TELEREADER CWR-685E, Service Manual

Page: 14 / 40

14
(B) Fluctuating display
The power source requirements of this System are voltage of DC 12 to 14.5 V and current of not
less than 1.65 A.
Power source conditions
1. Stabilized power source is not necessarily required. The System can operate on a power source
containing slight ripples.
However, the voltage should not be lower than 12 V at the bottom of ripple. Below 12 V, the
performance of built-in display becomes unstable.
2. In the case of power source containing ripples, the average voltage should not be more than
14.5 V.
If the display screen still fluctuates though conforming to the requirements above, check as fol-
lows:
Is the voltage at connector terminal J1-4 on main PBC within a range of 9.7 ±0.5 V?
ZD1 or IC48 is broken Is there any object emitting lines of magnetic
force nearby (such as power transformer and
speaker)?
Wrong adjustment of V-HOLD or video center of CRT unit,
or CRT unit is defective. Remove the object.