JVC KD-S845 User manual

SERVICE MANUAL
COPYRIGHT © 2003 VICTOR COMPANY OF JAPAN, LTD. No.49858
2003/5
CD RECEIVER
4985820035KD-S845
TABLE OF CONTENTS
1 Important Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
2 Disassembly method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3 Adjustment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4 Description of major ICs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
45Wx4
TU N
E
R
SCM
RND
RPT
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11
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KD-S845
BA
ND
U ------- Other Areas
Area Suffix
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1-2 (No.49858)
SECTION 1
Important Safety Precautions
1.1 Safety Precautions
!Burrs formed during molding may be left over on some parts of the chassis. Therefore,
pay attention to such burrs in the case of preforming repair of this system.
!Please use enough caution not to see the beam directly or touch it in case of an
adjustment or operation check.
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(No.49858)1-3
1.2 Preventing static electricity
Electrostatic discharge (ESD), which occurs when static electricity stored in the body, fabric, etc. is discharged, can destroy the laser
diode in the traverse unit (optical pickup). Take care to prevent this when performing repairs.
1.2.1 Grounding to prevent damage by static electricity
Static electricity in the work area can destroy the optical pickup (laser diode) in devices such as DVD players.
Be careful to use proper grounding in the area where repairs are being performed.
(1) Ground the workbench
Ground the workbench by laying conductive material (such as a conductive sheet) or an iron plate over it before placing the
traverse unit (optical pickup) on it.
(2) Ground yourself
Use an anti-static wrist strap to release any static electricity built up in your body.
(3) Handling the optical pickup
• In order to maintain quality during transport and before installation, both sides of the laser diode on the replacement optical
pickup are shorted. After replacement, return the shorted parts to their original condition.
(Refer to the text.)
• Do not use a tester to check the condition of the laser diode in the optical pickup. The tester's internal power source can easily
destroy the laser diode.
1.3 Attention when traverse unit is decomposed
*Please refer to "Disassembly method" in the text for the CD pickup unit.
• Apply solder to the short land before the flexible wire is disconnected from the connector on the CD pickup unit.
(If the flexible wire is disconnected without applying solder, the CDpickup may be destroyed by static electricity.)
• In the assembly, be sure to remove solder from the short land after connecting the flexible wire.
1M
(caption)
Anti-static wrist strap
Conductive material
(conductive sheet) or iron plate
Pickup
Short-circuit point
(Soldering)
Flexible wire
Pickup
Short-circuit point
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1-4 (No.49858)
SECTION 2
Disassembly method
2.1 Main body
2.1.1 Removing the front panel assembly
(See Fig.1)
(1) Push the detach button in the lower left part of the front
panel and remove the front panel assembly in the direction
of the arrow.
Fig.1
2.1.2 Removing the front chassis assembly
(See Figs.2 to 3)
• Prior to performing the following procedure, remove the front
panel assembly.
(1) Release the two joints aand two joints bon both sides of
the main body.
(2) Release the two joints con the bottom side of the main
body and remove the front chassis assembly in the direc-
tion of the arrow.
Fig.2
Fig.3
Front panel assembly
Eject button
Joint
a
Joint
a
Front chassis assembly
Joint
b
Joint
b
Front chassis assembly
Joint cJoint c
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(No.49858)1-5
2.1.3 Removing the heat sink
(See Fig.4)
(1) Remove the three screws Aon the left side of the main
body.
Fig.4
2.1.4 Removing the bottom cover
(See Figs.5 and 6)
• Prior to performing the following procedure, remove the front
panel assembly, front chassis assembly and heat sink.
(1) Turn over the main body and release the two joints d, two
joints eand joint f.
CAUTION:
Do not damage the main board when releasing the joint fusing
a screwdriver. (See Figs.5 and 6)
Fig.5
Fig.6
Heat sink
AA
Joint d
Joint e
Joint f
Bottom cover
Rear panel
Joint e
Joint d
Joint f
Rear panel
Bottom cover
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1-6 (No.49858)
2.1.5 Removing the rear bracket
(See Fig.7)
• Prior to performing the following procedure, remove the front
panel assembly, front chassis assembly, heat sink and bottom
cover.
(1) Remove the one screws B, for screws Cand three screws
Don the back side of the main body.
(2) Remove the rear bracket.
Fig.7
2.1.6 Removing the main board
(See Fig.8)
• Prior to performing the following procedure, remove the front
panel assembly, front chassis assembly, heat sink, bottom
cover and rear bracket
(1) Remove the two screws Eattaching the main board.
(2) Disconnect the connector CN501 and remove the main
board.
Fig.8
2.1.7 Removing the CD mechanism assembly
(See Fig. 9)
• Prior to performing the following procedure, remove the front
panel assembly, front chassis assembly, heat sink, bottom
cover, rear bracket, main board and CD mecha board.
(1) Remove the three screws F.
Fig.9
CC
DD
B
Rear bracket
Main board assembly
E
E
CN501
CD mechanism section
F
F
Top chassis
F
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(No.49858)1-7
2.1.8 Removing the front board
(See Figs. 10 to 12)
• Prior to performing the following procedure, remove the front
panel assembly.
(1) Remove the four screws Gon the back side of the front
panel assembly.
(2) Release the ten joints g.
(3) Take out the front board.
Fig.10
Fig.11
Fig.12
G
G
G
Joint g
Joint g
Rear cover
Front panel
Joint g
Joint g
Joint g
Front board
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1-8 (No.49858)
2.2 CD mechanism section
2.2.1 Removing the CD mechanism control board
(See Fig.1 and 2)
(1) Unsolder the part a and bon the CD mechanism control
board.
(2) Remove the stator fixing the CD mechanism control board
and the damper bracket (To remove the stator smoothly,
pick up the center part).
(3) Remove the screw Aattaching the CD mechanism control
board.
(4) Remove the CD mechanism control board in the direction
of the arrow while releasing it from the two damper bracket
slots dand the front bracket slot e.
(5) Disconnect the flexible wire from connector on the pickup
unit.
ATTENTION:
Turn the FD gear in the direction of the arrow to move the en-
tire pickup unit to the appropriate position where the flexible
wire of the CD mechanism unit can be disconnected easi-
ly.(Refer to Fig.2)
Fig.1
Fig.2
Front bracket
CD mechanism
control board
Damper bracket
h
c
d
b
a
DD
D
CD mechanism assembly
Ae
h
Shift the lock
Flexible wire
Pickup unit
FD gear
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(No.49858)1-9
2.2.2 Removing the loading motor
(See Fig.3 to 5)
• Rrior to performing the following procedure, remove the CD
mechanism control board.
(1) Remove the two springs fattaching the CD mechanism as-
sembly and the front bracket.
(2) Remove the two screws Band the front bracket while pull-
ing the flame outward.
(3) Remove the belt and the screw Cfrom the loading motor.
Fig.3
Fig.4
Fig.5
CD mechanism control board
Loading motor Front bracket
f
B
f
Front bracket
Pull outward Pull outward
Flame
C
Loading motor
Belt
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1-10 (No.49858)
2.2.3 Removing the CD mechanism assembly
(See Fig.1, 6 to 9)
• Prior to performing the following procedure, remove the CD
mechanism control board and the front bracket (loading mo-
tor).
(1) Remove the three screws Dand the damper bracket.
(2) Raise the both sides fix arms and move the fix plates in the
direction of the arrow to place the four shafts gas shown in
Fig.8 and 9.
(3) Remove the CD mechanism assembly and the two springs
hattaching the flame.
(4) Remove the two screws Eand both sides rear damper
brackets from the dampers. Detach the CD mechanism as-
sembly from the left side to the right side.
ATTENTION:
The CD mechanism assembly can be removed if only the rear
damper bracket on the left side is removed.
Fig.6
Fig.7
Fig.8
Fig.9
DD
Damper bracket
CD mechanism assembly
Flame h
h
D
D
Fix plate (L)
g
g
Rear damper bracket
Fix arm (L)
Damper
E
Fig.9
Rear damper bracket
Fix arm (R)
Damper
Fix plate(R)
E
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(No.49858)1-11
2.2.4 Removing the feed motor assembly
(See Fig.10)
• Prior to performing the following procedure, remove the CD
mechanism control board, the front bracket (loading motor)
and the CD mechanism assembly.
(1) Remove the two screws Fand the feed motor assembly.
Fig.10
2.2.5 Removing the pickup unit
(See Fig.10 and 11)
• Prior to performing the following procedure, remove the CD
mechanism control board, the front bracket (loading motor),
the CD mechanism assembly and the feed motor assembly.
(1) Detach the FD gear part of the pickup unit upward. Then re-
move the pickup unit while pulling out the part iof the FD
screw.
ATTENTION:
When reattaching the pickup unit, reattach the part jof
the pickup unit, then the part iof the FD screw.
(2) Remove the screw Gattaching the nut push spring plate
and the pickup mount nut from the pickup unit. Pull out the
FD screw.
Fig.11
2.2.6 Removing the spindle motor
(See Fig.12 and 13)
• Prior to performing the following procedure, remove the CD
mechanism control board, the front bracket (loading motor),
the CD mechanism assembly and the feed motor assembly.
(1) Turn up the CD mechanism assembly and remove the two
springs kon both sides of the clamper arms. Open the
clamper arm upward.
(2) Turn the turn table, and remove the two screws Hand the
spindle motor.
Fig.12
Fig.13
Pickup unit
Part i
FD screw
Feed motor assembly
FD gear Pickup unit
Part j
F
Nut push spring plate
Pickup mount nut
Pickup unit
FD screw
G
kk
Spindle motor
H
H
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1-12 (No.49858)
SECTION 3
Adjustment
3.1 Adjustment method
Standard volume position
Balance and Bass &Treble volume : lndication"0"
Loudness : OFF
BBE : OFF
Frequency Band
FM 87.5MHz to 108.0MHz
AM 531 kHz to 1602 kHz
Dummy load
Exclusive dummy load should be used for AM, and FM. For
FM dummy load, there is a loss of 6dB between SSG output
and antenna input. The loss of 6dB need not be considered
since direct reading of figures are applied in this working
standard.
EXTGS004-26P
Test instruments required for adjustment
1. Digital oscilloscope (100MHz)
2. AM Standard signal generator
3. FM Standard signal generator
4. Stereo modulator
5. Electric voltmeter
6. Digital tester
7. Tracking offset meter
8. Test Disc JVC :CTS-1000
9. Extension cable for check
EXTGS004-26P 1
Standard measuring conditions
Power supply voltage DC14.4V(10.5~16V)
Load impedance 4 (2 Speakers connection)
Line oout impeadance 20k
Output Level Line out 2.0V (Vol. MAX)
How to connect the extension cable for adjusting
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(No.49858)1-13
3.2 Flow of functional operation unit TOC read
When the pickup correctly moves
to the inner area of the disc
v
Microprocessor
commands
FMO
TC9490FA "40"
FEED MOTOR
+TERMINAL
IC501 "7"
REST SW
When correctly focused
Focus Servo Loop ON
Power ON
Set Function CD
Disc inserted
Pickup feed to the inner area
YES
Laser emitted
Focus search
YES
Disc rotates
RF signal eye-pattern
remains closed
Tracking loop closed
RF signal eye-pattern
opens
TOC read out
Jump to the first track
Play
When the laser diode correctly
emits
Microprocessor
commands
SEL
TC9490FA"38"
LD
CN601"1"
"No disc"
display
When the disc correctly rotates
Microprocessor
commands
DMO
TC9490FA "41"
Spindle
motor(-)
IC501 "4"
Tracking Servo Loop ON
RF signal
Rough Servo Mode
CLV Servo Mode
(Program Area)
CLV Servo Mode
(Lead-In Area;
Digital :0)
$83 $82 $81
0V
6V
4V
2V
OFF
ON
3.3V
Hi-Z
FOO
TA2157 "15"
2.2V
$84
3.3V
0V
4V
0V
$84 $86 $ A200
3.3V
2.2V
0V
6V
3.2
2V
Rough
Servo
Acceleration Servo CLV
0.5 Sec0.5 Sec
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1-14 (No.49858)
3.2.1 Feed section
3.2.2 Focus section
3.2.3 Spindle section
3.2.4 Tracking section
Is the voltage output at
IC541 pin "40" 5V or 0V?
Is the wiring for IC541
pin 27?
Is 3.3V present at IC501
pin "20"?
Check CD 8V
and 5V.
Check the vicinity of
IC541.
Check the feed motor
connection wiring.
Is 6V or 2V present at
IC501 "6" and "7"?
Check IC501.
Is 4V present at both
sides of the feed motor?
Check the feed motor.
YES
YES
NO YES NO
YES
NO
NO
NO
YES
NO
YES
YES
When the lens is
moving:
4V
Does the S-search
waveform appear at
IC501 pins "8" and "9"?
Check the circuits in
the vicinity of IC501
pins"15"and"16".
Check the pickup and
its connections
NO
NO
NO
NO
YES YES
YES
YES
YES
Is the disk rotated?
Does the RF signal
appear at RF test point?
Is the RF waveform at RF
test point distorted?
Proceed to the Tracking
section
Is 4V present at IC501
pins "3" and "4"?
Check the spindle motor
and its wiring
Check the circuits in the
vicinity of IC521 "6"to
"7" or the pickup
Is 4V present at IC541
pins "41" ?
Check IC541
Check the vicinity of
IC501.
NO
YES
YES YES
When the disc is rotated
at first:
Approx. 1.2V
Is the tracking error signal
output at IC521 "11"?
Check IC541.
Check the circuit in the
vicinity of IC521 pins
"2"~"7".
Check the pickup and
its connections
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TEL 13942296513 QQ 376315150 892498299
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(No.49858)1-15
3.3 Maintenance of laser pickup
(1) Cleaning the pick up lens
Before you replace the pick up, please try to clean the lens
with a alcohol soaked cotton swab.
(2) Life of the laser diode
When the life of the laser diode has expired, the following
symptoms will appear.
• The level of RF output (EFM output:ampli tude of eye
pattern) will be low.
(3) Semi-fixed resistor on the APC PC board
The semi-fixed resistor on the APC printed circuit board
which is attached to the pickup is used to adjust the laser
power.Since this adjustment should be performed to match
the characteristics of the whole optical block, do not touch
the semi-fixed resistor. If the laser power is lower than the
specified value,the laser diode is almost worn out, and the
laser pickup should be replaced. If the semi-fixed resistor
is adjusted while the pickup is functioning normally,the la-
ser pickup may be damaged due to excessive current.
3.4 Replacement of laser pickup
Is RF output
1.0 ± 0.35Vp-p? Replace it.
NO
YES
O.K
Turn off the power switch and,disconnect the
power cord from the ac outlet.
Replace the pickup with a normal one.(Refer
to "Pickup Removal" on the previous page)
Plug the power cord in,and turn the power on.
At this time,check that the laser emits for
about 3seconds and the objective lens moves
up and down.
Note: Do not observe the laser beam directly.
Play a disc.
Check the eye-pattern at RF test point.
Finish.
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TEL 13942296513 QQ 376315150 892498299
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1-16 (No.49858)
SECTION 4
Description of major ICs
4.1 AN80T07 (IC901) : Regulator
• Block diagram
• Pin function
Pin No. Symbol Function
1 SW5V Output When Mode 1 pin is "M", "H" SW output is VDD -0.7V (Io=100mA min).
2 COMP Output When ACC input pin is "H" COMP Output is VDD -0.7V (Io=100mA min).
3 ACC Input L: COMP Output OFF and H: COMP Output ON
4 VDD Output 5.7V Output voltage for a microcontroller (Io=100mA min).
5 NC NC pin
6 MODE1 3 Input "L", "M", "H" control pin
7 CD Output When Mode 1 pin is "H" CD output is 8V (Io=1200mA min).
8 EXT Output When Mode 1 pin is "M", "H" EXT output is Vcc-1.0V (Io=300mA min).
9 VCC Connected to car BACKUP Power supply.
10 ANT Output When Mode 2 pin is "H" ANT output is Vcc-1.0V (Io=300mA).
11 MODE2 L: ANT Output OFF and H: ANT Output ON
12 BATT.DET NPN Transistor open collector Output (When battery is lower then 9V "L")
13 Audio Output When Mode 1 pin is "M", "H" Audio output is 9V (Io=500mA min).
14 ILM AJ ILM (Illumination) Output adjustable pin.
15 ILM(Illumination) Output When Mode 1 pin is "M", "H" ILM output is 10V (Io=300mA min).
16 GND Connected to the IC substrate.
Pre
Drive
Reference Voltage
Pre
Drive EXT
Out
*ASO, Peak Current Protection.
*Thermal Protection (Except
VDD, Comp output).
ANT
Out
Pre
Drive Pre
Drive
15 11 1 4 8 9 10 7 12 2 16
ILM
10V MODE2 SW5V
Out VDD
5.7V EXT Vcc ANT CD
8.0V BATT.DET COMP GND
14
ILM
AJ
13
AUDIO
9.0V
Outputs
6
MODE1 3
ACC 5
NC
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TEL 13942296513 QQ 376315150 892498299
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(No.49858)1-17
4.2 IC-PST600M/G/-W (IC702) : System reset
• Block diagram
4.3 K6R1008VDTI10-X (IC451) : 128K x 8 Bit High-Speed CMOS Static RAM
• Pin layout • Block diagram
• Pin function
IN
Vout
GND
1
3
2
OP1
Co1
A0
A1
A2
A3
CS
I/O1
I/O2
VCC
VSS
I/O3
I/O4
WE
A4
A5
A6
A7
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
A16
A15
A14
A13
OE
I/O8
I/O7
VSS
VCC
I/O6
I/O5
A12
A11
A10
A9
A8
Clk Gen. Pre-Charge Circuit
Memory Array
512 Rows
256x8 Columns
Row Select
I/O Circuit
Column Select
Data
Cont.
CLK
Gen.
A0
A1
A2
A3
A4
A5
A6
A7
A8
I/O1to I/O8
CS
WE
OE
A10A9A12A11 A14A13 A16A15
Pin No. Symbol Function
1 to 4 A0 to A3 Address inputs
5CS
Chip select
6,7 I/O1,I/O2 Data inputs/outputs
8 VCC Power (+3.3V)
9 VSS Ground
10,11 I/O3,I/O4 Data inputs/outputs
12 WE Write enable
13 to 21 A4 to A12 Address inputs
22,23 I/O5,I/O6 Data inputs/outputs
24 VCC Power (+3.3V)
25 VSS Ground
26,27 I/O7,I/O8 Data inputs/outputs
28 OE Output enable
29 to 30 A13 to A16 Address inputs
Pin No. Symbol Function
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TEL 13942296513 QQ 376315150 892498299
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1-18 (No.49858)
4.4 LA4743K (IC301) : Power amp.
• Block diagram
11
6 20
1
4
10
15
25
13
14
16
12
9
8
5
7
2
22
17
19
18
21
23
24
3
-
+
-
+
-
+
-
+
-
+
-
+
-
+
-
+
IN 1
IN 2
ST BY
Vcc 1/2 Vcc 3/4
OUT 1+
OUT 1-
PWR GND1
OUT 2+
OUT 2-
PWR GND2
R.F
IN 3
IN 4
PRE GND
ON TIME C Muting &
ON Time Control
Circuit
Protective
circuit
Protective
circuit
Mute
circuit
Ripple
Filter
Stand by
Switch
N.C
+
+
0.22 F
2200 F 0.022 F
0.22 F
TAB
+5V
ST ON
+
+
+
+
47 F
0.22 F
0.22 F
22 F
+
Mute 10K
+
3.3 F
OUT 3+
OUT 3-
Low Level
Mute ON
PWR GND3
OUT 4+
OUT 4-
PWR GND4
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TEL 13942296513 QQ 376315150 892498299
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(No.49858)1-19
•Pinlayout
• Pin function
4.5 NJM4565M-WE (IC581) : CD L.P.F.
•Pinlayout
TAB
GND
FR-
STDBY
FR+
VP1
RR-
GND
RR+
RIPPLE
INRF
INRR
SGND
FLIN
RLIN
DNTIME
RL+
GND
RL-
VP3
FL+
MUTE
FL-
GND
NC
Pin No. Symbol Function Pin No. Symbol Function
1 TAB Header of IC 14 FLIN Front Lch input
2 GND Power GND 15 RLIN Rear Lch input
3 FR- Outpur(-) for front Rch 16 ONTIME Power on time control
4 STDBY Stand by input 17 RL+ Output (+) for rear Lch
5 FR+ Output (+) for front Rch 18 GND Power GND
6 VP1 Power input 19 RL- Output (-) for rear Lch
7 RR- Output (-) for rear Rch 20 VP3 Power input
8 GND Power GND 21 FL+ Output (+) for front
9 RR+ Output (+) for rear Rch 22 MUTE Muting control input
10 RIPPLE Ripple filter 23 FL- Output (-) for front
11 RRIN Rear Rch input 24 GND Power GND
12 FRIN Front Rch input 25 NC Non connection
13 SGND Signal GND
8
7
6
5
4
3
2
1V+
B OUTPU
T
B INPUT
B INPUT
A INPUT
A INPUT
A
OUTPUT
-
V-+
+-
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TEL 13942296513 QQ 376315150 892498299
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1-20 (No.49858)
4.6 LA6574H-X (IC501) : CD driver
• Pin layout & brock daiagram
• Pin function
28 REV
27 FWD
26 S-GND
25 VCONT
24 VIN4
23 VIN4G
22 VCC-S
FR FR
21 VREF-IN
20 REG-OUT
19 REG-IN
18 VIN3G
17 VIN3
16 VIN2G
15 VIN2
VCC2 1
V05- 2
V05+ 3
V04+ 4
V04- 5
V03+ 6
V03- 7
FR FR
V02+ 8
V02- 9
V01+ 10
V01- 11
VCC1 12
VIN1 13
VIN1G 14
POWER supplise
CH5
CH5
CH4
CH3
CH2
CH1
22k
11k
CH1.2.3.4
POWER
Level Shift Level Shift Level Shift Level ShiftOutput Control
22k
11k
22k
3.3VREG (External
PNP Tr)
Signal System Power
22k 11k
Input
Thermal Shutdown
11k
Pin No. Symbol Function
1 VCC2 CH5 power supplies.
2 VO5- Loading output(-)
3 VO5+ Loading output(+)
4 VO4+ CH4 output terminal(+)
5 VO4- CH4 output terminal(-)
6 VO3+ CH3 output terminal(+)
7 VO3- CH3 output terminal(-)
8 VO2+ CH2 output terminal(+)
9 VO2- CH2 output terminal(-)
10 VO1+ CH1 output terminal(+)
11 VO1- CH1 output terminal(-)
12 VCC1 CH1, 2, 3, 4 power supplies
13 VIN1 CH1 input terminal
14 VIN1G CH1 input terminal(for gain adjustment)
15 VIN2 CH2 input terminal
16 VIN2G CH2 input terminal(for gain adjustment)
17 VIN3 CH3 input terminal
18 VIN3G CH3 input terminal(for gain adjustment)
19 REG-IN Regulator terminal
20 REG-OUT Regulator terminal
21 VREF-IN Standard voltage input terminal
22 VCC-S Signal system power
23 VIN4G CH4 input terminal(for gain adjustment)
24 VIN4 CH4 input terminal
25 VCONT CH5 output voltage set terminal
26 S-GND Signal system GND
27 FWD CH5 output switch terminal
28 REV CH5 output switch terminal
Pin No. Symbol Function
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TEL 13942296513 QQ 376315150 892498299
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