Bose Life CD5 Series I Service Manual page 54

Product: Lifestyle
Subject: Dim VFD Display
Effective Date: 8/27/96
Symptom: Dim VFD Display.
Reason: Improper voltage rating on C19.
Solution: Replace C19 with a 33uF, 63V capacitor, part number 149948-3301J.
The display dims on some units, after the unit has been in use for a period of time. When a
unit is returned from the field for service, C19 should be checked to ensure that the voltage
rating on C19 is 63V. If it is not, it should be replaced with a 33uF, 63V capacitor, part
number 149948-3301J. This should be done to all units returned for service to ensure this
failure does not occur in the future. Refer to the schematic below, the CD5 service manual,
part number 174798, and the CD5 supplement, part number 177871, for schematics, PCB
layouts and disassembly procedures.
R6
10,1W
NOTE 24
214
J7-2
558
C14
100/25V
D7
1N4004
C19
33/63V
Date issued: 6/17/97
®
CD5
D4
229
1N4004
-24V
D8
R9
231 232
220
1/4W
1N4004
100/50V
C15
M
M
8
CD5 Power Supply
174798-B1
+5V
NOTE 24
R19
220,1W
+5V
LM78M05CT
1
3
VR3
2
C11
1000/16V
D
D D
1N5239
D10
233
R10
120,1/4W
9.1V
24V
100/25V
1N5252
100/50V
C17
D9 C16
M M M
53
J7-12
+5V
1
F
538
C12
10/50V
2
-15V
100/25V
TO VFD
C18
SHT 2
M
4.5VAC