Goodmans GPS160MPT User manual

Service Manual - GPS160MPT

GPS160MPT

Service Manual - GPS160MPT

AIGNMENT PROCEDURE

AM SECTION

STEP ALIGNMENT FREQ TEST EQUIPMENT SIGNALIN SIGNALOUT ADJUST REMARK

1. IF 455KHz a. MW,IF,Sweep gen with

loop antenna.

b. Alignment

Oscilloscope.

c. Power supply

Let the AM and

coil close to

the gen

antenna

Take out the

signal from U

601

Pin 7

Adjust T603

get Max.

output at

455KHz.

a. Band SW.SW in

MW Position

b. Vol. Control

in Min.

Position.

c. Tune P.V.C to

high end.

2. 1650KHz a. AM,Sweep gen with ant.

b. Alignment

oscilloscope.

c. Power supply.

Same as step

Adjust

Pvc(C4)to get

max.output

at 1650khz

Tune p.v.c. to

high end.

3. 525KHz Same as step 2. Same as step

Same as step

Adjust T 602

get Max.Output

at 525KHz

Tune P.V.C.to low

end.

4. Reapt step 2, 3 until no further improvement can be made.

5. 1400KHz Same as Step 2. Same as step

Same as step

Adjust

Pvc(C3) to

get Max.output

at 1400KHz

6. 600KHz Same as Step 2. Same as step

Same as step

Adjust AM to

get max.output

at 600khz

Tune P.V.C.to

600KHz.

7. Reapt step5, 6and then step2,3,5,6until no further improvement can be made.

FM SECTION

STEP ALIGNMENT FREQ TEST EQUIPMENT SIGNALIN SIGNALOUT ADJUST REMARK

1. IF 10.7MHz a. AM,IF,Sweep gen

b. Alignment

Oscilloscope

c. Power supply

Let the FM and

close to the

gen antenna

Take out the

signal from

U601 Pin 6

Adjust T601

into the fig.

a. Band SW.SW IN

FM Position

b. Vol. Control

in Min.

Position.

c. Tune P.V.C to

high end.

2. 108.5MHz a. FM,Sweep gen with ant.

b. Alignment

Oscilloscope.

c. Power Supply.

Same al step

Same as step

Adjust Pvc(C1)

to get

Max.Output at

108.5MHz

Tune p.v.c. to

high end.

3. 87.5MHz Same as Step 2. Same as Step

Same as Step

Adjust L603o

get Max.Output

at 87.5Mhz

Tune P.V.C.to low

end.

4. Reapt step 2, 3 until no further improvement can be made.

5. 90MHz Same as Step 2. Same as Step

Same as Step

Adjust L607 to

get Max.Output

at 90MHz

Tune P.V.C.to

90MHz.

6. 106MHz Same as Step 2. Same as Step

Same as sStep

Adjust Pvc(C2)

to get

Max.Output at

106MHz

Tune P.V.C.to

106MHz.

7. Reapt step 5 , 6 and then step 2,3,5,6 until no further improvement can be made.

AIGNMENT PROCEDURE

FM STEREO SECTION

STEP ALIGNMENT FREQ TEST EQUIPMENT SIGNALIN SIGNALOUT ADJUST REMARK

1. 98MHz a. FM,stereo singal

generator.

b. Oscilloscope.

c. VTVM

d. Power supply

Inject the RF

stereo left

chnnel signal

directly to

TP1 with 30dB

Signal are

taken out

from Left and

right

channel

audio output

with 4ohm

The stereo LED

must be on.

a. Band SW. In FM

ST.

b. FM stereo

deviation 25KHz

2. 98MHz Same as step 2. Inject the

left chnnel

input signal

with 60dB.

Same as step

The right

channel output

in Min.

Reading on

VTVM.

About-22dB.

a. Set tone control

to flat

position.

b. Set VOL control

to make left

channel output

50mW

3. 98MHz Same as STEP 2. Inject the

right

Same as step

The left

channel

output in Min.

Reading on

VTVM.

about-22dB

Set VOL control to

make right channel

output 50mW.

4. Reapt Step 2,3,4 until both channels are in approximate equal reading and no furthet improvement can be

made and record this reading as channel sepration.

5. 98MHz Same as Step 2 decrease the input signal from the generator until the stereo LED off then

increase the input signal gradually until the led just on record this reading as stereo

lamp on sens.

CD SECTION

STEP ITEM CONDITION CONNECTION OUTPUT

1 RF Signal Play Test Disc

(784 •)

Oscillospe Connect To

RF. Vc Test Point

2 TE Signal Press

Oscillospe Connect To

TE. Vc Test Point

1.5+/-0.2

1.2+/-0.2V

BAND•MW/EUROPE

. ITEMS Measurement Conditions UNIT NOMINAL LIMIT

Frequency Range

Manual LOW END KHz 525 ±10

HIGH END KHz 1650 ±30

LOW END KHz / /

PLL HIGH END

According to FTZ Regulation without AFC

KHz / /

600 KHz dB/m 52 56

2 Maximum Sensitivity(-6dB S/N) 1000 KHz dB/m 52 56

1400 KHz

MOD.=30% Vol Control to MAX. Position Measure Urf for Ref. Output

Power

dB/m 52 56

600 KHz dB/m 60 64

3 Useable Sensitivity 20dB S/N 1000 KHz dB/m 60 64

1400 KHz

MOD. =30% AF=1000Hz Vol Control to Ref. Output Measure Urf

for (S + N)/N=20dB

dB/m 60 64

603 KHz dB/m / /

999 KHz dB/m / /

4 Auto Scanning Stop Sensitivity 1404 KHz

Record MIN. Urf for Auto Tuning Stop

dB/m / /

According to FTZ Regulation without AFC Manual KHz ±10 ±20

5 Dial Calibration Error (Pointer

at Centre of

Silk- Screening Scale) ALL BAND PLL KHz / /

6 Signal to Noise Ratio

(100dB) 1000 KHz Urf=100dB AF =1000Hz MOD. =30% Vol Control to Ref. Output dB 35 30

Input IF=465/455 Signal at 600KHz Point Adjust

High-Frequency/Signal to Let SP Output be MAX. and Distortion Be

MIN.•It is IF Manual KHz 465/455 ±5

7 IF Frequency 600 KHz

PLL KHz / /

8 IF Rejection 600 KHz AF =1000Hz MOD. =30% Input Freq. 465/455KHz IF Adjust Freq. dB 50 40

9 Image Rejection 1400 KHz AF =1000Hz MOD. =30% Input Freq. 1400KHz+2 IF Adjust Freq. dB 40 30

10 Adjacent Channel Attenuation

±10KHz 1000 KHz AF =1000Hz MOD. =30% Ref. Sensitivity 20dB S/N dB 15 10

11 Bandwidth +6dB 1000 KHz MAX. Sens. +6dB Nf •+/- Freq. KHz 5 12

12 AGC Figure of Merit (126

dB) 1000 KHz

Urf=126dB Vol Control to Ref. output Reduce input Level to Let SP

Output be –10dB dB 40 30

13 Whistle Modulation (TWEET) (86

dB) 930/910

KHz Urf=86dB Vol Control to Ref. output unwanted AF change input Freq. dB 15 10

14 Modulation Hum (126

dB) 1000 KHz AC Supply Voltage Urf=126dBVol control to Ref. output unwanted AF dB -40 -35

BAND•MW/EUROPE

. ITEMS Measurement Conditions UNIT NOMINAL LIMIT

15 Random Noise Max Volume ALL BAND Without Signal Blocking Vol Control For MAX. (Rms)m

V 100 500

16 Audio Frequency 6dB (100 dB) 1000 KHz

Urf=100dB AF =Input Measure Lower and Upper Limit 6dB Ref. to

1KHz(0dB)SP 100/2K2 dB 0 +6

17 Distortion (100

dB) 1000 KHz Urf=100dB AF =1000Hz Volume Control to Ref. Output,MOD.=80% % 2 4

18 MAX. Distortion (100

dB) 1000

KHz Urf=100dB AF =1000Hz MOD. =80% Vol MAX. Measure Urf for Ref.

Output Power % 20 30

19 10% THD Output Power (100 dB) 1000

KHz Urf=100dB AF =1000Hz MOD. =80% mW 3000 2600

20 Overload Distortion (126

dB) 1000

KHz Urf=126dB AF =1000Hz Volume Control to Ref. Output % 4 6

21 MAX. Output Power (100 dB) 1000

KHz Urf=100dB AF =1000Hz MOD.=80% Vol MAX. Measure Urf for Ref.

Output Power mW 3500 3200

22 Oscillation Drop Voltage

(120 dB) 600/1400

KHz Urf=100dB AF =1000Hz MOD.=30% DC Supply Voltage Change DC

Voltage V / /

23 AC Operation Voltage Range V / /

Level Urf=100dB AF=1000Hz MOD.= 30% (MTT-112B Volume Control to Ref.

Output) dB / /

Urf=100dB AF=1000Hz MOD.=30% 1000KHz Pilot Volume Control to Ref. Output

AC Bias% / /

24 Record /Play Back Distortio

DC Bias;% 6 10

BAND•FM/EUROPE

. ITEMS Measurement Conditions UNIT NOMINAL LIMIT

Frequency Range

Manual Low End

High

End

MHz

MHz 87.5

108.5 +0.5

+0.5

PLL Low End

High

End

According to FTZ Regulations MHz

MHz /

/ /

2 Maximum Sensitivity

90 MHz

98 MHz

106 MHz

Vol Control to MAX. Position, Mesure Urf for Ref. Output Power

3 Quieting Sensitivity @

30dB S/N 90 MHz

98 MHz

106 MHz

Vol Control to Ref. Output Power, Measure MIN. Urf for (S+N)/N=30dB dB

90 MHz dB / /

98 MHz dB / /

4 Auto Scanning Stop

Sensitivity 106 MHz

Record MIN. Urf for Auto Tuning Stop

dB / /

Pointer at Centre of Silk Screening Scale, Measure Maximum Sensitivity

Manual MHz +0.5 +1

5 Search Frequency Error/Dial

Calibration All

Band

PLL MHz / /

6 Stereo Led Lighting

Sensitivity 98 MHz Input Urf DEV. 67.5KHz+7.5KHz=75KHz 98MHz Pilot ,Measure MIN. Urf for

Switching dB 16 25

7 Channel Separation 98 MHz Input 1mv Urf. MOD. 67.5+7.5=75KHz 98MHz Pilot, R=1KHz L=0 And R=0 L=1KHz, Measure Output

Level R/L And L/R dB 25 22

8 Signal to Noise Ratio 98 MHz Urf=1mV MOD.=22.5KHz 98MHz Pilot, Vol Control to Ref. Output Measure (S+N)/N, Measure With

DC Supply dB 50 40

9 IF Frequency 90 MHz Input Urf=1mV 90MHz,Scan to Lock It Control Vol to Ref.• Frequency to 10.7MHz and

Add Input Urf Level to Ref Output. Adj. Input Urf Frequency When Output Distortion

Is MIN.•Record In Put Frequency MHz 10.7 +0.1

10 IF Rejection Ratio 90MHz MOD.=22.5KHz,Adj. Urf for (S+N)/N=30dB, Measure Ratio of Urf for F1 to IF for The Same Output,

F1=90MHz dB 60 50

11 Image Rejection Ratio 106 MHz

DEV.=22.5KHz,Adj. Urf for (S+N)/N=30dB, Measure Ratio of Urf for F1 To F2= F1+2*I F for The

Same Output, F1=106MHz dB 30 20

12 FM Stereo signal to Noise Ratio 98MHz In put urf.75KHz 98MHz Pilot W/O Signal Adjust to Eixtemal Position dB 45 40

BAND•FM/EUROPE

. ITEMS Measurement Conditions

UNIT NOMINAL LIMIT

13 Limiting Sensitivity 98 MHz Input Urf=1mV Vol Control to Ref. Output Power, Measure MIN. Urf for

Output Decrease -3dB dB 20 30

14 AFC Holding Range (60 dB) 98 MHz Urf=1mV, Measure Range for Output -3dB, Difference to Center

Frequency, Record to outband (+•f)+(-•f) KHz 450 ±100

15 Am Suppression 98 MHz Urf=1mV DEV.=22.5KHz 1KHz Out =Ref. Output, Change to 30% Am Mod. (1KHz),

Measure The Output Level: Ref. Output / Am Mod. Output dB 40 30

16 Modulation Hum 98 MHz Urf=1mV AF =22.5KHz 98MHz Pilot, Vol Control to Ref. Output Measure (S+N)/N,

Measure With AC Supply dB -38 -30

17 Random Noise All Band No Input Vol =MAX. Measure Noise Level (Rms

)mV 100 500

0 +6

18 Frequency Response 98 MHz Urf=1mV Eq= Centre BASS BOOST= OFF Stereo LED OFF

125H

4k 0 +6

19 Distortion 98 MHz Urf=1mV, MOD.=22.5KHz AF=1KHz,Volume Control Vol to Ref. Output,

Measure Distortion % 0.9 2

20 MAX. Distortion 98 MHz Urf=1mV, MOD.=75KHz AF=1KHz,Volume=MAX. Measure Output Power % 20 30

21 10% THD Output Power 98 MHz Urf=1mV

MOD.=75KHz 1KHz, Control Vol to10% THD, Measure Output Power mW 3000 2600

22 Maximum Output Power 75KHz

(60 dB) 98 MHz Urf=1mV MOD.=75KHz 1KHz, Vol= MAX. Measure Output Power mW 3500 3200

23 Overload Distortion 100 mV

(100 dB) 98 MHz Urf=100 mV(100dB) MOD.=75KHz, Vol=Ref. Output % 4 6

24 Oscillation Drop Voltage 90/106 MHz

Urf=1 mV MOD.=22.5KHz, Vol= Ref. Output Measure Limit Low Supply

Osc Stop Voltage V / /

25 Channel Balance ALL BAND Urf=1mV DEV.=22.5KHz Vol = MIN. to MAX. dB / /

Level dB / /

26 Record Playback Urf=1mV DEV.= 22.5KHz VS MTT-112B 1KHz

AC Bias% / /

Distortio

n DC

Bias;% 6 10

1 Tape Speed Normal

High TCC-112 Volume Control to Ref. Output 3000 +3%/-2%

2 Wow & Flutter WTD

WOW

FLUTTER TCC-112 Volume Control to Ref. Output % 0.2

0.2

0.3

0.35

0.3

0.6

±3 ±6

dB 0 0

3 Playback Frequency Response 125 Hz

1 KHz

6.3 KHz TCC-181A Volume Control to Ref. Output Ref. 1KHz=0dB ±3 ±6

/ /

gm/cm / /

4 Cassette Torque Play

Fast Fwd

Rewind / /

5 Signal to Noise Ratio MTT-112B MTT-112B Volume Control to Ref. Output VS NO Signal Tape dB 40 30

7 Track Crosstalk TCC-192 TCC-192 TCC-192 Volume Control to Ref. Output dB 40 30

8 Channel Balance MTT-121N MTT-121N Volume Control to Ref. Output dB 0 3

9 Minimum Volume Hum & Noise Volume Control to MIN.(Rms /P-PV) mV 1 5 3 15

10 Maximum Volume Hum & Noise Volume Control to MAX. (Rms /P-PV) mV 15 60 25 180

11 Maximum Volume Distortion MTT-112B MTT-112B Volume Control to MAX. % 20 28

12 Distortion MTT-118N MTT-118N Volume Control to Ref. Output % 1 3

13 10% THD Output Power SPK MTT-112B MTT-112B Adjust Volume Up Down to Measure 10% THD SP mW 3000 2600

14 Maximum Output Power SPK MTT-112B MTT-112B Volume Control to MAX. mW 3500 3200

15 10% THD Output Power(HP) MTT-112B MTT-112B Volume to MAX. mW 25 20

16 Current Consumption at 10%THD MTT-112B MTT-112B Adjust Volume Up Down to Measure 10% THD SP mA / /

17 Fast Forward/Rewind

Time(C60) Blank Tape C60 SEC 160 180

BAND•FM/EUROPE

. ITEMS Measurement Conditions UNIT NOMINAL LIMIT

BAND•TAPE PLAYBACK

NO. ITEMS Measurement Conditions UNIT NOMINAL LIMIT

S/N MIC I/P S.G. 1KHz X@ MIC SENS. +30dB VS NO

SIGNAL AC BiasdB / /

TCD784 Record/Playback Volume Control to Ref. Output for Pause DC

Bias dB 28 20

THD @ MIC I/P SENS AC Bias% / /

DC Bias% / /

WITH 1KHz BPF AC BiasdB / /

18 Record/Playback

ERASE

RATIO DC BiasdB / /

19 DC Operation Voltage Range DC Supply Voltage Change DC Voltage V / /

20 AC Operation Voltage Range AC 230V % / /

21 Record MIC Sensitivity 1 KHz Input Level In dB Recording /Play to Tape –5dB dB / /

22 Record MIC ALC 1 KHz Input Level In dB Ref. Record MIC Sensitivity +30dB dB / /

125 Hz dB / /

23 Record MIC FREQ 6K3 @ 1KHz MIC MAX. Sens. (-66dB I/P) dB / /

24 Record MIC ALC Recovering

Time 1KHz MIC MAX. Sens./60 S’VS +30dB/ 60 S’VS MAX. Sens. /60 S’

MIC MAX. Sens. Set to dB Recover 90% of Output Time Sec / /

Beat 0 KHz / /

25 AC Bias Oscillation Freq. Beat 1 VTVM +(x10 Probe) Measure the OSC Coil High-END Side KHz / /

Pos 0 Vrms / /

26 AC Bias Voltage Pos 1 Vrms / /

27 MAX. Distortion MTT-112B MT-112B Volume = MAX. Measure Output Power % / /

FM FM Urf=1mV AF=1000Hz MOD.=75KHz 98MHz dB 0 ±3

28 Level Differences to Din

Tape=0 dB

(MTT-112B) VS Set to 0dB AM AM Urf=100dB AF=1000Hz MOD.=80% 1000KHz dB 0 ±3

CD CD 0dB TCD-784 NO.2 dB 0 ±6

BAND•CD PLAYER

NO. ITEMS Measurement Conditions UNIT NOMINAL LIMIT

Interruption: mm 0.7 0.5

Black Dots: mm 0.6 0.4

1 TCD-725 Fingerprints:

Volume Control to MAX. um •75 •65

2 SRC-444A

/ /

TCD-712

Eccentric The 1st Song and OK OK

3 TCD-731

Verticac

Deviation The Last Song Volume Control to MAX.

Total Access Time of Toc SEC. 3-4 5

Intervals Between Songs SEC. 1-2 2

Search Time From The Last

Track to The 1st Track SEC. 6-7 10

MAX. Distortion 1KHz 0dB Volume Control MAX. EQ ON % 20 28

MAX. O/P 1KHz 0dB Volume Control to MAX. mW 3500 3200

10% THD O/P 1KHz 0dB Adjust Volume Up Down to 10% THD O/P mW 3000 2600

Nominal Distortion 1KHz 0dB Volume Control to Ref. Out Up % 0.2 2

Bass Boost ON 100Hz Volume Control to Ref. Out Up dB +8 +5

S/N Ratio 1KHz

R: Ref. TCD-784 Track 7 dB

dB 55

55 45

20 Hz dB -20 -24

100 Hz dB ±3 ±5

1 KHz dB 0 0

10 KHz dB ±3 ±5

Frequency Response

20 KHz

TCD-784 Ref. 1KHz=0dB

Track 2 345 6

dB ±3 -15

Channel Balance dB 2 3

1 KHz 50

dB 50 40

10 KHz L:38 35

4 TCD-784

Channel Separation(Bass

Boost Off)

TCD-784 Track 8 91011 dB R:38 35

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