No. 51787
C-20210
AV-20220
AV-20221
10
SERVICE ADJUSTMENTS
ADJUSTMENT PREPARATION:
1. You can make the necessary adjustments for this unit with
either the Remote Control Unit or With the adjustment
tools and parts as given below.
2. Adjustment with the Remote Control Unit is made on the
basis of the initial setting values, however, the new setting
values which set the screen to its optimum condition may
differ from the initial settings.
3. Make sure that AC power is turned on correctly.
4. Turn on the power for set and test equipment before use, and
start the adjustment procedures after waiting at least 30
minutes.
5. Unless otherwise specified, prepare the most suitable reception
or input signal for adjustment.
6. Never touch any adjustment parts which are not specified in the
list for this adjustment - variable resistors, transformers,
condensers, etc.
7. Presetting before adjustment.
Unless otherwise specified in the adjustment instructions,
preset the following functions with the remote control unit:
VIDEO STATUS
STANDARD
BASS, TREBLE,
BALANCE
CENTER
(AV-20220/AV-20221)
TINT/COLOR
PICTURE/BRIGHT
DETAIL
CENTER
ADJUSTMENT EQUIPMENT
1. DC voltmeter (or digital voltmeter)
2. Oscilloscope
3. Signal generator (Pattern generator)
[
NTSC
]
4. Remote control unit
5. TV audio multiplex signal generator.
6. Frequency counter
ADJUSTMENT ITEMS
Adjustment items
Adjustment items
Adjustment items
(AV-20220/21)
B1 POWER
SUPPLY
WHITE BALANCE
(Low Light)
MTS INPUT
LEVEL check
IF VCO
WHITE BALANCE
(High Light)
MTS STEREO
VCO
RF. AGC
SUB BRIGHT
MTS SAP VCO
FOCUS
SUB CONTRAST
MTS FILTER check
V. SIZE
SUB COLOR
MTS
SEPARATION
H. POSITION
SUB TINT
MAIN PWB
CRT SOCKET PWB
(Within MAIN PWB ASS'Y)
U
T
TP-E
POW ER
(SOLDER SIDE)
TOP
FRONT
IC421
Q522
HV
UPPER : FOCUS
LOW ER : SCREEN
U
T
TUNER
IC201
IC702
IC701
MENU
CH-
CH+
VOL-
VOL+
F901
IC921
S
MONO
T522
T131 CW
3
1
CW
R926
F902
TP-91
(B1)
TP-E
( )
PW
DEG.
CRT EARTH
(BRAIDED ASS'Y)
E1
TP-R
AV IN OUT
ON
TIMER
REMOCON
RECEIVER
S
STEREO
MPX
TP-12B
(AV-20220/21)
(C-20210)
(AV-20220/21)
AV-20220
AV-20221
C-20210 :AV IN ONLY(MONO)
(
(
:AV IN OUT (STEREO)
ADJUSTMENT LOCATIONS
Summary of Contents for AV-20220/S
Page 53: ...No 51787 AV 20220 AV 20221 42 ...
Page 54: ...No 51787 AV 20220 AV 20221 43 ...