Hantarex Monitors:
Problem: Possible Solution:
Blank screen Replace RV7 with fixed resistor 220K ohm @1/2 watt & C34.
Picture expanding horizontally Replace C42 4.7uf 63 vdc.
No picture Replace R32 – 680 ohm @1/4 watt & C11 – 10uf @ 100vdc
Sync problem Replace TR1, TR2, TR3. Using 2N4401, possible installed reversed.
Tripole Monitors:
Problem: Possible Solution:
No Vertical sync Q301, U25
No Brightness Control R11 Open
No picture C301 Cold Solder joint
No horizontal centering Adjustments
No sub brightness VR203
No video Bad connection to pin connector
No Video Cold solder joint neck board
No video Red & orange wires shorted on neck board
No sync Q301
No brightness controls Cold solder joint L401
Orange screen Q305
No power up R405 680 ohm & C403 10 uf 50 vdc.