System Control Adjustment; 27Mhz Free Run (Mb-78 Board); Video System Adjustment; Video Level Adjustment (Au-199, Mb-78 Boards) - Sony DVP-M35 Service Manual

6-2. SYSTEM CONTROL ADJUSTMENT

1. 27MHz Free Run (MB-78 board)

<Purpose>
27MHz is the reference clock for the MPEG system.
Mode E-E
Test point TP201 (27MHz)
Instrument Oscilloscope, Frequency counter
Adjusting element CT201
Specification 27000000 ±100Hz
Adjusting method:
1) Confirm that the waveform at TP201 is normal.
2) Adjust CT201 to attain 27000000 ± 100 Hz.
Fig. 6-1

6-3. VIDEO SYSTEM ADJUSTMENT

1. Video Level Adjustment
(AU-199, MB-78 boards)
<Purpose>
This adjustment is made to satisfy the NTSC Standard, and if not
adjusted correctly, the brightness will be too large or small.
Mode
Signal
Test point
Instrument
Adjusting element
Specification
Adjusting method:
1) In the test mode initial menu "0" Syscon Diagnosis, set so that
CXD1914 color bars are generated.
2) Adjust the RV251 to attain 1 ± 0.02 Vp-p.

2. S-terminal Output Check (AU-199 board)

<Purpose>
Check S-terminal video output. If it is incorrect, pictures will not
be displayed correctly in spite of connection to the TV with an S-
terminal cable.
Mode
Signal
Test point
Instrument
Specification
Checking method:
1) In the test mode initial menu "0" Syscon Diagnosis, set so that
CXD1914 color bars are generated.
2) Confirm that the S-Y level is 1 ± 0.05 Vp-p.
6-2
CXD1914 (Serial) check in test mode
menu "0" Syscon Diagnosis (8-2)
Color bars
J354 LINE OUT VIDEO
(Terminating 75Ω)
Oscilloscope
RV251
1 ± 0.02 Vp-p
1 ± 0.02 Vp-p
Fig. 6-2
CXD1914 (Serial) check in test mode
menu "0" Syscon Diagnosis (8-2)
Color bars
J354 S VIDEO OUT
(Terminating 75Ω)
Oscilloscope
1 ± 0.05 Vp-p
1 ± 0.05 Vp-p
Fig. 6-3