KENWOOD CV751
Service Manual

C-V751
CIRCUIT DESCRIPTION
1. Conditions according to the destination
TUNER destination table
RECEIVING DESTINu-COM BAND ATION DESTINATION E/X E3 RDS E4 LW RDS FM AM FREQUENCY RANGE 87.5MHz~108.0MHz 531kHz~1602kHz CHANNEL SPACE 50kHz 9kHz 50kHz 9kHz 9kHz IF PLL TSW4 (22) 0 TUNER SW TSW3 TSW2 (21) (20) 1 0 TSW1 (19) 1

� Sub-clock oscillation diagnosis function The oscillation diagnosis(existence oscillation and measurement of period) of a sub-clock is performed before the test mode is entered. If the diagnosis result is OK, the system is entered the test mode. If the diagnosis result is NG, the oscillation of the subclock diagnosed again. If the result is OK, the system enters the test mode. If the diagnosis result is continuously NG 5 times, the system stops with ERR1 and ERR2 displayed.

+10.7MHz 25kHz +450kHz 9kHz +10.7MHz 25kHz +450kHz 9kHz +450kHz 9kHz

T

FM 87.5MHz~108.0MHz MW 531kHz~1602kHz LW 153kHz~279kHz

0

1

1

0

2. Contents of tuner preset memory
FREQUENCY M.ch 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 E/X T M.ch 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 FM 98.0MHz FM 98.0MHz FM 87.5MHz FM 87.5MHz FM 89.1MHz FM 89.1MHz FM 108.0MHz FM 108.0MHz FM 90.0MHz FM 90.0MHz FM 87.5MHz FM 87.5MHz FM 87.5MHz FM 87.5MHz FM 87.5MHz AM 1602kHz AM 1602kHz AM 1440kHz AM 999kHz AM 999kHz AM 630kHz LW 216kHz AM 1440kHz FM 106.0MHz AM FM FM FM FM AM FM 87.5MHz 98.0MHz 98.5MHz 87.5MHz 990kHz 97.7MHz AM 630kHz FM 106.0MHz 531kHz FM 87.5MHz FM 98.0MHz FM 98.5MHz AM 531kHz AM 990kHz LW 279kHz FREQUENCY E/X AM 531kHz LW FM 87.5MHz LW FM 87.5MHz LW T 270kHz 216kHz 162kHz

3-5 Tuner test mode (When selector is set to TUNER.)
� P.CALL of preset channel. KEYS

OPERATION

FM 87.5MHz FM 87.5MHz FM 87.5MHz FM 87.5MHz FM 87.5MHz LW FM 87.5MHz LW FM 87.5MHz LW FM 87.5MHz LW FM 106.0MHz LW 279kHz 270kHz 216kHz 162kHz 153kHz

Increments the P. CALL every time this key is pressed. Decrements the P. CALL every time [TIMER MODE] this key is pressed. [TIMER SET]
� Selection of P. CALL steps.

FM 87.5MHz FM 87.5MHz FM 87.5MHz FM 87.5MHz FM 87.5MHz FM 87.5MHz FM 87.5MHz LW FM 87.5MHz FM 87.5MHz FM 87.5MHz FM 87.5MHz FM 108.0MHz AM 999kHz 279kHz LW 270kHz LW 216kHz LW 162kHz FM 108.0MHz AM 999kHz LW 216kHz

KEY 10 [DIGITAL REC] 20

OPERATION 30 40 01

531kHz AM

Selects the P.CALL steps cyclically.
� S level indication. Set the TUNER ATT to ON/OFF and display the S level in hexadecimal when the [PTY] key is pressed. � Indication of FL for TA NEWS and TIMER.

3. Test mode
3-1 Entering the test mode
� Turn on the power while pressing the [OPEN/CLOSE] key. � The test mode gets started while the power is turned on after that,all the FLs will light up and the panel opens. � Sub-clock oscillation diagnosis function is entered by pressing the [DIGITAL REC MODE] key in the all FL lighting mode.

KEY [TA/NEWS] [DISPLAY]

FL INDICATION

3-6 AMP test mode
(When the selector is set to positions other then TUNER.) During the test mode, it can be operated in a special manner that is different from an ordinary operation by using the keys on the remote control or the main body, specifically as shown in the following table.
KEYS AUTO FUNCTION or FL INDICATION REMARKS One touch settings. Volume value. Volume value. A.MEMO TIMER MODE Sub mute ON/OFF operation and FL indication.(except for stereo mode) One touch settings.

3-2 Canceling the test mode
The system is initialized and the test mode is canceled when the AC power is turned off.

3-3 Initializing
The system is initialized when the power is turned on while pressing the [ON STANDBY] key.

3-4 Contents of the test mode
� Key operation in all FL lighting mode.

KEYS [AUTO] [A.MEMO]

OPERATION Green LED lights on. Red LED lights on.

� All FL lighting off mode.

KEYS

OPERATION All FL lighting off. Normal indication.

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