Jvc RC-BX33-SL Service Manual

RC-BX33SL

SERVICE MANUAL
PORTABLE CD SYSTEM
Area Suffix
UX---Saudi and relative U---Except ux
IMPORTANT
PLEASE TAKE NOTE BEFORE ORDERING
1. Order all service parts through JVC Asia Pte Ltd.- Customer Satisfaction Dept.
2. Two orders are available: Initial order and last order (Before End Of Line)
3. Minimum order quantity: 100pcs
4. Delivery term: Minimum 2 months upon confirmation of order.
Contents
Safety precautions ............................................................ 1-2
Preventing static electricity ...............................................1-3
Disassembly method .........................................................1-4
Adjustment method............................................................ 1-7
Description of major IC .................................................. 1-13
COPYRIGHT

2001 JVC ASIA PTE LTD

No: 28208
DEC. 2001
RC-BX33SL
Safety precautions
1. This design of this product contains special hardware and many circuits and components specially for safety purposes. For continued protection, no changes should be made to the original design unless authorised in writing by the manufacturer. Replacement parts must be identical to those used in the original circuits. Services should be performed by qualified personnel only.
2. Alterations of the design or circuitry of the product should not be made. Any design alterations of the product should not be made. Any design alterations or additions will void the manufacturer’s warranty and will further relieve the manufacture of responsibility for personal injury or property damage resulting therefrom.
3. Many electrical and mechanical parts in the products have special safety-related characteristics. These characteristics are often not evident from visual inspection nor can the protection afforded by them necessarily be obtained by using replacement components rated for higher voltage, the Parts List of Service Manual. Electrical components having such features are identified by shading on the schematics and by ( ) on the Parts List in the Service Manual. The use of a substitute replacement which does not have the same safety characteristics as the recommended replacement parts shown in the Parts List of Service Manual may create shock, fire, or other hazards.
4. The leads in the products are routed and dressed with ties, clamps, tubing’s, barriers and the like to be separated from live parts, high temperature parts, moving parts and/or sharp edges for the prevention of electric shock and fire hazard. When service is required, the original lead routing and dress should be observed, and it should be confirmed that they have been returned to normal, after re-assembling.
5. Leakage current check (Electrical Shock hazard testing) After re-assembling the product, always perform an isolation check on the exposed metal parts of the product (antenna terminals, knobs, metal cabinet, screw heads, headphone jack, control shafts, etc.) to be sure the product is safe to operate without danger of electrical shock. Do not use a line isolation transformer during this check.
Plug the AC line cord directly into the AC outlet. Using a “Leakage Current Tester”, measure the
leakage current from each exposed metal parts of the cabinet, particularly and exposed metal part having a return path to the chassis, to a known good earth ground. Any leakage current must not exceed 0.5mA AC (r.m.s.)
Alternate check method
Plug the AC line cord directly into the AC outlet. Use an AC voltmeter having, 1,000 ohms per volt or more sensitivity in the following manner. Connect a 1,500
0.15µF AC-type capacitor between an exposed metal part and a known good earth ground. Measure the AC voltage across the resistor with the AC voltmeter. Move the resistor connection to each exposed metal part, particularly any exposed metal part having a return path to the chassis, and measure the AC voltage across the resistor. Now, reverse the plug in the AC outlet and repeat each measurement. voltage measured Any must not exceed 0.75 V AC (r.m.s.). This corresponds to 0.5 mA AC (r.m.s.).
0.15µF AC TYPE
1500
XL-SV320SL/SV305GD
XL-SV308BU
10W resistor paralleled by a
AC Voltmeter (Having 1000 ohms/volts, or more sensitivity
Place this probe on each exposed
10W
metal part.
Good earth ground
Warning
1. This equipment has been designed and manufactured to meet international safety standards.
2. It is the legal responsibility of the repairer to ensure that these safety standards are maintained.
3. Repairs must be made in accordance with the relevant safety standards.
4. It is essential that safety critical components are replaced by approved parts.
5. If mains voltage selector is provided, check setting for local voltage.
! CAUTION Burrs formed during moulding may be left over on some parts of the chassis. Therefore, pay attention to such burrs in the case of performing repair of this system.
1-2
RC-BX33SL
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.
1.1. 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.
1.1.1. Ground the workbench
1. 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.
1.1.2. Ground yourself
1. Use an anti-static wrist strap to release any static electricity built up in your body.
(caption) Anti-static wrist strap
Conductive material (conductive sheet) or iron plate
1.1.3. Handling the optical pickup
1. 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.)
2. 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.
1.2. Handling the traverse unit (optical pickup)
1. Do not subject the traverse unit (optical pickup) to strong shocks, as it is a sensitive, complex unit.
2. Cut off the shorted part of the flexible cable using nippers, etc. after replacing the optical pickup. For spe­cific details, refer to the replacement procedure in the text. Remove the anti-static pin when replacing the traverse unit. Be careful not to take too long a time when attaching it to the connector.
3. Handle the flexible cable carefully as it may break when subjected to strong force.
4. It is not possible to adjust the semi-fixed resistor that adjusts the laser power. Do not turn it.
1-3
RC-BX33SL
Disassembly method
Removing the rear panel
1.
From behind the body, remove the Five screws
A
retaining the rear panel.
2.
Open the Battery door, then remove One Screw
B
retaining in the battery compartment
bottom side.
3
Then remove the Two screws
C
retaining the bottom of rear panel.
4
Take out the rear panel from the body. And disconnect the CN302 on the main board
right side.
Note:
Be careful of the FM antenna white wire, it is connection with the tuner PCB up side.
You can directly take out from the tuner PCB.
When you re-assembly the product, plug the FM antenna white wire into the Tuner
PCB'S "FM ANT" position.
Screw A.
Screw A.
Screw C.
Screw C.
Screw B.
1-4
RC-BX33SL
Removing the Main Board PCB (1)
1.
Open & remove the rear panel
2.
Remove the Two Screws
D
on the Black Backet,
then take out the black backet on the
front panel.
Screws D.
3
Remove the Two Screws
E
retaining on the
left of front panel.
Screws E.
4
Remove the One Screw
F
retaining on the
right of front panel.
Top panel
Screw F.
1-5
RC-BX33SL
Removing the Main Board PCB (2)
5
Disconnect the CN201, CN202 & C301 on the top of the
Main Board PCB.
Front Panel
CN 201
CN 202
Main PCB
CN 301
Top Panel
6
Then, take out the top panel from the front panel.
7
Remove the nine screws
G
from the Main Board PCB.
Screw G.
Screw G.
Screw G.
8
Take out the Main Board PCB from the front panel, & disconnect the CN901 & CN903
on the Main Board PCB.
1-6
RC-BX33SL
Adjustment method
Measurement instruments required for
Tuner section
adjustment
The input and output earth systems are separated.
1 Low frequency oscillator Reference measurement ----- 26.1mV(0.63/8)
This oscillator should have a capacity to output output 0dB to 600 at an oscillation frequency of Input positions ----- AM : Standard loop antenna 50Hz-20KHz FM : TP1 (hot) and TP2 (GND)
2 Electronic voltmeter 3 Distortion meter Precautions for measurement 4 Frequency counter 1 Direct connect to the IF sweeper output 5 Wow & flutter meter side and 1UF and 22 Kohm connect to the 6 Test tape sweeper input side. Same as FIG1.
TCC-112: Tape speed and running unevenness (3KHz) 1 U TCC-140: Reference level (1KHz) IC101 TP16 TCC-182A: Head angle (8KHz), playback frequency PIN18 22 K characteristics (1KHz) and dubbing frequency TP8 characteristics (125Hz and 8KHz)
7 Blank tape 2 The IF sweeper output level should be made as
TYPE I : TDK-D60 low as possible within the adjustable range.
3 Since the IF sweeper is a fixed device, there is
8 Torque gauge : For play and back tension no to adjust this sweeper.
FWD(CT-120m), and FF/REW(CT-F) 4 Since a ceramic oscillator is used, there is no
need to perform any MIX adjustment.
Measurement conditions 5 Since a fixed coil is used, there is no need to
adjustment the FM tracking. Power supply voltage -------------- AC120V (60Hz) 6 Reference output -------------- Speaker : 0.63V/8 In case of simultaneously measuring the voltage Headphone : 0.245V/32 in both of the input and output systmes with and
electronic voltmeter for two channels, therefore,
the earth should be connected particularly Input for confirming recording and ------- CD : -10dB carefully. playback characteristics 7 For connecting a dummy resistor when measuring Measurement output terminal ------- Speaker CN301 the output, use the wire with a greater code size. * Load resistance -------------------------------------- 8 8 Whenever any mixed tape is used, use the band
pass filter (DV-12V). Radio Input signal
AM frequency -------------------------------- 400Hz AM modulation ---------------------------------- 30% FM frequency --------------------------------- 1 KHz FM frequency deviation ------------------ 22.5KHz
1-7
RC-BX33SL
TAPE DECK ADJUSTMENTS
1
HEAD AZIMUTH ADJUSTMET
2
AC BIAS FREQUENCY ADJUSTMENTS
3
TAPE SPEED ADJUSTMENT
Insert the test tape(MTT-111N,3,000 HZ)
CASSETTE MECHANISM SECTION
CASS DECK
P/R HEAD
( 1 ) Load the test tape TCC-182A 8KHz for azimuth
adjustment.
( 2 ) Press the PLAY button.
Use a cross-tip screwdriver to turn the screw for azimuth ( 3 ) adjustment so that the left and right output are maximized ( 4 ) Press the STOP button ( 5 ) After completion of the adjustment. Use thread lock(TB-1401B)
to secure the azimuth-adjustment screw.
( 1 ) Connect frequency counter to CN201(BS); ( 2 ) R/P swith in recording state; ( 3 ) Adjusting T201 use a plastic screwdriver, AC bias frepuency;62+-1KHZ..
( 1 ) ( 2 ) Press the PLAY button. ( 3 ) Use a flat-tip screwdriver to turn the MOTOR VR
adjust MOTOR VR so that the frequency counter become 3,000Hz
1-8
HEAD AZIMUTH ADJUSTING SCREW
RC-BX33SL
Tape recorder section
Items
Confirmation Test tape 1 Playback the test tape TCC-182A (8KHz) Maximum Adjust the head of head angle :TCC-182A(8KHz) 2 With the recording & playback mechanism, output azimuth screw
Confirmation Test tape Adjust VR401 so that the frequency counter Tape speed MOTOR VR of tape speed :TCC-112(3KHz) reading becomes 3,010Hz +/-15Hz when of deck
Measurement
conditions Values positions
Measurement output adjust the head azimuth screw so that the only terminal left and right output levers become :Speaker terminal maximum, After adjustment, lock the Sparker R head azimuth at least by half turn. (Load resistance:8) :Headphone terminal
Measurement output playing back the test tape TCC-112 (3KHz) :3,010Hz terminal with playback and recording mechanism +/-15Hz :Headphone terminal after ending forward winding of the tape.
Measurement method
Standard Adjusting
Reference Values for Confirmation Items
ITEMS
Wow & flutter Test tape When the test tape TCC-112 (3KHz) has been 0.25% or
Measurement
conditions Values positions
:TCC-112(3KHz) played back with the recording and playback less
mechanism at the beginning of forward (WRMS) Measurement output winding, the frequency counter reading of terminal wow & flutter should be 0.25% or less :Headphone terminal (WRMS).
Measurement method
Standard Adjusting]
1-9
RC-BX33SL
Electrical Performance
Reference Values for Electrical Function Confirmation Items
2 With the recording and playback
ITEMS
Adjustment of * Mode: PB mode 1 With the recording and playback mechanism, recording bias * Recording mode load the test tapes TDK-D60, and set the TDK-D60 current * Test tape: TDK-D60 mechanism to the recording and pausing 4.5A (Reference condition in advance . +/-0.5A Value) * Measurement output
Adjustment of * Reference frequency 1 with the recording and playback mechanism, Output recording and :1KHz and 8KHz load the test tapes (TDK-D60) and set the deviation playback (REF.:- 10dB) mechanism to the recording and pausing between frequency * Test tape: TDK-D60 condition in advance. 1KHz and
characteristics 8KHz
Measurement
conditions Values positions
terminal 2 After connecting 100ohms in series to the :Both recording and recorder head, measure the bias current headphone terminals with a valve voltmeter at both of the
terminals
* Measurement input 2 While repetitively inputting the reference :-1dB +/-2dB terminal: OSC IN frequency signal of 1KHz and 8KHz from
OSC IN, record and playback the tape.
Measurement method
Standard Adjusting
3 While receding and playback the test tape Lch and Rch so that the output deviation between 1KHz and 8KHz becomes
-1dB +/-2dB
Items
Recording * Playback 1 While changing over to and form BIAS 1 62KHz T201 bias * Test tape: TDK-D60 and 2, confirm that the frequency is +/-6KHz frequency changed
Measurement
conditions Values positions
* Measurement terminal : BIAS TP on mechanism, load the test tape. P.C. board (TDK-D60 ) , and set the
mechanism to the recording and pausing condition in advance. 3 Confirm that the BIAS TP frequency on the P.C. board is 62KHz +/-6KHz
Measurement method
Standard Adjusting]
1-10
Flow of functional operation until TOC read
Check that the voltage at the pin
focus A-curve amplitude
RC-BX33SL
Check Point
Power Key
Slider turns
REST SW ON.
17 of CN901 is OV (a moment)?
Automatic tuning
of TE offset
Laser ON
Check that the voltage at the pin1 of IC902 + side is + 5V?
Detection of disc
Auto tuning of
Focus offset
Confirm that the Focus error
Auto. measurement of
s-cuve signal at the pin16 of IC902 is approx.2V p-p
Confirm that the signal from
TE waveform at TOC reading pin14 IC902 is 0V as a
pin 25 of IC601(TE)
Approx 3sec
Disc is rotated
accelerated pulse during approx.400ms
Focus servo ON
VREF
Approx
1.8V
Trackin g servo
Tracking servo on statues
Disc to be braked to stop
(Tracking servo ON)
Auto. measurement of
Tracking error amplitude
Confirm the waveform of the Tracking error signal at the pin14 of IC902 (R926) (See fig-1)
Disc status to rotate
Auto measurement of TE amplitude and auto tuning of TE balance
TOC reading
finishes
500mV/div 2mS/div Fig.1
Automatic tuning of
Tracking error
Automatic tuning of
Automatic tuning of
Focus error gain
Automatic tuning of
Tracking error gain
TOC reading
Play a disc
Confirm the eys-pattern at the lead of TP1
1-11
RC-BX33SL
TUNER ADJUSTMENTS
use a plastic screw driver for adjustments. Adjust the intermediate frequency of AM and FM to the frequency of ceramic filter Supply voltage : DC 12.0 V Speaker impedance : 8 OHMS
Function switch : RADIO
.
a. AM Adjustment BAND SELECT SWITCH :AM
ste Adjusting Tuning Input Connection Output Connection Adjustment Oscilloscope
circuit Frequency Measurement input Measurement output parts
1 IF 1000 KHz AM Sweep Loop
(455 / 465KHz) Generior ANT Oscilloscope
2 Tuning 520KHz 3 Coverage 1640/1740 KHz -- -- Oscilloscope
4 600 KHz AM Signal Loop 5 1400 KHz Generior ANT Oscilloscope
b. FM Adjustment BAND SELECT SWITCH :FM FM Dummy Antenna : 75 ohm unbalance
ste Adjusting Tuning Input Connection Output Connection Adjustment Oscilloscope
circuit Frequency Measurement input Measurement
1 IF FM Sweep TP4(H)
(10.7 MHz) 98.0 MHz Generator TP3(E) Oscilloscope
2 Tuning 87.4 MHz 3 Coverage 108.3 MHz -- FM ANT. Oscilloscope
TP4(H) T105 TP8(E)
(Non-adjustment)
TP4(H) T102 TP8(E) PVC4
TP4(H) MW COIL TP8(E) PVC3 Maximum
output parts TP4(H) T104 TP8(E) T106
(Non-adjustment)
TP4(H) L104 TP8(E)
PVC2
4 90.0 MHz FM Signal FM ANT 5 Tracking 106.0 MHz Generator TP1 (E) Oscilloscope
TP2(H) sensitivity
1-12
TP4(H) TP8(E)
L103 Confirm with being
PVC1 near by effective
Major ICs Description
LA1824
RC-BX33SL
24 23 22 21 18 16 15 14 13
FM
RF
FM MIX
AM
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
MIX
AM
OSC
Function
Function
AM-RF input
AM-RF input
Reg
Reg
AM-OSC
AM-OSC
VCC1
VCC1
FM-MIX output
FM-MIX output
GND1
GND1
AM-MIX output
AM-MIX output
Tuning in
Tuning in
AM
RF
REG VCC1
1 2 3 4 5 6 7 8 9 10 11 12
Pin No.
Pin No.
VCC2GND2
dicator
dicator
20
FM
OSC
Pin No.
Pin No.
10
10
11
11
12
12
13
13
14
14
15
15
16
16
19 17
TRIG
GND1
Function
Function
9
9
AM-IF output
AM-IF output
FM-IF input
FM-IF input
AM-IF input
AM-IF input
AM-AGC
AM-AGC
FM-DET
FM-DET
Pilot detector filter
Pilot detector filter
AM/FM Switch
AM/FM Switch
L output
L output
ST SW
DECODER
VCO FF FFFF
Pin No.
Pin No.
17
17
18
18
19
19
20
20
21
21
22
22
23
23
24
24
ST
LED
Function
Function R output
R output
MPX input
MPX input
AM/FM detector output
AM/FM detector output
FM-OSC
FM-OSC
VCC2
VCC2
FM-RF output
FM-RF output
GND2
GND2
FM-RF input
FM-RF input
TUN LED
PHASE
COMP
S-METER
FM
IF
PILOT
DET
DET
AM-IF
DET
AGC
LA4227
VCC OUT1 BS1 PWR GND (TAB) NF1 IN1 PRE GND
11 9 7
12 10
Rf1
20KOHM
Ch1
THERMAL SHUT DOWN PROTECTION
STANDBY
SW
Ch2
20KOHM
Rf2
2
1
STANDBY OUT2 BS2 PWR GND (TAB) NF2
1
1
2
2
3
3
4
4
5
5
6
6
3
STANDBY
STANDBY
OUT2
OUT2
BS2
BS2
NF2
NF2
IN2
IN2
DC(FILTER)
DC(FILTER)
RNF1
­+
+
-
RNF2
7
7
PRE GND
PRE GND
8
8
IN1
IN1
9
9
NF1
NF1
10
10
BS1
BS1
11
11
OUT1
OUT1
12
12
VCC
VCC
8
62KOHM
BIAS
CIRCUIT
62KOHM
4 6
5
IN2 DC(FILTER)
1-13
RC-BX33SL
TA2092N
9
10
10
11
11
12
12
13
13
14
14
15
15
16
16
9
OUT(+)2
OUT(+)2
PVCC2
PVCC2
OUT(-)2
OUT(-)2
PW GND
PW GND
PW GND
PW GND
OUT(-)3
OUT(-)3
PVCC3
PVCC3
OUT(-)3
OUT(-)3
17
17
18
18
19
19
20
20
21
21 22
22
23
23
24
24
VIN3
VIN3
SGND
SGND
SVCC1
SVCC1
VIN4
VIN4
OUT(+)4
OUT(+)4
PVCC4
PVCC4
OUT(-)4
OUT(-)4
PW GND
PW GND
PW GND
PW GND
1
1
OUT(-)1
OUT(-)1
2
2
PVCC1
PVCC1
3
3
OUT(+)1
OUT(+)1
4
4
VIN1
VIN1
5
5
Vr1
Vr1
6
6
Vc1
Vc1
7
7
VIN2
VIN2
8
8
1-14
36pF
RC-BX33SL
16
17
18
19
20
21
22
24
25
27
23
26
28
10pF
20K
- +
­+
11K
60K
­+
11K
20K
AGC Amp.
20K
100K
100
15K
3pF
15K
10K
10K 30K
20K
12K
-
12K
+
20K
100K
BOTTOM
PEAK
90K
21.82K
+
-
­+
60K 60K
­+
­+
+
-
48K
2.9K
SW3
13K
238K
15pF
238K 15pF
20K 150K
30K
­+
3pF
83K
SW2
+
-
-+­+
10K
3 STATE
150K
20K
DET
1.4K
2.26K
­+
50K
-
15
+
+
14
-
13
10pF
12
11
SW1
1K
40pF 1K
40pF
10
9
8
I-I
7
I-I
6
5
1K
4
3
29
30
Pin No.
Pin No.
1
1
2
2
3
3
4
4
5
5
6
6
-
+
Function
Function
VCC
VCC
RFGC
RFGC
GMAD
GMAD
FNI
FNI
FPI
FPI
TPI
TPI
Pin No.
Pin No.
7
7
8
8
9
9
10
10
11
11
12
12
Function
Function
TNI
TNI
MDI
MDI
LDO
LDO
SEL
SEL
TEB
TEB
2VRO
2VRO
Pin No.
Pin No.
13
13
14
14
15
15
16
16
17
17
18
18
Function
Function
TEN
TEN
TEO
TEO
SBAD
SBAD
FEO
FEO
FEN
FEN
SEB
SEB
Pin No.
Pin No.
19
19
20
20
21
21
22
22
23
23
24
24
Function
Function
VRO
VRO
RFRP
RFRP
BTC
BTC
RFCT
RFCT
PKC
PKC
RFRPIN
RFRPIN
Pin No.
Pin No.
25
25
26
26
27
27
28
28
29
29
30
30
2
1
Function
Function
RFGO
RFGO
GVSW
GVSW
AGCIN
AGCIN
RFO
RFO
GND
GND
RFN2
RFN2
1-15
RC-BX33SL
JVC Asia Pte Ltd
101 Thomson Road, #28-04 United Squares, Singapore 307591
(No: 28208)
Printed in Singapore
200104(L)
RC-BX33SL
SERVICE MANUAL
PORTABLE CD SYSTEM
Area Suffix UX---Saudi and relative U---Except UX
IMPORTANT
PLEASE TAKE NOTE BEFORE ORDERING
1. Order all service parts through JVC Asia Pte Ltd.- Customer Satisfaction Dept.
2. Two orders are available: Initial order and last order (Before End Of Line)
3. Minimum order quantity: 100pcs
4. Delivery term: Minimum 2 months upon confirmation of order.
Contents
Block diagram ...................................................................2-2
Wiring diagram .................................................................2-3
Schematic diagram ........................................................... 2-4
Printed circuit boards .......................................................2-6
COPYRIGHT

2001 JVC ASIA PTE LTD

No: 28208sch
DEC. 2001
BLOCK DIAGRAM
FM ANT
RC-BX33SL
DISC
REM
R/P HEAD
BPF
AM ANT
L R/P
FM RF
FM OSC
FM F/E, IF/DET/MPX
AM RF/IF/DET
(IC101 LA1824)
AM OSC
IC 201 TA2068
R/P PRE.AMP
SIGAL R/P SLECT. SW
TU-5V REG.
OPTICAL PICKUP
IC902
TA2153FN
HEAD AMP
IC903
TA2092N
MOTER DRIVER
CASS. DECK
LEAF - SW
IC902
TA9457F
(DSP/MCU)
LCD
IC301 LA4227
POWER AMP
KEY
CD DOOR LEAF - SW
L. SPEAKER
ERASE HEAD
R R/P
R/P SW
CD SW
CD SW
2-2
Q401
8V REG
R. SPEAKER
DC SUP
SW
Wiring Diagram
RCRC-BX33SL
2-3
Circuit Diagram -1
RC-BX33SL
2-4
Circuit Diagram -2
RC-BX33SL
2-5
Printed Circuit Boards
RC-BX33SL
2-6
RC-BX33SL
JVC Asia Pte Ltd
101 Thomson Road, #28-04 United Squares, Singapore 307591
(No: 28208)
Printed in Singapore
200104(L)
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