Sharp 27SC26BQ, Service Manual

Page: 15 / 42

15
Vertical-Size and Linearity Adjustments
1. Receive a good local channel.
(SCREEN FORMAT 4:3)
2. Enter the service mode and select the service
adjustment "D04" for V-size.
3. Adjust the "D04" bus data to get the proper V-size.
4. For V-linearity adjustment, select data bus "D07" and
adjust to get the proper vertical linearity.
(SCREEN FORMAT 16:9)
5. Input data of "D14" to minus 26 steps from "D04"
data. (V-SIZE)
6. Input data of "D17" to minus 3 steps from "D07" data.
(V-LIN)
Note: Aging for 10 min before adjustment. After the
adjustment of V-center and V-size, re-
adjustment for this V-line.
Vertical Phase Adjustment
(SCREEN FORMAT 4:3)
1. Enter the service mode and input data of "00" on
"D01".
2. Adjust "D03" data value so that picture is centered.
(SCREEN FORMAT 16:9)
3. Input data of "00" on "D11".
4. Input data of "D13" is additional 10 steps from data
"D03".
Horizontal Position Adjustment
1. Receive a good local channel.
(SCREEN FORMAT 4:3)
2. Enter the service mode and select the service
adjustment "D02".
3. Adjust "D02" data value so that picture is centered.
(SCREEN FORMAT 16:9)
4. Input data of "D12" same as "D02" data.
Horizontal-Size Adjustment
1. Receive a good local channel.
(SCREEN FORMAT 4:3)
2. Enter the service mode and select the service
adjustment "D05" for H-size.
3. Adjust the "D05" bus data to get the proper H-size.
(SCREEN FORMAT 16:9)
4. Input data of "D15" is additional 1 step from data
"D05".
EW-Parabola
1. Receive a good local channel.
(SCREEN FORMAT 4:3)
2. Enter the service mode and select the service
adjustment "D08" for EW parabola.
3. Adjust the "D08" bus data to get the proper vertical
straight line for both left and right side.
(SCREEN FORMAT 16:9)
4. Input data of "D18" to minus 10 steps from "D08"
data.
EW-Corner
1. Receive a good local channel.
(SCREEN FORMAT 4:3)
2. Enter the service mode and select the service
adjustment "D10" for EW-Corner.
3. Adjust the "D10" bus data to get the best position
display.
(SCREEN FORMAT 16:9)
4. Input data of "D20" is plus 2 steps of "D10" data.
Ë
MTS ADJUSTMENT
MTS Level Adjustment
1. Set the sound volume above 1.
Monoral signal: 400Hz, 100% modulation
2. Vary the "M01" bus data until the voltage to pin (39)
of IC3001 to become the value as stated below.
SETTING VOLTAGE
ADJ spec : 490±10mVrms
CHK spec: 490±20mVrms
Separation Adjustment
1. Input "SIGNAL 1" and vary the "M04" bus data to get
the minimun AC voltage to pin (39) of IC3001.
2. Input "SIGNAL 2" and vary the "M05" bus data to get
the minimun AC voltage to pin (39) of IC3001.
SIGNAL 1: 300Hz, 30% modulation, Lch only, NR-ON
SIGNAL 2: 3kHz, 30% modulation, Lch only, NR-ON
Note: SIGNAL 1 Adj. for widebando
SIGNAL 2 Adj. for spectral
Check the output of the speaker at the maximum
volume as stated below.
Confirmation spec:
ADJ spec: above 25 dB
CHK spec: above 20 dB
27SC26BQ