IBM 6400 series Maintenance Manual page 299

CAUTION: <5> Do not remove or replace
the NVRAM. The NVRAM contains a
lithium battery that can explode if it is
replaced incorrectly. NVRAM is replaced
only at the factory.
VCC
4.7K
0.1W
U56
1
3
GND OUT1
2
IN1 OUT2
1
PER LOGIC 3
IN2 OUT3
HIGH 4
EN OUT4
2
Diagnostic Port
7
8
J102
External Power
4.7K
0.1W
1 +
10 F
2
10%
16V
8
0.1 PF
7
20% 1000 PF
6
50V 10%
5
50V
J6
1 NC
2
3 VX DB TXD
4
5
VX DB RXD
6
NC
470 PF
10%
50V
P103/J17
Power Stacker
1
2
3
4
5
6
7
8
L6
9
10
1000 PF
10%
50V
5000HM
Controller, CMX
J9
Online Verifier
1
2
3
4
5
6
VCC
470 PF
NC 470 PF
10%
10%
NC
50V
470 PF 50V
NC
10%
NC
50V
EXT 5V
DB TXD
DB RXD
OLV SYNC
OLV IRQ
PPR STK STAT0
PPR STK STAT1
PPR STK CTL0
PPR STK CTL1
470 PF
10%
50V
470 PF
10%
50V