Test Mode; Adjustment - Kenwood RD-M23 Service Manual

ADJUSTMENT

TUNER SECTION
fL: Low-range frequency
fH: High-range frequency
• AM IF/RF
Signal generator: 400 Hz, 30%, AM modulated
Frequency Frequency Display Setting/ Instrument
Adjusting Connection
Parts
AM IF 450 kHz 1,620 kHz T351 *1
AM Band — 522 kHz (fL): T306 *2
1.1 ± 0.1 V
Coverage
AM 990 kHz 990 kHz (fL): T302 *1
Tracking
*1. Input: Antenna, Output: Speaker Terminal
*2. Input: Input is not connected, Output: TP301
• Setting the Test Mode
Keeping the REW/PRESET DOWN button and CD PLAY
button pressed, turn on ON/STAND-BY. Then, the frequ-
ency is initially set in the memory as shown in Table. Call it
with the REW or FF button to use it for adjustment and check
of tuner circuit.
Preset No. FM Preset No. AM
1 87.50 MHz 6 522 kHz
2 108.00 MHz 7 1,620 kHz
3 98.00 MHz 8 990 kHz
4 90.00 MHz 9 603 kHz
5 106.00 MHz 10 1,404 kHz
• FM Mute Level
Signal generator: 1 kHz, 40 kHz dev., FM modulated
Frequency Display Adjusting Instrument
Parts
Connection
98.00 MHz 98.00 MHz VR351*1 Input: SO301
(30 dBµV) Output: Speaker
Terminal
*1. Adjust so that an output signal appears.
• Check FM VT
Signal generator: 1 kHz, 40 kHz dev., FM modulated
Frequency Display Check Point Instrument
Connection
2.2 V ± 0.7 V
87.5 MHz 87.5 MHz TP301
7.3 V ± 1.0 V
108 MHz 108 MHz TP301

TEST MODE

7. Button input diagnosis Test Mode (TEST 6)
When the test mode is obtained, the following is displayed.
This test mode is intended to check whether all the main unit buttons can be detected. Accordingly, in this test mode, it is checked
whether the "ON/STAND-BY" button was pressed after all the buttons shown below were pressed. If the result is OK, OK is
displayed. If any one of keys was not pressed, an error is displayed. In both cases of OK termination or error termination, the
mode is shifted to the standby mode if the "ON/STAND-BY" button is pressed subsequently.
All models using this type of microcomputer are not always provided with the same buttons. Since the buttons used are different
depending on models, types of buttons to be used are determined by whether RDS, SURROUND, and an electric lid are
available at the initial setting by MODEL port.
The order of buttons to be pressed is not determined. Accordingly, it is checked whether all buttons have been pressed.
1. PU-IN buttons: REW/PRESET DOWN + CD STOP
Since this model is provided with SURROUND (HAVE OR NOT), RDS (HAVE OR NOT), and electric CD lid, the following
10 buttons are detected as all buttons.
PLAY, BASS/TREBLE, FUNCTION, VOLUME UP/DOWN, MEMORY/SET, REW, FF, STOP, CD-OPEN/CLOSE
The OK/NG display of test result is as follows.
8. Electric CD lid Aging Test Mode (TEST 8) (Only for model with electric CD lid)
Outline
OPEN/CLOSE operations of electric CD lid are repeated. The number of repeated times and time period are monitored. If the
lid does not move to the regular position after the specified time, operation is stopped. When an error is detected by [CLID_PRO]
during CLOSE, operation is also stopped.
a. POWER ON for function AUX
CD lid position is checked.
CLOSE position: Operation proceeds to the next process.
Position other than CLOSE: After the lid moves to CLOSE, operation proceeds to the next process.
b. CD lid operation started
OPEN operation
WAIT 1 second
CLOSE operation
WAIT 1 second
c. Operations above are repeated.
Specified monitoring time
OPEN operation: 5 seconds
CLOSE operation: 5 seconds
d. Display
OPEN>CLOSE is counted as 1. I to 59999 are counted; if the count is over
59999, display is returned to 0 to repeat counting.
Display when the lid does not move to the regular position after the specified
time
(Ex: Defective operation occurring in the middle of 1538.)
Highlight display of stop when an error is detected by [CLID-PRO]
(Ex: Defective operation occurring in the middle of 1538.)