applied to the storage binary
gate diodes by way of the
+
and - Transfer Amplifiers, then data transfer takes
place.
The output of the 60 f.LS multivibrator is also applied to the
Print Command Binaries and resets them.
While this action is occurring, the
clutch solenoid is completing its pull-in cycle.
When the clutch solenoid has
engaged the clutch, the clutch will remain engaged for one complete revolution
of the clutch assembly because of mechanical action.
As the clutch assembly
rotates, the shutter closes, de-energizing the photo conductor.
This causes
the schmitt to change state, initiating the scan signal.
The scan signal then
resets the clutch binary and opens the Inhibit Gate circuits which can allow the
pawl magnets to energize.
When the brush senses the correct voltage, the pawl
magnets de -energize and lock the print wheels at the proper position.
Then the
character is printed as the clutch assembly finishes its one revolution, disengages,
and opens the shutter.
The photo conductor is energized and the system is ready
for the next print command.
01081-1
4-1
Advertisement
Table of Contents
