HP 3562A Service Manual page 545

MO D E L 3S62A
T, a ble AS-6
• T
LI
b. Mem ory Refresh Timer
• Set up equ ipment as described i n part 3.a above.
• U s i n g an osc i l loscope, check the waveforms at the fol l owing locations:
c. G l obal T i m i ng
• Set up eq u ipment as descri bed in part 3 . a above.
• Using an osc i l l oscope, c heck the fol lowing signals in the global timing c i rcuit
block:
If any of these s i g n a l s are i n correct, check the i n puts ( p i n 1 ) and tapped
outputs of the delay l i nes (U31 1 , U31 2, and U41 1 ) for 2.1 3 M H z square waves.
d. Refresh Add ress Cou nters/Memory Add ress Drivers
• Set up the equ ipment as d i rected i n section 3.a above.
• Check the signatu res i n table A8-7.
Global RAM Signature Analyzer Setup
Signal
Polarity
G round
Clock Negative edge
Stop Negative edge
Start Negative edge
rn on power.
Location Waveform
U405(3) B U S E N 2, table A8-9 #6
1 . 06 MHz squ are wave
U405(5)
1 .06 M H z squ are wave
U404(1 4)
U404(4) 1 1 8 k H z pos itive pu lses
U404(1 1 ) 1 1 8 kHz negative p u l ses
B2 G D S L table A8-9 #5
G DS L ta ble A8-9 #5
G S M P tabl e A8-9 #6
Connection
A8 J 2-1
A8 J 2-3
A8 J 2-4
A8 J 2-5
S E RV I C E
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