Hp 3000/9X9Ks And Hp 9000/K2X0/K4X0/Kx70 - HP 3000 9x9KS Service Manual

HP 3000/9x9KS and HP 9000/K2x0/K4x0/Kx70

Front Preparation:
1. Remove the front bezel.
2. Remove the front cover plate.
3. Pull the memory carrier card(s) extractor ring(s) until the memory carrier card(s) is out approximately
one inch.
4. Pull the CPU card(s) out approximately one inch.
5. Pull the Power Monitor out approximately one inch.
6. Loosen the four (two left and two right) captive mounting screws on the peripheral bay. Pull the
extractor levers out and slid the peripheral bay out approximately one inch.
System Board Removal: Refer to Figure 7-27, which shows an example for K4xx/959KS/969KS/979KS
systems.
1. Remove all I/O cards.
2. Remove the Core I/O card.
3. For the HP 9000/K2x0/K4x0/Kx70 only, remove all HP-HSC Expansion I/O cards.
4. Remove the Power Supply.
5. Remove the back cover plate.
6. Remove the CPU card(s).
7. Reach inside the cabinet and loosen the three thumb screws (1) holding the system board in the cabi-
net.
8. Carefully pull the top of the system card toward the rear of the cabinet and lift it out of the cabinet.
9. Transfer the PAL chip (position U30 in Figure 7-29) from the removed system board to the new sys-
tem board (replacement procedure only - not applicable to system upgrades to Kx70).
10. If the original board has an external oscillator, transfer this to the new board.
11. Check the frequency switches for the correct setting.
Figure 7-27 System Board Removal
Removal and Replacement 7-35