JVC AV28R100EKS, Service Manual

Page: 65 / 93

AV-29RF6
1
No.51754
AV-29RF6
2-2
Jun. 1998
1
n NOTE ON USING CIRCUIT DIAGRAMS
1. SAFETY
The components identified by the ! ! ! ! symbol and shading are
critical for safety. For continued safety replace safety critical
components only with manufactures recommended parts.
2.SPECIFIED VOLTAGE AND WAVEFORM VALUES
The voltage and waveform values have been measured under the
following conditions.
(1)Input signal : Colour bar signal
(2)Setting positions of
each knob/button and
variable resistor
(3)Internal resistance of tester :DC 20k ¶ /V
(4)Oscilloscope sweeping time :H Ë 20µS/div
:V Ë 5mS/div
:Others Ë Sweeping time is
specified
(5)Voltage values :All DC voltage values
– Since the voltage values of signal circuit vary to some extent
according to adjustments, use them as reference values.
3.INDICATION OF PARTS SYMBOL [EXAMPLE]
œ
In the PW board :R1209 ¨ R209
4.INDICATIONS ON THE CIRCUIT DIAGRAM
(1)Resistors
œ Resistance value
No unit :[ ¶ ]
K :[K ¶ ]
M :[M ¶ ]
œ Rated allowable power
No indication
:1/10[W]
Others :As specified
œ Type
No indication :Carbon resistor
OMR :Oxide metal film resistor
MFR :Metal film resistor
MPR :Metal plate resistor
UNFR :Uninflammable resistor
FR :Fusible resistor
*Composition resistor 1/2 [W] is specified as 1/2S or Comp.
(2)Capacitors
œ Capacitance value
1 or higher :[pF]
less than 1 :[µF]
œ Withstand voltage
No indication
:DC50[V]
AC indicated :AC withstand voltage [V]
Others :DC withstand voltage [V]
*Electrolytic Capacitors
47/50[Example]:Capacitance value [ µ F]/withstand voltage[V]
œ Type
No indication :Ceramic capacitor
MY :Mylar capacitor
MM :Metalized mylar capacitor
PP :Polypropylene capacitor
MPP :Metalized polypropylene capacitor
MF :Metalized film capacitor
TF :Thin film capacitor
BP :Bipolar electrolytic capacitor
TAN :Tantalum capacitor
(3)Coils
No unit :[ µ H]
Others :As specified
(4)Power Supply
:B1
:12V
:9V
:5V
*Respective voltage values are indicated
(5)Test point
:Test point
:Only test point display
(6)Connecting method
:Connector
:Wrapping or soldering
:Receptacle
(7)Ground symbol
#
:LIVE side ground
"
:ISOLATED(NEUTRAL) side ground
:EARTH ground
:DIGITAL ground
5.NOTE FOR REPAIRING SERVICE
This model’s power circuit is partly different in the GND. The
difference of the GND is shown by the LIVE : (
# ) side GND and the
ISOLATED(NEUTRAL) : ( " ) side GND. Therefore, care must be
taken for the following points.
(1)Do not touch the LIVE side GND or the LIVE side GND and the
ISOLATED(NEUTRAL) side GND simultaneously. If the above
caution is not respected, an electric shock may be caused.
Therefore, make sure that the power cord is surely removed from
the receptacle when, for example, the chassis is pulled out.
(2)Do not short between the LIVE side GND and
ISOLATED(NEUTRAL) side GND or never measure with a
measuring apparatus ( oscilloscope, etc.) the LIVE side GND and
ISOLATED(NEUTRAL) side GND at the same time. If the above
precaution is not respected , a fuse or any parts will be broken.
ž Since the circuit diagram is a standard one, the circuit and
circuit constants may be subject to change for improvement
without any notice.
:Original setting position
when shipped
AV-29RF6
(C SC)
STANDARD CIRCUIT DIAGRAM
Jul. 2000 No.51754
CONTENTS
SEMICONDUCTOR SHAPES
2-2
BLOCK DIAGRAM
2-3
CIRCUIT DIAGRAMS
MAIN PWB CIRCUIT DIAGRAM
2-5
POWER & DEF PWB CIRCUIT DIAGRAM 2-9
CRT SOCKET PWB CIRCUIT DIAGRAM 2-11
FRONT CONTROL PWB CIRCUIT DIAGRAM
2-13
AV SEL. PWB CIRCUIT DIAGRAM 2-15
PATTERN DIAGRAMS
MAIN PWB PATTERN [ SJK-1025A-F2 ] 2-17
POWER & DEF PWB PATTERN
[ SJK-2024A-F2 ] 2-19
CRT SOCKET PWB PATTERN
[ SJK-3011A-F2 ] 2-21
FRONT CONTROL PWB PATTERN [ SJK-8011A-F2 ] 2-23
AV SEL. PWB PATTERN [ SJK0S003A-F2 ] 2-25
SEMICONDUCTOR SHAPES
TRANSISTOR
BOTTOM VIEW FRONT VIEW TOP VIEW
CHIP TR
IC
BOTTOM VIEW FRONT VIEW TOP VIEW
CHIP IC
TOP VIEW
1 N
N
1
OUT
E
IN
IN OUT E
1 N
N
1
N
N
N
1
N
E
C
B
E C B
C
B E
B C E
(G)(D)(S)
E C B
E C B