Sinclair QL Servisní příručka

the processor data bus. If this functions correctly it is close to a guarantee that the whole system is functional.9.2 A test tape is available which

SECTION 2DISASSEMBLY/ASSEMBLY 1. DisassemblyAccess to Internal ComponentsMicrodriveCircuit BoardLoudspeakerMicrodrive: Disassembly for RepairKeyboard

1.6.2 Release six 1/4-in pan head screws securing the keyboard backing plate to the upper case. This allows the plate, with membrane attached,to be li

SECTION 3SYSTEM TEST 1. Introduction2. System Test3. Procedure1. Power-Up2. Colour Test3. Sound Test4. Network Test5. RS232C Loopback Test6.

3.1.4 Insert a blank tape cartridge into MDV2 as requested.3.2 Colour Test3.2.1 After the message to load a blank cartridge into MDV2 is displayed, bo

3.6 Keyboard Test3.6.1 Check that the following is displayed:3.6.2 Press the key indicated by a dark blue background on the display. The blue backgrou

3.9.1 Check that the following message is displayed and that MDV2 starts to run and the corresponding red LED is illuminated.3.9.2 Insert a blank cart

3.12 End of Test3.12.1 On satisfactory completion of Microdrive 1 Test the following message should be displayed on green:QL TEST COMPLETE3.12.2 Press

SECTION 4FAULT DIAGNOSIS AND REPAIR 1. Introduction1. Test Equipment2. Modification History3. Mandatory Modifications2. Fault Diagnosis1. Techni

Build Standard ICROM EPROMSoftware Standard RemarksD6IC33 - 32kAH 16k of EPROM mounted pickaback on IC33IC34 - 16kD7IC33 - 32kJM 16k of EPROM mounted

Sinclair QL Service ManualPrepared by THORN (EMI) DATATECH LTD for SINCLAIR RESEARCH LTDOCTOBER 1985© Sinclair Research Ltd.SERVICE MANUAL X-1204List

F1...MONITORF2...TELEVISION© 1983 Sinclair Research Ltd2.2.2 This indicates that most of the system is working. If the QL does not power up, and displ

2.2.16 Where uncertainty exists as to the best place to start fault finding, carry out the following checks by comparing with a known good board:IC23P

300 DEFine PROCedure stop_all310 sedes 8,0320 END DEFineKey-in start_mdv(n) to turn on drive number n and to keep it spinning continuously. Key-in sto

Erase function not working.1. Check TR3, D28.2. Renew IC23.MDV1(2) does not run Check TR7(TR6), TR5(TR4)2.5 Video2.5.1 Video faults are either total

Keyboard locks-up after prolonged use. Renew IC24Renew IC18RS232-C/Printer Fails RS232 loopback test.Check J5, J6Renew IC25, IC26Renew IC23Renew IC24N

10. Return EPROMs to Sinclair Research Ltd.FIGURE 4.2 KEYBOARD FORMATFIGURE 4.3 HEAD CHASSIS

APPENDIX A TO SECTION 4KNOWN BUGS AND THEIR REMEDIES 1. Monitor Connections2. Known Bugs3. Printing Problems4. SER Outputs5. How to Cure a Crashi

3. The command "CURSOR #n, a, b, c, d" is not accepted.Clue: "CURSOR #n, a, b, c, d" gives "bad parameter" (NB: message

buffer full of data is printed.3.3 If the problem does occur, look at the wiring of the RS-232 lead on the end that connects to the printer, and check

APPENDIX B TO SECTION 4USER HINTSThe following points may be of help in spotting 'non-faults' on QLs. 1. Please note that if you want the Q

SECTION 1SYSTEM DESCRIPTIONLIST OF CONTENTS 1. Introduction2. Architecture3. MC68008 CPU4. Intel 8049 Intelligent Peripheral Controller (IPC)5. M

APPENDIX C TO SECTION 4MANDATORY MODIFICATIONS 1. Fitment Checks2. Improvement to Microdrive Performance1. FITMENT CHECKS1.1 Refer to the mandatory

FIGURE C3 ISSUE 6 BOARD - SOLDER SIDE (SRL/EI/1119-1)

APPENDIX D TO SECTION 4MICRODRIVE FAULT FINDING 1. Introduction2. Mechanical Checks3. Using the Signal Test ProgramWrite CheckRead CheckErase Check

3.3.1 After writing to tape, carry out the following while in read mode. 1. Check data lines ULA pins 19 (24) and compare to fig D3. If the waveform

340 PAUSE 50350 SAVE ser1360 END DEFineTABLE D1 - SIGNAL TEST PROGRAMFIGURE D1FIGURE D2MICRODRIVE SIGNAL (100 KHZ WRITE)FIGURE D3FIGURE D4FIGURE D5MIC

FIGURE D9 ULA 2G007 - INTERNAL CIRCUIT

SECTION 5

PARTS LISTS 1. Serial Numbers2. Parts List/Modification History3. Retrospective (Mandatory) Modifications4. Notes to Tables1. SERIAL NUMBERS1.1 Th

2. PARTS LISTS / MODIFICATION HISTORY2.1 Parts lists for the Sinclair QL are presented in tabular form. They cover p.c. board Issue 5 (build standard

Keyboard and Bubble MatKeyboard Assembly FixingsAdhesive Cable ClipDouble-sided Tape (0.5-in wide)1/4-in self-tap - keyboard backplateROM Cartridge Bu

3.4 Control Bus. The control bus is a collection of individual signals which supervise the flow of data on the address and data busses. The blockdiagr

As Issue 5R40 R41 4K7 5%, 1/4WR42 R43 4K7 5%, 1/4WR44 R45 4K7 5%, 1/4WR100 R101 2K2 5%, 1/4WDIODESD12 D13 1N4148As Issue 5D14 D15 1N4148D22 D23 1N4148

R8 47KAs Issue 55%, 1/4WR9 3K3 5%, 1/4WR10 680R 5%, 1/4WR11 1K 5%, 1/4WR12 3K9 5%, 1/4WR13 10K 5%, 1/4WR14 47R 5%, 1/4WR15 330R 5%, 1/4WR16 330R 5%, 1

R105 1K 1K (2) 5%, 1/4WR106 1K 1K (2) 5%, 1/4WJU1-6 ZERO Ω - (3)DIODESD1-D17 1N4148As Issue 5D20 LD235R RED LED SIFAMD21 LD235R RED LED SIFAMD25 BA157

J11 TE9FS/18B 9-way flexJ12 TE11FS/18B 11-way flexHBC1/2 4 off Aries, 7-way flex. socketLS MWP2P-1B BurndyLEDS (D20, D21, D27) MWP6P-1B BurndyMISCELLA

Table of ContentsSinclair QL Service ManualList of ContentsList of IllustrationsHistory SheetSECTION 1SYSTEM DESCRIPTIONLIST OF CONTENTS1. INTRODUCTIO

4. SER OUTPUTS5. HOW TO CURE A CRASHING QL6. FLICKERING DISPLAYSAPPENDIX B TO SECTION 4 USER HINTSAPPENDIX C TO SECTION 4 MANDATORY MODIFICATIONS1. FI

HIGH HIGH HIGH Interrupt Acknowledge3.17 System Control inputs are used to either reset or halt the processor and to indicate to the processor that bu

FIGURE 1.1 RS232 LINK4.10 On receipt of a start bit, IC24 is interrupted, and a subroutine clocks in the data bits, synchronised by the baud rate gene

the loudspeaker. The loudspeaker is damped by resistor R104 (post-Issue 6 only).5. MEMORY ORGANISATION5.1 Introduction5.1.1 The pre-Issue 6 version wa

6.1.3 The net result is the five video signals output from IC22 on pins 32, 31, 30, 12 and 11.6.1.4 The RGB signals are fed to level-setting resistor

being written. The erase head is displaced from the write head and is timed by IC23 to sink current before the write head is enabled.7.2 Microdrive Se