Installation guide

Troubleshooting
Troubleshooting Assembly Level Problems
1-25
Table 1-13
A23 Motherboard test points for: MB LED
+3.4
VDF
a
a. MB LED means that an LED for this power supply is visible from the top-side of the A23 Motherboard.
MB LED
+2.6
VD_1
a
b
b. The voltage regulator for this power supply is located on the A23 Motherboard.
MB LED
+2.6
VD_2
ab
Self-Test
Node
+1.8
VD_1
b
c
c. Self-Test Node means that the voltage for this power supply is measured from the analog bus during Self-Test.
Self-Test
Node
+1.8
VD_2
bc
Self-Test
Node
+1.95
VD_1
bc
Self-Test
Node
+1.95
VD_2
bc
A2 Display
A3 Front Panel Auxilary Board
A6 Power Supply J28-1, 2,
5, 6, 9,
10, 51,
52, 55,
56, 59, 60
Top-SLOT 1
A7 Baseband Generator (Option 001 or Option 002)
J1-60,
61, 62,
63, 125,
126, 127,
128
J1-57,
58, 59,
123, 124
J1-55,
56, 120,
121, 122
J1-52,
118
Top-SLOT 2
A9 Digital Demodulator (Option 501, 502, 503, 504 with
Option 300)
J2-60,
61, 62,
63, 125,
126, 127,
128
J2-57,
58, 59,
123, 124
J2-55,
56, 120,
121, 122
J2-52,
118
Top-SLOT 3
A10 I/Q Multiplexer
J3-60,
61, 62,
63, 125,
126, 127,
128
J3-57,
58, 59,
123, 124
Top-SLOT 4
A11 Internal Bit Error Rate Analyzer (Option UN7)
J4-60,
61, 62,
63, 125,
126, 127,
128
J4-57,
58, 59,
123, 124
Top-SLOT 5
A12 CPU
J5-55,
56, 57,
58, 115,
116, 117,
118
A19 Daughterboard
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)
J36-1
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
B2 Small Fan
B3 Daughterboard/Card Cage Fan