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Kurzweil PC88 - Page 99

Kurzweil PC88
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Chapter
4
Test
Point
TP54
TP55
TP56
TP57
TP58
TP59
TP60
TP61
TP74
TP75
TP76
TP77
TP78
TP79
TP80
TP81
TP83
TP88
TP90
TP91
TP92
TP93
TP96
TP105
TP108
TP109
TP112
TP113
Name
ITT3
ITT4
ITT5
ITT6
ITT7
MUTE
EXTMIDITxDb
EXTMIDITHRUb
EXTIRQb,
1
-
J2
U21PU43
U21PU42
U21PU41
U21PU40
U21PU39
U21PU38
U21PU37
IRSENSEb
IRDRIVEb
IFPCA
IFPCB
IFPCC
IFPCD
IEXTMIDITxD
U21PU57
NVRAMSELb
CPUR/Wb
U16PU9
MTOPI6
Location
Schematic
Location
P54,
U17
G1,
Sht.
1
of
6
P53,
U17
G1,
Sht.
1
of
6
P52,
U17
G1,
Sht.
1
of
6
P51,
U17
G1,
Sht.
1
of
6
P50,
U17
G1,
Sht.
1
of
6
P11,
U8
K4,
Sht.
2
of
6
P5,
U5
J6,
Sht.
2
of
6
P9,
U5
J7,
Sht.
2
of
6
P47,
U21
K5,
Sht.
2
of
6
P37,
U21
13,
Sht.
2
of
6
P38,
U21
J3,
Sht.
2
of
6
P39,
U21
13,
Sht.
2
of
6
P40,
U21
J3,
Sht.
2
of
6
P41,
U21
13,
Sht.
2
of
6
P42,
U21
J3,
Sht.
2
of
6
P43,
U21
13,
Sht.
2
of
6
P10,
U17
D3,
Sht.
1
of
6
P11,
U17
E7,
Sht.
1
of
6
P49,
U17
H3,
Sht.
1
of
6
P48,
U17
G3,
Sht.
1
of
6
P47,
U17
G3,
Sht.
1
of
6
P46,
U17
G3,
Sht.
1
of
6
P28,
U21
16,
Sht.
2
of
6
P57,
U21
15,
Sht.
2
of
6
P14,
U4
F5,
Sht.
3
of
6
P2,
U8
or
F2,
Sht.
4
of
6
P3,
U8
P9,
U16
C2,
Sht.
5
of
6
P11,
U16
D2,
Sht.
5
of
6
PC88
Service
Manual
4-19
Troubleshooting
Activity
\
5
Volts
5
Volts
5
Volts
5
Volts
5
Volts
0
Volts
0
Volts
0
Volts
5
Volts
5
Volts
5
V
olts
5
Volts
5
Volts
5
Volts
5
Volts
5
Volts
High,
low
pulse
25ys
wide
every
1.25ms
Low,
high
pulse
35y1s
wide
every
1.25ms
Square
Wave,
2.5ms
cycle
Square
Wave,
5ms
cycle
Square
Wave,
10ms
cycle
0
Volts
5
Volts
5
Volts
Low,
high
data
bursts
predominately
.6ms
apart
5
Volts
High,
low
pulse
.03us
wide
every
20us

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