Circuit Adjustments - Sony KP-48V75 Service Manual

SECTION 5

CIRCUIT ADJUSTMENTS

5-1. RF AGC 5-4. SUB-HUE AND SUB-COLOR ADJUSTMENT
1. Input the 75% white color bars pattern signal. (SHUE, SCOL)
2. Adjust AGC VR of TU1101 so that snow noise, and
1. Receive the 75% white color bars pattern signal.
crossmodulation disapper from the picture.
2. PICTURE
3. Verify picture quality on each channel.
COLOR
BRIGHTNESS : center
5-2. BAR DISPLAY ADJUSTMENT (DISP)
TRINITONE
1. Receive the cross-hatch signal. 3. Set to service mode.
4. Connect an oscilloscope between pin 7 of CN004 (A Board)
2. Set to Service mode.
3. Select " DISP ", and adjust so that the blank spaces on the connecter and ground.
both sides of picture bar become equal. 5. Select " SHUE " and " SCOL ", and adjust them to have
4. Write the data into memory. VB1 = VB4 and VB2 = VB3 in the wave form levels.
MUTING n ENTER 6. Raise " SCOL " data 0 steps higher.
7. Write the data into memory.
MUTING n ENTER
A A=B B
Fig. 5-1
5-3. SUB CONTRAST ADJUSTMENT (SCON) 5-5. DVD INPUT SUB HUE, SUB COLOR ADJUSTMENT
1. Receive the 75% white color bars pattern signal. (UVSH, UVSC)
2. PICTURE : maximum 1. Select video 4 input.
COLOR : minimum
2. PICTURE
BRIGHTNESS : center
COLOR
TRINITONE : medium
BRIGHTNESS : center
RON---1 GON---0 BON---0 TRINITONE
3. Set to service mode.
3. Set to service mode.
4. Connect an oscilloscope between pin 6 of CN004 (A Board)
4. Connect an oscilloscope between pin 5 of CN303 (A Board)
and ground.
and ground.
5. Select " SCON ", and adjust so that the wave form level is 5. Select " UVSH " and " UVSC " , adjust them to have VB1 =
1.75±0.05Vp-p.
VB4 and VB2 = VB3 in the wave form levels.
6. Write the data into memory.
6. Write the data into memory.
MUTING n ENTER
MUTING n ENTER
White
±
1.75 0.05Vp-p
Black
Fig. 5-2
– 49 –
KP-48V75/53V75/61V75 KP-48V75/53V75/61V75
RM-Y903 RM-Y903 RM-Y903 RM-Y903
RM-Y903 RM-Y903
5-6. P IN P SUB CONTRAST ADJUSTMENT
(MSCN, SCON)
1. Receive the 75% white color bars pattern signal.
: maximum
2. PICTURE : maximum
: center
COLOR : minimum
BRIGHTNESS : center
: medium
TRINITONE : medium
3. Set to P & P ( ) mode, and to service mode.
4. Connect an oscilloscope between pin 4 of CN305 (A Board)
and ground.
5. Open pin 7 of CN301 (A Board).
6. Select " MSCN " and " SCON ", adjust them to have PY1 =
PY2 ( 470 ± 20mV) in the wave form levels.
7. Write the data into memory.
MUTING n ENTER
PY2
VB1 VB2 VB3 VB4
PY1 = PY2 = 470 ± 20mV.
Fig. 5-3
Fig. 5-5
: maximum
: center
: medium
VB1 VB2 VB3 VB4
Fig. 5-4
5-7. P IN P SUB HUE, SUB COLOR ADJUSTMENT
(MSHU, SSHU, MSCL, SSCL)
1. Receive the 75% white color bars pattern signal.
2. PICTURE : maximum
COLOR : center
TRINITONE : medium
3. Set to P & P ( ) mode, and to service mode.
4. Connect an oscilloscope between pin 5 of CN305 (A Board)
and ground.
5. Select " MSHU " , " SSHU " , " MSCL " and " SSCL", and
make adjustment sub hue and sub color so that the wave form
shows X1 = Y1 and X2 = Y2.
6. Raise " UVSC " data 8 steps higher.
7. Write the data into memory.
MUTING n ENTER
X2 X1
PY1
(FROM PEDESTAL
TO PEEK) PY2 Y2 Y1 PY1
X1 = Y1
X2 = Y2
PY1 = PY2 = 750 ± 30mV.
Fig. 5-6
– 50 –
MEMO
– 51 –
KP-48V75/53V75/61V75
RM-Y903
RM-Y903 RM-Y903