Zanussi 22ZT907, Service Manual

Page: 15 / 64

MAIN COMPONENTS
BS 400.2 Chassis
BS Tuner IF video/audio
p.c.b.
It supports the p.c.boards and
it supplies voltages for EHT,
focusing system and CRT heaters.
Conversion of the RF signal into
an IF signal (video carrier:
audio carrier:
Detection of the IF signal into
low frequency video and audio
signals.
BS Luminance-chrominance and
This p.c.b. processes the
video amplifier
complete composite video signal
coming from the IF p.c.b. and
supplies the R-G-B signals to
the picture tube.
BS 401 Audio p.c.b.
This p.c.b. receives the audio
signal (not adjusted in volume)
coming from p.c.b. BS
it
adjusts it in amplitude and
tone, it amplifies it and sends
it to drive the two receiver's
loudspeakers (tweeter and
woofer).
Through jack PR 201 it is
possible to connect externally
an auxiliary 2.7 Ohm loudspeaker
with or without the exclusion
of the internal loudspeakers.
Furthermore, the p.c.b.
transferes the audio signal
(not adjusted in volume) to
taperecorder and headphone
jacks.
No adjustments needed.
BS 470 Mains filter p.c.b.
BS Power supply p.c.b.
The p.c.b. includes circuits
relevant to: mains filter,
degaussing,
remote control
start remote control.
No adjustments needed.
It includes circuits for
clock supply and for switch-ON
programming.
No adjustments needed.