Sharp DV-550U, Service Manual

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