Qume QVT 101, Maintenance Manual

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Page 2: ...artY kind Wlatsoever with respect to the contents hereof and specifically disclaims aflY ill1llied warranties of nerchantibility or fitness for aflY particular purpose Qure Corporation shall not be li...

Page 3: ...to service the QVT 10lm Terminal by quickly isolating a fault and taking cor rective action in a minimum amount of time It is assumed that all service personnel who may use this guide have rudimentary...

Page 4: ...removing and replacing a defected subassembly Section 2 Alignlent procedures for performing any necessary video alignment after replacing a subassembly Section 3 Parts information for identification...

Page 5: ...ard Bottom Cover Keyboard PCB and Coiled Keyboard Cable 2 3 Key Caps 2 6 Monitor Back Cover 2 7 Monitor Bottom Cover 2 9 LOWER MONITOR AREA SUBASSEMBLIES 2 11 Power Log c PCB 2 13 Transformer 2 14 Pow...

Page 6: ...Replacement 2 S Keycap Removal and Replacement 2 6 Monitor Back Cover Removal and Replacement 2 8 Monitor Bottom Cover Removal and Replacement 2 10 Lower Monitor Area 2 12 Power On Off Switch and Fus...

Page 7: ...connectors making good contact Is there a compatibility problem between the terminal and the host TROUBLESHOOTING FLOWCHARTS When using the following troubleshooting flowcharts always begin with Faul...

Page 8: ...S Exit Self Test enter Local mode Press each key on keyboard I Are characters displayed as keys are pressed NO Proceed to Flowchart 3 YES Exit Local mode enter On Line mode Full Duplex mode Install lo...

Page 9: ...fective NO Return Begin Flowchart 1 YES Replace switch refer to Section 2 Continue Doeslfuse fail again at power on NO Return YES Begin Flowchart 1 Replace fuse Disconnect P5 to isolate power transfor...

Page 10: ...eo PCB is defective Continue YES Replace fuse Connect keyboard telephone jack to the Power Logic PCB Power on unit Doeslfuse fail again at power on YES NO Keyboard checks OK Video PCB is shorted Repla...

Page 11: ...gfC PCB NO Power Logic PCB is defective Replace Power Logic PCB refer to Section 2 YES Depress each key on keyboard for a minimum of 2 seconds each and observe for an AC RMS voltage at test point K1 o...

Page 12: ...fully CWo Observe a 300 mVdc voltage chanre between pins 1 and 2 of P7 Does voltage change by approx 300 mVdc NO Brightness control is defective Replace brightness control refer to Section 2 YES Blan...

Page 13: ...tness control fully CW check at junction of R551 and R553 for approx 400 mVac RMS I Is approx 400 mVac RMS present NO Defective power supply circuit Repair YES With a high voltage probe I check the CR...

Page 14: ...zardous voltages are present in the general area of the f1yback transformer lead and the CRT anode cap Exercise caution to avoid electrical shock when performing any video alignment procedure Remember...

Page 15: ...U8 U9 or the Power Logic PCB C Replace U8 U9 UlO or the Power Logic PCB o Replace Ul8 or the Power Logic PCB E Replace UlO and U18 or the Power Logic PCB F Replace U8 U9 and U18 or the Power Logie PCB...

Page 16: ...ttempting subassembly removal or adjustment Always read the removal and replacement instructions carefully before attempting the removal of any subassembly Take special precautions when working with t...

Page 17: ...anode to ground before performi ng any mai ntenance in the upper moni tor area refer to Step 2 of the Video PCB Removal and Replacement procedure The paragraphs below descri be the removal and replace...

Page 18: ...keyboard PCB to the bottom cover However the two screws with tabs located at bottom center of keyboard do not have to be removed just loosen each tab screw and move holddown tab to one side See Figure...

Page 19: ...Vl N c I co Vl Vl T1 3 co r SCREW SCREW SCREW SCREW c T1 3 0 r z I Q 0 c c T1 0 N r I T1 3 T1 z I c r 0 a I 0 n 0 tD 0 I tD SCREW SCREW SCREW SCREW...

Page 20: ...ND REPLACEMENT It 1 I II tt j 11 A a W o U U o I 0 o a C 0 a w o ti t Ii _ C 0 0 0 a a 0 0 a Ww Oa a 0 0 O Z W w W w alal 0 O U _alal alalW WUt j O Z a UwU WUZ cn 0 Z U Figure 2 2 Keyboard PCB Removal...

Page 21: ...Removal and Replacement procedure Key Caps REMOVAL A key cap can be removed by gri ppi ng it between index fi nger and thumb and pulling up or more preferably with a Key Cap Puller Tool Qume Part Num...

Page 22: ...o Step 2 of the Vi deo PCB Removal and Replacement procedure Take precaution when working in the general area of the CRT Do not scratch or strike the CRT or subject it to unusual pressure The CRT cont...

Page 23: ...SUBASSEMBLY REMOVAL AND REPLACEMENT 2 8 f I I 1 L _ _ BACK COVER TWO PHILLIPS HEAD SCREWS SECURE MONITOR BACK COVER Figure 2 4 Monitor Back Cover Raoval and Replacellent...

Page 24: ...ea power OFF the terminal and disconnect the power cord 1 Remove the knob from the brightness potentiometer 2 Lay the moni tor on its side and loosen the four recessed screws at the corners These scre...

Page 25: ...SUBASSEMBLY REMOVAL AND REPLACEMENT KNOB BOTTOM COVER 222 B 3 Figure 2 5 Monitor BottoM Cover Removal and ReplaCeMent 2 10...

Page 26: ...MENT LOWER MONITOR AREA SUBASSEMBLIES The Lower Monitor Area contains the following subassemblies See Figure 2 6 Power Logic PCB Power On Off Switch Fuse Holder RAM Backup Battery Brightness Control L...

Page 27: ...SUBASSEMBLY REMOVAL AND REPLACEMENT FUSE RAM BACK UP BATTERY 2 12 POWER TRANSFORMER P7 POWER LOGIC PCB P19 Figure 2 6 lower Monitor Area BRIGHTNESS CONTROL P5 KEYBOARD CABLE JACK...

Page 28: ...t procedure 2 Disconnect the following connectors from the Power Logic PCB See Figure 2 6 P5 Transformer P19 Video PCB P7 Brightness potentiometer 3 Remove the ground strap from the keyboard input jac...

Page 29: ...itor Bottom Cover Removal and Replacement procedure 2 Disconnect connector P5 from the Power Logic PCB assembly See Figure 2 7 3 Remove the two screws that secure the Filter PCB See Figure 2 7 4 Remov...

Page 30: ...he bottom cover See Figure 2 7 3 Remove the filter PCB it is not necessary to unsolder its four connecting 1eads 4 Note the arrangement of the four leads on the power switch Unsolder these leads and r...

Page 31: ...ttom cover Remove the fuse holder REPLACEMENT To replace fuse holder perform removal instructions in reverse order POWER SWITCH MOUNTING BRACKET i FILTER PCB r 1 TJ TO POWER r f LKI TRANSFORMER t _ d...

Page 32: ...sconnect the power cord The battery is easily removed and replaced by sliding it in and out of its retainer clip on the Power Logic PCB see Figure 2 8 As a reference note the status 1ine set up confi...

Page 33: ...SUBASSEMBLY REMOVAL AND REPLACEMENT BATTERY RETAINER CLIP BATTERY LOGIC PCB 69 A 02 Figure 2 8 Battery Re oval and Replacement 2 18...

Page 34: ...itor Bottom Cover Removal and Replacement procedure 2 Oi sconnect the bri ghtness control connector P7l from the Power Logic PCB See Figure 2 6 3 Remove the two screws that secure the bri ghtness cont...

Page 35: ...SUBASSEMBLY REMOVAL AND REPLACEMENT 2 20 P7 WASHE SCREW SCREW T MOUNTING BRACKET I I BRIGHTNESS POTENTIOMETER Figure 2 9 Brightness Potentia eter Re oval and Replace ent...

Page 36: ...EMENT UPPER MONITOR AREA SUBASSEMBLIES The Upper Monitor Area contains the following subassemblies See Figure 2 10 Video PCB CRT VIDEO PCB FLYBACK TRANSFORMER FLYBACK TRANSFORMER LEAD Figure 2 10 Uppe...

Page 37: ...k Cover Removal and Replacement procedure 2 Discharge the CRT high voltage circuit and remove the flyback transformer anode cap as outlined under Discharging the CRT High Voltage Circuit 1I 3 Disconne...

Page 38: ...ap and the CRT to discharge the anode 2 After discharging the CRT circuit remove the jumper cable from the screwdriver and connect it to the CRT anode metal cap keep the other end of the jumper connec...

Page 39: ...hat secure the CRT against the front bezel 9 Remove the grounding spring from the CRT 8 00 NOT 11ft the CRT by its neck or by the yoke assembly Carefully lift the CRT out and place it face down on a s...

Page 40: ...ition TOOLS AND EQUIPMENT REQUIRED The following tools are required to perform video alignment of the QVT 101 Terminal Phillips Screwdriver No 2 Small Flat Blade 1 8 inch Non metallic Screwdriver Mult...

Page 41: ...H Test Pattern displayed The terminal has a built in test pattern that displays a full screen of H characters and identifies the firmware revision level To display the H test pattern simult aneously...

Page 42: ...HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH...

Page 43: ...Fi gure 3 2 Each al ignment procedure is described below P4 3 4 V LIN VR502 LEGEND BRIGHT VR151 FOCUS VR152 VR501 Vertical Display Height VR502 Vertical Linearity VR151 Brightness VR152 Focus L10l Hor...

Page 44: ...eful to minimize parallactic distortion i e move the position of head and eyes so that each reading is taken at a 90 degree angle to the screen straight on 2b Using a Metric Ruler The distance between...

Page 45: ...e the position of head and eyes so that each reading is taken at a 90 degree angle to the screen straight on 2b Using a Metric Ruler The distance between the inner edge of the front bezel at the top a...

Page 46: ...ttern Ctrl Shift Setup Zero 2 Measure character height at five locations in the test pattern near each corner and in the center If a Character Alignment Template Qume Part Number 10351 02 is used prop...

Page 47: ...Pattern are parallel to and visible between the parallel maximum and minimum lines on the Display Alignment Template The raster pos tion may be changed by rotating the centering rings on the back end...

Page 48: ...y break the centering rings on the yoke of the CRT loose and rotate the rings as required to center the display NOTE Do not loosen the deflection yoke clamp the yoke posi ti on has been fixed at the f...

Page 49: ...ARTS This section summarizes replacement parts and recommended spares for the QVT 101 Terminal Stylized exploded view diagrams are provided to assist in identifying and locating parts in the QVT 101 T...

Page 50: ...PARTS REPLACEMENT PARTS 15 16 18 FIGURE 4 1a QVT IOI UPPER MONITOR AREA 4 3 S ___oii5_ _iiii iliiiiiii _i1iPilil_______...

Page 51: ...ble separately 6 10005 Screw M4 x 0 7 x 10 7 10011 Qume Logo 8 301208 01 Screw M4 x 0 7 x 9 11 10314 Screw M4 x 0 7 x 16 14 301619 01 Rating Name Plate 115V 301620 01 Rating Name Plate 230V 15 10010 0...

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Page 53: ...nly not available separately Slide Ring Lower Cabinet Top Brightness Control Knob Screw Round Head M3 TPA x10 Screw M3 x 0 5 x 10 Screw M3 x 0 5 x 6 Screw TPP 3 x 8 Power Logic PCB Assembly RS 232 C w...

Page 54: ...31 01 Display Module Bottom Cover w o name plate 58 10063 Equipment Foot Cushion 59 10064 Cushion Washer 60 10066 Screw M4 x 0 7 x 14 61 10065 Screw Flat Head M3 TPA x 10 63 301633 01 Power Cord USA D...

Page 55: ...476 01 301048 01 301048 02 Keyboard Not Illustrated 301220 01 84813 110 10244 DESCRIPTION Nylon Spacer 14mm long Current Loop PCB Assembly option RS 422 A PCB Assembly option Keyboard Assembly USA Dom...

Page 56: ...II il PARTS REPLACEMENT PARTS 90 Pl 103 FIGURE 4 2 QVT 101 PWR LOGIC PCB 4 13...

Page 57: ...2 QYT IOl Power Logic PCB Parts PART NUMBER 301281 01 301658 01 10023 301665 01 301666 01 DESCRIPTION Male Connector PS IOPE D4T1 PN1 Screw M3 x 0 5 12P NI Nut M3 x B5 5 x H2 4 NI Shield Wall Cover Ho...

Page 58: ...PCB Assembly 20 150 RS 232 C w keyboard connector 301048 01 Current Loop PCB Assembly option 20 150 301048 02 RS 422 A PCB Assembly option 20 150 301484 01 Brightness Control Assembly w wir1ng 10 30...

Page 59: ...he QVT IOl Terminal are provided for reference QVT IOl Functional Block Diagram QVT IOl Interconnect Diagram QVT IOl Keyboard Schematic Diagram QVT IOl Video PCB Schematic Diagram QVT IOl Power Logic...

Page 60: ...LLER I If I CHARACTER VIDEO HIGH VOLATILE GENERAT R SIGNAL VOLTAGE RAM CIRCUITRY CIRCUITRY T BATTERY J TC 5514 VIDEO VIDEO NON Z 80 1 fSVfIT 0 TRANSFORMER VOLATILE CTC CONTROL V SYNC HORIZONTAL EMI FI...

Page 61: ...DEO PCB 6H H P4 1 2 P3 2 1 1 f HORIZONlAl VERTICAl B O N Q DEFlHIION YOKE REO W111TE BLACK Plll J KEYBOARD ljl a II FI PCB 5 WIRH r J t WHITE HSJ r BLACK BLACK 11 0 TRANS FORH R L U I jSl rfl POWER on...

Page 62: ...X ARE VT IOO COMPATIBLE 5 W310 NOT INSTALLED IV 0101 1114148 f __ z 1 0 vss Pl1 16 P J J6 J3 lO RPlOI U302 8048 8748 llOI 2SInH OlOI 1001 OQ6 0 25V IV R1I4 56 Rl06 UK Rl12 560 __ 1 RllQ lK U301 OJOI h...

Page 63: ...RS09 11K 0502 UML8 nf L5 I OIB i iu I 106 1 i flO 011Jl LOQV 1 QIOI ONll BULOS 1115188 ri 8 1214 25V U02 WlrJl i7 5 6 1 6 l6UH 7 250882 liS I RSIl R51L L10 0 6 2101 SOl 150014 I6V HS l t ng ll 508 QOl...

Page 64: ...BY PREFIXING NUMBER WITH 14 EX 01 7404 rn NORHAl OPliON 0 0 W2 Wl OTR W8 W7 5JCHARAClER SET SELECTIONS W3 SElECT U S HARA lER SET WI SElECT GH CIIARA lER SET W5 SHEer U K IlARAClER SET W6 SELECT F R H...

Page 65: ...D DIAGRA lS OIZ SIR OIl HI14B U44 IV 9 1 lOOil 41 2 V BIOII 12V 18 110U IIV DI II 1 1 StR 10 1 12 IOUH IV D Vl3 lOV I110VI CD 4S VA PIS 110QU 360 16V 1J4W FIGURE 5 5 OVT 101 PWR LOGIC PCB SCHHIATIC sh...

Page 66: ...l fClK 5V i I R4J 600 0 fl ISH 4 8 1P r t Om lK ISH6 ClK __ __ I____ 4 1 4 o r1lh QD 11 I _ ilO 1511 5 I CIRCUITS AND DIAGRAMS 11 J A LS161 nr lK 15114 5 7 I Ul T 1P lS04 J CARRY S _I ________ 1j9 L r...

Page 67: ...h 2 1H 1 LO 2 IR NE U6 07 YS H Le8 L 04 r l1 06 DlSr MI rOhK 1 5f5 fL r OS URWI 19 R9 OliO U OUI S 2K J RAllS 1 04 DISC 03 Ai 3 tv L III J l 01 RM 7 O I IHONoJ S 1 _ _ l III RAU 38 LJl v T lJl DO V IS...

Page 68: ...7 1j If U I 48 SEl li T s ZIA IV 4 AHB I 18 5 l 7Y 7 All9 U14 18 lS157 9 l AHIO II 3 y I 36 44 4V 17 AH I 48 SEl G l s I II I VI6 lollS J 2 H I AlO Ve ijf AH 9 AHIO II AS 0711 06 6 AM6 I A7 05 115 AH...

Page 69: ...AS 00 A 11 VOO 2l 06 Q6 IS I A4 O l I SIf 6 ITil 11 B RJI lOO ISIH I RAI I RAO 1 31 O f10L i 7 1 I I S0 1 II ttt Z 9 tti I ll u lli 6 SOB I iil9 1 JJii IT IlIllJ 5 08 b l k4 I I 5 u ol _1 L V J L t t...

Page 70: ...15118 I OIRl 1 l L 06 1511 I 1511 I V 368 1 1 011511 I 1511 I 00 1511 I 01 ISIl f Ol ISII 0 ISH I 07 ISII V lAI H _ 4_______ 11 I 4 ___2 llIII 4 I06 f___ IlID U20 LS174 OIn I V Al6 1K HZ l c u KIRQ 15...

Page 71: ...RS I llOP i lSC 19K V l l OP 4 JK 1 1 1 tV sv l 4 I f1lg 1 1 UJ B Il r N_ 5V UI lllS O O J J 1 ____ 1 1 1 g 148 r r VOTR ISH I rO p 2 l R J S US 8 ISH4I YlAl H JIClK 74 ii 01 l I I j I 9 1 88 1 1jJp S...

Page 72: ...l N j CIRCUITS AND DIAGRAMS 1c604 l 2200 Pf 400VAC N C603 2200PF 400VAC Figure 5 6 QVT 10l Filter PCB Schematic Diagram 5 27...

Page 73: ...e information you expect and require 3 Is the document clearly written and to the proper level Please note any areas where the wording is difficult to understand 4 Is the i nformati on complete and or...

Page 74: ...________________________________________________ Fold Here ________________________________________________ Qume Corporation 2350 Qume Drive San Jose CA 95131 Attn Terminals Division Technical Publica...