IBM 6400 Maintenance Information Manual page 344

Appendix E
Inspect Electrical Parts
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 229).
AC
POWER
J301
IEC 320
AC POWER
CIRCUIT
AC to DC
BREAKER
Power Supply
Line 1
Board
Line 2 / Neutral
CHASSIS
GND
CMX
Controller Board
Card Cage
Fan
Ret
J106 MSL
P106 MSL
+48V
Platen
+48V
Motor
Paper Motion
+5 V
Detector
Paper Out
+5 V
Detector
Left Ribbon
+5 V
Guide
Left Ribbon
+48V
Motor
344
* V3.5 BOARD PIN 1 = N TEMP HI
V4 BOARD PIN 1 = N AC FAIL
P101
1 N TEMP HI *
2 N STBY
3 +5V
4 +5V
+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
Ret
11 +48V
12 +48V
J101 DC POWER
J108 HBL J105 HBP J116 SMD
P108 HBL P105 HBP P116 SMD
+8.5V +8.5/+48V
Ret
Ret
Shuttle
Assy
Terminator Board
+48V
Shuttle Motor
Hammer Bank Board
Ret
+24V
Hammer Bank
Fan
Figure 57. Ground Path Diagram
OPERATOR PANEL
P310
Ret
EIA-232-E
Serial I/O
SHIELD
+5 V Remote
Power
Point
of
Common
Ground
J107 MSR
P107 MSR
+48V
Paper Feed
+48V
Motor
Ret
Platen Open
+5 V
Switch
Right Ribbon
+5 V
Guide
Right Ribbon
+48V
Motor
+5 V
Parallel
I/O
GND
Exhaust
Fan
Cabinet
models
only
Ret