Sharp 27F830 Service Manual download pdf (Page 12)

27F830

P-IN-P ADJUSTMENT

MTS ADJUSTMENT

MTS Level Adjustment

1. Set the sound volume above 1.

Monoral signal: 400Hz, 100% modulation

2. Confirm "EX4" data is "5Ah".

3. Vary the "M01" bus data until the voltage to pin (39)

of IC3001 to become the value as stated below.

4. Set the sound volume above 1.

5. Vary the "M06" bus data until the voltage to pin (39)

of IC3001 to becomes the value as stated below.

SETTING VOLTAGE

ADJ spec : 490±10mVrms

CHK spec: 490±20mVrms

MTS VCO Adjustment

1. Keep the unit in no-signal state.

2. Connect the frequency counter to pin (39) of IC3001.

3. Connect a capacitor (100µF, 50V) in between

positive(+) side of C3005 and ground.

4. Enter the service mode and select the service

adjustment "M02"

5. Adjust the data so that the frequency counter reads

62.94 ±0.75kHz.

Filter Adjustment

1. Feed the following stereo pilot signal to pin (14) of

IC3001 at C3005 open.

Stereo pilot signal: 9.4kHz, 600mVrms.

2. Enter the service mode and select the service

adjustment "M03".

3. Adjust the data until "OK" appears in position on the

screen. Make sure the "OK" is displayed almost at

the center of the data range.

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

3. Input "SIGNAL 1" and vary the "M07" bus data to get

the minimun AC voltage to pin (39) of IC3001.

4. Input "SIGNAL 2" and very the "M08" bus data to get

the minimun AC voltage to pin (39) of IC3001.

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

P-IN-P Y-LEVEL Adjustment

1. Receive a good local channel.

2. Enter the service mode and select the service

adjustment "P01".

3. Adjust "P01" data value to obtain normal contrast

level.

P-IN-P TINT Adjustment

1. Receive a good local channel.

2. Enter the service mode and select the service

adjustment "P02".

3. Adjust data value to "29h".

P-IN-P COLOR Adjustment

1. Receive a good local channel.

2. Make sure the customer color control is set to center

position.

3. Enter the service mode and select the service

adjustment "P03".

4. Adjust "P03" data value to obtain normal color level.

P-IN-P Y-OFF SET Adjustment

1. Receive a good local channel.

2. Enter the service mode and select the service

adjustment "P04".

3. Adjust data value to "09h".

P-IN-P H-POSITION Adjustment

1. Receive a good local channel.

2. Enter the service mode and select the service

adjustment "P05".

3. Adjust data value to "0Ah".

P-IN-P BURST GATE PULSE (for MAIN)

1. Receive a good local channel.

2. Enter the service mode and select the service

adjustment "P06".

3. Adjust data value to "00h".

P-IN-P FREERUN

1. Receive a good local channel.

2. Enter the service mode and select the service

adjustment "P07".

3. Adjust data value to "0Bh".

P-IN-P TINT INPUT Adjustment

1. Receive an AV/Component input signal.

2. Enter the service mode and select the service

adjustment "P08".

3. Adjust data value to "24h".

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Sharp 27F830 Service Manual Page 12

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