SERVICE MANUAL MODEL 1701/1702 MONITOR Preliminary OCT. 1984 PN-314004-01 Commodore Business Machines, Inc. 1200 Wilson Drive, West Chester, Pennsylvania 19380 U.S.A. Commodore makes no expressed or implied warranties with regard to the information contained herein. The information is made available solely on an as is basis, and the entire risk as to quality and accuracy is with the user.
CONTENTS Page Title SPECIFICATIONS 1 SAFETY PRECAUTIONS ......................................................................................... 2 ADJUSTMENTS PURITY ...................................................................................................... 4 CONVERGENCE ........................................................................................... 5 WHITE BALANCE ........................................................................................
CONTENTS (Continued) Title Page 1701 PARTS LIST .. ............................................................................................... 23 1701 BOARD LAyOUT......... ................................................................................. 30 1701 SCHEMATIC NOTES ..................................................................................... 31 1701 SCHEMATIC ................................................................................................
C1701/C1702 COLOR MONITORS PRODUCT SPECIFICATION GENERAL DESCRIPTION The C1701 and C1702 are quality, high resolution color monitors, designed to maximize the video capabilities of your Commodore Computer. They give you a superior color picture that enhances your computing experience and are completely compatible with all Commodore equipment. SCREEN SIZE 13 Inch (screen measured diagonally).
SAFETY PRECAUTIONS 1. This product contains special designed circuits and components that were designed for safety purposes. For continued protection, changes should not be made to the original design unless authorized in writing by the manufacturer. Replacement parts must be identical to those used in the original circuits. Service should be performed by qualified personnel only. 2. Alterations to the design or circuitry of this receiver should not be made.
SAFETY PRECAUTIONS (Continued) 8. ISOLATION CHECK (SAFETY FOR ELECTRICAL SHOCK HAZARD) After re-assembling the product, always perfrom an isolation check on the exposed metal parts of the cabinet, screwheads, cable jacks, controls shafts, etc., to be sure the product is safe to operate without danger of electrical shock.
ADJUSTMENTS - PURITY, CONVERGENCE AND WHITE BALANCE PICTURE TUBE The picture tube is a precision in-line gun type. For this picture tube, dynamic convergence is carried out by a precision deflection yoke which eliminates the use of a convergence yoke and a convergence circuit. The adjustment of the picture tube is therefore made easier as only the adjustment of static convergence by using a magnet is enough.
(FRONT VIEW) (FRONT VIEW) l) GREEN \ AROUND~ CENTRE ~ MAGENTA STATIC CONVERGENCE & DYNAMIC CONVERGENCE Static convergence is achieved by four magnets located on the neck, nearest the base of the picture tube. The front pair of magnetic rings (closest to the purity tabs) are adjusted to converge the red and blue crosshatch lines. The rear pair of convergence rings (closest to the base of the picture tube) are adjusted to converge the magenta (Red/Blue) and green crosshatch lines.
NOTE: 1702 locations in ( 8 1 VOLTAGE - ). Inject a video signal 1701 (110V) Regulate VR, R109, for B1 adjustment so that Dc voltage between TP-91 and earth is 110 volts. 1702 (125V.) Confirm that the voltage at TP-94 and IC901 pin 4 is 125 volts. NOTE: Meter should be periodically calibrated at 20K ohms/volt. FOCUS Adjust the FOCUS control for best overall definition and picture detail at normal brightness and contrast. VERTICAL POSITION Adjust the V.
SUB TINT AND SUB COLOR 1. 2. Display a picture and set the tint and color VRs on the control panel to the central click position. Adjust the sub tint VR, R305 and sub color VR, R303 for the optimum display. SUB CONTRAST AND SUB BRIGHT 1. 2. Display a picture and set the contrast and bright VRs on the control panel to the center click positions. Adjust the sub contrast VR, R209 and sub bright VR, R22 (R863) for optimum display. COLOR SYNC 1. 2. 3. 4. 5. 6. Display a color video signal.
(X) (LUMINANCE) C Y (CHROMINANCE) AUDIO R 0 ACIN FUSE &. LINE FILTER POWER TRANSF: I F I I I I J BUFFER BUFFER VIDEO BUFFER !AUDIO AMP! &. DRIVE I I .1 VOLTAGE I i e 3.58 TRAP l I DELAY r-::UTPUT ~ It B1 I I I I VIDEO AMP. I iI CONTROL iii I I I I i VERTICAL OUTPUT I HIGH VOLTAGE RECT. I '--- '---- H -- --- V roo-- 1 COLOR DIFFERENCE ::E C I- r---c; >< ~ irE r--- e fll.
VIDEO CIRCUIT 3 ~2 - - - - , Buffer r - - - )( C202 - - - - - , - -$hort : f""dtr sr(\~· ,C203 ope". For sync. "",pli fie .... -ope.n ; no color .©~short} : -@-®shart. emItt~r .5 )"nOoth i~ -ope It ~ fa. uIt)' sync. R2.oI,R202,C2o3 Sync. sera n~tor ~ln'I\"tc!'Y t;~ - cansiaht .In" \ Ope" I . eo 0"" is fuint IDc,Rh~:~ • !?ZOZ. cplU\ J : .c.2.o3c;hort -DL20I, R204 t>e.lQ.y of !u.tooi/1C1.l"\ce sitahGtI I ~"ct fa~lt)' condenser Srt1 c.. I -J. -snun.: .
AUDIO CIRCUIT . - - - - R607, C60q ----, N~t;ve teed ha.ck 'resistClhce DC c.u.t (.612. cOhde.I'ISIt.'f" Boc~;, . open: sound level becomes .c?~n : no souhd hi~h "R65D,C651 ~6DS',c608 Coupli~ TeSls~n~ C6~D Noise ab-;orb 1hp'4 to 'n!s~stClttce unci condehser ·shot"t :hO "Rbi 1 ------, ColO - - - r and cOhdenser' SOUI\Q T602 - -...... 1)601 - - - , BillS Y~stl1l\ce ·o~: 1"\0 Sl!l.Incl Couriil\l cohd~sel'" 'F-bOS" O~} Audio ou~~-t tT"(lhsf. ·open: no sound conde.nser L.
COLOR DEM. CIRCUIT "f..301.R315;1~3 1.6. R3f'7 R3i'iLR321,C316 R3,-3 Emmire~ ~...-tGn~1e C303 ,---- c302 Br-~~ conQenser c30S --..., N:.c smoomlnj .open: colD\" beccmcs • open : no $rk Ki \l~ smocil\,'i ~clor T30i - - - , BP take~off transf. R302.R303 Co\Oy c:orrec.tloh ..:yw "\: ltO ~Ior 'short; no color - R!oi---., 's~rt\ C3 0 4- color 'R3Dl open: faint Dumpi~ ~is~nce .open: "open :c%Y error hD coloy ·R304 ore"': Yec:\ 'R:30!) be.comes lnDihel11'o... 'f"'l Hed bf.
CHROMA OUTPUT CIRCUIT ~ ~~ . ©~ShOTt ®~short ope.n X\ot x 10Z XI03 nd bl",e yo.ster To-ster ~reen no blu.e no red Yo..ster Yo..steY" 110~ree.n. RIIS.Rllb,RII'1---. Rill, R1I3 . RI14 - - - - . Olltput Tr colle.ctor ioad resister 'raster • R,ll L '(llSter open: SCTeen of CRT cathod 'reSistor and Tesist.:>'" for · RII:3 open :SCfecn of red . RII b open: no red Ytlste.l" • R 114 opel1 :sc.reen of ~\'~ert .RII'7 open: no ~reen I I J ~ RII6 3.3K 112S Rlf7 3.
CONTROL R04tRO~ 'Ro~ 'fen: COLOR RO'i.RIO _.----, -RII.RIZ.RI3 - - - - , BI'!eaer 'rl!~istlln(e B"r i':}ht c..Jntto\ ROb. RO'7.KD& Colo.,. contT'ol Cmb-a.st CDhtrcl 'Ro'! open ;VR does hot functiol\ when c.ontrast is VR does not functlon. 'RO~ ·RIO 'fen: no abnOT"lhllily bT'i~ht. ~~~ ~ Rot.R02 .R03 RC4 IOK8 I • IJ<;YJIY\4t 'ROl!fen . ,,"Q~entct s \ R09 470 ROa 5.6K ~~K turned to ""'(lX, vert\cal oscillatio n beco/lll$ minimlAIn (approl(. 3cm) 3 ('-V-CL-U-M-E) / 3 RI6 5008 Rt4 6.
r- C4 0 2 . - r--- r---R403.R404 - - - - - - - - - , v40S V~'rtic(ll oscIIIa.tor bia.s circ.uit A nsoYb of bhOYm~( condenser 'R403 open: only Si~1e horizontcll lihe. V()1+~
HORIZONTAL OUTPUT CIRCUIT xo1 r\orizonto.\ outpu.t -open: 1"0 y~ste.'r hO sound \-\or il.O""o. \ dyive 1vo.nsf. 1rt . 1'10 yA steY" L 'sno no SOU ~ LS02,RSZ8 I HOl"iZDnta\ linearity Ic.orrect ion coi I a.nd C 530,C.531 Resohance condenser for FBT r - - - COl - - - - - . , "Prevention of unwll"\,ted ·opel'\ : horizonta\ width is small ,(Cldio:tion T 5"0 \ - - - - - - , . open. C$12,C~J3,CSI4 I C51: collector pulse clipper(for protection) )(S"O\ ISOO CSl4 1500 MPP MFP 1.
.---- R 103 l'y~vel'ltlon of excessive 'l'Ifut TO -X \01 Xo2 "powe.r ye~1I.1 ~tor .no<>.n : \-0,.; U>nto.\ width vr -,s ~\'"I\a.I\ d hol"izorttQ.\ width .. s s~a." • ~n. : ~-
TROUBLESHOOTING GUIDE No raster, no sound (B1 is normal) NOTE: 1702 locations in ( ). [Cause] Horizontal deflection circuit Problems in the horizontal deflection circuit hinder generation of high focusing voltage, BH 160V and B2 12V, resulting in no raster, no sound. 1. As long as normal BH 160V is generated, the horizontal output circuit properly operates, producing pulses during the flyback period of the saw-tooth wave current passing through the horizontal deflection coil.
No raster, no sound (81 is abnormal) NOTE 1702 locations in ( ). The regulator PCB assembly used in 1702 models differs from the 1701 power PCB assembly. The B1 voltage circuits should be checked beginning with IC901. [Cause] Abnormal B1 voltage indicates trouble in the power supply circuit. When B1 voltage is not only low but also abnormally high, X701 (Q501) of the X-ray protector is turned on, setting the collector voltage to 0 V.
No picture (no raster) with normal sound NOTE: 1702 locations are in ( ). [Cause] Malfunction of the video amplifier IC201, X202 (lC201, 0201) The video signal and the audio signal output are supplied respectively to the video amplifier IC20 1 and the audio circuit IC601 . Sound is had but no picture; therefore, the faulty part is IC201 and its external elements.
Only single horizontal line, normal sound NOTE: 1701 - First check if FR401 is broken or not. If this is broken, the trouble is due to short of X401 or break of 0401 . 1702 - Circuits in 1702 monitor differ but the operation remains the same. Check vertical controls/deflection circuits. [Cause] Malfunction of the vertical deflection circuit. When the vertical deflection circuit is faulty, saw-tooth current is not applied to the vertical deflection coil, resulting in a single horizontal line.
[Faulty parts and problems other than described] X401 open D401 short C408 short Vertical amplitude small (6 - 8 cm) R403 faulty A single thick (ca. 5 mm) horizontal line R404 faulty When turning V. HOLD, a black belt (V blanking signal) appears at the center of screen. The whole screen is dark and flickers. R405 faulty A single horizontal line. A picture flashing at about 1 second interval appears on the upper half of the screen. R407 faulty A picture of about 4 cm at the center of the screen.
Improper horizontal or vertical synchronization NOTE: 1701 and 1702 locations are the same. [Cause] 1) Defective horizontal and vertical sync: The sync separator and amplifier consists of an IC(lC201). The main cause of failure is often a failure of the IC itself. It is also necessary to be careful of a possible failure of the external components. Because the change of voltage at each pin of the IC is extremely small, it is very difficult to discover a failed element by measuring voltage.
Monitor parts may be secured locally. JVC part numbers have been provided for your convenience. ONLY Commodore part numbers (C314-xxx-xx) will be available from Commodore at this time. 1701 CHASSIS PARTS LOCATION JVC PART # DESCRIPTION OY01 J01 J02 L21 R05 S01 SP01 T01 T502 V01 Deflection Yoke Pin Jack Vid In Pin Jack Aud In Oeg. Coil Nonflammable Res.
Monitor parts may be secured locally. JVC part numbers have been provided for your convenience. ONLY Commodore part numbers (C314-xxx-xx) will be available from Commodore at this time.
Monitor parts may be secured locally. JVC part numbers have been provided for your convenience. ONLY Commodore part numbers (C314-xxx-xx) will be available from Commodore at this time. MAIN PCB ASSEMBLY #GE-1000A (Continued) LOCATION DESCRIPTION JVC PART # COM PART # RESISTORS R1410 R1414 R1415 R1421 R1503 R1509 R1511 R1512 R1514 R1515 R1522 R1523 R1528 R1532 R1703 T1704 Metal Film. 6.8. 1W. ± 5% Oxide Metal Film. 3.3K. 1W. ± 5% Oxide Metal Film. 2.7K. 1W. ± 5% Oxide Metal Film. 6.8K. 2W.
Monitor parts may be secured locally. JVC part numbers have been provided for your convenience. ONLY Commodore part number (C314-xxx-xx) will be available from Commodore at this time. MAIN PCB ASSEMBLY #GE-1000A (Continued) LOCATION JVC PART # DESCRIPTION COM PART # CAPACITORS (Continued) C1513 C1514 C1515 C1520 C1522 C1523 C1530 C1531 C1610 C1612 C1613 Metalized Polypropylene, 1500 pF, 1600V, ±5% Metalized Polypropylene, 1500 pF, 1600V, ±5% OFZ0082-1525 OFZ0082-1525 Metalized Polypropylene, .
Monitor parts may be secured locally. JVC part numbers have been provided for your convenience. ONLY Commodore part numbers (C314-xxx-xx) will be available from Commodore at this time. POWER PCB ASSEMBLY #GE-9000A LOCATION DESCRIPTION JVC PART # COM PART # TRANSISTORS X9101 X9102 2SC1890A (E, F) 2SC2688 (K, L, M) DIODES 09101 09102 09103 09104 0910S Silicon Silicon Silicon Silicon Zener 1S1887A 1S1887A 1S1887A 1S1887A R06.
Monitor parts may be secured locally. JVC part numbers have been provided for your convenience. ONLY Commodore part numbers (C314-xxx-xx) will be available from Commodore at this time. CRT SOCKET PCB ASSEMBLY #GE-3000A LOCATION DESCRIPTION JVC PART # COM PART # TRANSISTOR X3101 X3102 X3103 Silicon Silicon Silicon 2SC2611 2SC2611 2SC2611 Oxide Metal Film, 12K, 2W, ±5% Oxide Metal Film, 12K, 2W, ±5% Oxide Metal Film, 12K, 2W, ±5% Composition, 3.3K, 1/2W, ±10% Composition, 4.
Monitor parts may be secured locally. JVC part numbers have been provided for your convenience. ONLY Commodore part numbers (C314-xxx-xx) will be available from Commodore at this time. CONTROL PCB ASSEMBLY #GE-4000A LOCATION DESCRIPTION JVC PART # COM PART # VARIABLE RESISTORS R4003 R4004 R4006 R4012 R4015 R4016 R4022 R4024 Tint, 10K Color, 10K Cont, 10K Bright, 10K V Hold, 10K H Position, 500 Sub Bright, 4.
1701 Board Layout r ~;U0.60R-<:3 1~ ~ L I T201 I o~ ~ ~OoJ !: 1 E O.O,,? B ) I DL201 W44 oft ~. ~V <::> O~ 0 ~1R204 ~~~~O ~~~ono.~o~ ~ 1 1~;; O~ C-~o::,. ~ : , ~ ~ -s.. !,l, 0.2"~ ~o'~202 -e:r ""'0 ~~oo-c=:r ~~ -----.r,.,";5. n 3 'W • :e=:::>- '"0 C NO ,c' 250 ( --1 )C515 ORN ORN 54 (])C509 ° c,s> R510 ~R506 R526 W43t- CS21 ~.Q ~ -c=:r..,'~ ~:u . . . N. "'. 0 ."'7.~ 0 '" ~N~~ 000' '" h~° U~-c=:r-dts,'l,. C2020 .c::t.31. ~ Ow::..
frtIIII 'I·IOQOA SPOI ~t8~IIA(B,C) r A/V f'ANEL (REAR TERMINAL) ~~~;:. '~;- II~HY ,., rt- ---lfl ~:~---~- J orZSCZSIOV or ZSC2482 orZSCZ687 AUOIO DRIVE 1 I r ...... • 1701 Schematic Notes 'II Y4 _ GE-IOOOA Itao ".1tc J * IC30I@pIn X602 2SD ••• A((;) .r2SC2411~ AUDIO OUT o :$Yp..p 'HI MAIN 'CB ASSY ceo .,001 "0' IIOK ceo. .011 ,OOY MY I •• _ . ~L.
1702 MODEL IDENTIFICATION BEFORE servicing a 1702 Monitor, please NOTE: Some models are distinguished with the letter "T" next to the manufacturer's serial number. _-----+------ Rating Serial No. I -------------(T) label I L-- Model discrimination point. This designation indicates that a TOSHIBA picture tube and deflection yoke were used. A difference in electrical specifications is required. The connect schematic and parts list is identified 1702 "T".
Monitor parts may be secured locally. JVC part numbers have been provided for your convenience. ONLY Commodore part number (C314-xxx-xx) will be available from Commodore at this time.
Monitor parts may be secured locally. JVC part numbers have been provided for your convenience. ONLY Commodore part numbers (C314xxx-xx) for will available from Commodore at this time.
Monitor parts may be secured locally. JVC part numbers have been provided for your convenience. ONLY Commodore part numbers (C314-xxx-xx) will be available from Commodore at this time. MAIN PCB ASSEMBLY #GE-1003A (Continued) LOCATION DESCRIPTION JVC PART # COM PART #14 DIODES (Continued) D1701 D1702 Zener 1SR124-400 * HZ7B2L Oxide Metal Film, 1000, 1W, ±5% Metal Film, 1.
Monitor parts may be secured locally. JVC part numbers have been provided for your convenience. ONLY Commodore part numbers (C314-xxx-xx) will be available from Commodore at this time. MAIN PCB ASSEMBLY #GE-1003A (Continued) LOCATION C1425 C1426 C1502 C1508 C1523 C1526 C1529 C1530 C1531 C1534 C1535 C1541 C1551 JVC PART # DESCRIPTION Electrolytic, 470 p,F, 35V TF, .
Monitor parts may be secured locally. JVC part numbers have been provided for your convenience. ONLY Commodore part numbers (C314xxx-xx) will be available from Commodore at this time. CONTROL PCB ASSEMBLY #GE-1003A (4/6' LOCATION DESCRIPTION JVC PART # COM PART # VARIABLE RESISTORS R1854 R1860 R1863 R1866 R1869 R1871 R1875 R1877 Cont, 10K Bright, 10K Sub Bright, 4.7K Tint, 10K Color, 10K Volume, 10K V. Hold, 10K H.
Monitor parts may be secured locally. JVC part numbers have been provided for your convenience. ONLY Commodore part number (C314xxx-xx) will be available from Commodore at this time. CRT SOCKET PCB ASSEMBLY #GE-1003A (3/6) LOCATION DESCRIPTION JVC PART # COM PART # TRANSISTORS 01351 01352 01353 2SC2611 2SC2611 2SC2611 DIODES 01351 Silicon RM-2C RESISTORS R1357R1359 R1360R1362 R1378 Oxide Metal Film, 12K ORG029J-123 Composition, 3.
Monitor parts may be secured locally. JVC part numbers have been provided for your convenience. ONLY Commodore part number (C314xxx-xx) will be available from Commodore at this time. REGULATOR PCB ASSEMBLY #GE-1003A (2/6) LOCATION JVC PART # DESCRIPTION COM PART # INTEGRATED CIRCUITS * STR3125 IC1901 DIODES 01504 01901- Bridge Rectifier * 1B4B42 Si * 1S1887A Non-flammable, 2, 7W Metal Film, 4.7, 2W Composition, 6.
1 702 Board Layout wO D i :~~~~9~O~; _~ ~n'" ~~70 ~ 0 ~tr @lJ a~'" ~ ~~ . @ ~: . '" ~ B II!! ;~~6 06 ~n: E U... E [136}l y; u 6 - a ~ GE-I003A 15/61 Ai INPUT ~ Ilil L;i llioR356 oR354 oR3S7 .... P~jJYIRI ! 0il 0 ~ gUn ~ AOOIOO 0 ~ C356 "a - 0"'" Y ~ ~~ I [!] 3 ~~ C351 ==. 0 o 0 0 0 0 0 0 0 0 0 iii R906 -c:::::r =, ~g I 0 0 0 0 0 0 0 0 0 = .. 0 0 0 EO -- 0 GRl.t.
ftS=E~'ER [1 I GE-1003A(5/6) AV INPUT PB ASS' Y (REAR) DC 1 702 Schematic Notes t VOL ATT I J __ !).4V 4r+~~I~'8~V~_ C601 1150 ~r C602 I : 220/16 3'1 VOLTAGE & WAVEFORM NOTATIONS - Voltage readings and waveform measurements were taken with a color video signal injected at the video input terminal. Each variable resistor was set to condition at time of shipment, After adjustments have been made, the figures will vary and the figures should be used for reference only.
1 702T Board Layout ~·Inu ~iU 051 === 0000000000=' -
SPEAKER .0 __~, I ~~_____________________~ GE -I003A1(GE-I005A) (5/6)r r~'~~~~~ CHRO~ Monitor parts may be secured locally. JVC part numbers have been provided for your convenience. ONLY Commodore part number (C314xxx-xx) will be available from Commodore at this time. I I 1702T LOCATION DESCRIPTION S02 JVC PART # COM PART # Picture Tube 1""Ir""""" If rlf---l----- l N~~U "SAFETY COMPONENTS - : "" I""\~,~ ~I riFl J. ~ 5 --- -1 ~~" I I I o»(oqSI S~~' + C602 220/16 IV"!!!:.
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