Rotel rv c 1 service manual

Page 2

Adjustment of Output Voltage

1. Connect the 13.6-volt DC battery power source to
the power input plug. The output terminals should be
rendered to a non-load condition.

2. At this condition, adjust the Potentiometer VR901 so
that the reading of the DC voltage meter connected
to the output plug pins 4 (+) and 3 (-) indicates 44
volts.

DC/DC CONVERTER

Battery
13.6V

RV-C1

DC METER

Symptoms

A. If No Power Input (Pilot Lamp fails to illuminate).
Possible Cause (1): Poor connection at cigarette lighter
plug.

Remedy: Remove the plug, check to see that the proper
connection is not impaired by rust, corrosion, etc, and
re-connect.

Possible Cause (2): Polarities (+, --l of the power cord
may be reversed (when connections are made directly
to the car battery by cutting off the cigarette lighter
cord).

Remedy: Replace the fuse (8 ampsl,part F001,ifblown.
Part D904 diode, or 0902 capacitor may also be
damaged, so check these parts.

B. Fuse Continues to Blow After Replacement.

Possible Cause (1): Reversed polarities on the power line
(Refer to A-2).

Remedy: Replace the RL-188 coil (185) and all the
power transistors 0902, 903, 904, 905.

Possible Cause (2): Damage to the ferrite core of the
power transistor due to an abnormally high power surge.
Remedy: Replace the RL-188 coil (185) and all the
power transistors 0902, 903, 904, 905.

Possible Cause (3): Use of the speakers rated at 4 ohms
or below at the full power.

Remedy: Replace the speakers with the ones rated at
8v0hms or more (RS-555 speakers are 8-ohms).

Possible Cause (4): Operation of the speakers rated at
4~ohms or less at full power, using non-standard fuse
with a higher value than the rated 8A.

Remedy: Replace all power transistors 0902905.
Possible Cause (5i: The battery output is below the
regular level necessary for proper operation.

Remedy: Use a well-regulated battery with a normal
11-16 volt output.

C. Noise During AM Reception.

Possible Cause: High frequency waves from the nearby
electrical source may cause AM interference.

Remedy: Follow the procedures of locating the RV»C1
as indicated in the Owners Manual. Weak station signals
are particularly susceptible to noise interference.

Repair Parts List

Schematic Part No. Daseription
Location
D001 300414019 Light Emitting Diode with
Bracket SDB-SOSA-RD,
(2-2846 (Red)
F001 341221800 Fuse, Long 8A
J001 648211141 AC Outlet M-7007, C4448
#1
T901 228641154 Coil RL-188
L901 228641147 Coil RL-1S4 Input
L905, 904, 903 228641145 Coil RL-179 Output 300H
L902 228641149 Coil RL-186 Output 200uH
RY901 240111243 Relay,Sub Miniature
G2K-0234 12V
03:: 903' 904 } 301201193 Transistor 2802581 (0) (Y)
0901 301201169 Transistor 2SC18261Y1 (G)
0906 301001142 Transistor 28A9121Rl ($1
0908 300919035 Diode CTU-22R
D909 300919034 Diode CTU»22S
D901, 904, 902 .
906,907 } 300919024 Dlode SR1 K4
0905 300313034 Diode 82-050
D903 300919036 Diode 1SR17-200 (Red)
0904' 905 906 440500965 Capacitor, Ceramic CK 100V,
909, 910 O 05 F
. H
0901 452100832 Capacitor, Mylar, MYSOV,
OJHF (J)
6907 452100932 Capacitor, Mylar, MY 50V,
0.01111: (J1
C903 450220932 Capacitor, Mylar, MY 50V,
0.02m= (J)
0902 404100425 Capacitor, Electrolytic CEO4
RE 25V,1000pF
C911, 912 404470525 Capacitor, Electrolytic CE04
RE 50V,470pF
C908 402100650 Capacitor, Electrolytic CEO4
RE 50v, rouF
R911 562100122 Resistor, Carbon RD%w1K(Jl
R910 562390122 Resistor, Carbon RD M: w
3.9K (J)
R33: 903' 904 } 564050832 Resistor, Carbon RDAw
0.5 ohm (J)
R901 564100032 Resistor, Carbon RD%w
100 ohm (Jl
R908 564120132 Resistor, Carbon RDVzw
1.2K(Jl
R906 558100943 Resistor, Metal Oxide
RSU1W 10 ohm (K)
R912, 913 568220143 Resistor, Metal Oxide
RSU1W 2.2 K (Kl
R909 568180053 Resistor, Metal,0xide
RSU2W 180 ohm (K)
R907 568220953 Resistor, Metal Oxide
RSUZW 22 ohm (Kl
VR901 510502151 Semi Fixed Variable Resistor
KVSF10-7SNB-1 K
138011300 Bonnet, Chassis 2MH-1A
648211144 Fuse Holder FH-032, C-1574
6752011 14 Cord Stopper (SR-4N4
675201115 Cord Stopper SR-6W-1
628111161 4P Plug AC4P-4,C-3079
628111164 Plug Assy, Cigar Lighter,
C6143
141810891 Printed Circuit Board
Assy X318
127012233 Heat Sink 3MH-4A
127012206 Sub. Plate, Heat Sink

4LJ-37#2