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Service Technical Information
MODEL NO. SUFFIX
TV C1421 / C1422 KER / KE−
TV C2121 SHR−
SUBJECT
A beat noise problem REF No :G A2 00 2 E0−− −
DATE :30.MAY.2002
<CONTENTS>
A beat noise problem may arise by influence of the power supply circuit.
Especially, this problem will happen in low electric field or VHF LOW channel.
<COUNTERMEASURE>
To avoid being influenced, modify the power circuit as following countermeasure.
1. Replace the FB830 and FB831 in the secondary stage of the power supply to the jumper wires.
(see fig.2)
2. Remove the JW606 and JW608 which connect the GND traces.(see fig.3)
3. Replace the JW801 at the primary stage of the power circuit to the ferrite beading.(see fig.4)
fig.1
Ref. Parts Code Description Remarks
−−− − −JW801 87 003 320 080 F BEAD,FBR07HA121NB
G R Code No. Access Code Modified Ser. No. Parts Schedule
−− − − − −
7
12
6
5
4
17
13
18
PT801
115V
13V
FB830
JW801 FB
(TV−C2121 only)
14
15
9
8
10
11
16
3
2
1
JW
FB831
JW
Rectifier circuit