
1. Low-Voltage Power Supply Adjustments
AlAGDSl
AlA6TP3
AlAGR9
AlA6DS2
/
AlA7TP2
,
AlA7DSl
AlA8DSl
/
’
AlA7DS2
i
AlA7TP3
Figure 3-3.
IF-Display Section Adjustments (SN 3004A and Above)
5. Verify that the -15 V indicator
AlA6DS2
(yellow LED) is lit.
6. Connect the DVM to AlA6TP4. The DVM indication should be
-15.000 f0.050 V dc. The -15 V supply is referenced to the + 15
V supply; therefore, if the -15 V supply is out of tolerance, a
circuit malfunction is indicated.
7. Verify that the + 120 V indicator AlA7DS2 (yellow LED) is lit.
Note
On IF-Display Sections with serial number prefix 3001A and below,
indicator AlA7DS2 is a + 100 V indicator.
8. Connect the DVM to AlA7TP3. The DVM indication should be
+ 120.0 f3.0 V dc. The + 120 V supply is referenced to the + 15
V supply; therefore, if the + 120 V supply is out of tolerance, a
circuit malfunction is indicated.
Note
On IF-Display Sections with serial number prefix 3001A and below,
the DVM indication should be + 100.0 f2.0 V dc.
9. Verify that the
+5.2
V indicator AlA7DSl (yellow LED) is lit.
10. Connect the DVM to AlA7TP2. The DVM indication should be
+5.200
f0.050 V dc. The
+5.2
V supply is referenced to the + 15
V supply; therefore, if the
+5.2
V supply is out of tolerance, a
circuit malfunction is indicated.
Adjustments
3-27
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