Safety Inspection Guide - IBM 6400 series Maintenance Manual

4. Set a Fluke meter (P/N 8496278) or similar device to the lowest
resistance scale. Measure the resistance between the power cable
ground pin and the printer frame: safety ground circuits should measure
0.1 Ohm or less.
5. Install the paper guide assembly (page 235).
AC
POWER
J301
IEC 320
AC POWER
CIRCUIT
BREAKER
Line 1
Line 2 / Neutral
CHASSIS
GND
CMX
Controller Board
Card Cage
Fan
Ret
J106 MSL
+48V
P106 MSL
Platen
+48V
Motor
Paper Motion
+5 V
Detector
Paper Out
+5 V
Detector
Left Ribbon
+5 V
Guide
Left Ribbon
+48V
Motor

Safety Inspection Guide

AC to DC
Power Supply
Board
Ret
J108 HBL
P108 HBL
+8.5V +8.5/+48V
Ret
Shuttle
Assy
Terminator Board
Shuttle Motor
Hammer Bank Board
+24V
Hammer Bank
Fan
Figure 55. Ground Path Diagram
* V3.5 BOARD PIN 1 = N TEMP HI
V4 BOARD PIN 1 = N AC FAIL
P101
1 N TEMP HI *
2 N STBY
+5V
3
+5V
4
+5V RET / LOGIC GND
5
+5V RET / LOGIC GND
6
+5V RET / LOGIC GND
7
8 +5V RET / LOGIC GND
9 +8.5V
10 +8.5V
11 +48V
12 +48V
Point
of
J101 DC POWER Common
Ground
J105 HBP J116 SMD
P105 HBP P116 SMD
Ret
Ret
+48V
Ret
OPERATOR PANEL
J310
P310
Ret
EIA–232–E +5 V
Serial I/O
Parallel
I/O
SHIELD
GND
+5 V Remote
Power
Exhaust
Fan
Cabinet
J107 MSR
models
P107 MSR
only
+48V
Ret
Paper Feed
+48V
Motor
Platen Open
+5 V
Switch
Right Ribbon
+5 V
Guide
Right Ribbon
+48V
Motor
353