STANDARD CIRCUIT DIAGRAM
AV-21D43
/BK
AV-20N43
/BK
AV-14F43
/BK
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)Oscillosco pe swe eping time
:H 
20µS/div
:V 
5mS/div
:Others
Sweeping time is 
specified
(5)Voltage values
:All DC voltage values
Sin ce th e vo l tage val ue s of si gn a l cir cui t va ry to some ex ten t  
according to adjustments, use them as reference values.
3.INDICATION OF PARTS SYMBOL [EXAMPLE]
In the PW board
:R1209
R209
4.IND ICATIONS ON THE CIRCUIT DIAGRAM
(1)Resistors
Resistance value 
No unit :[
]
K
:[K
]
M
Rated allowable power 
No indication :1/ 16 [W] 
Others :As specified
Type 
No indic ation
:Carbon resistor
OMR
:Oxide metal film resistor
MFR
:Metal film resisto r
MPR
:Metal plate resistor
UNFR
:Uninflammable resi stor
FR
:Fusible resistor
C omposition r esistor 1/2 [W] is specified as 1/2S or Comp.
(2)Capacitors
: Original setting position 
 when shipped
5.NOT E FOR REPAIR ING S ERVI CE
This model's power circuit is partly di fferent 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 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.
Since the circuit diagram is a standard one, the ci rcuit an d 
circuit constants may be subject to change for improvement 
without any notice.
NOTE 
Due improvement in performance, some part numbers show 
in the circuit diagram may not agree with those i ndicated in 
the part list. 
When ordering parts, plea se use the numbers t hat appear 
in the Parts List .
Type
MM
:M etal ized mylar capa c i tor
PP
:Polypropylene capacitor
MPP
:Metalized polypropylene capacitor
MF
:Metalized film capacitor
TF
:Thin film capacitor
BP
:Bipolar electrolytic capacitor
TAN
:Tant alum capacit or
(3)Coils
No unit
:[
µ
H]
Others
:As specified
(4)Power Supply
:B1
:9V
:5V
Respective voltage values are indicated
(5)Test point
:T est point
:Only test point display
(6) Connecting method
:Connector
:Wrapping or sold eri ng
:Receptacle
 (7)Ground symbol
:LIVE side ground 
:ISOLATED(NEU TRAL) side ground 
:EARTH ground 
:DIGITAL ground
:[M ]
Capacitance value 
1 or higher :[pF]
less than 1
:[µF] 
Withstand voltage 
No indication  :DC50[V]
Others :DC withstand voltage [V] 
AC indicated 
:AC withstand voltage [V] 
Electrolytic Capacitors
47/50[Example]:Capacitance value [µF]/withstand voltage[V]
No indication
:Ceramic capacitor
:B2 (12V)
Aug. 2002 No. 520362-16