Kenwood GX-201KEF2, GX-LEF2 Service Manual
6CD/CASSETTE & HEATER CONTROL RECEIVER
GX-201KEF2/LEF2 /REF2/SEF2
SERVICE MANUAL (TENTATIVE)
© 2003-8 CREATED IN JAPAN B53-0087-00 (N) 0
SUBARU GENUINE |
Model |
Model Name |
Parts No. |
Destination |
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GX-201LE |
GX-201LEF2 |
86201AG410 |
Europe (left-hand-drive cars) |
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GX-201RE |
GX-201REF2 |
86201AG310 |
Europe (right-hand-drive cars) |
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GX-201KE |
GX-201KEF2 |
86201AG210 |
Other Areas (right-hand-drive cars) |
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GX-201SE |
GX-201SEF2 |
86201AG510 |
Other Areas (left-hand-drive cars) |
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Panel assy |
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Panel assy |
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GX-201REF2 |
( - )* |
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GX-201LEF2 |
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VOL ADJ |
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VOL ADJ |
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LOAD |
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LOAD |
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CD |
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CD |
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CHR |
BAND |
CHR |
BAND |
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TAPE |
TAPE |
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LOCAL |
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LOCAL |
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DX |
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DX |
ANTI-THEFT SYSETM |
DOLBY B NR |
SCAN |
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DOLBY B NR |
REG |
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SCAN |
REG |
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RDM |
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RDM |
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TUNE |
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TUNE |
TRACK |
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TRACK |
B NR |
B NR |
OFF 
A/C MODE MODE A/C 
OFF
Panel assy |
Panel assy |
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- )* |
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- )* |
GX-201SEF2 |
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GX-201KEF2 |
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SCAN |
LOAD |
LOAD |
SCAN |
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CD |
CD |
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CHR BAND |
CHR BAND |
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TAPE |
TAPE |
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DOLBY B NR |
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DOLBY B NR |
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TUNE |
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TUNE |
TRACK |
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TRACK |
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B NR |
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B NR |
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OFF |
A/C MODE |
MODE A/C |
OFF |
* Part number of panel assy is undecided.
The knobs with numbers larger than 700 on exploded view are not supplied for service parts because it is difficult to apply grease. Please change to panel assy (PA1) when you need repair to the knob.
The 6CD mechanism has not supplied repair parts for each part (for Optical Laser pickup, motor etc). If you need repair to the 6CD mechanism please change to mechanism assy (D40-1170-15).
DC cord for service : E30-3801-15 
Antenna connector replacement cord for service : E30-6255-05
GX-201KEF2/LEF2/REF2/SEF2
CAUTION ON TRANSPORTING
When transporting the unit, 6CD-CH mechanism must be put into the transport mode.
■ How to Achieve the Transport Mode
In order to achieve the transport mode, there should be no disk and the mechanism nor should the mechanism be in the waiting mode for disk loading.*
After displaying [NO DISC], turned off the ACC power source. Keep the BU power source on.
* Non-waiting mode for disk loading
•Non-waiting mode for disk loading means the state where the mechanism is displaying [NO DISC] and where the mechanism shutter is closed.
•In other words, [NO DISC] is displayed 15 seconds after the disk is taken out or when the shutter of the mechanism is closed and [LOAD] key is pressed. (Pressing the [LOAD] key causes the mechanism to enter the waiting and nonwaiting mode alternatively.)
•Pressing other source keys after taking all the disks out, the mechanism shutter closes and it goes into non waiting mode for disk loading. (At this point the display will indicate the source selected and does not display [NO DISC].)
■ Transport Mode Condition
1.Rear Arm condition (This can be confirmed in the condition where the mechanism cover is in place.)
REAR ARM
Fig. 1 Transport mode
2.Center Screw condition (By the external view of the mechanism, it is possible to make judgment on this by the PLATERACK pin position.)
PLATE-RACK PIN
Fig. 3 Transport mode
PLATE-RACK PIN
Fig. 4 Up/Down center screw connection condition
■ The Reason to Put the Mechanism in theTransport Mode
1.Protection of Rear Arm
Putting the mechanism into the transport mode is a protection against the Rear Arm to get deformed from the vibration during transport or sudden fall. Deformity in the Rear Arm may result in loss of strength for holding the disk in place.
2.Protection against error at the time of initial search Putting the mechanism into the transport mode is also a protection against an error or mechanism lock when the power is put on again. When the back up is turned off, platerack pin could move from the vibration during transport or sudden fall.
This would cause the system to go into an error detection of the center screw is not in connection although, in fact, it is in connected condition.
Fig. 2 Waiting mode for disk loading
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GX-201KEF2/LEF2/REF2/SEF2 |
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BLOCK DIAGRAM |
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(X14- ) |
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(X89-254) |
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W1 |
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J1 |
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FM/AM |
IC31 |
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IC21 |
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IC11 |
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IGN |
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ANT |
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6CD SERVO |
CASSETTE |
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BU5V, AUDIO8V, |
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AIR-CONDITIONER |
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AVR |
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AVR |
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LED10V AVR |
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UART |
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X25 |
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COMMUNICATION |
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AM |
FM |
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Q602 |
Q605 |
Q104 |
Q102 |
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Q813 |
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A3 |
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IC12 |
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DC/DC |
DC/DC |
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AM 8V FM 8V |
SW |
Q808 |
Q815 |
J2 |
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AVR |
AVR |
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AVR |
AVR |
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5V |
IGN |
BU DET |
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(2-71, |
FA/AM TUNER |
AM NOISE |
A1 |
A2 |
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DET |
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BU |
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Q807 |
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2-72) |
(FRONT END) |
CANCELLER |
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DC/DC |
DC/DC |
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ONLY |
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ACC DET |
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AUDIO |
HEAT CONTROL |
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ACC |
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IC13, |
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IC22 |
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IC23 |
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IC41 |
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Q802,823,824 |
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14 |
IC21 |
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E-VOL/ |
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Q401,402 |
IC31-34 |
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FRONT |
NAVI |
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POWER |
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ILLM +/- |
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RDS |
SELECTOR |
MUTE |
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FIX-EQ |
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SIGNAL |
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ILLM +/- |
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SW |
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AMP |
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DET |
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PROCESSOR IC |
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REAR |
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Q816 |
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P-ANT |
P-ANT |
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IC81 |
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SP |
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6CD MECHA |
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(X87-3052-70) |
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SYSTEM u-COM |
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J1 |
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DOLBY (IC1) |
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BUS |
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(COMMUNICATION) |
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X81 |
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IC82 |
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BZ81 |
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IC83 |
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BUS |
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OSC |
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CASSETTE |
RESET |
BUZZER |
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BUS I/F |
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(AUDIO) |
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12.582MHz |
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(X25-929) |
MECHA |
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X89 |
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Q24, |
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ED1 |
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IC1 |
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ED2 or ED3 |
25 |
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LED |
AUDIO |
KEY |
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PANEL |
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HEAT CONTROL |
UART |
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ILLUMINATION FL DISPLAY |
MATRIX |
u-COM |
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FL DISPLAY |
I/F |
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LEVEL DIAGRAM |
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ANT |
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FM |
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GX-201KEF2 |
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500mV-rms |
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LEVEL DIFFERENCE OF EACH SAUCE |
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GX-201REF2/LEF2 270mV-rms |
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TUNER |
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(CH 1W OUTPUT) |
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GX-201KEF2 |
GX-201REF2 |
AM |
GX-201KEF2 |
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GX-201REF2/LEF2 |
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FM |
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IC12 |
CD : +6dB |
GX-201LEF2 |
1kHz 30% mod. |
-18dB 1kHz 30% mod. |
-16dB |
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AM : 215mV-rms |
CD : +6dB |
FM |
1kHz 75kHz dev. |
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-6dB 1kHz 40kHz dev. |
-8dB |
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AM/NC |
CS : +8dB CS : +8dB |
CS |
315kHz 0dB |
-16.5dB 315kHz 0dB |
-16.5dB |
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AM |
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CH : +5dB CH : +5dB |
6CD 1kHz 0dB |
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-1dB 1kHz 0dB |
-1dB |
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0dB |
FM : +7dB |
FM : +10.5dB |
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LPF |
AM : +16dB |
AM : +18dB |
CH |
1kHz 0dB |
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0dB 1kHz 0dB |
0dB |
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-7.5dB |
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IC31-34 |
IC41 |
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IC21 |
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IC22 |
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IC23 |
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FIX-EQ |
AMP |
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SELE- |
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FRONT SELECTOR |
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MPX, |
Q401, |
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FRONT |
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CTOR |
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-1.5dB |
402 |
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SP |
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CASSETTE-MECHA |
0dB |
LOUD, |
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+26dB |
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FAD, |
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+7.7dB |
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CS : DOLBY LEVEL300mV-rms |
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E-VOL, |
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MUTE |
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BASS, |
BAL |
-23.8dB |
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-0.5dB |
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IC24 |
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TRE, |
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6CD-MECHA |
ISO |
0dB |
MID |
REAR |
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REAR |
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CD : 1.2V-rms |
-1dB |
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-2.5dB |
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+26dB |
SP |
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EXT-UNIT
CH : 1.2V-rms
NAVI
NAVI : 1.2V-rms
3
GX-201KEF2/LEF2/REF2/SEF2
COMPONENTS DESCRIPTION
● SYNTHESIZER UNIT (X14-694x-xx)
Ref. No. |
Application / Function |
Operation / Condition / Compatibility |
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IC1 |
Cassette mechanism sub-motor IC |
Cassette sub-motor power supply |
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IC11 |
FM diversity IC |
FM diversity switching (Only for GX-201KEF2) |
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IC12 |
AM noise canceller IC |
AM noise canceller |
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IC13 |
2-piece ope-amp |
RDS noise amp (Only for GX-201LEF2/REF2) |
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IC14 |
RDS demodulation IC |
RDS demodulation (Only for GX-201LEF2/REF2) |
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IC21 |
Ope-amp with switch |
CD/Cassette switching |
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IC22 |
Electronic volume |
BASS/MID/TRE, MPX, Mute, Electronic volume |
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IC23 |
Ope-amp with switch |
Audio/NAVI switching |
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IC24 |
2-piece ope-amp |
CD isolation amp, LPF |
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IC31~34 |
4-piece ope-amp |
FIX-EQ |
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IC35 |
2-piece ope-amp |
1/2 VCC output |
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IC41 |
Power amp |
4ch power amp |
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IC81 |
System -com |
System control |
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IC82 |
Reset IC |
System reset detection |
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IC83 |
I2C BUS IC |
F-BUS communication |
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IC84 |
2-piece NOR circuit |
For hard muting |
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IC85 |
EEPROM |
Bug counter-measure |
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IC86,87 |
Inverter circuit |
F-BUS control |
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Q1,2 |
Cassette mechanism main motor power supply switch |
For cassette mechanism main motor |
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Q101 |
Diversity switch |
When turned ON, turns diversity OFF (Only for GX-201KEF2) |
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Q102,103 |
FM power supply switch |
When FM, 8V output |
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Q104,105 |
AM power supply switch |
When AM, 8V output |
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Q106 |
IF count detection |
When detecting IF count, Lo output |
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Q107 |
RDS data buffer |
RDS data buffer output (Only for GX-201LEF2/REF2) |
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Q108 |
S-meter buffer |
S-meter voltage output |
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Q151,152 |
Noise amp |
Noise detection constant switching (Only for GX-201LEF2/REF2) |
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Q153 |
Noise amp |
Noise detection output buffer (Only for GX-201LEF2/REF2) |
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Q202 |
Mute switch |
For muting within electronic volume |
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Q401,402 |
NAVI mute |
For NAVI muting at interruption |
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Q403 |
SVR switch |
For SVR discharging |
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Q404 |
SVR switch |
For SVR discharging at over voltage |
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Q601,602 |
Audio DC/DC power supply switch |
For DC/DC audio |
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Q604,605 |
Heater DC/DC power supply switch |
For DC/DC heater |
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Q606,607 |
DC/DC control switch |
For switching internal frequency |
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Q650 |
Audio DC/DC power supply switch |
For DC/DC audio |
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Q651 |
Heater DC/DC power supply switch |
For DC/DC heater |
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Q801 |
Buzzer switch |
For buzzer |
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4
GX-201KEF2/LEF2/REF2/SEF2
COMPONENTS DESCRIPTION
Ref. No. |
Application / Function |
Operation / Condition / Compatibility |
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Q802 |
Illumination + detection |
For illumination + detection |
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Q803 |
Reset output switch for F-BUS |
When resetting F-BUS, Hi output |
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Q804 |
NAVI mute switch |
When muting NAVI, Hi output |
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Q805 |
IF count detection |
When detecting IF count, Lo output |
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Q806 |
P-ANT circuit control switch |
When tuner, GND electric potential output |
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Q807 |
ACC detection |
When ACC ON detection, Lo output |
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Q808 |
IGN detection |
When IGN ON detection, Lo output |
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Q809 |
SYS_ON current buffer |
When SYS_ON Hi, Lo output |
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Q810 |
Hard reset switch |
When HARD_RESET ON, Lo output |
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Q812 |
BUS_OFF switch |
When F-BUS system OFF, Hi output |
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Q813 |
P-ON5V power supply switch |
For P-ON5V |
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Q815 |
BU detection |
When BU ON, Lo output |
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Q816 |
P-ANT circuit control switch |
When tuner, BU electric potential output |
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Q817,818 |
P-ANT circuit protection |
P-ANT short circuit protection |
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Q820 |
F-BUS mute output |
When mute ON, Hi output |
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Q821 |
BUS_ON detection |
When F-BUS system ON, Hi input |
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Q822 |
BUS_ON switch |
When F-BUS system ON, Hi output |
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Q850,852 |
Illumination - detection switch |
When detecting illumination -, Hi output |
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Q853 |
Illumination - detection switch |
When detecting illumination -, Lo output |
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● SWITCH UNIT (X25-929x-xx)
Ref. No. |
Application / Function |
Operation / Condition / Compatibility |
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IC1 |
Display control -com |
VFD control, Key intake |
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IC3 |
EEPROM |
For bug counter-measures |
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Q1 |
Audio VFD5V switch |
When audio VFD ON, 5V output |
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Q2 |
Audio VFD5V switch |
When audio DC/DC ON, Lo output |
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Q4 |
Heater VFD5V switch |
When heater VFD ON, 5V output |
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Q5 |
Heater VFD5V switch |
When heater DC/DC ON, Lo output |
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Q11 |
F differential indicator power supply switch |
When F-differential indicator ON, 5V output |
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Q12 |
R differential indicator power supply switch |
When R-differential indicator ON, 5V output |
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Q21 |
Multiple-push reset circuit detection |
When detecting REP/RDM, DWN_SEEK, Hi output |
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Q22 |
Multiple-push reset circuit detection |
When resetting by multiple push, Lo output |
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Q23 |
Multiple-push reset circuit detection |
When TONE (BAL/FAD) detected, Lo output |
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Q24 |
Heater UART communication control |
Heater UART communication control (TX) |
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Q25 |
Heater UART communication control |
Heater UART communication control (RX) |
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Q26 |
SW5V power supply switch |
When IGN ON, 5V output |
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Q27 |
Panel illumination switch |
When panel illumination ON, 10V output |
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5
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