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Can you get the horizontal bar to roll both ways (up and down) with the vertical hold control? Can you get the horizontal to sync even for a moment by with the horizontal hold control? If the answer to either of those is not then the circuit associated with the control needs more work and or adjustment. If the answer to both is yes go after the AGC and synch seperator stages....Try adjusting the AGC if it synchs with good contrast your good if all it does is change the video level leave it at a setting that gives reasonable video and move on to the synch sep (check it's resistors).
The vertical will need to have it's resistors checked if it can't be rolled both ways with the hold control. If the horizontal can't be flopped both ways first try adjusting the slugs of the osc. transformer (assuming it is a synchroguide circuit)....Get it in synch, and then use a scope to get the peak and hump of the waveform roughly the same height (crucial for stability).....If the osc. can't be adjusted for sync. then check all the resistors in the horizontal.
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