Service manual

H/Z-100 Service Bulletins
positive and negative leads of the 10 uF capacitor are positioned to the left of the
component side of the board (with the 100-pin connector down).
This update was performed only "as needed." (I don't know about earlier boards, but
the 85-2807-2 and -3 boards already have both capacitors installed, as C32 and C32-
1. Check earlier boards, the -1 board also may have it installed - ed.)
FSB-Z100-025: Reprint of FSB-Z100-011
FSB-Z100-026: Z-100 Interim Service Manual Corrections
Please make the following corrections to the Z-100 Interim Service Manual:
- Page 3-104: In the second & third paragraphs, cross out "video board" and write in
"motherboard."
- Page 3-120: Fifth step from the bottom, change "U152-13 = L" to "U152-13 = P."
- Schematic MB3: Locate U170; this is a dual 4-input NAND gate in the refresh
timing and the wait timing circuits. Cross out "ALS40" and replace it with "ALS1020."
- Z-207 Floppy Disk Controller Schematic:
-- Locate the INTRQ line at U22-39 and trace it left to U25-3 (next to RP3-2).
Change U25-3 to U25-13.
-- Locate the two inverter sections labeled "U28" beside "U15" and "U14" on your
schematic (see the following figure) and change to "U10."
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