Control Circuit - Commodore 1701 Service Manual

R04tRO~
Colo.,. contT'ol
'Ro~ 'fen: COLOR VR
does not
functlon.
Rot.R02 .R03
Tint c.chhol
'ROI
open} .
L.~_
I •
red
IJ<;YJIY\4t
s
'ROl!fen .
,,"Q~entct
ROb. RO'7.KD&
Cmb-a.st
CDhtrcl
'Ro'!
open
;VR does
hot
functiol\ when
c.ontrast is
stT'O~
RO'i.RIO _.----,
BI'!eaer 'rl!~istlln(e
'RO~
'fen:
no raster
·RIO
epe" :
scree", becomes
abnOT"lhllily
bT'i~ht.
-RII.RIZ.RI3 - - - - ,
B"r
i':}ht
c..Jntto\
• RII opel\:screen beCDmes
s\;~htly
do;rk.
'R13
open
:BRICX:HT VR
does not
func.tion.
;~:~~~~=i<C~O~L~O~R~):~~~C~O~N~T~)~~~~.~r-~--~--
__
~
3
~~~ ~
RC4 \
ROa R09
~~K
/
('-V-CL-U-M-E)
IOK8 5.6K 470
(8RIGHT)
3
RI6
CONTROL
RK-
,RIS" - - - - - - - - - - .
V. Hol<l control
. Rlf
ore" :
when 1/. HOLD VR is
turned to
""'(lX,
vert\cal
oscillatio n
beco/lll$
minimlAIn (approl(. 3cm)
Rib.
R2~
- - - - - ,
H. Posit;Oh cllrltrol
I ~
"'-R03
R02 IOK8
RI2
IOK8
Rt4
6.8K
5008
l'-~H
·Rlb Q)open:
f~L4ltl
hoYizDr
10.1 sy'f\c.
B2K (TI N
r )
(V.
HOLD)
R23
1.51<
1l
I ,
R2: 4.7K Ria
~
ISU88RIGHTI 1.8K
RI9
::~
____________________
~/~
________ -+ __
2_._2_K~
RZO
470
12V
.GE-4000A
I
I
I
,
R21
2.:"1(
CONTROL:J
CB
' .
A'SSY .
~ :
L __
R22. 'K23 - .....
1-.....
Su.b byi<j.hl:
c:.onhol
R23~:no raster
-
R\~.Rlq, R20.R2\ ---'-....,
Bleeder 're<>istarlce
• F:
\~ ope;,} screen bec.omes
. P.l'1
open
;sli~htll
da.rk.
' R20
o~n
: coloy is faint.
·R2.1 0Fn.: screen becomeS
sli~.htl)' bri~ht.
CIRCUIT NOTES
Although specifically written on the
1701 monitor. most circuit theories
apply to the 1702 also. Refer to the
1702 achematic
for
differences in com-
ponent values and identification.
13