Jvc XLV 152 BK Service Manual

Page 2

XL-V251TN /XL-V2523K

XL-V1 51 TN I XL-V1 523K

- Safety 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 authorised in writing by the manufacturer. Replacement parts must
be identical to those used in the original circuits.

. Any unauthorised design alterations'or additions will void the manufacturer's guarantee;

furthermore the manufacturer cannot accept responsibility for personal injury or property
damage resulting therefrom.

.'Essential safety critical components are identified by (A) on the Parts List and by shading

on the schematics ,and must never be replaced by parts other than those listed in the
manual. Please note however that many electrical and mechanical parts in the product have
special safety related characteristics. These characteristics are often not evident from visual
inspection. Parts other than specified by the manufacturer may not have the same safety
characteristics as the recommended replacement parts shown in the Parts List of the service
manual and 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.

Warning

. Service should be performed by qualified personnel only.
.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. 20301 U)

c.

Page 31

XL-V151TN/XL-V1SZBK
XL-V2 51 TN I XL-VZSZBK

Front Section

ls the pln32 of lCZOl + 5V?
Is the in19 of lC201 -32V?
Is the ilament of FLZOl
biased as shown below?

V N0 Check the connections
0 between the power supply

a = -28V circuit and the front PCB.

FL201
4V RMS ls the relationship
between output terminal
YES of ICZOZ and 4- 5V line as
YES shown in the figure? NO
Does panof FL become - -
extreme] bright and display + 5v + 5" " Check reset circuit.
abnorma lyl _____ + W
YES iczoz + 5v
N0 out ___I::- + W
Does the following waveform

appear at Pin5~24ofFL2017

YES NO .
fi '->l ls the FL display normal? |-> Defective F'-
-2Bv - * YES
NO ls operation of the 0 Check Ic 20] iswitches
buttons normal? and wmng,
Defective lC201 l YES
OK
Loading section -
} is the pin 1 of lC602 +1ovz no
ls the pin 5 of lC602 - 10V? Check the power
Is the pin 40f IC603 - low supply ctrcwt.
Is the pin 8 of ICEOS +10V?
VES
Open the tray and close
it.
YES
NO Is the voltage Is the voltage - 6.6V
ls operation normal? :anéoglmlgltfilzvhgy at NO at pin 1 oflCSOH YES
opening and + 6v when when opening and Check ICGOZ
closing? +6.6V when closmg'l
YES
NO
YES
0K Are the voltages of each
terminal right?
Check the loading At OPEN mode
motor and the pin29 (IC201)= 5V
connections with the pin23(lC201)=0V
loading motorl At CLOSE mode
pin29 (1:201)=ov
: pin28 (IC201) = 5v

NO YES

Check the wiring . ~

frommemnasm :rsslslamd
J601 to the pin 24. the f o t PCB
25 of lCZOl and " _
OPEN ICLOSE switch.

(No.20301) 1-31