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Here is the pdf scanned copy of the Z88 Service Manual dated January 1985.

File attachment sizes are limited, so each page is a separate pdf file.

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Pages


List of Contents	History Sheet	Safety Measures	Section 1.1	1.2
1.3	1.4	1.5	1.6	1.7
1.8	1.9	1.10	1.11	1.12
1.13	1.14	1.15	1.16	1.17/18
1.19/20	1.21/22	1.23/24	Section 2.1	2.2
2.3	Section 3.1	3.2	3.3	3.4
3.5	3.6	3.7	Section 4.1	4.2
4.3	4.4	4.5	4.6	4.7
4.8	4.9	4.10	4.11	4.12
Section 5.1	5.2	5.3	5.4	5.5
5.6	5.7	5.8	5.9	Appendix A.1
A.2	A.3	A.4	A.5	A.6

Additional Information

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Information

1.2

Modification History

The following information has been copied from an A2 size Cambridge Computers Z88 Circuit Diagram

Drawn by F.I. 4.4.87 Checked by A. A. R. 13.4.87

Issue No	Date	Change No	No.	Description of Change
1	4.4.87
2	29-4-87	CCL 1 - 7	1	R52 (22K) removed
		TED	2	IC3 pins 1, 30, 31, 32 conn to VCC not SVCC
		ECN 2232	3	Conn pin 20 of SK 2, 3, 4 to VCC instead of SVCC
			4	Conn pin 19 of SK 2, 3, 4 to VCC instead of SVCC
			5	Conn RP6 pin 1 to VCC instead of SVCC
			6	Conn C27 to VCC instead of SVCC
			7	R38 change from 1M to 47K
			8	C23 change from 100nF to 10nF
			9	Conn R17 to IC1 pin 17 instead of VCC
			10	Add TR25
			11	Add R80
			12	Add R81
			13	Add D30
3	12-6-87	CCL 7 - 12	14	R41 change from 470R TO 150R
		TED	15	Remove R23 from SVCC and conn in // with D9
		ECN 2330	16	Add C31 1nF from GND to IC4/97
			17	Add C32 330pF from IC1/17 to GND
			18	Add 10M res between SK10 pin 1 and metal case
			19	Add RV2 5K0 in // with RV1

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