CHAPTER 5 TROUBLESHOOTING
Contents
1. 5 41 REV A Turn power on and press RESET switch Press CAPS LOCK key once Are all LEDs off Are all LEDs off Press NUM key with SHIFT key held down Make sure that resis tance between key board connector pin 21 GND and each LED cathode is ap proximately 1 kohms Also check that re spective resistances between pins 18 19 and 20 and anodes of three LEDs are O ohm Does only middle LED come on Press NUM key once Were all tests passed Does only bottom LED come on Press CAPS LOCK key once Does only top LED come on 5 42 REV A 5 4 4 Repairing The Microcassette Tape Drive Unit Before repairing the microcassette tape drive unit check the following 1 Check the read write and pinch roller for dirts 2 Exchange the microcassette tape for known good one and test to make sure malfunction is not due to a damaged tape 3 Make sure that the lead wires from the mechanical section are perfectly soldered 4 Examine the error message on the LCD panel to find whether the trouble is a directory related problem Tapes written by other computers may contain no directory and cannot be read by this computer Problems 1 and 2 above are interrelated so that both the checks should be performed at the same time 5 43 Fi Start Is problem a reel rotation failure Is problem head load unload fai2. Check output level at pin 6 of IC2 Measure capstan re sistance ls that level low or are pulses of approximately 0 1V observed Is capstan resistance O ohm N Replace IC2 Replace trnsistor Q1 Was trouble fixed Was problem resolved Replace capstan mo tor 5 45 REV A Insert torque check cassette tape and check torque while performing PLAY operation Does reel fail to stor rotating Does reel rotate at different speeds y PLAY drive while ob serving Is torque between 5g and 11g inclusive Measure base voltage inclusive of transistor Q2 Does N read write head move i Is Q2 base N Replace driving belt voltage at low level Y Possibly no reel rota tion failure Was Replace Q2 problem resolved Replace transistor Q5 Was problem resolved Do C shaft and N pinch roller remain Replace microcassette in contact EN j A scam A Switch fotationally HFM Y positioned as shown N at right HP switch contacts are Unload read write Read HP switch head by breaking or Y power off Disassemble and Check reel for proper check P lever assem rotation during PLAY bly for foreign matter and rewind or fast for Does in sliding area ward operation read write head N 2 retract Can
3. Possibly no clock sig nai related trouble 5 25 Was repeat key typed in Replace sub CPU 7508 Check whether DIP switch SW4 is cor rectly set Is SW4 correctly set Replace IC 1E Was trouble fixed Replace sub CPU 7508 Reset SW4 Type all keys Did 8 or more keys fail to be typed in Could all keys be successfully N typed in Check outputs of pins 10 through 13 with one malfunctioning key held down Y Did any Y character change Are pulses observed at all pins Replace sub CPU Y 7508 Check outputs of IC 1E pins 1 through 11 with above key held down Was trouble Y fixed Are pulses observed at all pins Replace IC 1E Probably an imperfect contact at connector CN4 5 26 REV A Are pins 1 and 2 of IC 12D high Replace IC 4C N Are N both low ow Replace IC 12D Check pins 8 and 14 Check signals of IC potentials of IC 12D 12D pins 15 and 16 Are these potentials 8V Is pin 4 level of IC 12D high Check signals of IC 3E Replace IC 9B pins 9 and 11 Were pulses observed at pin 11 Replace IC 2C Was trouble fixed Was trouble fixed Is DTR level high N Was N trouble fixed Replace transistor Q14 GO TO N 8 2 Can data be prop
4. and 72 of SED1130 Y1 Are all voltages different Measure maximum voltage between pins 66 and 74 of SED1320 as sliding view angle variable re sistor VR1 Measure resistances of resistors R1 through R3 Are those resistances correct Is absolute voltage approximately 20V Possibly a short cir cuit within LCD driver X1 to X8 or Y1 Check variable resis tance range of varia ble resistor VR1 Can VR1 vary from 1 ohm to 5 kohms N Replace VR1 Possibly a MAPLE REV A Check the output signal line of SET 1120 which has relation with illegal display function Disassemble LCD panel Examine as sembly of board Ze bra and panel for any problem and check for dirt Clean dirt and or readjust as sembly if necessary Disassemble LCD panel Examine as sembly of board Ze bra and panel for any problem and check for dirt Clean dirt and or readjust as sembly if necessary Is there pulsing output Was trouble fixed Was trouble fixed Replace SED1130 Was trouble fixed Replace SED1120s to left of that for missing column Examine positions and number of rows and columns which are not displayed Was trouble fixed Are 32 or more columns missing Check continuity of FPC cable signal lines betw
5. contacts with that key Rarceircuit short circuit not depressed Substitute a known good key board and retest Is insulation resistance inifinite Was trouble fixed Does new keyboard properly function Possibly a KRTN line short circuit Check insulation between connector pin 21 or 22 and KRTN lines O through 7 Is insulation resistance infinite Possibly a trouble on MAPLE board Follow check out procedures again to isolate faulty unit 5 40 REV A All keys cannot be typed in Examine continuity of FPC cable signal lines including connector contacts Was any problem found Can some keys be typed in Resolve as required Are there more than one keys that cannot be typed in Check KSC and KRTN lines for those keys for discontinuity Check KSC and KRTN lines for that key for Is any short circuit with SW4 correctly another signal Do those keys set share any particular KSC or KRTN line s Was any problem found Check continuity of that line Measure line resistance with diodes in forward direction Is there continuity Check the diodes on that line for open cir cuit Are all diodes normal Do you pass this route for second time Press RESET switch once Replace bad diode
6. we BUZZER CHECK LCD CHECK MCMT CHECK 7 KEY BOARD CHECK 6 DIP SW READ CHECK ANALOG INPUT CHECK Ea BARCODE CHECK CLOCK CHECK 5 2 1 Repairing Tools Table 5 2 lists necessary repair tools which are available from EPSON Table 5 2 Repaired Repair Tools ee 1 TeetegemaoM o 2 R8 282Cinterfaceminiwrapping connector t 3 _ Serial intertace miniwrepping connector Jt EE Kid Er pe 3 Low resolution barcode reader The wrapping connector internal pin connections and the external power supply set up etc are illustrated in Fig 5 1 5 2 REV A Wrapping connector pin arrangement Internal pin connections Serial interface RS 232C interface e A 465 6 7 5 3 263 Dis 3 2 1 4258 E EET D IST IISI LON TE EERS PN 1 RS 232C interface mini wrapping connector DC regulator Serial interface mini wrapping connector Micro cassette tape Fig 5 1 Set up for Repair 5 2 2 Installing the Test Program ROM To install the test program ROM in the ROM capsule of the computer perform the following steps Step 1 Reset the POWER switch OFF Step 2 Remove the ROM capsule cover from the bottom panel Step 3 When two ROMs are already installed in the capsule remove either one by alternately lif ting up on the tabs at both ends of
7. 5 7 AUTO and MANUAL Mode Selection Menu 5 2 4 Selecting a Test Mode In response to the menu in Fig 5 7 key in 1 or 2 respectively to select the AUTO or MA NUAL test mode AUTO Mode When the AUTO mode is selected 71 is keyed in the prompt of Fig 5 8 should appear Spe cify a number of test cycles to be run by responding with a number from 1 to 99 RAM buzzer R 232C interface serial interface LCD unit microcassette tape drive and DIP switch tests make up one test cycle When the AUTO mode is selected this cycle is repeated according to the number of times specified in response to the prompt CHELE GEOUNT 7 Fig 5 8 Prompt for Number of Test Cycles MANUAL Mode wee BUZZER Fig 5 9 Menu for an Individual Test p Select a test by keying in the number preceding the test When the test is completed the dis play stops To repeat the test again press the spacebar otherwise press the RETURN key To stop the test after the keyboard check has been selected key in Break If any error message appears refer to section 5 2 6 5 2 5 Test Run Procedure and Display Information This section describes the procedure for running the individual tests and display information given by them MEMORY amp VeRAM CHE Fig 5 10 RAM Check Test Information Message 5 5 REV A 1 RAM Check The information message displayed in Fig 5 11 appears The RAM and V RAM check tests are perform
8. Is reflector plate good Was problem resolved Replace reflector plate microcassette tape drive mechanism Replace diode D7 Replace tape and try another test If micro cassette tape drive mechanism Replace microcassette tape drive unit cover plate Can EJECT button switch be moved up and down Was problem resolved Was problem resolved Read write head is not unloaded Press INITIAL RESET switch Possibly an EJECT mecanism problem 5 50 REV A How to adjust the HP switch Before mounted After mounted 1 Nominal separation approximately twice the fixed spring plate thick The fixed spring plate must ness 0 35 rest on the cam face 0 1 Unit mm Movable spring plate Fixed spring plate i x v2 a Unit mm a The separator must rest on the protrusion face Must be rectangular How to adjust the PE switch 1 Mounting position l Separator The separator must rest on the base plate ol the separator is inclined rest it flat on the base plate p the contact plate is bent stretch it straight 5 51 REV A 2 Inspection a When a MIN cassette tape is inserted Unit mm The separator must rest on the base plate and there 1 1 must be a separation of 0 2 or more between the G lever and the switch contact plate approximately O 12 EG twice the switch contact plate
9. REV A 2 RAM error messages Fig 5 31 Fig 5 32 D RAM compare error The RAM test was attempted on a program area including OS TPA and RAM files where no read write test is allowed Fig 5 33 V RAM compare error Written and read back data did not agree 3 RS 232C and Serial Interface error messages Fig 5 34 RS 232C transmission reception failure DIR gt DSR RTS gt CTS gt CD TXD gt RXD Fig 5 35 Fig 5 36 An RS 232C error code XX 08 Parity error 10 Overrun error 20 Framing error Fig 5 37 REV A 4 Microcassette tape drive error messages MEHT INITIAL I Fig 5 38 MERT WENE Fig 5 39 Fig 5 40 Fig 5 41 Fig 5 42 Read write error possibly an abnormal tape feed speed or improper read write pulse width Fig 5 43 Fig 5 44 Fig 5 45 Read failure s REV A 5 Keyboard error message Fig 5 46 Key entry code mismatch a key code other than the specified one was input Up to five key entry retrials are allowed 6 Barcode error message Fig 5 47 Barcode pattern read failure Unit Level Troubleshooting When trouble shooting a faulty unit first find the entry routine for that unit from the entry table In such a case where there are more than one symptom is observed and symptoms vary during the course of troubleshooting make it a practice to enter the troubleshooting procedures accor ding to the s
10. Before repairing the keyboard perform the following checkes 1 Visually check the keyboard circuit board for any damage 2 Visually check the keyboard information cable connectors for any damage 3 Visually check the keyboard s internal components such as the circuit board FPC pattern and switches for any foreign matter such as water drops 4 Visually check the circuit board for any FPC pattern separation If damaged components which cannot be repaired are found in steps 1 or 2 replace the keyboard If any foreign matter was found in check 3 clean and dry the components at the normal temperature After components are dry test the keyboard functions again If a problem still exists replace the keyboard Even if the trouble disappears it is possible that it may reoccur at another time due to oxidation of the circuit board patterns If this occurs the keyboard may have to be replaced Printed circuit pattern separations may be fixed by a combination of a hot press and adhesive If unrepairable replace the unit 5 37 REV A KEYBOARD UNIT REPAIR ENTRY TABLE Was repeat key pressed Does any key catch or fail to operate smoothly Type in all data keys and examine dis played characters Does any key character sometimes drop Are all display character positions on LCD panel filled with data Y oS Do all displayed characters correctly match with typed in one
11. ICs according to the error bit Was trouble fixed Bit O 7D Bit 1 4D Bit 2 GE Bit 3 SE Bit 4 6D Bit 5 4E Bit 6 7E Bit 7 5D Was trouble fixed Replace SED1320 7C Replace gate array GAH40D 5 29 Replace slave CPU 6303 13D Was trouble fixed Measure pins 1 and 15 voltage of connec tor CN3 Are both 5V Check transistors Q27 Q11 and Q1 and replace any defective ones Was trouble fixed Replace IC 13E 5 30 REV A REV A 5 4 2 Repairing The LCD Unit E Before repairing the LCD unit check the following 1 Check the LCD panel surface for damage 2 Check for any shade on the LCD panel when power is off 3 Check the LCD board for any damage If a defect is found during the above checks the LCD unit cannot be repaired Replace the unit When replacing a flat package IC follow the procedure below 1 Remove the solder from the IC terminal leads with a Solderwick 2 Lightly push the IC up with a precision screw driver Do not force the IC otherwise the printed circuit pattern may come off the board and the repair may become impossible 3 Remove the IC and remove the reamining solder from the pattern with the solder wick ay 4 Bend the new IC terminal leads so that they fit to the pattern holes The terminal leads are bent downward when the IC is mounted on the head of the board and
12. component in the unit according to the appro priate unit flowchart or the trouble table Step 1 Step 2 Check out Unit repair procedure flowchart Repair by unit Repair at com replacement ponent level Note 1 All checks indicated on the flowchart must be made Should any unit or component be replaced disregarding any check the newly installed one might be damaged Note 2 Whenever you are lost in the repair procedure return to the entry and restart the procedure Note 3 When no exit is found during a diagnostic procedure e g the test process has resul ted in repeating a diagnostic loop proceed with the repair according to the trouble ta ble 5 2 Test Program A test program is supplied stored in an E PROM with carrier which can be installed in the com puter ROM capsule The test program provides tests for the ten functions listed in Table 5 1 It al lows either one of the following two execution modes AUTO Modo In this mode the program automatically performs a six test cycle If desired the cycle may be repeated up to 99 times The number of cycles may be selected after loading the program This mode is suitable for an aging test after repair or a test on a problem of very low reproducibility 5 1 _ REV A MANUAL Mode The manual mode allows the user to select any one test from those listed in Table 5 1 and is an aid to component level troubleshooting Table 5 1 Functions Tested by the Test Program e rear
13. thickness which is 0 12 0 2 lever b When a rug bent cassette tape is inserted Unit mm 0 3 0 5 The separation between the separator and base plate must be from 0 3 to 0 5 approximately half or one third of the separator thickness 5 52 REV A
14. upward when mounted on the tail 5 Resolder the new IC terminal leads 6 Remove the flux from the soldered area 5 31 om REV A LCD UNIT REPAIR ENTRY TABLE Is something displayed on LCD panel Nothing is displayed Is any row of dots missing Is any column of dots missing Is any character missing or incorrectly printed Is any ghost observed Are any light and shade observed Is view angle variable resistor improperly adjusted Visually check computer If any Fas ns ee Ee dots problem is found take 33 65 97 291161 193 225241 27 3305337 36940 lS ELS 1S 51 IS IS 2SS 32 64 96 128 160H92 224 2401272 304 336 368 pa ots x1 x2 x3 x4 x5 x6 x7 x8 x1 x2 x3 x4 x5 x6 x7 x8 proper action If no sne 1130 problem is found run test program to find any malfunction 5 32 REV A Adjust view angle var iable resistor as view ing LCD panel Did something appear Was trouble fixed Replace SED1 130 in faulty LCD unit Check continuity bet ween FPC cable end and soldering Was that check found good Replace FPC cable Possibly no trouble in LCD unit Check con nectors for any imper fect contacts and then replace LCD unit Was trouble fixed board problem 5 33 Measure relative vol tages from 5V of pins 66 67 68 71
15. 400201 according to the instructions in section 5 1 The program displays the connected voltage at an accuracy of 0 02V Step 2 When a DC voltage regulator is used compare the displayed value with the reading If a dry cell battery is used measure and compare its voltage 9 Barcode Check The following is displayed Fig 5 27 Barcode Check Test Prompt Step 1 Read the barcode pattern using a reader If the pattern and read data agree OK appears on the LCD panel 10 Clock Check The following prompt appears Fig 5 28 Time Setting Prompt Step 1 If you would like to seft the time respond with Y to this prompt otherwise key in NT When Y is keyed in above the time setting guide message is displayed Fig 5 29 Time Setting Guide Message Step 2 Key in the date and time as follows year month day week day hour minute and second The set time should be updated every one second REV A 5 2 6 Test Program Messages The test program displays a message on the LCD panel when it terminates normally terminates When any malfunction is found a diagnostic code indicates the problem area Major error messages are explained in the following 1 Return codes from slave CPU 6303 The slave CPU operation being performed when an error occurs is indicated on the LCD panel as a one byte return code as shown in Fig 5 30 Table 5 4 lists all the available return codes and summarizes t
16. EM INITIALIZE ENTER DATE TIME YYMMDDhhmmss 000000000000 Press INITIAL RESET switch Adjust VIEW ANGLE variable register Did any information appear on LCD panel Did any information appear on LCD panel Is displayed information message CHANGE BATTERY Is displayed information the same as table 1 Do you pass here for second time Did displayed information disappear once Can numeric keys 1 to 9 be entered Did install test pro gram menu appear Read test program Did test program menu appear Y Select MANUAL mode and run all tests RAM Check error Y BUZZER Check error RS Serial Check error LCD Check error MCMT Check error 5 16 REV A DIP SW Read Check error Y Keyboard Check error Analog Input 7 Check error Barcode T Check error Clock Check error Observe fault pheno menon again before determining that com puter really has a trou ble Then isolate faul ty unit by replacing LCD unit MAPLE bo ard and Microcasset te tape drive in this or der REV A Did a light and shade pattern appear on CD panel Replace LCD unit N Charge main battery using ac adaptor Press INITIAL RESET switch and then turn POWER switch ON Do you pass here for second time Do you pass
17. REV A CHAPTER 5 TROUBLESHOOTING 5 1 An Introduction to Troubleshooting ee ee ee ee ee ee rreren 5 1 6 2 TestProoiali ss ED GES IE SE ES AD Past irae tule EDS Covet 5 1 5 3 Check out Procedure ese ee ee ee ee ee ee ee ee ee ee ee ee ee ee 5 15 5 4 Unit Troubleshooting eie sesse ee ee ee ee ee ee nanana aaora naan 5 19 REV A 5 1 An Introduction to Troubleshooting Troubleshooting is usually to easy vaned symptoms appear depending on points of failure This section describes two procedures which may allow easier troubleshooting and subsequent repair 1 Check out procedure Objective To guide the user through a problem isolation process when symptoms do not indi cate a specific component malfunction Fault isolation level Repair by unit replacement repair can be accomplished with a basic know ledge of computer hardware 2 Unit repair flowchart Objective To guide the user through a component level repair process Allow a component level repair of an individual faulty unit Fault isolation level Component level Requires an advanced knowledge of computer hardwa re engineering and electronics General troubleshooting procedure First isolate and replace the faulty unit according to the check out procedure faulty each time a unit is replaced to make sure the new unit is not faulty This process will prevent confusion with a problem caused by poor connector contacts Second isolate and replace the faulty
18. cassette Was problem re Y tape be smoothl removed solved Y Do you pass this route for second time Y Possibly no head load unload failure 5 46 REV A Drive HP motor and check HP switch for proper make and break Check IC5 pins 5 and 6 Replace IC5 Are out put levels opposite high low or low high Was problem resol ved Does HP switch operate normally Replace HP switch Was problem resol ved Replace capstan mo tor Measure resistance of Was plebiom resol HP motor winding ved Is that resistance approxima tely 7 ohms Readjust engagement between C shaft and reel gear Check zener diode ZD1 Was problem resol ved Does Replace HP motor ZD1 properly work Replace ZD1 Was problem resol ved Possibly a reel failure Replace microcassette tape drive mechanism Was problem resol ved 5 47 pa Check signals of IC5 Are signal ping through 111 levels of pins 8 and 9 opposite those of pins 10 and 112 Are pulses observed at all pins Replace IC5 Do AC pulses appear at pin 11 EE Check output of ic3 pin 1 Replace IC3 Is signal output at pin 1 Was trouble fixed Measure resistance of read write head wind ing GOTO Stard Is read write windin
19. cessive heat 5 21 REV A Check levels of pins 2 and 15 of IC 12D Is pin 15 at low level Measure output vol tages at pins 8 and 14 of IC 12D while oper ating RS 232C inter face Replace IC 12D Is pin 15 at low level Check transistors Q7 Q8 014 017 018 Q21 and Q31 and re place defective one Are output voltages 8V Replace IC 4C GAH40M Measure output vol tage at pin 28 of IC 9E while reading ROM capsule Check level of IC 13E pin 31 Replace IC 13E Is output voltage 5V Was trouble fixed Turn POWER switch OFF and make sure Check transistors Replace slave CPU Q11 027 and Q1 6303 13D that no voltage other than VB is output Was trouble fixed Check signals of IC 14D pins 14 and 15 Are pulses observed at those pins Check transistors 04 05 Q19 Q22 and Q28 and replace de fective one Replace IC 14D 5 22 REV A Check signal of IC 14D pin 2 Are pulses observed at pin 2 Replace IC 14D Check signals of IC 14D pins 6 and 7 Replace transistor Q29 Are pulses observed at pin 7 Was trouble fixed Replace transistor Q34 Replace inductance L3 Was trouble fixed Replace zener diode ZD20 5 23 REV A Replace CR1 R
20. ed in succession and the follow ing messages are displayed when the tests are completed Fig 5 11 RAM Check Test End Messages 2 Buzzer Check The buzzer sounds for approximately three seconds The buzzer further sounds at two different tones and then the following prompt is dis played BUZZER OE Fig 5 12 Buzzer Check Test Prompt Adjust the sound level and do another check 3 RS 232C and Serial Interface Check Step 1 Insert the RS 232C serial interface connector which is connected according to the instructions in section 5 1 The RS 232C socket is labeled on the PX 8 case Step 2 Key in 3 for the test menu TEST PROGRAM SELECT The RS 232C and Serial Interface Check test will be selected The program runs the RS 232C interfa ce test first displaying the following information ECR ING E CE END NA Fig 5 13 RS 232 Interface Check Phase Information Messages Step 3 The program then runs the serial interface test the display should appear as in Fig 5 14 HIGH SPEED SERIAL ING HIGH SPEED amp TAL END NOW i ee Fig 5 14 Serial Interface Check Phase Information Messages Step 4 These messages indicate the end of the test 5 6 REV A 4 LCD Check The entire LCD panel display is reversed The LCD panel display is reversed every other dot and then the black and white con bination is reversed The LCD panel display is reversed every four dots and then the black and w
21. een cable end and SED1130 pins Replace SED1120s X1 to X8 for missing columns Was trouble fixed Was trouble fixed 5 34 REV A Make sure that DIP switch SW4 on MA PLE board is properly row or column drop in set LCD Check to see whether trouble is caused by Is problem detected in any row Is problem detected in any row or column Is SW4 correctly set Reset SW4 and then Y press INITIAL RESET switch Type in all keys and check for any char acter change or other malfunctions Check whether char AN acter always changes Check continuity of FPC cable at the same position Does character change always occur at the same position Are there Are all 8 or more errors lines good Replace FPC cable Replace keyboard p y Replace LCD panel Was trouble fixed Was trouble fixed Replace SED1120 X1 to X8 for column s of trouble Trouble is in key board possibly a short circuit on a KSC or KRTN line or lines Refer to 5 4 3 Re pairing The Key board 5 35 REV A Reset jumper J5 set ting on MAPLE board Was N trouble fixed Y Replace LCD panel Was N trouble fixed Y Are N any failures in rows Replace SED1130s for rows of failures 5 36 REV A 5 4 3 Repairing The Keyboard
22. eplace IC 7B Is 9 8 MHz signal observed Was trouble fixed Was trouble fixed Is 4 9 MHz clock signal observed Y Replace IC 6A Was trouble fixed N Y Replace IC 7C Replace IC 6A Is 2 45 MHz slave CPU clock signal observed Is 2 45 MHz main CPU clock signal observed Replace IC 6A N Replace main CPU Replace IC 2C 4A Was trouble fixed Was trouble fixed Was trouble fixed Is 32 kHz clock signal observed Check pin 6 signal of Replace IC 4C IC 3D Replace CR2 Replace IC 3E Are pulses observed Was trouble fixed Was trouble fixed Replace IC 5D Replace IC 6A 5 24 REV A Replace sub CPU 7508 2E Replace IC 6A Is 1 kHz pulse signal N observed Was N Y trouble fixed Is 200 N Y kHz sub CPU clock signal observed Readjust sub CPU clock signal with VR3 Replace sub CPU Was N 7508 trouble fixed Is 35 kHz LCD unit clock signal observed Y Replace IC 14D Is correct RS 232C interface clock signal observed y Replace IC 2C Was trouble fixed Is correct serial interface clock signal observed Replace IC 4C Replace slave CPU Y 6303 13D Is correct A D converted clock signal observed Replace A D converter 7001 1D
23. erly received Replace IC 12C Was trouble fixed 5 27 REV A Replace slave CPU Replace sub CPU 7508 Was trouble fixed 6303 Check voltage VRF Was trouble fixed Readjust VRF Measure levels of IC 12D pins 8 and 14 Was trouble fixed Are Y those levels 8V Y N Is that N voltage 15V Measure pin 16 vol tage of AD converter Replace IC 12D 1D Replace slave CPU 6303 y Is 5V Y Was supplied at trouble fixed in Was tent trouble fixed N N Replace transistor Q24 Replace IC 9B Replace SED 1320 70 Replace A D converter 1D Was trouble fixed Was trouble fixed Replace V RAM chips 9C through 11C one by one 5 28 REV A Test speaker output Replace IC 8B Check level of slave by operating micro CPU 6303 13D pin cassette tape drive 20 and using SOUND command Was trouble fixed 7 y Was speaker Y etsia output observed by N ne both Replace VR1 N Replace slave CPU Was speaker Y 6303 output observed by either one Replace IC 7B N Replace slave CPU 6303 13D Was trouble fixed Is this trouble a D RAM failure Examine error bit for this trouble Replace gate array GAH40S 136 Replace sub CPU 7508 2E Replace one of the follo wing
24. g open Y Replace capacitors C11 through C13 in order Was trouble fixed Was trouble fixed 5 48 Replace IC4 REV A Readjust azimuth Is azimuth correctly adjusted Replace P lever as sembly Adjust tape feed speed Was problem resol Can tape be normally read Possibly tape is bad or MAPLE board has a problem Clean read write head and pinch roller Then test read write again REV A Check signals of IC5 Check continuity of Ma or diode D2 Replace transistor Q4 pin n i Are pulses observed Y at those pins which Is are D2 good opposite in phase Was problem resolved N Replace P lever as Replace IC5 Replace D2 sembly Was problem resolved Was problem resolved Was problem resolved Is LED on only during write Is LEO always on Replace LED Is that trouble write protect failure Adjust PE switch Was problem resolved Was trouble fixed GOTO 6 4 5 49 REV A PLAY drive and check signals of IC5 pins 1 Check transistor Q6 N Is N Q6 good Replace Q6 Replace photo reflector FT1 Do pulses appear at pin 1 through 4 Are pulses observed at those pins Check reflector plate on reel shaft for any abnormality Replace IC5 Was problem resolved
25. heir meaning Fig 5 30 Error Message Format Table 5 4 Slave CPU Return Codes and Their Meaning Normal processing termination Break ACK Indicates that a break took place Device SYS 01 SYS 02 Code z o Command error Indicates that a command has been input which is not included in the de fined system SYS 03 Communication error Indicates that a command is received when data was to be recei ved sent or vice versa Illegal size Indicates that a screen over occured which is attributable to an illegal size specification An undefined graphic alphabetic character was used An alphabetic character code was used Or an attempt was made to define any other than that for alphabetic character Head error Indicates that the head failed to operate normally The tape stopped during processing Write protect error An attempt was made to write a tape with no write protect pin N O ie 2CD 2CD Q Q O 4 Data error Indicates that the data could not be determined to be either 1 or O because the data pulse is wider or narrower than the standard value CRC error A linkage failed Communication error Overrun or framing error Timer over 71 BEEP already in progress Indicates that a BEEP or MELODY was attempted when another BEEP or MELODY was already in progress Block mode error A block whose identifier is other than that specified
26. here for second time Slide VIEW ANGLE var iable resistor as view ing LCD panel Did table 1 appear on LCD panel Replace MAPLE board Feel main battery sur face for any abnormal heat with your fingers Turn POWER switch OFF Then remove main battery and mea age Replace LCD unit Is main N Is main battery abnormally N heated battery voltage 4 0V or above Y Main battery is bad Replace it Replace main battery Connect ac adaptor and then press INITI AL RESET switch Charge main battery for 8 0 hours with POWER switch OFF REV A Set switch SW3 off i and measure VB voltage Replace keybo rd unit Replace test program ROM press RESET switch and then re load test pregram Do numeric keys fonction Is VB voltage 4 8V or above Was trouble fixed Set switch SW3 ON Replace MAPLE board Replace maple board Readjust VRF voltage with VR2 Set switch SW3 ON press INITIAL RESET switch and then turn POWER switch ON Did message CHANGE BATTERY appear Replace MARPLE board 5 18 REV A 5 4 Unit Troubleshooting 5 4 1 Repairing The MAPLE Board The following should be noted when repairing the MAPLE board 1 Check to see that the jumpers and switches are correctly set before proceeding with the repair 2 Measure the voltage of the main and auxiliary batteries and
27. hite con bination is reversed The following character pattern appears Fig 5 15 and the test ends rxtx CHRAGENE TEST Kyy HEME OE SOLE Pparstuvws ye TEE Fig 5 15 LCD Check Test Character Pattern 5 MCMT Microcassette Tape Drive Check The following prompt appears Fig 5 16 First MCMT Check Test Prompt If speaker sound output is desired depress Y YES if not press N NO respond by in putting Y YES on N NO as desired The next prompt will appear as follows Fig 5 17 Second MCMT Check Test Prompt Examine the tape and respond with Y to this prompt if the tape data may be des troyed Otherwise key in N A Rewind Fast Feed and Read Write check tests are performed after the following in formation message is displayed MOP CHEEK REWIND ai Fig 5 18 MCMT Check Test Information Message The third prompt appears as follows WRITE TAPE INFMGSIOM TO THIS TAPE 7 Fig 5 19 Third MCMT Check Test Prompt 5 7 REV A The test ends with the following information message Fig 5 20 MCMT Check Test End Message 6 DIP SW Read Check The following information is displayed 4 DIP switch SW4 elements 1 through 8 i f Element setting Fig 5 21 DIP SW Read Check Test Data Make sure that the DIP switch setting agrees with the following table Table 5 3 DIP Switch of Settings Character set specif
28. ication EA sawas Ee EEEE EE EE EN eene fe EE EN Er ha a E ini EI EE TE n DA ETE IE amesa 5 8 REV A 7 Keyboard Check n Step 1 Select your keyboard type by responding with the number following the specification of your unit The following display data prompt will appear Fig B 22 Keyboard Test Display Data Prompt Step 2 In response to the above prompt key in characters to be displayed in the following order i alslals e 7lel Fig 5 23 Keyboard Check Test Character Data Entry The numbers within the parentheses are for a 73 key keyboard When the key data entry ends the following prompt appears Fig 5 24 Keyboard Check Part 2 Test Entry Prompt Step 3 If the keyboard check part 2 test is desired respond with N to this prompt Other wise key in Y The above part 1 test will be repeated The program enters the part 2 test and displays the following prompt Fig 5 25 Keyboard Check Part 2 Test Prompt Step 4 Key in the same characters as randomly displayed following the above prompt 5 9 REV A oe Step 5 To terminate the test key in Break The program will end the test leaving the fol lowing information message Fig 5 26 Keyboard Check Test End Message 8 Analog Input Check Step 1 Connect a DC voltage regulator output voltage range should be from OV to 2 0V and a dry cell battery Use the cable assembly P N B778
29. lure Is problem a replay read failure Is problem a write failure Is problem an erase failure Is problem a tape count failure Is problem a cover eject failure Is problem an LED indication failure 5 44 REV A MICRO CASSETTE UNIT REPAIR ENTRY TABLE Is any abnormal sound heard Is problem a compatibility problem Is problem a speaker output failure Cassette tape drive unit has no trouble Test read write using a work tape REV A Remove tape and per form fast forward and Perform play opera tion SAVE or LOAD rewind operations 5 Is reel N dee while observing reel always rotating while visually check motion ing reel operation Y Does Y reel rotate Replace TC1 on MAP N N MC board Does not reel at all Check input voltage at pin 14 of IC2 Was y trouble fixed Was p ls ma trouble ut voltage fixed 4 0V or above Check input voltage at pin 9 of IC1 Possibly a problem on MAPLE board Check continuity of FPC ca ble signal lines from connector CN3 to ca ble connector pins If no problem found re place MAPLE board Check output voltages at IC1 pins 3 through 8 Is that input voltage 4 0V or above Are all those voltages 1 5V or above
30. s Visually check key board If any problem is found repairas re quired Test keyboard with test program to evalvate all functions Type in all function and control keys and check for proper func tions Did N all keys properly function Y Is y there any LCD problem Upper Code Byte Lower Code Byte Does any key catch or fail to operate smoothly Remove keytop of that key and check in side for any foreign matter Examine physical ap pearance and stroke of all individual keys Was any foreign matter found Remove that foreign matter Does any key stick Replace that key Resolder that key switch Was problem resolved Was problem resolved Check all keybaord functions with test program Do you pass this route for second time Replace keyboard unit Was trouble fixed 5 39 REV A Press that key and test continuity be tween key switch contacts Possibly a short cir cuit in FPC cable or printed pattern on cir cuit board Check in sulation between all LED anodes and KSC lines Is resistance 0 ohm Was y any short circuit found Test isolation be tween key switch N Inspect soldering of that line and remove
31. the ROM If the ROM is difficult to remove alternately raise both the ends with a flat screw driver t Cover Fig 5 2 ROM Capsule Cover Removal Fig 5 3 ROM Removal 5 3 REV A Step 4 Insert the test program ROM in the capsule Make sure that the ROM pins are proper ly inserted into the socket Note When neither ROM capsule is empty the test program ROM may be inserted in either ROM socket ROMB or ROMC When one ROM is already installed in sert the test program ROM in the empty socket d ROM capsule Fig 5 4 ROM Capsule Sockets Step 5 Replacethe ROM capsule cover 5 2 3 Loading the Test Program Set the POWER switch ON and check to see that the menu shown in Fig 5 5 appears on the LCD panel The display varies depending on the inserted ROM If nothing appears on the panel press the RESET switch Fig 5 5 Tet Program Menu Move the cursor so that MAPTST blinks and then press the RETURN key Note One of the messages shown in Fig 5 6 will be displayed depending on the ROM capsule socket in which the program ROM is inserted 1 Message displayed when test 2 Message displayed when test program ROM is inserted in program ROM is inserted in ROM 1 socket ROM 2 socket Fig 5 6 Test Program ROM Location Information Messages 5 4 REV A After the above preparation the following menu will appear on the LCD panel _ PROGRAM PEBL ALTE HANLIE Fig
32. verify whether the trouble is caused by insufficient voltage 3 Care must be used to avoid short circuits on either side of the board Any short circuit will short circuit the auxiliary battery resolting in damage to other circuits 4 Before testing circuit continuity or element function with a circuit tester make sure that the line or element to be tested is not backed up by battery Whenever the battery backed up line has to be checked remove the auxiliary battery from the board before the test Others Depending on location of the problem a MAPLE board failure may present various symptoms and troubleshooting is harder Check the computer for any basic problem according to the procedure below first If no problem is found by these checks use the troubleshooting and repair the test program and repair flowchart 1 Check the jumpers and switches for any improper setting 2 Check the logic circuit voltage and clock signal Also check fuse F1 3 Check the connectors for any imperfect contact Von Execute test program If a definite phenome non can be observed go to the correspond ing entry Otherwise check the following in sequence lt gt Power supply Keyboard RS 232C interface Serial interface Barcode interface Analog input interface GOTO 8 1 MAPLE BOARD REPAIR ENTRY TABLE 5 20 Speaker ROM capsule Microcassette tape drive unit The trouble is possi bl
33. y in another unit or connection Replace MAPLE board to recheck whether the trouble is MAPLE board or not GOTO 9 4 GOTO 10 4 REV A REV A Measure main VB and auxiliary battery voltages Is VB 4 8V or be low With no ac adaptor connected Is VB 4 8V or above Replace main battery possibly a inter cell short or open circuit Is auxiliary battery voltage 4 8V or above Does battery leak Connect ac adaptor and turn POWER switch ON Set switch SW3 ON Was information displayed on LCD panel Is this routine run for second time Readjust VIEW AN GLE variable resistor Possibly a short cir cuit on backup line due to a defective ele Is this routine run for second time Connect ac adaptor and start 8 hour charge Measure main battery voltage with ac adap tor connected loaded voltage and discon nected unloaded vol tage If main battery is bad open jumper J72 overcharge control Is unloaded voltage 9 1V Is loaded voltage 6 0 5V Possibly an open cir cuit in charging cir cuit Is Is ac input charging current 400 within 10 of rat N mA Ing Change ac input or above Replace ac adaptor Change ac input ment Find and re place defective ele ment through visual check and physical feel for ex
34. ymptom that occurred first Notes on using the flowcharts 1 The troubleshooting flowcharts do not necessarily include all information required for trouble shooting such as check modes etc Thus the flowchart context and trouble symptoms should be closely examined 2 If the troubleshooting flowchart instructions lead you into a loop or to the end of a procedure and the problem is not resolved refer to the schematic drawings or proceed by troubles shoo ting according to the following procedure Step 1 Replace the faulty unit with a good one and make sure that the faulty unit is really mal functioning Step 2 If the problem is difficult to reproduce or occurs so briefly that it is hard to examine the symptom vary the supply voltage according to the following instructions a Disconnect the battery from the battery connector CN2 b Prepare a variable O 10 DC voltage regulator and make sure that the output is turned off c Connect the regulator to the CN2 connector in place of the battery d Adjust the regulator output voltage to 5V e Turn the regulator output on After the above setup is completed vary the regulator output in a range from 4 8V to 6 0V and ex amine the unit operation at each voltage level If this voltage margin test is successful maintain the voltage and proceed with troubleshooting using tne check out procedure and trouble shooting flowchart REV A 5 3 Check out Procedure Start Table 5 1 SYST
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