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Sect.IV
Page 10
TABLE
4-3,
TROUBLESHOOTING
THE
FEEDBACK
LOOP (CONT'D.)
Model 606A
;
Procedure
Observe or Measure
3.
Repeat for bands 1, 2, 4, 5 and 6
4,
Adjust the 2K variable resistor
until 3.1 vdc appears on pin 7 of
V8 (6AW8A),
Set R63 (ATTEN-
UATOR VERNIER) fully counter-
clockwise (zero ohms).
5.
Turn R63 (ATTENUATOR VERNIER)
fully clockwise (5K).
6.
Disconnect jumper from pin 2 V6 to
-200 volts.
Remove 5K and 2K resistor
7.
Realign the RF Oscillator and Ampli-
have been replaced or altered
Check with data on Table 4-4.
Data for CR2, CR3 and V8 for this test are same
as listed in item 2.
V8 (6AWB8A)
pins 1 & 6
pin
2
pin
3
pin
4
pin
5
pin
7
pin
8
pin
9
V7
(12AT7)
pins 1& 6
pin
2
pin
3
pins
4&5
pin
7
pin
8
pin
9
V8
(6AWBA)
pins 1 & 6
pin
2
pin
3
pin
6
pin
7
N
pin
8
pin
9
Oo
E is approximately
ee
66
ce
sc
ee
sé
6
68
'e
ee
ee
ce
66
ce
66
6E
ee
6c
ee
sé
E is approximately
ce
ce
E is approximately
oe
66
ce
oc
ee
ee
6a
66
ce
+3.9 vde
0
vde
+143
vdec
+19.5
vde
+13
vde
+3.1
vde
+77
vdc
+10 vdc
+295 vde
+74 vdc
+77 vde
+19.5 vde
+135 vde
+143 vde
+13 vde
+4,5 vdc
+3.3 vdc
+138 vdc
+4.5 vde
voltage change as R63 is rotated
E is approximately
¢
6c
ee
€
The unit should be working properly.
+77 vdc
+42 vdc
See section on Max. Carrier Set, Mod. Zero Set,
Output Meters.
fier sections if any tubes or components
Carrier Zero Set, Percentage Mod, and Carrier
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