JVC KS-FX222 Building instructions
SERVICE MANUAL
COPYRIGHT © 2003 VICTOR COMPANY OF JAPAN, LTD. No.49772
2003/01
KS-FX222
CASSETTE RECEIVER
49772200301
KS-FX222
TABLE OF CONTENTS
1 Important Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
2 Disassembly method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
3 Adjustment method. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12
4 Description of major ICs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-16
Area Suffix
E ---- Continental Europe
EX -------- Central Europe
SEL
S.
BA
SS
D
ISP
SSM
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EX
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TEL 13942296513 QQ 376315150 892498299
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KS-FX222
1-2 (No.49772)
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.
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KS-FX222
(No.49772)1-3
SECTION 2
Disassembly method
2.1 Main body
2.1.1 Removing the front panel assembly
(See Fig.1)
(1) Press the release button and remove the front panel as-
sembly.
Fig.1
2.1.2 Removing the bottom cover
(See Fig.2)
• Prior to performing the following procedure, remove the front
panel assembly.
(1) Turn the body upside down.
(2) Insert a screwdriver under the joints to release the two
joints aon the left side, the two joints bon the right side and
the joint con the back of the body, then remove the bottom
cover from the body.
CAUTION:
When releasing the joint c using a screwdriver, do not
damage the board.
Fig.2
2.1.3 Removing the front chassis
(See Fig.3)
• Prior to performing the following procedure, remove the front
panel assembly and bottom cover.
(1) Remove the screw Aon each side of the body.
(2) Release the two joints dand the two joints eon the sides,
then remove the front chassis toward the front.
Fig.3
Front panel assembly
Release button
Bottom cover
Joint b
Joint b
Joint c
Joint a
Joint a
Joint d
Front chassis
A
Joint e
Joint d Joint e
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KS-FX222
1-4 (No.49772)
2.1.4 Removing the heat sink
(See Fig.4)
• Prior to performing the following procedure, remove the front
panel assembly.
(1) Remove the two screws Band two screws Cattaching the
heat sink on the left side of the body, and remove the heat
sink.
Fig.4
2.1.5 Removing the rear panel
(See Fig.5 )
• Prior to performing the following procedure, remove the front
panel assembly and bottom cover.
(1) Remove the two screws D, two screws Eand three screws
Fattaching the rear panel on the back of the body.
Fig.5
2.1.6 Removing the main board
(See Fig.6)
• Prior to performing the following procedure, remove the front
panel assembly, bottom cover, front chassis, heat sink and
rear panel.
(1) Remove the two screws Gattaching the main board on the
top chassis.
(2) Disconnect the two connectors CN901 and CN721 on the
main board from the cassette mechanism assembly.
Fig.6
Heat sink
CB C
ED
EFF
D
GG
Main board
CN901
CN721
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KS-FX222
(No.49772)1-5
2.1.7 Removing the cassette mechanism assembly
(See Fig.7)
• Prior to performing the following procedure, remove the front
panel assembly, bottom cover, front chassis, heat sink, rear
panel and main board.
(1) Remove the four screws Hattaching the cassette mecha-
nism assembly from the top chassis.
Fig.7
2.1.8 Removing the head amplifier board
(See Fig.8)
• Prior to performing the following procedure, remove the front
panel assembly, bottom cover, front chassis, heat sink, rear
panel, main board and cassette mechanism assembly.
(1) Disconnect the wire from CJ901 on the head amplifier
board.
(2) Remove the one screw Jattaching the head amplifier
board.
(3) Move the head amplifier board in the direction of the arrow
to release the two joints f, the head amplifier board can be
removed.
Fig.8
HH
HH
Top chassis
Cassette mechanism assembly
joint f
J
CJ901
Head amplifier board
To head relay board
joint f
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KS-FX222
1-6 (No.49772)
2.1.9 Removing the relay board
(See Fig.9)
• Prior to performing the following procedure, remove the front
panel assembly, bottom cover, front chassis, heat sink, rear
panel, main board and cassette mechanism assembly.
(1) Disconnect the wire from CP722 on the relay board.
(2) Remove the one screw Kattaching the relay board.
(3) Move the relay board in the direction of the arrow to release
the joint g, the relay board can be removed.
Fig.9
2.1.10 Removing the mecha bracket
(See Fig.10)
• Prior to performing the following procedure, remove the front
panel assembly, bottom cover, front chassis, heat sink, rear
panel, main board, cassette mechanism assembly, head am-
plifier board and relay board.
(1) Remove the four screws Lattaching the mecha bracket.
Fig.10
joint g
K
CP722
Relay board
Mecha bracket
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KS-FX222
(No.49772)1-7
2.1.11 Removing the switch (LCD & key) board
(See Fig.11~13)
• Prior to performing the following procedure, remove the front
panel assembly.
(1) Remove the four screws Mattaching the rear cover on the
back of the front panel assembly.
(2) Release the eleven joints h, the front panel and the rear
cover become separate.
(3) Remove the switch board from the rear cover.
Fig.11
Fig.12
Fig.13
M
M M
M
Joint h
Joint h
Joint h
Joint h
Switch (LCD & Key) board
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KS-FX222
1-8 (No.49772)
2.2 Cassette mechanism assembly
• Prior to performing the following procedures, remove the head
amplifier board, the relay board and the mechanism bracket.
2.2.1 Removing the direction switch board
(See Fig.1)
(1) Unsolder the three wires aon the direction switch board.
(2) Remove the one screw Aattaching the direction switch
board.
2.2.2 Removing the FF / REW lever assembly
(See Fig.1)
(1) Remove the screw Battaching the FF / REW lever assem-
bly on the back of the cassette mechanism assembly.
(2) Remove the screw Con the upper side of the FF / REW
lever assembly.
(3) Lift and pull forward the FF / REW lever assembly to disen-
gage the joints b, c, dand e.
2.2.3 Reattaching the FF / REW lever assembly
(See Fig.1)
(1) Reattach the FF / REW lever assembly to the joint con the
back of the chassis.
(2) Reattach the pinch-roller shaft e, the change lever dand
the return link eto the chassis.
Fig.1
2.2.4 Removing the playback head
(See Fig.2)
• Prior to performing the following procedure, remove the direc-
tion switch board and the FF / REW lever assembly.
(1) Remove the screw Dattaching the playback head.
(2) Remove the Cwasher and pull out the FF roller.
(3) Remove the Ssupport plate, the A arm spring (a) and (b),
the playback head.
ATTENTION:
The A arm spring (a) differs from the A arm spring (b).
2.2.5 Removing the pinch-roller (R) and (F) assembly
(See Fig.2)
• Prior to performing the following procedure, remove the direc-
tion switch board and the FF / REW lever assembly.
(1) Remove the P arm spring (f) in the pinch-roller (F) assem-
bly from the chassis.
(2) Remove the P arm spring (r) in the pinch-roller (R) assem-
bly from the chassis.
(3) Draw out the pinch roller (F) and (R) assembly from the
shaft.
ATTENTION:
The P arm spring (f) differs from the P arm spring (r).
ATTENTION:
The pinch roller (F) assembly differs from the pinch roller (R)
assembly.
Fig.2
C
FF / REW lever assembly
Joint c
Joint b
B
A
Direction switch board
Joint d
Joint e
Soldering a
A arm spring (b) A arm spring (a)
Pinch-roller (R) assembly Pinch-roller (F) assembly
Shaft Shaft
S support plate
D
C washer
P arm spring (f)
P arm spring (r)
Remove the P arm spring (f)
from the chassis.
Remove the P arm spring (r)
from the chassis.
Playback head
FF roller
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KS-FX222
(No.49772)1-9
2.2.6 Removing the cassette hanger / cassette holder
(See Fig.3)
• Prior to performing the following procedure, remove the FF /
REW lever assembly.
(1) From the rear of the unit, bend the two tabs foutwards and
disengage the two joints gin the direction of the arrow.
(2) Push the eject lever and remove the cassette holder from
the playback head. Disengage the two joints hof the cas-
sette hanger / cassette holder and the eject lever in the di-
rection of the arrow.
(3) Lift the cassette hanger / cassette holder and disengage
the joint i of the return link and the eject lever.
Fig.3
2.2.7 Removing the reel disc assembly
(See Fig.4)
• Prior to performing the following procedure, remove the FF /
REW lever assembly and the cassette hanger / cassette hold-
er.
(1) Remove the C washer and pull out reel disc assembly.
ATTENTION:
Replace with a new C washer when reattaching.
Fig.4
2.2.8 Removing the motor assembly
(See Fig.5)
(1) Unsolder the two wires jon the motor assembly.
(2) Turn over the cassette mechanism assembly and remove
the main belt and the sub-belt from the motor pulley.
ATTENTION:
The main belt can now be removed.
(3) Remove the two screws Gattaching the motor assembly.
Fig.5
Cassette holder
Cassette hanger
Return link
Joint i
Eject lever
Joint h
Joint h
Joint g
Joint g Tab f
Tab f
Chassis
Reel disc assembly
C washer
C washer
Flywheel (BF)
Flywheel (BR)
E
E
E
F
G
G
Main-belt
Reel base assembly
Sub-belt
Motor assembly
Motor pulley
Soldering j
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KS-FX222
1-10 (No.49772)
2.2.9 Removing the Flywheel (BF) and (BR) assembly
(See Fig.4 and 5)
• Prior to performing the following procedure, remove the cas-
sette hanger / cassette holder.
(1) From the upper side of the cassette mechanism assembly,
remove the C washer from each shaft of the flywheel (BF)
and (BR).
(2) Turn over the cassette mechanism assembly and remove
the main belt. Pull out the flywheel (BF) and (BR) down-
ward respectively.
Fig.4
Fig.5
2.2.10 Removing the reel base assembly
(See Fig.5 and 6)
(1) Raise the part kof the reel base assembly slightly and re-
move the selector link (B) on the front side of the cassette
mechanism assembly by turning it as shown in Fig.6.
(2) Remove the three screws Eand the one screw Fon the
underside of the cassette mechanism assembly.
ATTENTION:
The reel base assembly is not repairable. Handle with care.
Fig.6
Fig.7
Reel disc assembly
C washer
C washer
Flywheel (BF)
Flywheel (BR)
E
E
E
F
G
G
Main-belt
Reel base assembly
Sub-belt
Motor assembly
Motor pulley
Soldering j
Selector link (B).
Pinch-roller (R) assembly
Turn the selector link (B).
k
Inside of the reel base assembly
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TEL 13942296513 QQ 376315150 892498299
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KS-FX222
(No.49772)1-11
2.2.11 Removing the mute switch board
(See Fig.8)
(1) Unsolder the two wires lon the mute switch board on the
back of the cassette mechanism assembly.
(2) Remove the screw Hattaching the mute switch board.
Fig.8
2.2.12 Removing the power switch
(See Fig.9)
• Prior to performing the following procedure, remove the motor
assembly.
(1) Unsolder the two wires mon the power switch on the side
of the cassette mechanism assembly.
(2) Remove the screw Iattaching the power switch.
Fig.9
Cassette mechanism assembly
Soldering l
HMute switch board
Rower switch
Motor assembly
Soldering m
IPower switch
Cassette mechanism assembly
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TEL 13942296513 QQ 376315150 892498299
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KS-FX222
1-12 (No.49772)
SECTION 3
Adjustment method
AM mode 999kHz/62dB,INT/400Hz,30%
modulation signal on recieving.
FM mono mode 97.9MHz/66dB,INT/400Hz,22.5kHz
deviation pilot off mono
Band
Test instruments reqired for adjustment
Standard volume position
Measuring conditions(Amplifier section)
Frequency band
1. Digital oscilloscoe(100MHz)
2.Frequency counter meter
3.Electric voltmeter
4.Wow & flutter meter
5.Test tapes
6.Torque gauge...................Cassette type for CTG-N
(Mechanism adjustment)
VT724.......................for DOLBY level measurement
VT739............For playback frequency measurement
VT712....For wow flutter & tape speed measurement
VT703.....................For head azimuth measurement
Balance and Bass, Treble volume, Fader
:Center(Indication"0")
Loudness,Dolby NR,Sound,Cruise:Off
Volume position is about 2V at speaker output with
following conditions,Playback the test tape VT721.
Power supply voltage.............. DC14.4V(11V - 16V allowance)
Load impedance............ 4
Ω
(4
Ω
to 8
Ω
allowance)
Line out level/Impedance..............1.0V/20k
Ω
load (250 nWb/m)
FM stereo mode 1kHz,67.5kHz dev.pilot 7.5kHz dev
Output level 0dB(1µV,50Ω/open terminal)
FM: 87.5 MHz to 107.9 MHz
AM : 530 kHz to 1710 kHz
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TEL 13942296513 QQ 376315150 892498299
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KS-FX222
(No.49772)1-13
Information for using a car audio service jig
Disassembly method
1. Remove the front panel assembly.
2. Remove the bottom cover.
3. Remove the front chassis.
4. Remove the two screws D of the rear panel. (Refer to Disassembly method.)
5. Remove the heat sink.
6. Reattach the heat sink with two screws B.
7. Install the front chassis and front panel assmbly.
8. Confirm that current is being carried by connecting an extension cord jig.
Note
Available to connect to the CJ701 connector when installing the front panel.
CAUTION :
Be sure to attach a heat sink on the power amplifier IC of a main board when supplying the power.
If voltage is applied without attaching the heat sink, the power amplifier IC will be destroyed by heat.
1. For 1995 and 1996, we're advancing efforts to make our extension cords common for all car audio products.
Please use this type of extension cord as follows.
2. As a U-shape type top cover is employed, this type of extension cord is needed to check operation of the
mechanism assembly after disassembly.
3. Extension cord : EXTKSRT002-6P ( 6 pin extension cord ) For connection between mechanism assembly
and main board.
4. Check for mechanism driving section such as motor ,etc..
EXTKSRT002-6P
Extension cord
: EXTKSRT002-6P
Front panel assembly
Main board
Cassette mechanism
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KS-FX222
1-14 (No.49772)
Head section view
Head azimuth screw
Cassette mechanism
(Surface)
Tape speed adjust
Motor assembly
Fixed screw
Height adjusting screw
c
Height adjusting screw
b
Height adjusting screw
a
Playback head
Playback head
Azimuth screw
Arrangement of adjusting & test points
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TEL 13942296513 QQ 376315150 892498299
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KS-FX222
(No.49772)1-15
Mechanism adjustment section
Item Adjusting & Confirmation Methods Adjust Std. Value
Head shield
Head shield
The head is at low position
during FWD.
The head is at height position
during REV.
A Line
B Line
Phase
screw (c) screw (a)
screw (b)
Head azimuth
screw Fixed screw
0
°
45
°
1. Head azimuth
2. Tape Speed and
Wow & Flutter
3. Playback
Frequency
response
"Head Height Adjustment"
Note
Adjust the azimuth directly. When you adjust the height
using a mirror tape, remove the cassette housing from the
mechanism chassis.
After installing the cassette housing, perform the azimuth
adjustment.
1. Load the mirror tape ( SCC-1659 ). Adjust with height
adjustment screw (a) and azimuth adjustment screw (b) so
that line "A" of the mirror tape runs in the center between
Lch and Rch in the reverse play mode.
2. After switching from REV to FWD then to REV, check that
the head position set in procedure "1" is not changed.
*If the position has shifted, adjust again and check.
3. Adjust the azimuth screw (b) so that line "B" of the mirror
tape runs in the center between Lch and Rch in the forward
play mode.
"Head Azimuth Adjustment"
1. Load the test tape ( VT724: 1kHz ) and play it back in the
reverse play mode. set the Rch output level to maximum.
2. Load the test tape ( VT703: 10kHz ) and play it back in the
forward play mode. Adjust the Rch and Lch output levels
to maximum, with azimuth adjustment screw (b).
In this case, the phase difference should be within 45°.
3. Engage the reverse mode and adjust the output level to
maximum, with azimuth adjustment screw (c).
*The phase difference should be 45° or more.
4. When switching between forward and reverse modes, the
difference between channels should be within 3dB.
*Between FWD Lch and Rch, REV Lch and Rch.
5. When the test tape ( VT721 : 315Hz ) is played back, the
level difference between channels should be within 1.5dB.
1. Check to see if the reading of the frequency counter & Wow
flutter meter is within 2940-3090 Hz ( FWD/REV ), and less
than 0.35% ( JIS RMS ).
2. In case of out of specification, adjust the motor with a built-
in volume resistor
1. Play the test tape ( VT724 : 1kHz ) back and set the volume
position at 2V.
2. Play the test tape ( VT739 ) back and confirm 0
±
3dB at 1kHz/
8kHz and -4+2dB at 1kHz/125Hz.
3. When 8kHz is out of specification, it will be necessary to
read adjust the azimuth.
Built-in
volume resistor
Tape Speed
2940-3090Hz
Wow&Flutter
Less than
0.35%
(JIS RMS)
Speaker out
1kHz/8kHz
: 0dB_}3dB,
125Hz/1kHz
: -4dB+2dB,
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TEL 13942296513 QQ 376315150 892498299
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KS-FX222
1-16 (No.49772)
SECTION 4
Description of major ICs
4.1 LC75823W (IC651) : LCD driver
• Pin Layout & Symbol
• Pin function
Pin No. Symbol I/O Functions
1 to 7 -- Non connect
8 to 52 S8 to S52 O Common driver output pins. The frame frequency is given by : t0=(fosc/384)Hz.
53 S53 to S55 -- Power supply connection. Provide a voltage of between 4.5 and 6.0V.
57 INH I Display turning off input pin.
INT="L" (Vss) ----- off (S1 to S52, COM1 to COM3="L"
INT="H" (VDD)----- on
Serial data can be transferred in display off mode.
58, 59 Non connect
60 Vss -- Power supply connection. Connect to GND.
61 OSC I/O Oscillator connection.
An oscillator circuit is formed by connecting an external resistor and capacitor at this pin.
62 CE I Serial data interface connection to the controller. CE : Chip enable
63 CLOCK I Serial data interface connection to the controller. CL : Sync clock
64 DATA I Serial data interface connection to the controller. DI : Transfer data
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
S8
S9
S10
S11
S12
S13
S14
S15
S16
17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
S48
S47
S46
S45
S44
S43
S42
S41
S40
S39
S38
S37
S36
S35
S34
S33
64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49
S17
S18
S19
S20
S21
S22
S23
S24
S25
S26
S27
S28
S29
S30
S31
S32
DATA
CLOCK
CE
OSC
Vss
INH
VDD
COM3
COM2
COM1
S52
S51
S50
S49
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TEL 13942296513 QQ 376315150 892498299
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KS-FX222
(No.49772)1-17
4.2 LC72362N-9B39 (IC701) : Micon
•Pinlayout
• Pin functions
41 - 64
24 - 1
25
40
80
64
-
-
Pin
No. Symbol I/O Function
1 XIN I Crystal oscillator
2GND-ToGND
3 J BUS SI I Bus serial data input from CP751
4 J BUS SO O Bus serial data output to CP751
5 J BUS SCK O Bus serial clock output to CP751
6 J BUS I/O SEL O BUS I/O switch signal output
7 NC - Non connect
8 LCD SO O Serial data output to IC651
9 LCD SCK O Serial clock output to IC651
10 LCD CE O Chip enable output to IC651
11 NC - Non connect
12 E.VOL SO O Serial data output
13 E.VOL SCK O Serial clock output
14 CE - Chip enable output
15 TUNER ILLUM - Non connect
16 TAPE ILLUM - Non connect
17 CD ILLUM - Non connect
18 DIMMEROUT - Non connect
19 NC - Non connect
20 NC - Non connect
21 NC - Non connect
22 NC - Non connect
23 NC - Non connect
24 NC - Non connect
25 KS1 - Non connect
26 KS0 O Initializing output port
27 K3 I Initializing input port
28 K2 I Initializing input port
29 K1 - Non connect
30 K0 I Initializing input port
31 Vdd - Power supply
32 TEST I Test iput
33 NC - Non connect
34 SEEK/STOP O Output the "If signal request"
35 MONO O Monaural and stereo change over
output
36 R/T - Non connect
37 NC - Non connect
38 POWER CNT O Power control output
39 NC - Non connect
40 NC - Non connect
41 IF CONT - Non connect
42 NC - Non connect
43 NC - Non connect
44 NC - Non connect
45 NC - Non connect
46 NC - Non connect
47 NC - Non connect
48 TAPE IN I H:RADIO L:TAPE
49 F/R SENCE I FORWARD/REVERSE switch de-
tector
50 TAPE MUTE I DIR.FF/REW.MUTE
51 SD/ST I Station detector and ST input
52 NC - Non connect
53 DETACH I Detection of Front Panel
54 NC - Non connect
55 J BUS INT I BUS interruption signal detection
communication
56 REMOCON - TO GND
57 FM/AM I Change over the FM/AM iuput
58 DOLBY - Non connect
59 NC - Non connect
60 MUTE - The mute time is controlled by the
connected
61 MEMORY DET I Memory detector input
62 LEVEL METER I -----
63 SMETER I Signal meter input
64 KEY 2 I Momentary key input
65 KEY 1 I Momentary key input
66 KEY 0 I Momentary key input
67 ACCDET I ACC DET
68 SENS - To GND
69 NC I Non connect
70 FM/AM IF COUNT - AM/FM Frequency detection
71 NC - Non connect
72 NC - Non connect
73 Vdd I Power supply
74 AM OSC I Input the local oscillator signal of
AM
75 FM OSC - Input the local oscillator signal of
FM
76 Vss - Power supply
77 NC - Non connect
78 EO - PLL Error signal output
79 TEST 1 O To GND
80 XOUT O Crystal oscillator
Pin
No. Symbol I/O Function
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TEL 13942296513 QQ 376315150 892498299
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KS-FX222
1-18 (No.49772)
4.3 LC75421M-X (IC931): E. volume
• Pin layout
• Block diagram
36 ~ 19
1 ~ 18
34
33
32
31
30
29
28
27
26
25
24
23
222120
19
18
17
1615
14
13
12
11
10
9
8
7
6
5
4
32136 35
CCB
INTERFACE
CONTROL
CIRCUIT
LOGIC
CIRCUIT
CONTROL
CIRCUIT
LVref
RVref
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TEL 13942296513 QQ 376315150 892498299
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KS-FX222
(No.49772)1-19
• Pin functions
Pin No Symbol Function
1 DI Serial data input terminal for control
2 CE Chip enable terminal
3 VSS GND
4 LROUT Rear Lch fader output terminal
5 LFOUT Front Lch fader output terminal
6 LFIN Front Lch input terminal
7 LOUT C & R connection terminal for super bass band
8 LSB C & R connection terminal for super bass band
9 LBASS2 C & R connection terminal for bass band
10 LBASS1 C & R connection terminal for bass band
11 LTRE Capacitor connection terminal for treble band filter
12 LIN Lch input terminal
13 LSELO Input selector output terminal
14 L5 input signal terminal
15 L4 input signal terminal
16 L3 input signal terminal
17 L2 input signal terminal
18 L1 input signal terminal
19 Vref Power supply for analog GND
20 R1 input signal terminal
21 R2 input signal terminal
22 R3 input signal terminal
23 R4 input signal terminal
24 R5 input signal terminal
25 RSELO Input selector output terminal
26 RIN Rch input terminal
27 RTRE Capacitor connection terminal for treble band filter
28 RBASS1 C & R connection terminal for bass band filter
29 RBASS2 C & R connection terminal for bass band filter
30 RSB C & R connection terminal for super bass band filter
31 ROUT C & R connection terminal for super bass band filter
32 RFIN Rch input terminal
33 RFOUT Front Rch fader output terminal
34 RROUT Rear Rch fader output terminal
35 VDD Power supply terminal
36 CL Serial clock output terminal for control
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TEL 13942296513 QQ 376315150 892498299
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KS-FX222
1-20 (No.49772)
4.4 AN80T05LF (IC781) : Regulator
• Pin layout & Block diagram
• Pin function
4.5 UPC1228HA (IC901) : Head amp
• Pin layout & Block diagram • Pin function
Pin No. Symbol Function
1 ILL 10V power supply for illumination.
2 MODE2 When 5V is input,becomes AM. and the antenna output is turned on.
3 MODE1 When 5V is input,becomes AM. and the output of FM is switched.
4 STB When 5V is input outputs to ILL,COM and AMP. It is 0V usually.
5 VDD 5.6V power supply.
6 AMP Power supply supply to remote amplifier
7 VCC Back up. connects with ACC with it.
8 ANT Power supply supply to auto antenna.
9 COM 8.7V power supply.
10 AM The power supply of 8.7V to AM.
11 FM The power supply of 8.7V to FM.
12 GND Ground
Pre
Drive
Thermal
Protection
Reference Voltage
Pre
Drive
AMP
Out
ASO & Peak
Current Protection
AMP
Out
Pre
Drive Pre
Drive
Pre
Drive
123456789101112
ILL
10V
MODE2 MODE1 STB VDD
5.6V
AMP VCC ANT COM
8.7V
AM
8.7V
FM
8.7V
GND
1
AMP1 AMP2
2345678
Pin No. Symbol
1 Input 1
2 Negatice feed back 1
3 Output 1
4 Power supply; +Vcc
5 Ground
6 Output 2
7 Negative feed back 2
8 Input 2
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TEL 13942296513 QQ 376315150 892498299
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