Maintenance
Manual 21568, Rev. F, March 2008
5.
(A2TP1 OK) A2TP9 high?
No
A2U9, A2U10, or A2U12B bad
Yes
Continue to Step 6
6.
(A2TP9 high) A2TP11 stuck high?
No
A2U7 bad, or the coarse counter A2U1, U5, U6, or U16. Note that
A2TP8 and TP10 check the ICs on the back of the board for RCOs
(Ripple Carry Outs). Note that the RCOs of the counters will glitch
(Ignore pulses less than 50 ns. Adjusting the scope trigger level
generally allows glitch rejection.) A pulse of approximately one clock
width is necessary for the next stage to count.
Yes
A2U10, U12, U1, or U4 Check A2TP16, A2TP5, and A2TP7
5.2.3
INTernal
Internal problems are generally due to trigger problems. A1U9 has a programming peculiarity in
that it requires an 80 ns hold time. A2R12 and A2C25 satisfy that requirement. If the DAC
appears not to program, check A1CR1 before checking the DATA-4 timing or replacing the IC.
1.
Set the trigger level to +20 dBm. Check the voltage at A1TP8. >4 Vdc.
No
A1CR1 A1U6, A1U8, A1R12, or A1C25 bad.
Yes
Continue to Step 2.
2.
Set the trigger level to -30 dBm. Check the voltage at A1TP8. <+0.1 Vdc.
No
A1U6, A1U8, A1R12, or A1C25 bad.
Yes
Continue to Step 3.
3.
Check for pulses (about 4 ±2 V peak) at A1TP6 with 0 dB, 1 kHz repetition rate.
No
Continue to Step 4.
Yes
Go to Step 5.
4.
(A1TP6 bad) J2 pin 13 low?
No
A2U17 or A2R32 bad.
Yes
A1U10, A1U11, A1U6. Check for about 400 ±200 mV pulses at U6 pin
3. If not present, A1U10 is bad. Otherwise, replace A1U11 or A1U6.
5.
Check voltage at A1TP8. Should be about +40 mVdc, about +4 Vdc with trigger level at
+20 dBm, and about 0 Vdc with trigger level at -30 dBm.
No
A1CR1, A1U9, A1U8.
Yes
Check A2TP17 (READY - should be high) and A2TP6. If A2TP6 does
not toggle, replace A2U18. Otherwise, replace A2U4, A2U12, or A2U8.
Содержание 80350A
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