Sharp XL 1700 - Executive Microsystem Service Manual page 15

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
"POWER" 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.
• The TUNER TEST2 mode is obtained with >> + MEMORY + POWER. ->Turn off AC in the TEST2 mode to restore the initial
• To clear the whole memory, insert the AC cord, pressing MEMORY + CD PLAY.
3. Preset frequencies for various destinations (random preset memory)
BAND
CH
1 FM 87.50 MHz
2 FM108.00 MHz
3 FM FM 98.00 MHz
4 STEREO FM 90.00 MHz
5 FM106.00 MHz
• The slant line sections of the table store no memory.
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).
If AC OFF state is maintained in this state for about 1/2 day, start is executed in the initial state.
FM
CH BAND
6
7
8 AM
9
10
state.
AM
16-25
AM 522 kHz
AM1620 kHz
26
AM 990 kHz
27
AM 603 kHz
28
AM1404 kHz
29
30
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XL-1700/1700C
FM
CH BAND
FM106.00 MHz
FM 90.00 MHz
FM FM 98.00 MHz
MONO FM108.00 MHz
FM 87.50 MHz