Circuit Description - Kenwood KTF-2010 Service Manual

KTF-2010/3010
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1. Test mode
1-1. Test mode with the main unit keys
a) Setting procedure
• While pressing the [P.CALL] key, plug the AC power cord
to the power outlet.
b) Cancellation
• Unplug the AC power cord. The initial setting will take
effect and the test mode will be canceled.
c) Description
Auto POWER ON
• When the AC power cord is plugged while pressing the
[P.CALL] key, the POWER will turn ON and all function
will be at the initial setting.
ALL LED ON mode
• When the AC power cord is plugged while pressing the
[P.CALL] key, all the LEDs will turn ON. Any key opera-
tion on the main unit thereafter will return the LEDs to nor-
mal.
Main unit key validity check
• Whether the main unit's keys are operable (valid) can be
checked. Regarding the keys whose display does not
change when they are used, their display will be made to
change.
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0~9, +10 key operation
• Preset display : "– –" or "01" ~ "09"
When "0" key is pressed, 10 ch is called.
When "1" ~ "9" key is pressed, 1 ch ~ 9 ch is called.
When "+10" key is pressed, "1-" is displayed.
• Preset display : "1 -" or "10" ~ "19"
When "0" key is pressed, 20 ch is called.
When "1" ~ "9" key is pressed, 11 ch ~ 19 ch is called.
When "+10" key is pressed, "2 -" is displayed.
• Preset display : "2 -" or "20" ~ "29"
When "0" key is pressed, 30 ch is called.
When "1" ~ "9" key is pressed, 21 ch ~ 29 ch is called.
When "+10" key is pressed, "3 -" is displayed.
• Preset display : "3 -" or "30" - "39"
When "0" key is pressed, 40 ch is called.
When "1" ~ "9" key is pressed, 31 ch ~ 39 ch is called.
When "+10" key is pressed, "0 -" is displayed.
MUTE signal output
• The MUTE signal is not output.
No Display for FL
• Press the DISPLAY key to turn on/off the segments of the
FL.
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Slide Switch Check
•The FL shows the Serial Code(XS8/SL16) by pressing the
MEMORY key.
.
•The FL shows the Channel Space(100kHz/50kHz) by
pressing the CH. SPACE key.
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CIRCUIT DESCRIPTION

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•The FL shows the normal mode by pressing the key and
the switch except the MEMORY and the Slide switch.
Display ex.
Serial Code Channel Space
XS8(or SL16) 100(or 50)
1-2. Test mode with serial communications
Refer to the test mode serial code table.
a) Setting procedure
• Plug the AC power cord and enter the TEST ON code.
8 bit serial communications
16 bit serial communications
b) Cancellation
• Enter the TEST OFF code (0CFEH) or unplug the AC
power cord.
c) Description
Other operations during the serial test mode
• The main unit's keys will be effective.
• The serial test code can be received even within 1 second
of POWER ON / OFF.
Required operations for the serial test mode
• The serial code for the serial test mode can be used to
check the operation of all circuits.
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• The code entered during the serial test mode will become
valid regardless of the display mode.
• The following functions are available in the serial test
mode.
0 ~ 9, +10
AUTO (AUTO ST. / HI BLEND / MONO)
MEMORY
UP / DOWN (MANUAL SCAN unnecessary)
IF BAND, RF ATT
ACTIVE RECEPTION
ANTENNA A, ANTENNA B, PTY, DISPLAY, ALL LED
ON/OFF
• The MUTE signal is not output. This is for reducing the
input-output switching time during the measurement.
• When a valid serial code for the test mode is received, the
code identical to the code entered will be output.
• For checking the MUTE operation, MUTE has specific
codes.
MUTE ON/OFF
• To switch cyclically, enter the individual serial code. For
example for AUTO STEREO / MONO, enter the two
codes for AUTO STEREO and MONO.
• All the LEDs, turn ON / OFF is cancelled by inputting the
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cancelling code and returned the LEDs to normal.
• All functions (including the test mode) will be initialized.
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9 4 2 8
: 71H
: 0C2FFH
0 5 8 2 9 9 4 2 8
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9 9
9 9