Evr Adjustment - JVC TK-C675BU Service Manual

Measuring
No. Item instrument &
Input signals

2.10 EVR ADJUSTMENT

• After replacing the CCD image sensor or EEPROM, execute "Restore" in the EEPROM menu to write the initial value data
"TKC675_N.DAT"(U Ver.) or "TKC675_P.DAT"(E Ver.) in EEPROM before proceeding to the adjustment.
• Set the lens iris using the remote control software (refer to the instruction manual of the remote control software).
• To adjust items which require the adjustment software, select the required menu commands from the CAM. ADJ. menus using
the [Alt] key or mouse.
1 PLL control • Oscilloscope
voltage (H-rate 10:1)
adjustment • It is not neces
sary to use the
infinity adjust
ment lens for
this adjustment.
2 Gain • Gray scale chart
adjustment (just scan)
• Oscilloscope
(H-rate 10:1)
3 OFD • It is not neces-
adjustment sary to use the
infinity adjust-
ment lens for
this adjustment.
• TV monitor
screen.
• Incandescent
lamp.
Smear
Monitor
2-5
Measuring point (
Adjustment parts (
Mode
Adjustment level (
TP1 (A-2B) [IF]
2Bh (PLL voltage)
2.75V DC
TP201 (B-1C) [PR]
LENS IRIS
0.7Vp-p
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
VIDEO output
36h (Y gain)
<U Ver. >
0.714Vp-p [100 IRE]
<E Ver.>
0.7Vp-p
Shutter TV monitor screen
<U Ver.> 26h (V. sub)
1/100 Minimum blooming
<E Ver.>
1/60
Incandescent lamp
Blooming
Monitor
)
)
Adjustment procedure
)
1) Set S1-6 on the MD board to ON.
2) Adjust the PLL voltage data so that the volt-
age at TP1 [IF] is 2.75V DC.
3) Set S1-6 on the MD board to OFF.
1) Set lens iris so that the white level in the
center of the gray scale chart at TP201 [PR] is
0.7Vp-p.
2) Adjust the Y gain data so that the white level
in the center of the gray scale chart at VIDEO
output is 0.714 Vp-p [100 IRE] (U Ver.) or 0.7
Vp-p (E Ver.).
1) Set the shutter to "1/100" (U Ver.) or 1/60(E
Ver.).
2) Shoot an incandescent lamp and set the iris
to a position at which blooming becomes
most clear.
3) While observing the monitor screen, adjust
the V. sub data so that blooming disappears.
4) Set the shutter to "NORMAL".