Commodore 1701 - COLOR DEMODULATION CIRCUIT

• 1'10 piduye
T30i ---,
BP take~off transf.
,---- c302
Br-~~ conQenser
.open: colD\" beccmcs
$rk
'short; no color
R!oi---.,
Dumpi~ ~is~nce
"open :c%Y error
4Vp-p
C303
N:.c smoomlnj
•
open : no ~clor
R3,-3
Emmire~ ~ ... -tGn~1e
- C3
0
4-
Cou~in3 Cl)ndens~r
.open: hD coloy
"sheet: no picture.
c30S --...,
K i \l~ smocil\,'i
. .:yw "\: ltO ~Ior
's~rt\
C304i:C305
180 -.45/50
R328
1M
R302.R303
Co\Oy c:orrec.tloh
(bleeder feS'StllllC~)
color i~
'R3Dl open: faint
'R303 nDf!Tl: color is
·r _ .. dink
R304, R3DS, R322
tl\'\t c.orrectlon.
(bleeck.r ..-n\S~)
·R304 ore"': Yec:\ ro.steY'
be.comes lnDihel11'o...
'R:30!) 'f"'l Hed bf.CDtneS "ftl,,,t.
~ beCCl'les
bi ... e \:)ecomes vic,e.,-.
·R311. ~ : titlt VR doeS !\Of:
fu nc-U on
R.321
.- ____ AAr...rIK ___ _
+
10.7V C 316 z:::
10116 I
~
/
I
R316
22K
·only tnDl1Ocln·omAtic.
·no ccioY, edDY -fad~ away
·no monochroma.tic..
+.d-
IC301 HAII247
B.P AMP, ACC,KI
TINT, APC, VCO
a COLOR OEM
I
.'
· fnultr tint
"c.cicr no;SE!
• cclor el'"rcr
. faulty color sync.
. czlcr beat
·dc. ..•
.----c306
Diff4e~n"ti4TeS,'5rnc. si~ ",,\, a,"'cl
clela.ys fho.o;e of- pllise.
'OI'en : r-o"coloY
. short : 1'0 pIC tttYl!.
dark yaster
TP~5°1 I ~
0301:!: I
S2473H ~5~6
C306
180 T ~ ~
0302_.
ER,
1 S 2 47 3 H ,-c~r-.-:.::I 5::.:.1.:.55:,:5::.,
0303-0308
W06-A,W06-8,151555
R310
L351 330
~~-+----------~~.-~
or 1512473
22
0307 I R311 330 I
~----------~------.-~~-+-~
0306 I I R312 3301
G~53--~~~I~~~I--r-~I-~
R314 22 :. ~ • J30g
2.2K ~ -:- ..!...
R322
~ 10K
030'1, R307.R30!i'-L.----.
For phase shOt ft
C310,C311,C312 ---,
'By" p'l~'" condl!nser
-- D 30 I .---I.~-,
Foy noise prevention
.shon:: c:oloY' errOl"
'C30'7 short :5C~n bec..::m'!s
bei'.1ht \:I."t ho ccjOl"
'00'7 opt'll } obtain~
"R307 open :no color
"R301? cpen
(ootp'lt "IT;.. ba.se-~TCu.ncied
with T6rect to \U7'O\i"o."c:e sl'y,a.I)
. <:310 shan' no caree.n Y'IsteY
. C311 shcrt: hO red ro.S teY
·c312. short: no bilAe. ra.s!er
130 I. c 3
0
&>,R3o'7, c309 -
3.s8MH~ filhr
·'('3ot o~n ,';hoT"t }
·c308 op~" :tlO colo ...
'R30'1 open
'C 3017 ope ... , sho~t
G3\3,C 314, R3\3. R~\4
APC s",ooth~,,:}
'C313 Shod}
.c314 shOTt :1\0 color
. R 3 i4- open.
~- L351,L31>2.
L3S3
t\ ;,h t"re:tu'!n"ff: It ~Y"
· L?S \ opQ.n: ydlcw fictu.re
· L ~52 ~ :cpM;c.rictLlI't.
· L 3 S"3 ,,~" : m<l:1',enta
ftC.tun~
COLOR DEM. CIRCUIT
"f..301.R315;1~3 1.6. R3f'7
R3i'iLR321,C316
Su.~r-scene ccnh-ol
'R~15 open.
"R 316 open Got\t~st
'R31'T oru' becomes
.R32\ open weo.k
·(.31b short
·xaot open
CIRCUIT NOTES
Although speciflcally written on the
170 1 monitor, most circuit theories
apply
to the 1702 also. Refer to the
1702 schematic for differences In com-
ponent values and Identification.
D302.---...,
Be"'" I:",iter diode
. short : br;~h+et1.
R310,R3i \,R3i2 ----,
Ie pl"t'tection reSistor
'R310 "pet: yellow i';ct ...... e
'R311
·R312.
cpen: cyanic p;cture
open. : 1Tla.'Jhent~ t
1 pIC ure
D303 ....... D308
Roted,on. of Ie frt,.,,, CRT SFrki"~
·E>303 short: bllA4e picture
"i) 304 short: · .... ed pIC Tt.U'e
,-£)30 S short: ~reet'\ fic rure
1 1