Service manual

H/Z-100 Service Bulletins
10 'CROSSHATCH
20 CLS
30 FOR I=0 TO 640 STEP 30
40 LINE (I,0)-(I,240),7
50 NEXT I
60 FOR I=0 TO 250 STEP 15
70 LINE (0,I)-(630,I),7
80 NEXT I
90 GOTO 90
10 'DOTBAR
20 CLS
30 FOR I=0 TO 39
40 FOR L=0 TO 24
50 PRINT ".";
60 NEXT L
70 NEXT I
80 GOTO 80
FSB-Z100-011: J101 and J102 ROM Jumpers Incorrect
On page 2-20 of the Z-100 Interim Service Manual (HE 860-15) and page 3-10 of
the Z-100 Service Manual (593-75), the table showing J101 and J102 jumper
positions for the 16K and 32K ROMs is incorrect. Shown below is a corrected table.
The jumper descriptions given on page 2.4 of the Z-100 Technical Manual are
correct.
ROM J101 J102
2764 (8K) 0 0
27128 (16K) 0 1
27256 (32K) 1 1
FSB-Z100-012: Unreliable 64K RAM ICs
Texas Instruments 64K RAM chips, date coded from 8146 to 8236, may not operate
reliably. To correct, replace these ICs with ones having a different date code.
FSB-Z100-013: Z-120 Beeps, But Fan Won't Run; Vertical Roll
Check to see if the sweep circuit board is properly installed. If this board is installed
incorrectly, the foil side of the circuit board may touch the CRT support panel and
short out the circuit board. FSB-Z100-045 also applies.
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