STANDARD CIRCUIT DIAGRAM
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
foll owing 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
20µS/div
:V
5mS/div
:Others
Sweeping time is
specified
(5)Voltage values
:All DC voltage values
Sin ce the voltage val ues of signa l circuit vary to some exten t
according to adjustments, use them as reference values.
3.INDICATION OF PARTS SYMBOL [EXAMPLE]
In the PW board
:R1209
R209
4.INDICATIONS ON THE CIRCUIT DIAGRAM
(1)Resistors
Resistance value
No unit :[
]
K
:[K
]
M
Rated allowable power
No indication :1/ 16 [ W]
Others :As specified
Ty pe
No indication
:Carbon resistor
OM R
:Oxi de metal film resistor
MFR
:Met al film resistor
MPR
:Metal plate resistor
UNFR
:Uninflammable resistor
FR
:Fusible resistor
Compositi on resistor 1/2 [W] is spec ified a s 1/2S or Comp.
(2)Capacitors
: Original setting position
when shipped
5.NOTE FOR REPAIRI NG SERV ICE
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 e xample, 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 measure
with a measuring apparatus ( oscilloscope, etc.) the LIVE side GND
and ISOLATED(NEUTRAL) side GND at t he same time.
If the above precaution is not respected , a fuse or any parts will be broken.
Since the circuit diagram is a standard one, the circuit and
circuit constants may be subject to change for improvement
without any notice.
NOTE
Due improvement in performance, some part numbers show
in th e circui t diag ram may not agree with th ose indicate d in
the part list.
When ordering parts, please use the numbers that appear
in the Parts List.
Ty pe
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) Coi ls
No unit
:[
µ
H]
Others
:As specified
(4)Power Supply
:B1
:9V
:5V
Respective voltage values are indicated
(5)Test point
:Test p oint
:Only test point display
(6)Conn ecti ng me thod
:Connector
:Wrapping or soldering
:Receptacle
(7)Ground symbol
:LIVE side ground
:ISOLATED(NEUTRAL) side ground
:EARTH ground
:DIGITAL ground
:[M ]
Capacitance value
1 or higher :[pF]
less than 1
:[µF]
Withstand voltage
No indication :DC5 0[V]
Others :DC withstand voltage [V]
AC indicated
:AC withstand voltage [V]
Electrolytic Capacitors
47/50[Example]:Capac itance value [µF]/withstand voltage[V]
No indication
:Ceramic capacitor
:B2 (12V)
AV28R25EKS / AV28R250EKS
MAIN PWB CIRCU IT DIAGRAM
POWER & DEF PWB CIRCUIT DIAGRAM
AV SW PWB CIRCUIT DIAG RAM
DOLBY PWB CIRCUIT DIAGRAM
CRT SOCKET PWB CIRCUIT DIAGRAM
FRONT CONTROL PWB CIRCUIT DIAGRAM
SIDE CONTROL PWB CIRCUIT DIAGRAM
AV SW PWB PATTERN
DOLBY PWB PATTERN
CRT SOCKET PWB PATTERN
FRONT CONTROL PWB PATTERN
SIDE CONTROL PWB PATTERN
Mar. 2002 No. 51941