Service manual

H/Z-100 Service Bulletins
1045 and HE 443-1075. Cross out part number HE 443-1075.
FSB-Z100-030: Z-207 Manual Correction; Transistor (Q2 and Q3) Markings
In the Z-207 Floppy Disk Controller Card Manual HE 595-2909-01, make the
following changes:
- Page 7: Left column, under "Transistors",
Change: C3 417-937 2 MPS2369 Q2, Q3
To: C3 417-937 2 MPS2369 or PN2369A Q2, Q3
- Page 18: Left column, fourth and fifth steps,
Change: ...MPS2369 transistor...
To: ...MPS2369 or PN2369A transistor...
- Page 59: "Transistors" chart, in the "May Be Replaced With" column,
Change: MPS2369
To: MPS2369 or PN2369A
FSB-Z100-031: C35 Fails on Floppy Controller Board
The 10 uF electrolytic capacitor at C35 on the Floppy Controller Board, 85-2807-1, is
being installed backwards because of incorrect circuit board screening and incorrect
instructions in the assembly manual and the HE 591-4245 manual insert. So, on any
HE 85-2807-1 board received for service, install the capacitor at C35 with the "+"
lead connected to pin 21 of U22. The 85-2807-0, -2, and -3 controller boards are
correct.
FSB-Z100-032: Winchester Disk Drive Configuration
Some confusion has arisen on proper configuration of replacement Winchester disk
drives for operation within H/Z-100 computers. As shipped, the 16-pin programming
plug usually has all pin pairs shorted with the possible exception of pin pairs 3-14
and 4-13. To eliminate confusion while configuring the programming plug, a
configuration guide is given below. Refer to the guide when replacing Winchester
disk drives in these units.
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