9600 Service Manual - gmecorp-usa.com

12 Power Distribution
DC POWER DISTRIBUTION PCB
All S/N - Assy. #00-876841 - Sch. #876839
The information for this PCB applies to all system serial numbers. The function of the
DC Power Distribution PCB is to distribute the DC outputs from PS1 throughout the
Workstation. It is located inside the Workstation electronics box in the upper rear corner.
It is accessed by removing the rear cover, the left side cover, the clear plastic protective
shield, and opening the side panel of the electronics box. Outputs from PS1 (+5V, -5V,
+12V, -12V) are input at P9 and distributed as follows:
P1 - Aux Interface PCB, Video Switching PCB, and Image Processor PCB
P2 - AT Motherboard
P3 - Control Panel Processor PCB, and Contrast/Brightness Control PCB
P4 - Hard Drives
P6 - Floppy Drive
P8 - Elapsed Time Meter
U1 monitors the +5V. If the +5V falls below +4.65V the SYSRST* (System Reset) signal
will go low and reset the AT Motherboard. SYSRST* will stay low until the +5V line rises
above +4.7V. U1 is also active at power up/down. Failure of U1 could be indicated by a
recycling of the Workstation boot sequence or lockup of the AT Motherboard during
boot-up.
TEST POINTS
TP1 Ground TP2 +5V TP3 +12V TP4 -12V TP5 -5V
CIRCUIT BREAKERS
Circuit Breakers 1 thru 9 are all 5 Amp, SPST, 250 VAC, horizontal PCB mounted.
CB1 +5 VDC to AT Motherboard
CB2 +12 VDC to AT Motherboard
CB3 +5 VDC to hard drives
CB4 +12 VDC to hard drives
CB5 +5 VDC to floppy drive and hard drives
CB6 +5 VDC to Control Panel Processor PCB and Contrast/Brightness Control PCB
CB7 +12 VDC to floppy drive and elapsed time meter
CB8 +12 VDC to Control Panel Processor PCB, Contrast/Brightness Control PCB, Aux
Interface PCB, Video Switching PCB, and Image Processor PCB
CB9 +5 VDC to Aux Interface PCB, Video Switching PCB, and Image Processor PCB