Chase HQ Restoration

Original one was pretty nasty so spent awhile sourcing some new parts. Even though this part is hidden i could not just leave it!! Managed to source exact ballast, tube (T5 8W), metal clips, better speakers (8 ohm), new black screws, silver reflective card

. 

After

First of all had a look over it once removed and it looked like it started life as a hanterex polo and then at some point the analogue board was replaced for a kortex ktn20.

The picture was missing red, was on the slant, was blurred, was too far to the left and was dim! The missing red turned out to be on the pcb board which i will get to later.

Picture on screen as arrived

Monitor as arrived when removed

Decided the best thing to do was, strip it down, do a full cap rebuild, new HOT, new flyback and see what it was like then

Stripdown

Cleaned, and new parts fitted

This gave me this picture and a new issue with warm up and it taking 5 minutes to come on! Slightly disappointing to say the least@

After much messing about with adjustments and settings, test screens i worked out the green level was way out and all other settings needed some tweaks.

This gave me this. Better picture but still on a slant and still taking 5 mins to warm up

Monitor back out again!! Spent ages trying to work out what could cause the last 2 issues. Monitor yoke was factory position so i could not understand why it was slanted. Also took a look at the b+ pot on the pcb which was not easy as its glued in position. Once removed and on the bench i realised it was not working correctly.

The schematic said 2K, the pot on the board was 3K stamped and it read 4K!!!!!!!!!

I determined that at its setting of middle it was in fact like a 2K pot at max.

Replaced it, monitor back in and instantly on!! Nice

Back to the slant problem, monitor back out again!. Read up on twisting yokes slightly by releasing the clamp and rubber spacers. Sounded super scary, but no balls, no glory! So went for it and wasn't that bad to be honest, if taking your time

Final results

Many thanks

Resprayed the bezel supports and recovered the foam protection as the old was deteriorated and nasty draft excluder stuff. This new stuff is black (not white like the original) and neoprene soft foam, 2mm thick. Used black screws for mounting them to the cabinet so as to blend in better.

Also, installed the awesome cardboard monitor surround that olly cut out for me to my design. The old one was warped, stained and generally nasty. This covers up the mounting bolts for the monitor when the bezel glass is back in position.