No. 52025

A

V-20N3

A

V-20NMG3

A

V-20NMG3B

20
ADJUSTMENTS

B1 POWER SUPPLY

Item Measuring
instrument Test point Adjustment part Description
Check o f
B1 Power
Supply
Signal
generator
DC Vol t-
meter
TP-91 ( B1)
TP-E (#
##
#)
1. Input a whol e black sig nal.
2. Con nect a DC vo ltme ter t o TP- 91( B1) and TP- E (#).
3. Make sur e that the v olt age is DC1 16.5±2. 0 V.

FOCUS ADJUSTME NT

Item Measuring
instrument Test point Adjustment part Description
Adju s t men t
of FOCUS
Signal
generator
FOCUS VR
[In HVT]
1. Input a cross-hatch signal.
2. While w atching t he screen, adjus t the FOCUS VR to mak e the
vertic al and hori zonta l l ines as f ine and sha rp as possib le.
3. Make sur e that when the sc ree n is d arken ed, t he lin es re mai n in
good focu s.

IF CIRCUIT ADJUS TMENT

Item Measuring
instrument Test point Adjustment part Description
●Please use signal generator which is correct proof about the
sending freq uenc y.
Adju s t men t
of VCO
(
CW
)
Signal
generator
Remote
control unit
1. VCO
1. Input th e PAL f ull colo ur b ar (210 .25MH z) s ignal .
2. Enter the SER VICE MENU.
3. Select 1 .IF from t he SERV ICE MENU.
4. Pres s 1 ke y an d sel ect 1. VC O.
5. Select VCO ADJUST with MENU ▲/▼ key.
6. Pres s MENU -/+ key until the co lour of the character s TOO
HIGH chan ges blue t o yellow . Then gr adually pr ess the MEN U
-/+ key unti l the T OO LOW ch anges yel low. At this tim e, conf irm
that t he val ue of VCO ADJUST is n ear +00 .
7. Select AFT ADJUST with MENU ▲/▼ key.
8. Press MENU -/+ key until the characters JUST REFERENCE
changes blue to yell ow.
9. Pres s the DISPLA Y key three times to return to normal screen.
VCO (CW)
***.**
MHz
TOO HIGH
ABOVE REFEREN CE
JUST REFERE NCE
BELOW REFERE N CE
TOO LOW
AFT ADJUST
***(**)
***(**)***(**)
***(**)
VCO ADJUST
***(**)
***(**)***(**)
***(**)
FINE
DISP : EXIT
YELLOW
D
o
n
ot
adjust
ADJUSTMENT AT THIS POINT IS USELESS
ABOVE REFERENCE
TOO HIGH
BELOW RE F E RE NC E
JUS
T REFEREN
C
E
TOO LOW
ADJUSTMENT POINT