NEC DPro2070SB, Руководство по обслуживанию

Страница: 83 / 108

3.2.5 Linearity Failure
3.2.5.1 Horizontal Linearity Failure
CS8 CS7 CS6 CS5 CS4 CS3 CS2 CS1
64pin 63pin 62pin 61pin 60pin 59pin 58pin 57pin
Q562 Q561 Q566 Q565 Q568 Q567 Q563 Q564
1 31.5 H L L L L L L L
2 46 L L L H L H L H
3 60 L H L L H L H H
4 69 H L H L L H H H
5 80 L L H H L H H H
6 91 H L H L H H H H
7 93 L H H L H H H H
8 106 H L L H H H H H
9 112 L L H H H H H H
10 120 H L H H H H H H
Preset
No.
Fh
[kHz]
Expected failure point
IC102 on the MAIN PWB or peripheral circuits
CS switching FET Q561 to Q568 are H: Off, L: ON
NG
Expected failure point
1) Relation of Character S capacitor changeover
Q561- Q568, C564- C568, C576-C578 or C580 on the MAIN PWB, or
peripheral circuits
2) Relation of linearity coil control
Q560, L561, IC101 or peripheral circuits
Check the horizontal frequency band selector.
Check voltage at Pins 57-64 of IC102 on the MAIN PWB.
OK
3-9