SHARP GA200 Repair Manual

$7.99

SHARP GA200 - It's a complete service manual, and it's in PDF format. It contains circuit diagrams ( schemas ) etc. It also usually contains parts catalog. After placing order we'll send You download instructions on Your email address. See below for delivery information

The manual is available only in language(s): English

Link to manual will be sent on Your email address after You place order.

This product was added to our catalog on Monday 07 May, 2007.

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Adam Solitro - 12/24/2007

A BIG Thank you!!!! Merry Christmas and Happy New YEAR!!!

Jim Carrier - 08/02/2006

Outstanding and fast service! I received service manual in a moment after order. Thanks to this manual I can use my printer again!

Jacek Madej - 08/30/2008

Hi! love you!! schematics circuit best scan electronics area ...a have old radio grundig c8000 seek from net ... very done... hello best regard Edi from Poland

Roger Mason - 07/28/2006

Man, I was looking for this manual for a while! Where do You get them?;) Of course, quality is goooood:) Anyway, I can only say: A+A+A+!

Peter Rawson - 08/02/2006

Wow! I thought I wouldn't be able to find manual for such rare equipment like KM2000E. And here it is! Thanks for fast service!

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Click to see text excerpt from the manual

GA-200
SERVICE NOTES
DEGAUSSING COIL CONTROL CIRCUIT
Introduction
The cathode ray tubes are demagnetised with a magnetic field produced by a decreasing sine voltage which passes
through the degaussing coil. Figure 1.
To create this voltage, the sine form of the mains voltage is used, and a PTC resistance is incorporated; as it warms up,
this brings about a reduction in the current over time. A triac (SCR) is incorporated in series with the circuit, and this opens
and closes the passage of current through the degaussing coil and the PTC. Figure 1.
DRAFT 2
(G)
PLGN0207
C702
10nF
(250V)R756
KZ0029CE1K8JF902
R755
100
(1/2W)
XZ0224BMR901
C904100KD903
POR701IC7091uFEX0421BM
P0001BMTLP165JC748
FX0111Q902.220uF
TX0232(25V)
Q707R902
BT134WR906
770SX0003BM2M2C902
20K33K22uF
/2W)R905(50V)
C71422K
680D902
R903D901EX0554
DX0551
Q901
TX02321KD711
R904C903R907DX0045
C905 27K47uF100K.
470nF(25V)
R730C706R706
4K7680nF390K
(15W)(400V)(TQ)
D702D704
GPP20JGPP20JR708
701DX0641BMDX0641BM390K
70nFL701(TQ)275V)F0108BM
219BM
R712R783
C746390K220K
330nF(TQ)
(275V)
FZ0188BMC712
C7041uF
MC70310nFR705(160V)
10nF250VR758
250VKZ0029CE8K282R
KZ0029CE(1/3W)
D701D703XZ0123BM
GPP20JGPP20J
DX0641BMDX0641BMR714
0.56
(3W)
Figure 1: Demagnetising Circuit
Control circuit
A new Degaussing triac control circuit is introduced, to prevent the PTC from conducting indefinitely once demagnetisation
of the tube has taken place.
When the supply is turned on, a voltage pulse appears in D711, which has a twofold effect: Firstly, charging C748 with a
continuous supply, and secondly, causing a voltage peak through C903, which saturates Q901. The slope of the pulse that
saturates Q901 increases in gradient thanks to the pulse produced by C902.
When both capacitors are charged (C903 and C902), they slowly stop conducting, causing Q901 to cut out; Q902 is
automatically saturated, causing C902 to invert the polarity, which gives rise to Q901 cutting out more quickly.
The circuit remains in this state indefinitely, until the television set is turned on again, or it leaves ?Stand-by? mode.
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