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Posted on Jan 02, 2017
SOURCE: Betacam SP VTR problem - CVR-75
First look under your console there is a timer with display,check T2 and if it is more than 3000h(300x10) you'll have to replace the upper drum.But FIRST;FIRST you need a service manual specially volumen 2 its the same for sony BVW75.
Next you need two extender boards,two channel osciloscop with two probes and if its possibile test tapes.As you described you have problem in luma chain,one of heads is or dead or its signal is too low.You can check it on DM56 board TP3 as I remember and second probe is trigering on TP901.You should get 0,7volts packetes for two heads(DT select to OFF)adjusting for ch-A is RV3,and for ch-B RV4.Step2 is to set DT select to VAR and check 0,7volts on same TP.Adjusting is RV2 for ch-A and RV7 for ch-B.Then go to TP101 on same board and adjust Y AGC output level to 1V with RV101
Same procedure is for the chroma chain TP505 DT select to OFF.Chroma level is 0,6V and adjusting is RV502 for ch-A and RV505 for ch-B.Set DT select to VAR and check 0,6V.Adjusting is RV501 for ch-A and RV504 for ch-B.Then go to TP508 and adjust C AGC output to 1V with RV512.Trigering is TP902
All adjustements are in playback mode with aligment tape CR5-1B PS playing flat field signal
All measurements are with osciloscope
If you can't get those values replace upper drum and try again (you'll need micrometer to center it)
If pockets are not streight (have deformations) you have to do tape run alignment
I repeat NOTHING of these can be done without extender board
Posted on Sep 16, 2008
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