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5
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Model No.: HTS-898-266
Version: 1.0
TROUBLE SHOOTING
* Before repair, please make sure the local power supply is 220V~240V.
1. Cracking,
Small
sounds
Analyse:
A) If the input signal accompany with direct current, it possibility strikes the selecting IC CD4052,
then cause the sounds cracking, and small.
B) The electric capacitor 47uF/50V of center and surround output is invalidation by the effects of
temperature and humidity, then sounds will be small.
C) The possible damage parts : CD 4052 and PT2253
1. PT2253 function : Volume control
2. CD4052 function : Dual 4-channel Analog Multiplexer
D) Testing whether the IC CD4052\PT2253 power supply ( +5.1V ) is natural.
Solution: Change damage parts.
2. Hum
sounds
Analyse:
Filter electric capacitor 3300uF/50V will be invalidation when it is at high voltage or high
temperature and humidity
Solution: Change damage capacitor 3300uF/50V.
3. VFD display damage
Analyse:
a. Due to the working voltage of VFD is connecting to the transformer, if the voltage is too
high, easy be burn out the VFD display.
b. The filament of the display is friability, so must avoid to strong shock, or more
c. easy mangles the display.
d. The possible damage parts: VFD display, electric capacitor 470uF/50V and diode IN4004.
Please refer to the Front panel control Diagram
e. Testing whether the power from transformer to the front panel controller is natural, AC22V
and AC6V.
Solution : Change new parts instead of the damage parts.
After repairing, momently power on, observing whether the VFD is abnormity.
