SECTION 5
PARTS LISTS

1. Serial Numbers
2. Parts List/Modification History
3. Retrospective (Mandatory) Modifications
4. Notes to Tables

1. SERIAL NUMBERS

1.1 The serial number is visible on a label attached to the underside of the Sinclair QL thus: D13 59643. Prefix D13 relates to the build standard (B/S) and Issue Number, 59643, is the number of the production run.

2. PARTS LISTS / MODIFICATION HISTORY

2.1 Parts lists for the Sinclair QL are presented in tabular form. They cover p.c. board Issue 5 (build standard D6 to D13) and p.c. board Issue 6 (build standard 14 and beyond). The Issue 6 p.c. board introduces a number of relatively minor circuit changes from Issue 5. These are illustrated in Figures 5.1 and 5.2 and itemised in Tables 5.1 to 5.5 under separate columns labelled Issue 5 and Issue 6.

2.2 Items listed on Issue 5 relate to build standard D13, incorporating the latest version firmware (i.e. 32k and 16k JM masked ROMs in IC33, IC34 respectively). Earlier build standards (D6 to D10) saw the progressive introduction of improved firmware starting with a pickaback 16k EPROM replacing the external 'dongle'. A history of these early units is tabulated below.

2.3 Build standard D12 saw the introduction of modifications to the microdrive circuits foil owed by a new microdrive cartridge chassis at build standard D13. The JM version ROM firmware and microdrive improvements were carried out to Issue 6 (build standards D14, D15).

3. RETROSPECTIVE (MANDATORY) MODIFICATIONS

3.1 In order to improve performance and reliability the following components must be added/replaced on all pre-build standard 12 QLs returned for repair (see Section 4).

1. R104 (82 Ω) introduced in TR1 collector circuit.
2. R92 (formerly 220 Ω) increased to 390 Ω.
3. R105/R106 (1 kΩ) introduced across C19, D17.
4. D22/D23 (1N4148) introduced in series with R100/R101.
5. R102/R103 (33 kΩ) introduced between IC23 pins 21 and 19 and VM12 (-12 V rail).
6. firmware (IC33, IC34) to be upgraded to build standard D11.

4. NOTES TO TABLES

1. Early Issue 5 boards fitted with 43 kΩ resistors; do not replace unless it does not meet colour test criteria.
2. Retrospective (mandatory) modification required - see sub-section 3 (above) and Section 4 - Fault Diagnosis and Repair.
3. Fitted according to build standard and Issue.
4. BC183P is alternative type - NOTE: leads are reverse of BC184.
5. IC17 only fitted on Issue 5 EPROM versions.
6. IC38 replaces IC27 on Issue 6 versions.

TABLE 5.1 GENERAL ASSEMBLY

Description					Manufacturer/Type
QL Base Assembly
	Microdrive Chassis (2 off) - Table 5.3
	Final PCB Assembly - Table 5.5
	Loudspeaker Assembly				60 Ω, 23 mm, TV
	Heatsink Assembly - Table 5.2
	Bottom Case Moulding
		Bottom Case Fixings
			1/4-in self-tap (2 off)	PCB Fixings
			Fibre washer (2 off)
			5/16-in self-tap (2 off)	MDV Fixings
			1/2-in self-tap (2 off)
			3/4-in self-tap (2 off)
QL Keyboard Assembly
	Yellow LED (D27)
	Red LED - 2 off (D20, D21)
	QL Membrane
	Keyboard Backplate
	Keyboard and Bubble Mat
		Keyboard Assembly Fixings
			Adhesive Cable Clip
			Double-sided Tape (0.5-in wide)
			1/4-in self-tap - keyboard backplate
	ROM Cartridge Bung
	MDV Extension Bung
	BUS Extension Bung
	General Assembly Fixings
		5/16-in self-tap (4 off)		Keyboard/Base
		1 1/4-in self-tap (4 off)

TABLE 5.2 HEATSINK ASSEMBLY

Description				Manufacturer/Type
Heatsink				Wakefield Mk.2
	+5V Regulator (IC35)			7805
	3-pin connector			Molex, 4025
	Heatsink Fixings
		M3 x 10 mm pan hd screw	1-off
		M3 plain washer	1-off
		M3 crinkle washer	1-off

TABLE 5.3 MICRODRIVE CHASSIS

Description			Manufacturer/Type
Microdrive Cassette Chassis Assembly
	Cassette Chassis
		Motor Assembly
		Microswitch Assembly
		Drive Roller (parallel)
		Plastic Roller
	Cassette Chassis Fixings
		M2.5 x 4 csk self-tap, motor fixings
		2,28 x 3/5-in self-tap, microswitch fixing
Microdrive PCB Assembly - Table 5.4
	PCB Fixings
		No. 4 x 5/16-in self-tap (2 off)
		Fibre Washers (2 off)
ULA Screen

TABLE 5.4 MICRODRIVE BOARD

Circuit Ref		ISSUE 5	ISSUE 6	Notes	Rating/% Tol	Manufacturer/Type
MDV1	MDV2
CAPACITORS (all axial types unless otherwise stated)
C5	C6	330 pF	As Issue 5		2.5%	HS30, Suflex
C9	C10	0.47 F			35V	ITT
C11	C12	0.22 F			35V	ITT
C13	C14	330 pF			2.5%	HS30, Suflex
C15	C16	220 pF			2.5%	HS30, Suflex
C17	C18	220 pF			2.5%	HS30, Suflex
C49	C50	47 nF			50V
C51	C52	47 nF			50V
DC28	DC29	100 F			50V, 10%+80%
RESISTORS
R34	R35	330R	As Issue 5		5%, 1/4W
R36	R37	330R			5%, 1/4W
R38	R39	4K7			5%, 1/4W
R40	R41	4K7			5%, 1/4W
R42	R43	4K7			5%, 1/4W
R44	R45	4K7			5%, 1/4W
R100	R101	2K2			5%, 1/4W
DIODES
D12	D13	1N4148	As Issue 5
D14	D15	1N4148
D22	D23	1N4148		(2)
INTEGRATED CIRCUITS
IC29	IC30	2G007-Issue 3	As Issue 5		ULA	Ferranti
IC31	IC32	78M05			+5V Regulator
MISCELLANEOUS
HBC1	HBC2	A10021	As Issue 5	2-off each		7-way flex. connector/cable

TABLE 5.5 FINAL BOARD ASSEMBLY

Circuit Ref	ISSUE 5	ISSUE 6	Notes	Rating/% Tol	Manufacturer/Type
CAPACITORS
C1	32 pF	As Issue 5		5%	Ceramic
C2	22 pF			5%	Ceramic/TB
C4	4.7 pF			25V, -10%+50%	Electrolytic/Axial
C19	47 nF			50V
C20	47 nF			50V
C21	22 µF			16V	Electrolytic/Radial
C22	22 pF			16V	Electrolytic/Radial
C23	22 pF			16V, -10%+50%	Electrolytic/Axial
C24	22 pF			16V, -10%+50%	Electrolytic/Axial
C25	22 µF			16V, -10%+50%	Electrolytic/Axial
C26	0.01 pF			20%	Ceramic/TB
C27	0.1 pF			50V, -20%+80%
C28	0.1 µF			50V, -20%+80%
C29	220 pF			10%
C30	220 pF			10%
C31	16 pF	22 pF		5%	Ceramic
C32	0.01 µF	As Issue 5		20%	Ceramic/TB
C33	0.1 µF			50V, -20%+80%
C34	47 pF			5%	Ceramic/TB
C35	100 µF			-10%, +80%	Electrolytic/Axial
C36	47 nF			50V
C37	470 pF			25V, -10%+50%	Electrolytic/Axial
C38	4.7 µF			16V	Electrolytic/Radial
C39	470 µF			25V	Electrolytic/Radial
C40	4.7 pF			16V	Electrolytic/Radial
C41	0.33 pF			50V	Electrolytic/Radial
C42	47 pF			10V	Electrolytic/Radial
C43	0.1 µF			50V, -20%+80%
C44	0.1 µF			50V, -20%+80%
C45	1 nF			2%	Ceramic
C46	0.1 µF			50V, -20%+80%
C47	22 µF			16V	Electrolytic/Radial
C48	0.01 µF			20%	Ceramic/TB
C53	NOT USED	22 pF		5%	Ceramic
DC1-29	0.1 pF	0.1 µF		50V, -20%+80%
RESISTORS
R1-R6	3K3	As Issue 5		5%, 1/4W
R7	330R			5%, 1/4W
R8	47K			5%, 1/4W
R9	3K3			5%, 1/4W
R10	680R			5%, 1/4W
R11	1K			5%, 1/4W
R12	3K9			5%, 1/4W
R13	10K			5%, 1/4W
R14	47R			5%, 1/4W
R15	330R			5%, 1/4W
R16	330R			5%, 1/4W
R17-24	10K			5%, 1/4W
R25	180R			5%, 1/4W
R26	3K3			5%, 1/4W
R27	3K3			5%, 1/4W
R28	1K			5%, 1/4W
R29	1K			5%, 1/4W
R32	820R			5%, 1/4W
R33	820R			5%, 1/4W
R46	1K			5%, 1/4W
R47	2K2			5%, 1/4W
R48	8K2			5%, 1/4W
R49	8K2			5%, 1/4W
R50	8K2			5%, 1/4W
R51	1K			5%, 1/4W
R52	1K			5%, 1/4W
R53	1K			5%, 1/4W
R54	47K		(1)	1%, 1/4W
R55	2K2			1%, 1/4W
R56	6K8			5%, 1/4W
R57	11K			5%, 1/4W
R58	55K6			5%, 1/4W
R59	22K			5%, 1/4W
R61	15R			5%, 1/4W
R62-69	3K3			5%, 1/4W
R70	1M			5%, 1/4W
R71	2K2			5%, 1/4W
R72-79	33R			5%, 1/4W
R80	15M			0.5W
R35	100R			5%, 1/4W
R86	270R			5%, 1/4W
R87	1K			5%, 1/4W
R88	75R			5%, 1/4W
R89	1K			5%, 1/4W
R90	1K			5%, 1/4W
R91	47K			5%, 1/4W
R92	390R		(2)	5%, 1/4W
R93	3K3			5%, 1/4W
R94	3K3			5%, 1/4W
R95	1K			5%, 1/4W
R96	2K2			5%, 1/4W
R97	1K			5%, 1/4W
R98	4K7			5%, 1/4W
R99	2K2			5%, 1/4W
R102	33K	ZERO Ω	(2)	5%, 1/4W
R103	33K	ZERO Ω	(2)	5%, 1/4W
R104	82R	82R	(2)	5%, 1/4W
R105	1K	1K	(2)	5%, 1/4W
R106	1K	1K	(2)	5%, 1/4W
JU1-6	ZERO Ω	-	(3)
DIODES
D1-D17	1N4148	As Issue 5
D20	LD235R			RED LED	SIFAM
D21	LD235R			RED LED	SIFAM
D25	BA157
D26	BA157
D27	LD235Y			YELLOW LED	SIFAM
D28	1N4148
D29	1N4148
TRANSISTORS
TR1	BC184	As Issue 5	(4)
TR2	ZTX510/BSX29-SGS
TR3	BC184		(4)
TR4	BC184		(4)
TR5	RC184		(4)
TR6	ZTX551
TR7	ZTX551
TR8	ZTX313/MPS2369
TR9	ZTX313/HPS2369
INTEGRATED CIRCUITS
IC1-16	HM4864P-2	As Issue 5	Alternatives		Hitachi
	TMS4164-15NL				Texas
	MCM6665AP15				Motorola
	MK4564N15				Mostek
	UPD4164C-3				NEC
	MSM3764-15RS				OKI
	TMS4146-12NL				Texas
	HYB4164P2BD				SIE
IC17	74LS00		(5)
IC18	MC68008				Motorola
IC19, IC20	74LS257				NOT Nat. Semi
IC21	74LS245				NOT Nat. Semi
IC22	ZX8301				Plessey/Sinclair
IC23	ZX8302				NCR/Sinclair
IC24	8049				NEC
IC25	1488
IC26	1489A
IC27	74LS03
IC28	MC1377P	MC1377P			Motorola
IC33		23256	(2)		32k ROM, JM Mask
IC34	23128	23128	(2)		16k ROM, JM Mask
IC36	79L12	79L12			-12V Regulator
IC37	78L12	78L12			+12V Regulator
IC38	-	HAL16L8	(6)		Sinclair
CONNECTORS
J1	64-way	As Issue 5			Viking, Euro connector A/B
J2	30-way				Edge connector
J3, J4	603A LH				BICC, BT type
J5, J6	603A RH				BICC, BT type
J7	Jack				8-pin DIN
J8	3-pin Skt				Phillips, Mains
J9, J10	Jack				Single pol, NC
J11	TE9FS/18B				9-way flex
J12	TE11FS/18B				11-way flex
HBC1/2			4 off		Aries, 7-way flex. socket
LS	MWP2P-1B				Burndy
LEDS (D20, D21, D27)	MWP6P-1B				Burndy
MISCELLANEOUS COMPONENTS
TC1	540pF	As Issue 5			Trimmer
M1	UM1233				Astex, E36 Modulator
X1	HC18-U				15MHz, 20ppm
X2	MX38				32.768kHz, 20ppm
X3	HC18T-U				4.4336MHz, 20ppm
X4	-				11MHz, 10ppm
S3	RESET		P/B Switch		Schadow, DPCO

FIGURE 5.1 PRINTED CIRCUIT BOARD (Issue 5) COMPONENT LAYOUT

FIGURE 5.2 PRINTED CIRCUIT BOARD (Issue 6) COMPONENT LAYOUT