JVC TM-A210G/C Service Manual page 21

4.7 ADJUSTMENT PROCEDURE
4.7.1 CHECK ITEM
Measuring
Item
instrument
HIGH VOLTAGE HV voltmeter CRT anode
4.7.2 B1 VOLTAGE
Measuring
Item
instrument
B1 VOLTAGE DC voltmeter TP-91(B1)
CUTOFF ADJUSTMENT MODE
RGB SERV
CHROMA CONTRAST
PHASE BRIGHT
Display single horizontal line switch
Test point Adjustment part
SCREEN VR
[in FBT]
Test point Adjustment part
B1 ADJ VR (VR1901)
[S1:1 pin] [MAIN PWB]
TP-E(GND)
[S1:5 pin] SCREEN VR
[MAIN PWB] [in FBT]
R CUTOFF :
EXIT
VOLUME / SELECT MENU
Adjustment mode exit
Description
(1) Select WHITE BALANCE
[CONTRAST/BRIGHT] button (< W/B >) from <
BLOCK SELECT > SERVICE MENU screen.
(2) Select CUTOFF adjustment mode with [CHROMA/
PHASE] button (< CUTO >).
(3) Display the single horizontal line with [CONTRAST/
BRIGHT] button (< SERV >).
(4) Adjust the SCREEN VR to disappear the single
horizontal line.
(5) Connect the HV voltmeter to the CRT anode and
check it as 27.0kV±1.3kV.
(6) Readjust the SCREEN VR to appear the horizontal
line faintly, and cancel the single horizontal line with
the [CONTRAST/BRIGHT] button (< SERV >).
(7) Exit the WHITE BALANCE BLOCK with [MENU]
button (< EXIT >).
Description
(1) Select WHITE BALANCE
[CONTRAST/BRIGHT] button (< W/B >) from <
BLOCK SELECT > SERVICE MENU screen.
(2) Select CUTOFF adjustment mode with [CHROMA/
PHASE] button (< CUTO >).
(3) Display the single horizontal line with [CONTRAST/
BRIGHT] button (< SERV >).
(4) Adjust the SCREEN VR to disappear the single
horizontal line.
(5) Check the B1 voltage as 115.0V±2V.
(6) If B1 voltage is out of range, adjust it with B1 ADJ
VR.
BLOCK with
BLOCK with
(No.52119)1-21