Panasonic KX-T2388 Service Manual And Technical Manual page 22

KX-T2388
Hi MOTOR DRIVE CIRCUIT
Playback (or Recording)
When IC1 pin 44 becomes "H" and Q17 ON. And then the motor voltage supplied from Q6 changes to the voltage on
playing. When IC1 pin 44 becomes "H" Q17 ON > Q14 — Q12 ON thus the governor (IC7) is activated and the motor
voltage is regulated, hence the motors run at a constant speed.
Fast Forward
IC1 pin 44 and 41 become "H" > Q16 - Q17 ON — Q12 ON, and the motor current flows through Q12 — Motor > Q16
and the motor is rotated at high speed.
Rewind
When IC1 pin 42 becomes "H" Q15 goes ON. Q13 also goes on, and the motor current flows through Q13 — Motor >
Q15. Because this is the reverse direction to the current which flows in the above Fast Forward mode, the motor rotates
at high speed in the reverse direction.
Circuit Diagram
:
JACK
(a
D25 ;
D20
Ici @
R Motor
R61
(S) R63 IC1
Qe FF/ PLY
"y)
ai7(
oS R64
ICi
F Motor