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Macintosh SE Instrukcja Użytkownika

Przeglądaj online lub pobierz Instrukcja Użytkownika dla Części komputerowe Macintosh SE. Mac Plus, analog board schematic and Tech Notes [en] [fr] Instrukcja obsługi

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Classic Mac Tech Docs, v1.1: No warranties expressed or implied. Use at your own risk!
Classic Mac Tech Info ©2000 Thomas H. Lee, rev. April 17, 2002; All rights reserved Page 1 of 18
Classic Mac Tech Info
1.0 Introduction
Except for minor variations, the analog board for the Mac Plus described in this document
is the same as that used in earlier models (the 128K and 512K/512Ke), and contains the
horizontal, vertical, video and power supply circuits. The horizontal and video circuits are
also virtually identical to those used in the SE and SE/30, but the vertical and power sup-
ply circuits are completely different. As will be obvious from the schematics, the vertical
circuit in the classic machines makes sparse use of ICs, so it is a bit “partsy.” However, it is
a reliable design with no history of unusual problems. The power supply, on the other
hand, is notoriously prone to failure, as there is no fan inside the unit (Steve Jobs objected
to the noise, and preferred to risk overheating the machine instead).
2.0 Video Circuit
The video amplifier is a simple shunt-peaked common-emitter amplifier:
FIGURE 1. Video amplifier
IC U2 is a quad open-collector NAND, one gate of which is connected as a simple inverter
to present the video signal to Q7 with the proper polarity (a low at J4-1 corresponds to
white). Resistor R25 is the NAND gate’s pullup resistor. Diodes CR13 and CR14 form a
Baker clamp to prevent saturation of Q7 when driven hard, thereby speeding up response.
Inductor L4 is a shunt peaking element for boosting the high frequency response of the
video amplifier. Diode CR12 is a protection device, clamping the collector of Q7 to a max-
9
10
8
+5V
+30V
+12F
34
2
1
7
6
J2-9
J2-3
J2-1
J2-5
J2-6,7
J2-8
+12-15kV
R25
470
R27
220
Q7
2N3904
CR13
CR14
R14
1k
2W
L4
27µH
CR12
R20
220
L5
27µH
NE2
NE1
C15
C16C17
Note: C15-17 are
0.01µF capacitors
with 1.5kV spark
gaps
J4-1
U2
9” CRT
CR12-14: 1N4150
(similar to 1N914)
From
horizontal
circuit
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Podsumowanie treści

Strona 1 - Classic Mac Tech Info

Classic Mac Tech Docs, v1.1: No warranties expressed or implied. Use at your own risk!Classic Mac Tech Info ©2000 Thomas H. Lee, rev. April 17, 2002;

Strona 2 - 3.0 Horizontal Circuit

Classic Mac Tech Docs, v1.1: No warranties expressed or implied. Use at your own risk!Classic Mac Tech Info ©2000 Thomas H. Lee, rev. April 17, 2002;

Strona 3

Classic Mac Tech Docs, v1.1: No warranties expressed or implied. Use at your own risk!Classic Mac Tech Info ©2000 Thomas H. Lee, rev. April 17, 2002;

Strona 4 - 4.0 Vertical Circuit

Classic Mac Tech Docs, v1.1: No warranties expressed or implied. Use at your own risk!Classic Mac Tech Info ©2000 Thomas H. Lee, rev. April 17, 2002;

Strona 5

Classic Mac Tech Docs, v1.1: No warranties expressed or implied. Use at your own risk!Classic Mac Tech Info ©2000 Thomas H. Lee, rev. April 17, 2002;

Strona 6 - 5.0 Power Supply Circuit

Classic Mac Tech Docs, v1.1: No warranties expressed or implied. Use at your own risk!Classic Mac Tech Info ©2000 Thomas H. Lee, rev. April 17, 2002;

Strona 7

Classic Mac Tech Docs, v1.1: No warranties expressed or implied. Use at your own risk!Classic Mac Tech Info ©2000 Thomas H. Lee, rev. April 17, 2002;

Strona 8

Classic Mac Tech Docs, v1.1: No warranties expressed or implied. Use at your own risk!Classic Mac Tech Info ©2000 Thomas H. Lee, rev. April 17, 2002;

Strona 9

Classic Mac Tech Docs, v1.1: No warranties expressed or implied. Use at your own risk!Classic Mac Tech Info ©2000 Thomas H. Lee, rev. April 17, 2002;

Strona 10 - 6.0 Connectors

Classic Mac Tech Docs, v1.1: No warranties expressed or implied. Use at your own risk!Classic Mac Tech Info ©2000 Thomas H. Lee, rev. April 17, 2002;

Strona 11

Classic Mac Tech Docs, v1.1: No warranties expressed or implied. Use at your own risk!Classic Mac Tech Info ©2000 Thomas H. Lee, rev. April 17, 2002;

Strona 12

Classic Mac Tech Docs, v1.1: No warranties expressed or implied. Use at your own risk!Classic Mac Tech Info ©2000 Thomas H. Lee, rev. April 17, 2002;

Strona 13

Classic Mac Tech Docs, v1.1: No warranties expressed or implied. Use at your own risk!Classic Mac Tech Info ©2000 Thomas H. Lee, rev. April 17, 2002;

Strona 14

Classic Mac Tech Docs, v1.1: No warranties expressed or implied. Use at your own risk!Classic Mac Tech Info ©2000 Thomas H. Lee, rev. April 17, 2002;

Strona 15

Classic Mac Tech Docs, v1.1: No warranties expressed or implied. Use at your own risk!Classic Mac Tech Info ©2000 Thomas H. Lee, rev. April 17, 2002;

Strona 16

Classic Mac Tech Docs, v1.1: No warranties expressed or implied. Use at your own risk!Classic Mac Tech Info ©2000 Thomas H. Lee, rev. April 17, 2002;

Strona 17 - 7.3 Keyboard Repair

Classic Mac Tech Docs, v1.1: No warranties expressed or implied. Use at your own risk!Classic Mac Tech Info ©2000 Thomas H. Lee, rev. April 17, 2002;

Strona 18

Classic Mac Tech Docs, v1.1: No warranties expressed or implied. Use at your own risk!Classic Mac Tech Info ©2000 Thomas H. Lee, rev. April 17, 2002;

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