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
1.
Same as step
1.
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
1.
Same as step
1.
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
1.
Same as step
1.
Adjust
Pvc(C3) to
get Max.output
at 1400KHz
6. 600KHz Same as Step 2. Same as step
1.
Same as step
1.
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
1.
Same as step
1.
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
1.
Same as Step
1.
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
1.
Same as Step
1.
Adjust L607 to
get Max.Output
at 90MHz
Tune P.V.C.to
90MHz.
6. 106MHz Same as Step 2. Same as Step
1.
Same as sStep
1.
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
loading.
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
2.
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
1.
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
NO
. ITEMS Measurement Conditions UNIT NOMINAL LIMIT
Frequency Range
Manual LOW END KHz 525 ±10
HIGH END KHz 1650 ±30
LOW END KHz / /
1
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
NO
. 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
n
DC Bias;% 6 10

BAND•FM/EUROPE
NO
. ITEMS Measurement Conditions UNIT NOMINAL LIMIT
Frequency Range
Manual Low End
High
End
MHz
MHz 87.5 108.5 +0.5 +0.5
1
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
dB
dB
dB
12
12
12
20
20
20
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
dB
dB
16
16
16
25
25
25
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
NO
. 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
z
dB
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
NO
. 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
L: 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