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C-20210
AV-20220
AV-20221
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.
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 LOCATIONS
POW ER
FRONT
ON
TIMER
PW
F901
DEG.
R926
F902
TP-91
(B1)
IC921
TP-E
(
)
C-20210
:AV IN ONLY(MONO)
(
AV-20220
:AV IN OUT (STEREO)
AV-20221
10
VOL-
CH+
CH-
REMOCON
VOL+
MENU
RECEIVER
IC701
TP-12B
T131 CW
CW
IC201
3
1
T
MPX
(AV-20220/21)
AV IN OUT
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
BASS, TREBLE,
BALANCE
TINT/COLOR
PICTURE/BRIGHT
DETAIL
ADJUSTMENT ITEMS
Adjustment items
B1 POWER
SUPPLY
IF VCO
RF. AGC
FOCUS
V. SIZE
H. POSITION
IC702
STEREO
S
(AV-20220/21)
MAIN PWB
MONO
S
(C-20210)
U
HV
TUNER
T522
UPPER : FOCUS
LOW ER : SCREEN
No. 51787
STANDARD
CENTER (AV-20220/AV-20221)
CENTER
Adjustment items
Adjustment items
(AV-20220/21)
WHITE BALANCE
MTS INPUT
LEVEL check
(Low Light)
WHITE BALANCE
MTS STEREO
VCO
(High Light)
SUB BRIGHT
MTS SAP VCO
SUB CONTRAST
MTS FILTER check
MTS
SUB COLOR
SEPARATION
SUB TINT
IC421
CRT SOCKET PWB
(Within MAIN PWB ASS'Y)
TP-R
Q522
T
TP-E
(SOLDER SIDE)
TOP
U
E1
CRT EARTH
(BRAIDED ASS'Y)
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