BELMONT 546 SCH
(PDF)966.3 KB
1
AUDIO
SERVICE MANUAL
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BELMONT 546
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Original problem is no sub woofer output. Been through this one and recapped it and the common 2 burned 1K (R16/17)
resistors are replaced but the sub is still not responding. Volume control potentiometer is a common issue on these but
the L-R spkrs sound good.
Went by this webpage on the repair:
https://christopherbradshaw.net/The_Project_Bin/klipsch%20promedia%20subwoofer%20repair%20-%20page%201.html
On the schematic there is a sub-relay (sw101) powered by +V_HF line it
maybe is suppose to be +V_LF ? Without the relay coming on looks like the sub is disconnected.
The zeners (D03/04) that give +/- Vcc to the op amps seemed way off so I replaced them and the voltages seem much closer.
Theres also a sub-mute line on p104 to p101. Power supply shows the LF mute relay and interconnect diagram says it
gets fed from the LF amp. What is triggering the mute? I dont see a mute button anyplace.
Meg kéne menteni egy ilyen remek kis magnót (igen tudom, hogy az F220 a csúcs, de nem mindenkinek jut belőle...) Sehol (itt a tanyán sem) találok hozzá olyan SM-t, ami tartalmazná a mechanika rajzait esetleges beállításait. Csak kapcsolási rajz van fent.
Tudna segíteni valaki ebben? Van valakinek esetleg ilyen manuálja? (A wanted-ba is feltettem, de csak megoldatlan sorokat látok... :-( )
Előre is köszönöm!
Gábor
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