Service manual

H/Z-100 Service Bulletins
- Schematic VB1
Locate VIDRAMDRY at P305-62 and remove the overbar. This line asserts on logic
one.
Refer to the table shown below as you update your schematic.
IC Location From To
U345-2 68A21 PIA L H*
U345-4 68A21 PIA L H*
U345-9 68A21 PIA L H
U345-19 68A21 PIA L H
U301-13 Paral/Ser.Conv. Q4 QH
U337-1 Timing & Ctrl L H*
U337-3 Timing & Ctrl L H*
U337-14 Timing & Ctrl P L*
U337-16 Timing & Ctrl P L*
U371-14 VRAMSEL PROM L H
- Schematic VB3
Refer to the table shown below as you update your schematic.
IC Location From To
U307 RGB driver F244 LS244
- Z207 Schematic
Locate the lower portion of U9 (near the 5" interface connector) and change the
buffer symbol as follows:
FSB-Z100-005: Z-207 Floppy Disk Controller Card
More Efficient Heat Sink Grease
To allow a more efficient transfer of heat from regulator (PS3) to the heat sink, the
silicone grease (HE 352-13) was replaced with thermal compound (HE 352-31). To
correct your Z-100 Service Manual, page 5-180, second column, change "silicone
grease HE 352-13" to "Thermal compound HE 352-31."
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