Sharp DV-550U Service Manual page 36

DV-550U
12-5. IC702 BA6796FP
MOTOR DRIVER
Pin No. Terminal name
1 OPOUT
2 CH4-IN
3 CH4-IN'
4 CTL1
5 CTL2
6 FWD
7 REV
8 TRAY-IN
9 GND
10 CH5-OUT-
11 COM-OUT
12 CH4-OUT+
13 CH3-OUT+
14 CH3-OUT-
Note 1: Positive and negative output have polarity with respect to input. (An example: 19 pin input 'H': 18 pin output 'H')
Note 2: Tray positive output and tray negative output have polarity with respect to mode. (An example: 11 pin output
'H' in FORWARD mode)
12-5-1. Block Diagram
12-5-2. Mode change table
CTL1 and CTL2
CTL1 CTL2
L L
L H
H L
H H
Note: OFF state: Output has high impedance.
Operation function
Ope amp. output terminal
CH4 Input terminal
CH4 Gain adjustment input terminal
Contorol 1 input terminal
Contorol 2 input terminal
Tray forward input terminal
Tray reverse input terminal
Tray input terminal
Sub-straight GND
Tray negative output terminal
Tray positive output terminal/CH4
negative output terminal
CH4 Positive output terminal
CH3 Positive output terminal
CH3 Negative output terminal
CH3-IN
25 24 23
28 27 26
10K
13.3K
- +
-
+
Level shift
T.S.D
+
-
26.6K
LOGIC
10K
CTL1 CTL2 PWD
1 2 3 4 5
CH4-IN
CH1 CH2 CH3
OFF
ON
OFF ON
Pin No. Terminal name
15 CH2-OUT-
16 CH2-OUT+
17 CH1-OUT-
18 CH1-OUT+
19 CH1-IN
20 CH1-IN'
21 VCC
22 CH2-IN
23 CH2-IN'
24 CH3-IN
25 CH3-IN'
26 VREF-IN
27 OPIN+
28 OPIN-
CH2-IN CH1-IN
22 21 20
VCC
10K
10K
13.3K
13.3K
Level shift
-
-
+
+
Level shift
V/I
REV
6 7 8 9
CH5-IN
For F and R (CH5 control, valid only when CH5 is ON)
F
CH4 CH5
L
ON
L
H
OFF
H
OFF ON
12-9
Operation function
CH2 Negative output terminal
CH2 Positive output terminal
CH1 Negative output terminal
CH1 Positive output terminal
CH1 Input terminal
CH1 Input terminal for gain adjustment
VCC
CH2 Input terminal
CH2 Input terminal for gain adjustment
CH3 Input terminal
CH3 Input terminal for gain adjustment
Bias amp. input terminal
Operational amplifier nonreverse input terminal
Operational amplifier reverse input terminal
CH1-OUT CH2-OUT
19 18 17 16 15
D D D D
Level shift
D D D D D
10 11 12 13 14
CH5-OUTCH4-OUT CH3-OUT
T.S.D ; Thermal shutdown
D; Drive buffer
Unit of resistance is [Ω].
R Output mode
L High impedance
H Reversing (reverse)
L Forward rotation (forward)
H Brake