5-11
5.6.2 Power supply checks
Power supply problems can be checked out using Table 5-3.
Drawing reference: Analog Board; 6517-100
WARNING
Some power supply voltages are hazard-
ous. Use caution to avoid electrical
shock that may result in personal injury
or death.
Table 5-3
Power supply checks
Step Item/component
Required condition
Remarks
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
F101 line fuse
Line switch
Line power
Q305, pin 1
U301, pin 1
U302, pin 3
+120VK (VR301 anode)
-120VK (VR302 cathode)
+1200VK (VR303 anode)
-1200VK (VR304 cathode)
+5VB (U408 pin 3)
-5VB (Q401 pin 3)
+25VS (C461 +)
-25VS (C460 -)
+5VS (U207 pin 3)
+220VS (C401 +)
-220VS (C403 -)
+15VS (U206 pin 3)
-15VS (U205 pin 3)
Check continuity
115V/230V as required.
Plugged into live receptacle, power on
+5V, ±5%
+12V, ±5%
-12V, ±5%
110V to 130V
-110V to -130V
1100V to 1300V
-1100V to -1300V
+5V, ±5%
-5V, ±5%
22V to 28V
-22V to -28V
+5V, ±5%
200V to 240V
-200V to -240V
+15V, ±5%
-15V, ±5%
Remove to check
Line voltage selection switch.
Check for correct power up sequence.
Referenced to Common K (U301 pin 2)
Referenced to Common K.
Referenced to Common K.
Referenced to Common K.
Referenced to Common K.
Referenced to Common K.
Referenced to Common K.
Referenced to Common B.
(BGND, U408 pin 2)
Referenced to Common B.
Referenced to Common S.
(SGND, U207 pin 2)
Referenced to Common S.
Referenced to Common S.
Referenced to Common S.
Referenced to Common S.
Referenced to Common S.
Referenced to Common S.