Ikegami HTM-1990R Service Manual page 44

DEF BOARD/HV OUT BOARD
(1) Circuit Structure
(a) Vertical deflection Circuit
(b) Horizontal deflection Circuit
(c) Protection Circuit
(d) Horizontal centering Circuit
(e) Rotation Circuit
(f) Dynamic focus Circuit
(g) High voltage output Circuit
(2) Adjustment Method
(a) EL101 [EL Bit Switch] : DEF BOARD
Select ON-OFF of rotation circuit. The default value is ON.
(b) VR501 [O.S - 7] : DEF BOARD
Set so that the DC level is 5.5V if the H.FOCUS and V.FOCUS data is 0% for TP501.
(c) VR601 [H.BLK WIDTH] : DEF BOARD
Set so that the pulse width of the negative pulse is 2.5 uS for TP606.
(d) VR602 [1080_ H.CENT_ADJ] : DEF BOARD
Set so that the raster comes to the center position of the screen for 1080i/60 input.
(e) VR1 [X-RAY PROT] : HV OUT BOARD
VR2 [HV ADJ]
1. Connect the high voltage meter to the anode cap of the CRT.
2. Set CONTRAST VR and BRIGHTNESS VR to the manual mode and set to MIN.
3. Temporarily set the high voltage output to the following values with VR2.
HTM-1517R
HTM-1917R/1990R : 28.5KV
4. Rotate VR1 from MIN in a clockwise direction up to when protection operates.
When protection operates, turn the power switch OFF.
5. After returning the setting position of VR2 from the MIN position, turns the power switch ON.
6. Use VR2 to set the high voltage output as follows.
HTM-1517R
HTM-1917R/1990R : 26KV
1-C-2
: HV OUT BOARD
: 27.5KV
: 25KV