Panasonic RC-Q500 Bedienungsanleitung

OrderNo. MD0005083C2

FM-LWDigital Clock Radio

RC-Q500

Colour

(S)..........SilverType

EP....East Europe

SPECIFICATIONS

RADIO

FrequencyRange

FM 65-108 MHz

LW 148.5-285 kHz

IntermediateFrequency

LW 459 kHz

FM 10.7MHz

Sensitivity

FM 15 dB/50 mW

LW 56 dB/m/50 mW

GENERAL

Power requirement

AC 230 -240 V, 50 Hz

Power consumption 5W

Memoryback-up batteryfor

clock 9V(6F22/6LR61, S-006P)

Power output 300 mW(RMS...Max.)

Speakers 8cm (16 )

Dimensions(WxHxD) 231 x60 x153 mm

Weight 689 g withoutbatteries

Notes:

1. Weight and dimensionsshownareapproximate.

2. Design and specificationsaresubject to changewithout notice.

Unauthorizedcopying and distribution isaviolation oflaw.

1. Operation Checks and MainComponent

ReplacementProcedures

“ATTENTION SERVICER”

Some chassis components maybe have sharpedges. Be careful whendiassembling and

servicing.

1. Thissection describes theprocedures for checking theoperation

ofthemajor printedcircuitboardsand replacing themain

components.

2. For assemblyafteroperation checks or replacement, reverse the

respectiveprocedures.

Special reassemblyprocedures aredescribedonlywhenrequired.

3. Select itemsfrom thefollowing index whenchecks or

replacementarerequirements.

-Checking Procedurefor eachmajor P.C.B.

...................................................................................................... P.g. 2

-Howtoset adial pointer

.....................................................................................................................

P.g. 3

1.1. Checking Procedurefor eachmajor P.C.B.

Step1 Remove 6 screws.

Step2 Remove the volume knob.

Step3 Remove the top cabinetinthe direction of arrow

Step4 Release the 2 claws inthe direction of arrow.

Step5 Remove CP1 bypressing downthe connector.

Note:Please switchAL1 and AL2 to the left side whenassemble back the set.

1.2. Howtoset adial pointer

Step1 Install the dial pointerand align the pointerto the “0”point as shownabove.

Step2 Install the tuning knob as shownabove.

Note:Turnthe tuning knob to the extreme left wheninstalling.

2. Measurementsand Adjustments

2.1. ALIGNMENTINSTRUCTIONS

READ CAREFULLYBEFOREATTEMPTINGALIGNMENT

1. Setpowersource voltage to 230 VAC.

2. Setvolume control to maximum.

3. Setband switchto FMorLW.

4. Setmode selectorto RADIO.

5. Output of signal generatorshouldbe no higherthannecessaryto obtainanoutput reading.

-AM-IFALIGNMENT

Signal GeneratororSweep

Generator RadioDial Setting Indicator

(Electronic

Voltmeteror

oscilloscope)

Adjustment

(ShowninFig.1)

Remarks

Connections Frequency

Fashion a loop of

several turns of

wire and radiate

signal into loop of

receiver.

455 kHz30%

Mod. at400 Hz Point of non-

interference. (on/

about 150 kHz)

Connectvert.

amp. of scope to

testpoint TP3.

Negative side to

testpoint TP2.

T51 (LWIFT)

Adjust

maximum

output.

-LW-RFALIGNMENT

Signal GeneratororSweepGenerator RadioDial

Setting Indicator

(Electronic

Voltmeteror

oscilloscope)

Adjustment

(ShowninFig.1)

Remarks

Connections Frequency

Fashion a loop of

several turns of

wire and radiate

signal into loop of

receiver.

136 kHz Tuning

capacitorfully

closed.

Connectvert.

amp. of scope to

testpoint TP3.

Negative side to

testpoint TP2.

L54 (LWOSC

Coil)

Adjust

maximum

output.

297 kHz Tuning

capacitorfully

opened.

CT1 (LWOSC

Trimmer)

136 kHz Tune to signal [*1]L55 (LW

ANTCoil)

Adjust

maximum

output.

moving

along

ferrite

297 kHz CT2 (LWANT

Trimmer)

Adjust

maximum

output.

[*1]Fix antenna coil with wax aftercompleting alignment

-FM-IFALIGNMENT

Signal GeneratororSweepGenerator RadioDial

Setting Indicator

(Electronic

Voltmeteror

oscilloscope)

Adjustment(Shown

inFig.1)

Remarks

Connections Frequency

Connectto test

point TP3 through

ceramic capacitor.

Negative side to

testpoint TP2.

10.7 MHz(Sweep) Point of non-

interference.

(on/about 90

MHz)

Connectvert.

amp. of scope to

testpoint TP3.

Negative side to

testpoint TP2.

T50 (FM1st)

Waveform

shown

Fig.2.

T52 (FM2nd)

Waveform

shown

Fig.3.

[*2]Twooutput responses will be present; propertuning is the centerfrequency.

-FM-RFALIGNMENT

Signal GeneratororSweepGenerator RadioDial

Setting Indicator

(Electronic

Voltmeteror

oscilloscope)

Adjustment(Shown

inFig.1)

Remarks

Connections Frequency

Connectto test

point TP18 through

FMdummy

antenna. Negative

side to testpoint

TP2.

63.7 MHz Variable

capacitorfully

closed.

Connectvert.

amp. of scope to

testpoint TP3.

Negative side to

testpoint TP2.

L53 (FMOSC

Coil) [*

for

output.

109.2 MHz Variable

capacitorfully

opened.

CT50-1 (FMOSC

Trimmer)

104 MHz Tune to signal. CT50-2 (FMANT

Trimmer)

[*2]Three output response will be present; propertuning is the outerfrequency.

-BATTERY BACK-UP CIRCUITADJUSTMENT(NOTE:Disconnect AC

powercord)

DC PowerSupply Frequency

Counter Adjustment

Point Remarks

Connections Voltage

(+)

Side...TP5

(-)

Side...TP4

9 V (+)Side...TP9 (-)

Side...TP10 VR1 AdjustVR3 for2400 ±15 Hzon

frequency

counterreading. [*3, 4, 5]

[*3]Connect1 pF capacitorto the test

point TP9.

[*4]Amplifyits output signal byusing AF

Amp.

[*5]Measure the frequency.

-FMDATAMEASUREMENT

Note:The FMIC (Mixer)has to be isolatedfrom the

antenna whendoing FMmeasurement.

1. De-solderedoneconnection of coupling capacitorthat isconnectedto

the antenna

2. Input the signal directlyto the coupling capacitor.

3. Solderback the capacitorafterthe data has beentaken

2.2. AlignmentPoints

3. Type Illustration ofIC’s, Transistors and Diodes

4. Wiring Connection Diagram

5. Terminal Functions ofICs

-IC1(LM8652) Clock LSI

No. Mark I/

OFunction

1~13 Segment

signal output O Output terminals for

segment drive signals

14 Colon output — Not used

15 Vss I Powersupplyinput

16 CR OSC O Outputs anoscillating

signal source necessary

forthe time base during

back-up operation and

operates the time counter.

Alsofunctions as analarm

tone signal (OSC

frequency=2.4 kHz)

17 SPEED/

POWER I Vss forAC operation.

18 DC OUTPUT O Whenradioon signal is

receivedorgenerates at

IC1, this pinwill send a

high signal to the radio+B

voltage control circuit(Q1).

19,20 19...ALARM1

OUTPUT

20...ALARM2

OUTPUT

OOutputs analarmsignal

(“H”level)whenalarm

time matches the current

time. Whenthis pinis

momentarilygrounded

(VDD)the alarmoutput

stops.

21 ALARM

DISPLAY IWhena high signal is

appliedto this pin, the

contents of alarm2 is

displayedand the setting

input is enabled. Whena

lowsignal is applied, the

above applies insteadto

alarm1.

22 TIMESET

INPUT IApplying a signal to this

pincauses the value of the

current time of alarmtime

to increment. Ifthe input

voltage is Vss, the time

decreases. Ifthe input

voltage is VDD, the time

increases. Ifthe input

voltage is a pulse

signal(causedby

depressing the switched

S10), the speedincreases.

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