Kenwood HM-901 Service Manual

Contents

R-SE93CIRCUIT DESCRIPTION1. DESTINATION LIST OF TUNER1-1 Destination List of Tuner2. TEST MODE2-1. InitializingThe system is initialized when the power is turned on whilepressing the POWER key.(1) Contents of operationEAll the functions are initialized.2-2. AMP test mode using main unit's keys2-2-1. Entering the AMP test modeETurn on the power while pressing the BAND key.2-2-2. Canceling the AMP test modeE By turning off the power, the system is initialized and thetest mode is canceled.2-2-3. Contents of AMP test mode(1) Automatic POWER ONE The POWER ON state is entered whenever the power isturned on while pressing the BAND key. All functions arethen initialized and activated in the all-lighting mode.ESub-clock oscillation diagnosis functionThe oscillation diagnosis (existence of oscillation andmeasurement of period) of a sub-clock is performedbefore the test mode is entered. If the diagnosis result isOK, the system enters the test mode.If the diagnosis result is NG, the oscillation of the sub-clock is diagnosed again. If the result is OK, the systementers the test mode. If the diagnosis result is continu-ously NG five times, the system stops with ERR 1 andERR 2 displayed.(2) All-lighting modeE All the fluorescent display indicators and LED lamps lightwhen the power is turned on while pressing the BANDkey.E After that, the all-lighting mode is canceled when anymain unit's key is pressed. The normal display obtainedwhen the selector is set to TUNER then appears.(4) OthersE The AMP test mode is not terminated even if the selectoris set to positions other than TUNER.E In the AMP test mode, the muting during mode selectionis not controlled. However, the operation during thepower-on sequence is the same as the normal operation.E The SP protection operation is also the same as the nor-mal operation.E In the AMP test mode using main unit's keys, the keysbelow provide a special operation according to the posi-tion where the selector is set. The main unit's keysexcept described below and the rotary encoder providethe normal operation.(5) When selector is set to TUNERKey OperationPURE A key Increments the P.CALL every time thiskey is pressed.N.B. key Decrement the P.CALL every time thiskey is pressed.ENTER key Selects the display cyclically in the orderbelow every time this key is pressed.@ Write data in the unused area of E2PROM, then read thewritten data. If the read data is the same as the writtendata, "RAM OK" is displayed in the fluorescent displayindicator. If the former is different from the latter, "RAMNG" is displayed.A Set the TUNER ATT to OFF and display the S level inhexadecimal when the ENTER key is pressed. ("ATTOFF **" is displayed in the fluorescent display indicator.)B Set the TUNER ATT to ON and display the S level inhexadecimal when the ENTER key is pressed. ("ATT ON**" is displayed in the fluorescent display indicator.)* The special display using the ENTER key is continued untilthe next operation is carried out. (**: S LEVEL)When keys other than ENTER are pressed in items @ to Babove, the TUNER ATT is set to OFF and the normal displayappears. The operation corresponding to the key that hasbeen pressed is performed in this case.Desti- Receive Channel PLL DIODE SW(X14)nation BAND frequency space 1F reference DSW1 DSW2range frequency D26 D29FM 87.5MHz~ 100kHz +10.7MHz 25kHzK1 108.0MHzAM 530kHz~ 10kHz +450kHz 10kHz1 11700kHzFM 87.5MHz~ 50kHz +10.7MHz 25kHzE1 108.0MHzAM 531kHz~ 9kHz +450kHz 9kHz0 11602kHzFM 87.5MHz~ 50kHz +10.7MHz 25kHzE3 108.0MHz(RDS) AM 531kHz~ 9kHz +450kHz 9kHz1 01602kHzM K2 or E1 is changed the setting "DSW1". X 1(DSW1=1 : K2, 0 = E1)0 : NO DIODE 1 : DIODE X : SWITCHING TRANSISTOR3) CONSTRAINT IDLING CURRENT CHANGEOVER MODEwhen selector is set to positions other than TUNER.[PURE A key] Every time this key is pressed.idling current mode is selected cyclically.î NORMAL(B class)îPURE A(IDLING MID)îPURE A(IDLING HIGH)ìPURE A NORMAL (MIDíîHIGH AUTO CHANGEOVER)IDLING CURRENT MODE DISPLAYPURE A IDLING MID (constraint) PURE A MPURE A IDLING HIGH (constraint) PURE A HPURE A NORMAL MID (less than VOL.10.00) PURE A [ MPURE A NORMAL HIGH (more than VOL.10.01) PURE A [ H