Pioneer KEX-900 Service Manual page 38

PA3019 (Driver Unit)
OUT MS MS
vec vs Te
CMG CMR CMH
GND M2 MC
Mt OUT NF
TO
STANOBY
CONTROL
Function and Operation
Power supply for internal logic (WL).
Input terminal for Relay Tabie Rotation Sensor (MR1) signal.
Input termina! for Relay Table Rotation Sensor (MR2) signal.
RIN 1
Input
Waveform output of Relay Sensor Input 1 (2 Pin) signal. Output
Output | Waveform output of Relay Sensor Input 2 (3 Pin) signal.
IN GND - GND terminal of small-signal series.
Logic input terminal for motor control
Standby control. At active "L" (0.7V or less), the IC current is switched OFF.
1m STBY 2 Input | Standby control. At active ''H" (3.5V or more), the IC current is switched OFF.
12 MS IN Input | Amplifier input (inverted input) terminal for Music Sensing (MS).
13 MS NF 1/O | Output of the MS amplifier and input of the MS Schmitt circuit.
Output of Schmitt circuit for MS. MS OUT outputs a pulse when the signal level of the MSNF
terminal exceeds OdBm or enters OPEN staturs when it is 0 dBm or less.
Output | + terminal drive output of motor M1 for the head table drive.
Drive output of the common terminal of motors M1 and M2.
+ terminal drice output of drive motor M2 of the FF/REW selecting gear.
Output
[ie fourens =
19 CMH
GND terminal of the motor drive circuit.
H (+) terminal drive output of capstan motor M3.
Output voltage: During speed controi = approx. Vcc-1.7V
During LOAD or EJECT =
6.9V
R terminal drive output of capstan motor M3.
(1) During speed control: OPEN
(2) During LOAD: approx. OV
(3) During EJECT: approx. 7V
GND ( — ) terminal drive output of capstan motor M3.
(1) During speed control: approx. OV
(2) During LOAD/EJECT: OPEN
Connecting terminal of capacitor for setting the timer that switches OFF the power
transistor for constant motor drive at a change in logic input 10, !1. {2.
23 vs Output} Power supply for relay table rotation sensor. Approx. 7V.
| 24 | Vec Input | Power supply terminal for IC.
Output
Output