Hal Communications DS2000 Customer Maintenance Manual Download Page 38 | Manualshive

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Hal Communications DS2000 Customer Maintenance Manual Download Page 38

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Summary of Contents for DS2000

Page 1: ...ght O 1981 by HAL Communications Corp Urbana lllinois Printed in the United States of America Al l Rights Reserved Contents of this publ ication may not be reproduced in any form without the written p...

Page 2: ...and l z0 tests minimizing the amount of external test equipment required A good 20 000 ohms per volt VOM may be the only piece of test equjp ment you need An oscilloscope is not required by the proced...

Page 3: ...Board 2 5 Reassembly of DS2000 KSR 13 2 4 I O SPECIFICATIONS AND LIMITATIONS I5 TROUBLESHOOTING PROCEDURES FOR THE DSzOOO KSR 17 4 1 lnitial Connector Check 17 l 2 Returning Equ i pment 17 4 3 Using T...

Page 4: ...Force Methods of RF El imination 25 Location of Jumpers Sidetone Vol Pot and C R Rg 30 DS2000 Sidetone Oscillator Component Selection Chart 31 Location of Optional Sidetone Output Circuit Pad rrSrr 3...

Page 5: ...he Z 80 and its ancillary devices is through the bi directional data bus address bus and control signals such as l 0 Read write and Memory Read write Operation of the z 80 central processing unit CPU...

Page 6: ...O LINES LOO P CW KEYING K0s MORSE AF INPUT FlG 1 1 Block diagram of pc board interconnections in DS2000 POWER SUPPLY D 1 r43 PRO CESSO R VID EO BOARD WITH KEYBOARD D 1 139A MR2 OO MORSE AUDIO INTEBFA...

Page 7: ...5 i z OUJ J Zo o e u33 E n o QXxuJo F F aC o Z F 3 o o J Cf o C o u c a E r0 q r0 p o o o o N d o a o N o I I N 5 J j a J o F z O CJ o LLI o E OE LIJ O FF cc E LIJ 2 EUJ J 9 CE UJ J J C c F z o F E J...

Page 8: ...ck and IIT signals The fr equency of the non maskable interrupt is 2 1328 kHz pr oviding an interval of approximateiy 0 47 mS betv een NMls The DS2000 software prograrq is interrupLed each time an N14...

Page 9: ...K cRr2 l TO CRTC t0 R0 ADD BUS DATA BUS EKBSW T0 r 0 sEcTt0N MEMB INTRP FBOM MB2O t MEMW IO RD IOWR r0 R0 FlG 1 3 CPUlMemory section of DS2000 circuitry BUSAK E usRo CLK 2 80 Nmi m DECODE SELECT D E C...

Page 10: ...CI NNECTOR Ao ro WE I t T0 r 0 c0NNEcroR I I TO SPEAKEB FlG 1 4 l 0 section of DS2000 circuitry cJ7 od F o DRIVERS CONTROL SHIFT KEYSWITCH ES DRIVEBS KEYB OA R D MAT R IX BX IOOP D ETECT DECODE TX LOO...

Page 11: ...Access OltA mode there must be some way to remove the Z 80 CPU from the address and data buses when the CRTC requires them to do its job hen the 8350 requires the next Iine of video information for s...

Page 12: ...NTROLLER 50 60 Hz NE BUFFE DELAY 1CHR CHARACTE B G EN EBATO B R EVE RSE VID EO MBIN E CU BSO R DOT CLK BUSEN HOLD JUMPER DISPLAY DATA B R IG HT D IM CO MPOSITE VIDEO OUT r b sotmn FIG 1 5 Block diagra...

Page 13: ...HAL FACTO RY AND SHOU LD NEED NO ADJUSTMENT O N O FF TRANSITION TIMING CW DATA TO DATA BUS DOUBLY BA LAN CED MIXER POT B BAND PASS FILTER fc 9000 Hz PLL TONE DECOD ER 9000 Hz POT F CAR R IER OSCI LLA...

Page 14: ...equencies going through band pass filtering centered at 9000 Hr Band pass filter output is fed to a phase locked looP PLL tone decoder that is designed to detect kHz input signals PLL output is low pa...

Page 15: ...otected work surface Use caution to ensure that none of the interconnecting cables are strained during this operation 2 2 Removal of the MR2000 l lorse Receive Board To remove the MR2000 from the KSR...

Page 16: ...Flc 2 1 Chassis Position for installation removal of MR2000 12...

Page 17: ...order The following are special instructions concerning instal lation of certa i n subassemblies l hen instal I ing the l 1R2000 use caution when plugging the Dlp header into the DIP socket on the log...

Page 18: ......

Page 19: ...m Morse audio input pins I and 2 on audio connector 10 V RMS maximum 0 5 to 1 0 V P P optimum Morse keying outputs pins 7 and 9 on l 0 connector Transistor switches to ground keying positive cathode a...

Page 20: ...T OR ASCII I lI o l 3 lI 4 5 GND 6 KOS 7 CATH 8 GND 9 GRID ODE KE BLOCK INPUT OUTPUT CONNECTOR Y OUT POSITIVE KEY OUT NEGATIVE PTIONAL SIDETONE OUT sEE SECTTON 5 2 ROUND uoto lN l 0 connect ions MORSE...

Page 21: ...irst thing you shoujd do if a problem occurs cabinet see section 2 and verify that all connectors are includes all molex shell connectors and the ribbon cable D t1R2000 is installed Inspect the KSR in...

Page 22: ...J oce az il Eae fib zl L i rEE FF ur rrcE I cc H l _a Fo IJ r s HA d zcrAxcca L a J 3 o cr c o o ta o o o O o o N af I I r cc zat LLI z rr c d o F o uJ r 6 tr Za_ LUO 5 F o zc9 F OC 6o Clr uJ fo ccFC...

Page 23: ...cted to ac power ls the video cable properly connected to the video output connector on the DS2000 and terminated properly proper impedance at the monitor video input connector Are the contrast and br...

Page 24: ...r larger in height than thosa clo er tc the bottom of ihe screen an ad j ustment of the lertical linearity conirol is incl icated lf ihe verLical Iinearity conlrol is moved from the factory setting a...

Page 25: ...output that is centered in the band pass filter The 800 Hz note is chosen because it ma IZIE E audio frequency available from most receivers when a signal is tuned to the center of the receiver i f f...

Page 26: ...ot i e at the negative end of the l0 pF is routed to the speaker through cables connected Check for audio at the foil pads where the lf sidetone audio is present at all points speaker with an alternat...

Page 27: ...to a dummy load may not eliminate all rf reiated problems al though this is an excel lent first step in verifying rf prob 1ems Radiation of rf energy from linear amplifiers antenna tuners coaxial swi...

Page 28: ...RPE N DICULAR nUr lS ___ _ HIGH MU FERRITE TOROID CORE B FROM TRANSMITTER TO HAL EOUIPMENT B Cable arrangements showing ways Use of high mu toroids and rods rf on audio and control lines A B ffiffi A...

Page 29: ...M TO EQUIPMENT AC POWER WIRING IIO VAC OUT IIO VAC IN r I I I I I I I I I I 1l L tnaNsutt CHASSIS t SHIE L DE D ENC LOS U RE TTER GND A B B Simple rf bypass method used in Bru te force ac line filter...

Page 30: ...on the rf energy that is coupled into interconnecting cables Apartment dwel iers may have the most difficulty achieving a good installation since many times an indoor antenna is the only type al Iowe...

Page 31: ...duce the coupling between the outside shield braid of the coaxial cable and the antenna lf there is a moderate Sl iR on the line try adjusting the coaxial cabJe length so that a low impedance high fee...

Page 32: ...r i...

Page 33: ...d SHIFT keys Sidetone frequency is not adjustable in the DS2000 KSR However if the frequency must be changed the values of two resistors and one capacitor may be changed to alter the frequency of the...

Page 34: ...D E E b E trJ o f UJ z OF F u_t o O r I a _l 1 d d o C o o o o E o o c o o _ L 0 o E a o c o o o o J I I a E UJ L I 30...

Page 35: ...HZ RA oHMS RB o HMS c I l 500 6 8 K 27K o 047 6oo 2 2 K 120 K 0 01 700 5 5 K 100 K 0 01 8oo r 2 2 R 18 K 0 047 r 000 8 2 K 58K 0 01 1200 5 8 K 56K 0 01 1400 8 2 K 47K 0 01 As set at factory t t J5g rn...

Page 36: ...5 1 This is the only modification that is required to operate the DS2000 with 50 Hz line frequency 5 4 Modification for 0peration with 69 Character Video Line The 052000 KSR video line can be se lect...

Page 37: ..._tr o o a U L o a o J o I c c o o _o o c o d o o c 9 tg o J I I 1 a I tI k 33...

Page 38: ...c o L o C c c o f o a o I c o o c o o o o c 9 o o o J I I 5 z o_ 3...

Page 39: ...ower Supply Schemaric Diagram 4 1355 39 6 5 MR2000 Audio lnput lnterface A 1354 40 6 6 DS2000 External View of Complete Unit 41 6 7 Cabinet Top Removed From Lower Chassis 42 6 8 Lower Chassis with Top...

Page 40: ...a 44 y f o s r 9 0 ts o lr l 5 4n al o z lrl J A o o 0 N A J r I o 9 t li g E lg 5B lHr r il B t el ffi i P re l tratE o ie0 Nl 50...

Page 41: ...J r r I10 r i j p 5 D V J o 2 H o o o c I I f 6f 12 L i 1 2y z li t e n u I t a Hj i 0 _ffi r6 i 9 iod TgiEE E s i v r 1 r l l T1l ilf r r c E I l3 x d j s JFIA1 0 o F l q I Jr I S tr 14 1A E ll L t...

Page 42: ...a t t t_ I 7 i d l 5 F I l l9 tl T 9 J o t d o M P UJ J r o ul 2 0 o o ot s s l1 E i q Fr E o I i AJ Y qi4Y Y o ln o p tssg i lJ iy i ji g 3 Zli I 38...

Page 43: ...i i o D 5 s l l1l 3 o o o c l I r A 1 o I 7o r r g i d t h I 2 a aI r zd x qei t 4 3 U aazz z l a4 i a D a J 1 t 7 t9 3 IT t i tt49 sZr i v J b od A E T 3rj rt I C i h i vt s u p _t 4l lrr E 4 i fr lr...

Page 44: ...llil ril _n d t 1 c E i a aSl g I lq l x H rkf rrufr li i rL 12 l i tF 3t ot c 1i J 11 8 r1 I s a I F iq 3 A d oo _F t IHI i U I t lH F 1 5 t t 3 e rl ri I r i L1 L a q n rt l B 1H F q o Ll i cl l F t...

Page 45: ...c o o o E o u o 3 o o c C x rrJ o o o N a I o o t z f o ho ri0 4l...

Page 46: ...o _c L o E o q q o o E o I o o C o o I I F o 2...

Page 47: ..._o o o o L o L o o o O n o E o o o g 3 o E o o 3 o J I I o 3...

Page 48: ...t illr 1t e 1r 1t Jl 1 t _g L a o n o o c o o o o qr o o 3 o o o F I I o 4t...

Page 49: ..._a o o o o L 3 o o o 3 q E o o 6 I I o o 5 tt5...

Page 50: ...L o o o c c o o C r0 o 6 _o L o o o O o N t o C o _o o C i I o 9 LL 46...

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