Jvc XLM 309 TN Service Manual

Page 1

XL-MSOQTN
XL-M4OSBK
XL»M409TN

JVD
SERVICE MANUAL

XL-M309TN
XL-M408BK
0 XL-M409TN [333%

DIGITAL AUDIO

XL-M409TN/XL-M4OBBK

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Contents

Safety Precautions ....................... 1-2 Initial Operetion Mechanism ............ 1-37

Important for Laser Products ............. 1-3 Operation check by each swith .......... 1-40

Instruction Book ....................... 1-4 Flow of Functional Operation

Discription of Major LSIs ............... 1-24 Until TOC is Read ........ 1-41

Internal Block Diagrams of Other ICs 1-31 Troubleshooting ........................ 1-42

Internal Connection Block Diagrams .................... Insertion
for the FL Display Tube 1-32 Schematic Diagrams ................ Insertion

Disassembly Procedures ................. 1-33 Printed Circuit Board Insertion

. Adjustment Procedures ................. 1-35 Exploded View of Assemblies and
Maintenance of Laser Pickup ........... 1-36 Application Points for Grease . Insertion
Replacement of Laser Pickup ........... I-36 Parts list ..................... Insertion
No.20380

Dec.199 2

Page 2

XL-M 309TN
XL-M4083K
XL-M409TN

-$afety Precautions

1. The 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 authorized 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.

.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.

.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, wattage, etc. Replacement parts which have these special safety
characteristics are identified in the Parts List of Service Manual. Electrical components
having such features are identified by shading on the schematics and by (A) on the Parts
List in the Service Manual. The use of a substitute repalcement 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.

.The leads in the products are routed and dressed with ties, clamps, tubings, 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.

. Leakage currnet 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,
contorl 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.

0 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
any 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.).

0 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 1,5000 10 W
resistor paralleled by a 0.15 ,uF AC-type capacitor between an exposed metal part and a
known good earth ground.

AC VOLTMETER

kw

Measure the AC voltage across the resistor 4
with the AC voltmeter. a Lia/wagon. . _
Move the resistor connection to each exposed o 0_ °' '°'9 senst'v'tfl
metal part, particularly any exposed metal part
having a return path to the chassis, and 0.15»: AC TYPE
meausre the AC voltage across the resistor. -||-
Now, reverse the plug in the AC outlet and 319*
repeat each measurement. Any voltage W >gg3h223md
measured must not exceed 0.75VAC (r.m.s.). 15°09 10 metal part
This corresponds to 0.5 mA AC (r.m.s.). Good earth ground

-Warning

. This equipment has been designed and manufactured to meet international safety standards.
. It is the legal responsibility of the repairer to ensure that these safety standards are

maintained.

. Repairs must be made in accordance with the relevant safety standards.
. It is essential that safety critical components are replaced by approved parts.
. lf mains voltage selector is provided, check setting for local voltage.

1-2 (No.20380)

Page 20

XL-M309TN
XL-M408BK
XL-M409TN

fl

VARIOUS PLA YBACK OPERATIONS

6. When the remelning time is not long enough to program any
more tracks, press the I STOP/CANCEL button.
Intro scan playback stops and the display shows the last program
step.
Last program step 0! side A

Remaining time at side A

I Once you program 16 steps. intro scan playback stops and no
more tracks can be programmed.

.1

To program tracksfor sidoB. press the SIDE Alfibutton so that
the SIDE-B indicator lights on the dlsplay and repeat steps 4
through 6.

When total playing tlme of the programmed tracks has
exceeded the specified time:

Intro scan playback stops and the excess time display blinks. in this
case. press the l STOP/CANCEL button todeletethelastprograrnmed
step so that the tracks fit within the speciiled time

Page 17

1-20 (No.20380)

Operations after editing tracks

To record the programmed tracks

1. Set the cassette deck to record-standby mode.

2, Press the PLAY >III PAUSE button to start edit program play.
If this unit and the cassette deck are connected with the COMPU
LINK terminals. the cassette deck enters record mode automati-
cally. When the program lor side A finishes piaying, this unit and
cassette deck enter pause mode. Set the cassette deck for
recording of side 8, and press the PLAY >/II PAUSE button of this
unit to start playback of side B. The cassette deck enters record
mode automatically.

To check the program contents

Each time the CALL button is pressed, the program contents are

displayed in the programmed order.

a When the unit is in playback mode. press the l STOP/CANCEL
button to enter stop mode and then operate the CALL button.

To modify the program contents

Press the CALL button until the display shows the program step to be

corrected. Enter the new track number with the numeric buttons or the

SEARCH m/bbi buttons. When the SEARCH H4 or >>r button is

used, be sure to press the MEMORY button after selecting the track

number.

To delete a program step, press the CALL button until the display

shows the program step to be deleted and then press the I STOP/

CANCEL button.

0 When the unit is in playback mode. press the l STOP/CANCEL
button to enter stop mode and then delete the program step.

To clear the entire program
Change the playback mode With the PLAY MODE button or eject the
magazine and single disc tray. The program contents will be cleared.

Page 32

XL-M309TN
XL-M4OSBK
XL-M409TN

Internal Connections of FL Display Tube

I ELU0001-132 (FL201)
1. Grid Layout

106 86 66 46 26
Ix: CONTINUE R 1 PRGM EDIT SiDE - A
2.x. PROGRAM i> HI] EPEBTSC INTRO EDIT SIDE-B
RANDOM TRACK
4 I__'l DEL.PRGM STEP EACH REMAIN
3': DDRP a
2'-"1 f b _ O
12:1 AUTO e c H E o
CLOSE
I:
P IIIIZIEI EEIEJ IIEI IE!
96 7G 56 3G 1G
2. Pin Connections
Terminal NO 1 2 3 4 5 G 7 8 9 10 11 12 13 14 15 16 17 18
ELECTRODE F1 F1 F1 NP 106 96 8G 7G 66 56 AG 36 2G 16 NC NC P(S12) P(S11)

Terminal N0 19 20 21 22 23 24 25 26 27 28 29 30 31 32
ELECTRODE P(S10) P(S9) P(SB) P(S7) P(56) P(S$) P(S4) P(53) P(SZ) P(S1) NP F2 F2 F2

Notes F: Filament NP: No Pin
G: GrId NC: No Connection
P: Anode

3.Anode Connection Table

106 9G 86 7G BG SG AG 3G 26 1G
51 6 - - - - - - - - -
$2 5 CONTINUE TRACK - STEP - EACH : REMAIN -
53 4 PROGRAM a a a a a a a a
54 3 RANDOM b b b b b b b b
55 2 DELPRGM c C c C c c c c
56 1 d d d d d d d d
57 E (5) 9333": e e e e e e
58 1:1 (5) P f f f f f f f f
59 '23 (4) E: (P) 9 g 9 9 9 g 9
S10 12:: (3) [> E REPEAT PRGM EDIT SIDE-A
511 "-l (2) E DI] E 1 INTRO E SIDE-B
S12 5:1(1) E - E DIsc E EDIT E -

1-32 (No.20380)