Installation guide

Troubleshooting
Troubleshooting Assembly Level Problems
1-26
Table 1-14
A23 Motherboard test points for:
MB LED
-6 VF
ab
Filtered
-6
a. MB LED means that an LED for this power supply is visible from the top-side of the A23 Motherboard.
b. The voltage for this power supply is filtered on the A23 Motherboard.
-15 VF
b
Filtered
-15
MB LED
-5.2
VF
ab
Filtered
-5.2
+15
STBY
+15
STBY
LCD
c
Filtered
+15.2
STBY
c. The voltage for this power supply is generated by filtering the +15_STBY on the A23 Motherboard.
+5.2 VD
LCD
b
Filtered
+5.2 VD
Fan
+8.5 to
+12 Vdc
A2 Display J32-12
A3 Front Panel Auxilary Board J30-31 J30-32
A6 Power Supply J28-38 J28-23 J28-21,
40
J28-34
Top-SLOT 1
d
A7 Baseband Generator (Option 001 or Option 002)
d. Top-Slot numbers one through five (where one is on the left) refer to the position of an assembly in the top card-cage of the signal generator
when viewed from the top.
J11-3 J11-1, 26
Top-SLOT 2
A9 Digital Demodulator (Option 501, 502, 503, 504 with
Option 300)
J12-3 J12-1, 26
Top-SLOT 3
A10 I/Q Multiplexer
J13-3 J13-1, 26
Top-SLOT 4
A11 Internal Bit Error Rate Analyzer (Option UN7)
J14-3 J14-1, 26
Top-SLOT 5
A12 CPU
J15-57 J15-43 J15-101 J15-102
A19 Daughterboard J10-37,
87
J10-36,
86
J10-35,
85
J10-33
A20 Downconverter (Option 501, 502, 503, 504 with
Option 300)
A21 YTO Driver (Option UNJ or Option 506)
A25 Rear Panel Board
or A26 Rear Panel LVDS Board (Option 1EM)
and A27 Rear Panel SMB Board (Option 1EM)
AT1 Electronic Attenuator (Option 501, 502, 503, 504 or
Option UNJ)
or AT1 High-Power Mechanical Attenuator (Option UNB)
and A28 Reverse Power Protection
(Option 501, 502, 503, 504 or Option UNJ)
B1 Power Supply Fan J33-1
B2 Small Fan J27-1
B3 Daughterboard/Card Cage Fan J29-1