Rotel RX-203 Bedienungsanleitung Seite 22
Troubleshooting
Unit Inoperative
l.
IF the polot
does not light, check the follow
Outlet
(if fitted)
A. If no voltage across:
1. The AC cord may be broken,
2. Connections in the power switch may be faulty.
B. If there is proper voltage across, check the AC fuse
and if the AC fuse
1. Rectifier
D904 or D905 may be shorted, or
2. Capacitor COOI or C002 may be shorted, or
3. Primary
or secondary
transformer
T 001 may be-shorted.
II. If the pilot
lamp does light,
B+ and
B—
A. If no voltage
across:
1. Rectifier
D904 or D905 may be opened, or
2. Secondary
winding •of the power transformer
may be opened.
B. If there is proper voltage across, check the speaker
fuse and
1. If the speaker fuse is blown:
a. Output
circuit
may be shorted, or
b. Speaker
fuse may be worn
2. If the speaker fuse is normal, check the minus
— point of C601 (C602 for R-ch).
a. If there is no signal
1) Transformer
0504 for R-ch) may be faulty,
2) Capacitor
C512 or C602 for
b. If there is a signal
1) IC601
(IC602
Only PHONO Section Inoperative
A. IC401 (IC402 for R-ch) may be faulty, or
B. Capacitor
C403 or C413 (C404 or C414
may be faulty.
Guide
or
is blown:
winding
of the
measure voltage across
(including
speaker system)
out.
0501
or
0503
(0502
or,
C505, C511 or C601 (C506,
R-ch) may
be faulty.
for
R-ch) may
be faulty.
for
Hum and/or
Hum and/or
A.
at AC
set at minimum
t. Transistor
may be faulty,
2. Capacitor
C512, C520 or C522 for
Hum and/or Noise produced only in Phone
B.
1. IC401 (IC402 for R-ch) may be faulty,
2. Capacitor
C416 for R•ch) and C417 may be faulty,
power
3. Resistor
may be faulty.
Radio Section Inoperative
AM is inoperative
A. If there is proper voltage at B2
a. ICIOI
b. Antenna
or L204 may be faulty.
If there is no proper voltage at B2
B.
a. Resistor
b. Capacitor C908 or C909 may be faulty,
c. Transistor
II.
FM is inoperative
If there is proper voltage at B2
A.
1. IC101 or IC301 may be faulty,
2. Coil L 108 or L 109 may be faulty,
3. Transistor
or
or 0302
4. Transistor
5. Capacitor C137 may be faulty.
If there is no proper voltage at B2
B.
1. Transistor
or
2. Capacitor C908 or C909 may be faulty,
3. Resistor R904 may be faulty,
R•ch)
4. Coil L901 may be opened.
At
FM
C.
Mono only
1. VR301 may be miss aligned, or
2. Mode Selector Switch may be faulty,
3. IC301 may be faulty,
4. Transistor
— 22
Noise
Noise produced
with
Q501 or Q503
(Q502
or
C505,
C511,
C519
C403,
C413 or C415 (C404, C414 or
R411 or R415
(R412
may be faulty,
or
Coil LOOI or Coil L201,
R904 or Diode
D903
0901 may be faulty.
0102,
0103,
0104,
may be faulty,
or
0101 may be faulty,
0901 or Diode D903 may be faulty,
Stereo
boardcast,
the
or
0301 or Q302 may be faulty.
Volume
Control
or 0504
for R-ch)
or C521
(C506,
may be faulty.
or
or
or R416
for
R-ch)
L202,
L203
may be faulty,
or
or
or
or
0106 and 0301
or
or
or
Reciver
receives
in
or
