Technicolor - Thomson LDK 20(S) Gain Video, White limiter, Output amplitude readjustment

Page 41

Digital Video Processor

Gain Video

1.Place Digital Video Processor on service extender.

2.Switch off colour bar and Test sawtooth on.

3.Adjust white output amplitude.

Measure at: X51-21 (R)

X51-11 (G)

X51-22 (B)

Adjust with: ZR232 (R)

ZR432 (G) ZR632 (B)

Required result: +1400mV (R)

+1400mV (G) +1400mV (B)

Correct:

 

0.5V

10µS

100

 

90

 

10

 

0%

 

 

VA+1.40V

White limiter

4.Set gain to +6dB. In setup 1 menu set white clip on.

Set individual white limiter to: Master G = 60, R = 60, B = 60.

5.Adjust output for a video clip level of 102%.

Measure at: X51-21 (R)

X51-11 (G)

X51-22 (B)

Adjust with: ZR341 (R)

ZR541 (G) ZR741 (B)

Required result: +1428mV (R)

+1428mV (G) +1428mV (B)

Correct:

 

0.5V

10µS

100

 

90

 

10

 

0%

 

 

VA+1.43V

Output amplitude readjustment

6.Set gain to 0dB. In setup 1 menu set white clip off.

7.Readjust white output amplitude.

Measure at:

Adjust with:

X51-21 (R)

ZR232 (R)

X51-11

(G)

ZR432 (G)

X51-22

(B)

ZR632 (B)

 

 

 

VF-Mon output

8.Test sawtooth on.

9.Adjust Y-output amplitude.

10.Adjust output dc level

Required result: +1400mV (R)

+1400mV (G) +1400mV (B)

Correct:

 

0.5V

10µS

100

 

90

 

10

 

0%

 

 

VA+1.40V

Measure at: X52-24

Adjust with: ZR841

ZR830

Required result: +1400mV

0mVdc

Correct:

 

0.2V

10µS

100

 

90

 

10

 

0%

 

 

VA+1400mV

11. Return Digital Video Processor to its position in the camera.

Adjustments

Technical Manual LDK 20(S) - Studio Camera

4-15

Image 41
Contents Technical Manual Declaration of Conformity LDK 20S Studio Camera Technical Manual Contents About This Manual Service policyPurpose of this manual Intended audienceSection Safety Instructions According to IEC65 Safety SummaryCathode ray tubes EarthingTechnical Manual LDK 20S Studio Camera Safety Instructions Section Installation Packing/Unpacking Local / Remote Power SupplyLocation of adjustments Hardware Setup and CustomizationTest Sawtooth Lens matching Internal signalsExternal signal Analogue Ch1-Ch2 Dipswitch SettingsExternal Aspect Ratio Switch Cadre appearance Viewfinder Cadre IndicationCadre On/Off Audio microphone signals Audio / Intercom settingsIntercom headset signals Intercom microphone signalsPrivate Data Triax connector Connectors and CablesVTR connector Pin female panel view part number 3922 Viewfinder connectorAudio microphone connectors Camera headset connectorData connector Auxiliary connectorTracker communication connector Cable connector part numbers Script light connectorCamera system Specifications LDK20Section Replacements Printed circuit boards IntroductionFront module Filterwheel Cassette Power supply Section Adjustments Adjustments Set-up Instructions Test EquipmentExtender Board Video Processor 1 Board Setting-up the CameraSync./Shading Board Vertical sawtooth offset Black OffsetZR206 ZR111Ampl R Ampl GVideo output Test Sawtooth Nominal Settings 15. Sawtooth amplitudeDigital Video Processor Black Offset Level Digital Video Processor Subboard Ntsc Gain DACZR525 X51 ZR541 Black off set Limiter sharp G MP500 ZR830 Gain Video Output amplitude readjustmentWhite limiter VF-Mon outputZR85 ZR92 Video Miscellaneous BoardSync Ampl LevelB-Y white balance VF sync. oscillatorOutput amplitude ZR85 ZR92 White Pulse Video Mux output AmplitudeVideo Miscellaneous Board Monitoring camera output White pulse amplitudeB/Y/VFCNT Black indicator level Indicator ZR90 Start IndicatorEnd Stop ViewfinderFocus bar Zoom barX55 DummyBlack Shading Correction Setting-upZR666 ZR265MP409 ZR465 ZR466 Pulse compensation Dummy offset adjustmentDC level adjustment at 45oC ZR238 ZR237ZR239 ZR637Edge gain correction Edge clip levelHor. sawtooth correction Nom. Exp Hor. sawtooth correction 1/1000 ExpZR208 Saw BlackZR214ZR211 Offset RWhite shading exposure Sync/Shading BoardVideo Miscellaneous Board Auto iris ZR203 Chroma Encoder Board PALBalance Balance R14Cvbs amplitude Set-upBlack balance ZR202 Burst PhaseGain ZR211Burst phase B-Y phaseZR217 Sc-H Phase Osc. PresetZR209 BurstSc-H phase relationship Genlock free-running presetBurst amplitude Burst timingEncoder Board Ntsc White bar amplitude MP8 ZR205Smpte bar shift MP7 90 phase Amplitude ZR201ZR207 ZR215Bar amplitude Adjust the I and Q bars for an amplitude of 286mV 40 IREZMP0 Audio/Intercom LF BoardAudio 1 limiter Audio 1 levelAudio 2 level Audio 2 limiterAudio/Intercom LF Board Cameraman intercom microphone PL Cameraman intercom microphoneLimiter level camera microphone Cameraman intercom microphone TRSAudio/Intercom LF Board CH2 fork attenuation ENG Audio/Intercom LF Board RTS ModeCH1 fork attenuation Prod Pre Processor Board Pre-Processor Board Gain AdjustmentTechnical Manual LDK 20S Studio Camera Section Drawings Block Diagram Power Signals 104 RZ 610 RZ Block Diagram Video SignalsPanel Block Diagram Transmission SignalsData Board Block Diagram Control SignalsTechnical Manual LDK 20S Studio Camera