[labnetwork] Dektak 3030ST: CRT Horizontal Sync Issue ? Seeking Advice and Service Manual

[yyasuda at t-kougei.ac.jp]

Dear LabNetwork members,

 

I am a researcher at a university in Japan working in a thin film
laboratory. I am currently experiencing a serious display issue with our
Dektak 3030ST and would greatly appreciate any advice from members who have
experience with this system.

 

--- Current Symptoms ---

1. The CRT screen image continuously scrolls horizontally and cannot be
stabilized.

2. White and black screens appear alternately. see attached files.

3. A horizontal band appears from the top of the screen and drifts
continuously to the left.

4. When the EXT SYNC cable is disconnected, the camera lamp remains on
continuously and the camera image is displayed normally. However, the
horizontal scrolling on the CRT persists.

 

Based on symptom 4, we believe the camera itself is functioning normally. We
suspect the issue is related to the H-SYNC signal circuit on the CRT board,
possibly caused by accidental adjustment of the H-HOLD or horizontal
frequency trimmer.

 

--- What We Are Looking For ---

1. Has anyone experienced a similar issue with the Dektak 3030ST and been
able to resolve it?

2. Does anyone have access to the service manual or circuit diagram for the
Dektak 3030ST, particularly the CRT display and horizontal sync adjustment
section?

3. Any guidance on which trimmer controls H-HOLD vs H-POSITION on this unit
would be extremely helpful.

 

Thank you very much for any help you can provide.

 

Best regards,

Yoji Yasuda

Tokyo Polytechnic University
e-mail：  <mailto:yyasuda at em.t-kougei.ac.jp> yyasuda at t-kougei.ac.jp

 

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