Oki IP-6620 Maintenance Manual page 254

5.5.20 System Error 190x: Power Supply Unit Error
<Description>
Voltage errors are detected when the following power voltages are checked.
X
0 PCB-ASSY-ACT3
1 PCB-ASSY-ACT3
2 PCB-ASSY-ACT3
3 PCB-ASSY-ACT3
5 PCB-ASSY-ACT3
6 PCB-ASSY-ACT3
7 PCB-ASSY-ACT3
8 PCB-ASSY-IPB5-100
9 PCB-ASSY-IPB5-100
A PCB-ASSY-ACT3
* For the details of the power supplies' relationship, see the Appendix 3 Power Supply Schematic Diagram.
<Faulty part>
(1) PCB-ASSY-ACT3
(2) PCB-ASSY-IPB5-100
(3) Power supply unit (24V) (PSU 24V): POWER SUPPLY 24V, MW
(4) Window sensor OKI Data Infotech (interlock switch)
(5) Power supply unit (38V) (PSU 38V): POWER SUPPLY 36V, MW
Note:
If the PSU 38V output is cut, the power of the CPU and the peripheral circuits is also cut on the
PCB-ASSY-IPB5-100, preventing this error from occurring. Therefore the error 190X is rarely caused by
a PSU 38V problem.
Chapter 5 Troubleshooting (Engine Section and USB Controller Section)
Board Power name
P12V
P24V
P24VAR
P24VSF
P38V
P38VAR
P38VAF
P38VAF
P38VCRG
P38ARHCB
OKI Data Infotech Corporation CONFIDENTIAL
Power supply
system
PSU38V  ACT3
－
PSU24V  ACT3
－
PSU24V  ACT3
The power is cut by the interlock
PSU38V  ACT3
－
PSU38V  ACT3
－
PSU38V  ACT3
The power is cut by the interlock
PSU38V  ACT3
－
PSU38V  ACT3 
－
IPB5
PSU38V  ACT3 
The power is cut by the interlock
IPB5
PSU38V  ACT3 
The power is cut by the interlock
HCB1M
Reference
5-95