Williams Joust Usa Upright Instructions Service Manual

							9MORE DIAGNOSTIC MODE TESTSTEST & PROCEDURESVIDEOSEQUENCESREMEDY OR ADJUSTMENTRAM 1BRAM 2B1 Light red screen2 Red screen3 Dark red screenToo-light ortoo dark redor gray bandMagenta band4 Light green screen5 Green screen6 Dark green screenYellow bandCyan band7 Light blue screen8 Blue screenMagenta bandToo-light or too dark blue orgray band4 Light green screenGreen bandDark green bandor gray band5 Green screenLight green bandDark green bandor gray bandCOLOUR RAM TEST(Test 6)Note that a blank sequence or two sequences with the sameshade indicate a faulty 1A flip-flop, 1B RAM or 2B RAMor a failure in the color analogue circuit.  Check voltages onQ1 (green transistor), Q2 (red transistor) and Q3 (bluetransistor).  During the eight full screen color tests, the basevoltage (center Pin) on each transistor should vary between3.8v (brightest color) and 4.4v (no color)(1) CRT sequences through 8colors, 2 seconds each(2) Thick vertical bandindicates color RAM fault.6 Dark green screen-Grey bandCross hatch patternAids you in setting up vertical andhorizontal linearity, convergence andfocus.Red screenGreen screenBlue screenColor BarsAids you in optimizing color purityMONITOR & COLOUR RAM TEST(Test 7)12345678    1 = RED    2 = GREEN    3 = BLUE    4 = WHITE    5 = BLACK    6 = YELLOW    7 = CYAN    8 = MAGENTAColor Bar PatternColor Bars· Double-width· Half-width· Transposed· MissingIf color RAM test 6 indicates no faults,symptoms at left suggest a fault in 1A,1B, 2B or 2C chips. 
						

							10SOUND BOARD DIAGNOSTICSSYMPTOMTEST AND PROCEDURESo  CHECK SOUND SELECT INPUTS(1) Turn power on.(2) Depress DIAGNOSTIC pushbutton on bottom of soundboard.  Sounds may be produced now even though absent indiagnostic mode 4.  If you hear game sounds proceed with this checkbox.  If not go ahead to POWER SUPPLY checkboxbelow.TESTTOOLCONDTION AND REMEDYSound board connector 10P3J3-1 to 6Logic Probe (Game on and intest 4)· PULSING - Proceed.· LOW - check jacks, foils.· STILL LOW - Perform ROM board checkbox below.SR1 DIP resistors R3 to R9VOM - Reading ohms (gameoff)· ALL 4.7K - Proceed.· ANY OPEN - replace SR1.C3 to C9VOM - Reading ohms (gameoff)· ALL OK - Proceed.· ANY SHORTED - replace bad.IC 5-1IC 7-14Logic Probe (Game on and intest 4)· HIGH - Proceed.· LOW - Replace C19 (IC5) or C21 (IC7).· STILL LOW - Replace bad IC.IC5-2, 4, 6, 10, 12, 15IC7-4, 6Logic Probe (Game on and intest 4)· PULSING - Proceed.· LOW - Replace bad chip.IC10-18, 19(PIA)Logic Probe (Game on and intest 4)· PULSING - Proceed.· LIFT C20 - Retest.· PULSING NOW - Replace C20.· STILL LOW - Replace IC6, retest.MISSING SOUNDSNO SOUNDIC10-10 to 17Logic Probe (Game on and intest 4)· PULSING - Proceed.· SOME LOW Replace IC.· ALL LOW - Lift C31, retest.· PULSING NOW - Replace C31.· STILL LOW - Replace ICo  CHECK ROM BOARD OUTPUTS(1) If you hear game sounds, disconnect and reconnect sound board connector 10P3J3.(2) You Should hear one or more game sounds.  If so put the game in DIAGNOSTIC MODE Test 4 and proceed with thischeckbox.  If not go ahead to POWER SUPPLY checkbox below.TESTTOOLCONDTION AND REMEDYROM board connector 2P4J4-3to 6Logic Probe (Game on and intest 4)· PULSING - Repair cable to sound board.· ANY LOW - Replace jack or foil, proceed.0C DIP resistors 2 to 6VOM - Reading ohms (gameoff)· ALL 4.7K - Proceed.· ANY OPEN - replace 0C.C26-39VOM - Reading ohms (gameoff)· ALL OK - Proceed.· ANY SHORTED - replace bad.SOUND WHENDIAGNOSTICPUSHBUTTON PRESSEDBUT NOT IN DIAGNOSTICMODE TEST 4IC10-10 to 15(PIA)Logic Probe (Game on and intest 4)· PULSING - Proceed.· SOME LOW Replace IC.· ALL LOW - Lift C23, retest.· PULSING NOW - Replace C23.· STILL LOW - Replace ICNO SOUNDo  CHECK ON-BOARD POWER SUPPLY(1) With power off test for fuse continuity at F1 and F2.(2) With power on check for +12v unregulated DC at TP1 and pin 5 of IC1.(3) Now check for +5v regulated DC between TP4 and TP3.  If voltages are absent or low turn off game and lift one pin of filtercapacitors C25, C26 and C27.(4) Check each with ohmmeter for possible short circuits.(5) If capacitors are good and unregulated voltages test okay but you’re missing +5v, replace regulator chip IC8.STILL NO SOUNDo  CHECK AUDIO (ANALOUGUE) SECTION(1) Turn power on; turn up volume control.  Momentarily place powered-up AC soldering pencil on final amplifiers input pin(IC1, pin 1 or 10P4, pin 2)  If you hear low hum, audio IC, volume pot and speaker are okay.(2) Repeat test at Q2 emitter.  If you hear hum, analogue section is okay.  Step (1) will also work if you simply touch amplifiersinput pin.  However output level of hum will be much lower than with soldering iron.  DO NOT use a soldering pencil over 40watts.  Cordless models will NOT work here.MISSING SOUNDS;NO SOUNDo  CHECK SOUND ROM 12 AND RELATED CIRCUITRY(1) Is jumper W1 connected?  IT SHOULD BE on all JOUST games, or sound signals from the D/A converter (IC13) will neverarrive at input of impedance-matching transistor Q2.(2) Turn power on.(3) If you have no game sounds but power supply tests show normal voltages and no ripple on +5v, check crystal clock circuit.Using DVM or logic probe, test for pulsing AC across crystal.  If clock signal’s absent replace crystal and associated capacitors.(4) Turn off power.(5) Swap sound ROM (IC12) and microprocessor chip (IC9) with known-good chips.(6) Power up and test Sound Board after each swap by pushing DIAGNOSTIC button. 
						

							11APPENDIX ACMOS RAM Data Test ProtocolThe first sub-test of the CMOS RAMdata is that of the ATTRACT MODEMESSAGE checksum.  If the testdoes not pass, the factory ATTRACTMODE MESSAGE is restored.Next, the game adjustments arechecked and restored to factorysettings if an error is found.  If gameadjustments are found intact, the highscore table is checked for any badentries.  Bad entries are replaced witha score of 4,000 points and noinitials.  If all entries check, the gamereturns to the Game Over Mode.If game adjustments are restored tofactory settings, the AUDITTOTALS are checked.  If 5 or moreaudit digits are other than 0-9 (that ishexadecimal A through F) all audittotals are cleared.  This is followedby a check of the high score table andthe table is reset to factory settings iferrors are found.  Finally, gameadjustments are rechecked and eitherOPEN COIN DOOR or FACTORYSETTINGS RESTORED isdisplayed.  With the former, open thecoin door and turn the game OFF andON and then FACTORY SETTINGSRESTORED will be displayed.Return to game over by depressingthe ADVANCE pushbutton or byturning the game OFF and ON asecond time. “Warning: This equipment generates, uses, and can radiate radio frequency energy and if not
installed and used in accordance with the instructions manual, may cause interference to radiocommunications. As temporarily permitted by regulation it has not been tested for compliancepursuant to Subpart J of Part 15 of FCC Rules, which are designed to provide reasonableprotection against such interference. Operation of this equipment in a residential area is likely tocause interference in which case the user at his own expense will be required to take whatevermeasures may be required to correct the interference.”POWER  ON
ATTRACT MODE
MESSAGE?
RESTORE
FACTORY
MESSAGE
GAME
ADJUSTMENTS?
RESTORE
FACTORY
SETTINGS
AUDITS?
CLEAR
AUDITS
HIGH
SCORE
TABLE?
RESET HIGH
SCORE TABLE
TO FACOTRY
SETTINGS
GAME
ADJUSTMENTS?
OPEN COIN DOOR
DISPLAYED
OPEN COIN
DOOR
POWER OFF
AND ON
FACTORY
SETTINGS
RESTORED
DISPLAYED
POWER ON
AND OFF
HIGH
SCORE
ENTRIES?
BAD ENTRIES
REPLACED WITH
4,000 AND  NO
INITIALS
INITIAL TESTS
INDICATE ALL
SYSTEMS GO
DISPLAYED
1
11
PASS
FAIL
PASS
FAIL
PASS
FAIL
PASS
FAIL
5 OR MORE HEX A-F
PASS
FAIL
PASS
FAIL