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Each exciting phase signal outputted from the CPU is amplified
by IC6 and used to determine the CR motor exciting position. By
making CR motor drive signal (CDRV) from the gate array high,
Q23 and Q22 are turned on and +15V is applied to the common
terminal
of CR motor, increasing the motor current. While by
making CDRV low, Q23 and Q22 are turned off to apply the
standby current to the CR motor through R58.
The control is performed by two-phase excitement shown in the
timing below. The current applied to the motor common terminal is
controlled by the CDRV.
1/10" Spacing timings
'CORV
1
P23 (CM1)
—
P22 (CM2)
——
P21 (CM3)
'P20 (CM4)
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(2) Hammer control section
This circuit makes the hammer ON signal from the gate array high
to turn on Q20 and Q19, conducting the hammer solenoid.
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(3) CARRIER origin detecting section
When the CARRIER comes to the origin, the CPU 60 pin be-
comes low (max. 0.8V) and is detected by this circuit.
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ZERO SENSE
3. Key control block
This circuit uses the CPU port as scan line (output) and sense line
(input), and recognizes the pressed key with the combination of them.
The scan line output timing is as shown below:
This machine recognizes 78 keys with combination of 10 scan lines
and 8 sense lines. (The right and left shift keys are common.) The
key matrix is as shown below:
(Key scan timing and cycles)
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SCAN 3
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SCAN 4
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SCAN 6
SCAN 7
SCAN 8
SCAN 9
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(Keyboard matrix)
SCANS
SCANS
SCANO
SCAN
Z scanz
Z scana
Z scans
9
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Pit
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SCANG
SCANT
DSS133 x 10
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SENSEO
SENSES
SENSES
26)
A senses
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