KENWOOD RDM23
Service Manual

3. Tuner Test Mode (TEST 2) 1. Outline of tuner (radio) test mode The tuner test mode is intended to store the adjustment and measurement frequencies in the preset memory CH. When adjusting the tuner section in the production line, adjusting personnel are not required to set frequency. 2. Details of tuner test mode Press the "REW/PRESET DOWN" and "CD PLAY" buttons in POWER OFF state and turn on the power by the use of "ON/ STAND-BY" button to preset and store frequency for adjustment and measurement of destination specified by the AREA terminal in the preset memory CH. However, Ordinary 1 and Ordinary 2 are stored in the destinations (selected by SPAN switching operation) when the test mode is obtained. ("FF " + "MEMORY/SET" KEY SPAN CHANGE) (As for frequencies to be preset and stored for each destination, refer to item 3.) The tuner test mode is started from preset No.1. The operations of test mode are identical with the ordinary operations of TUNER function. FUNCTION switching is invalid. It is necessary to discard the content of preset memory when the tuner test mode is ended; be sure to write "0000" or "1111" bits in the memory to be checked for judging memory error at initial setting and to initialize memory. When the tuner test mode is obtained, the following display lights for one second.

4. Electronic volume Test Mode (TEST 3) When this test mode is obtained, the following display lights for one second.

In this mode, volume is -14 dB (STEP28), BASS/TREBLE is set to 0 (0 dB) and SURROUND mode to OFF, and start-up function to CD, respectively. The button operations in the test mode are the same as those of ordinary operation except volume UP/ DOWN. (1) The display is the same as that of ordinary operation except test mode setting. (2) Unlike the ordinary state, the volume is controlled with the volume UP/DOWN button in accordance with the following three steps. Volume-

� (STEP 0) <-> Volume-14 dB (STEP 23) <-> Volume-0 (STEP 30)

(3) BASS/TREBLE and SURROUND are switched when button is pressed.. 5. Timer test Mode (TEST 4) When this test mode is obtained, the following display lights for one second.

TEST MODE

Set the current time and timer time according to the following procedure to reproduce the timer.
� The TUNER TEST2 mode is obtained with >> + MEMORY + ON/STAND-BY. ->Turn off AC in the TEST2 mode to restore the initial state.

Turn off POWER to protect the memory of TEST2 mode. Turn off POWER again to obtain the ordinary operation while the data is stored in the memory (besides TUNER).

1.Set the current time to 1:00, the timer to ON time 1:05, the function to CD, and volume to STEP 12, respectively. One minute is counted as one second, and the timer is reproduced. The fade-in (when playback is started) is executed at a rate of one step for 1 sec. After completion of fade-in, the fade-out is executed at a rate of one step for 1 sec (WAIT 1 sec inserted). After completion of fade-out, the power is turned off (after WAIT 1 sec), and the mode is shifted to the standby. The display during operation is the same as that of ordinary timer operation. 6. LCD Test Mode (TEST 5) When the LCD test mode is obtained, all the LCD segments are lighted. Then pressing the "PLAY" button switches display as below.

If AC OFF state is maintained in this state for about 1/2 day, start is executed in the initial state. � To clear the whole memory, insert the AC cord, pressing MEMORY + CD PLAY. 3. Preset frequencies for various destinations (random preset memory) CH 1 2 3 4 5 BAND FM FM 87.50 MHz FM108.00 MHz FM 98.00 MHz FM 90.00 MHz FM106.00 MHz CH 6 7 8 9 10 BAND AM AM 522 kHz AM1620 kHz AM 990 kHz AM 603 kHz AM1404 kHz CH 16-25 26 27 28 29 30 BAND FM FM106.00 MHz FM 90.00 MHz FM 98.00 MHz FM108.00 MHz FM 87.50 MHz

Lighting of all segments

Lighting of odd segments

Lighting of even segments

FM STEREO

AM

FM MONO

RD-M23

� The slant line sections of the table store no memory.

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