Alignment Instructions - AMSTRAD TS80 Service Manual

ALIGNMENT INSTRUCTIONS
Equipment required: VTVM; AM/FM Band SSG; Loop Antenna; AM/FM IF Genoscope; Non Metalic Trimming Tool;
Dummy Load — 470K; Oscilloscope.
AM Alignment
Step FUNCTION SIGNAL IN SIGNAL OUT METHOD REMARKS
1. AM IF Alignment at Inject signal at TP1 from AM IF Connect G'scope at TP4. Adjust IFT 103 and IFT 104 to get 1. Ensure set switched to MW band. -
468KHz. SG. Select 468KHz AS IF. max signal output on 'scope. 2. Vol control max. Tone controlat centre.
3. Sig. input optimumto avoid AGC action.
REPEAT STEP 1 UNTIL NO FURTHER IMPROVEMENT IS OBSERVED.
Connect loop antenna to the Connect VTVM and O'scope | Adjust T101 to obtain max sig. output
ferrite rod. Inject signal from across speaker output via on the meter and 'scope.
AM SSG at 525KHz. 470K dummy load.
Connect loop ant. to the ferrite Connect VTVM and O'scope
rod. [nject sig from AM SSG at across speaker output via
1650KHz. 470K dummy load.
REPEAT STEPS 3 & 4 UNTIL NO FURTHER IMPROVEMENT OBTAINED
Connect loop ant. to the ferrite Connect VTVM and O'scope___—i[ Adjust L104 to obtain max sig. output
rod to inject sig from AM SSG at | across speaker output via on the meter and scope.
470K dummy load.
Connect VTVM and O''scope__| Adjust TC 103 to obtain max sig
output on the meter & scope.
600KHz.
Connect loop ant. on the ferrite
rod to inject sig from AM SSG at | across speaker output via
1400KHz. 470K dummy load.
REPEAT STEPS 6 & 7 UNTIL NO FURTHER IMPROVEMENT
Connect VTVM and O'scope__'| Adjust T102 and L104 to obtain max
across speaker output via sig output on the meter and scope.
470K dummy load.
MW Osc. Alignment at
1650KHz.
MW aerial alignment at
600KHz.
7. MW aerial alignment at
1400KHz.
1. Ensure set tuned to 525KHz.
2. Vol control max. Tone control at centfe.
3. Sig. input optimumto avoid AGC action.
1. Ensure set tuned to 1650KHz.
2. Vol control max. Tone control at centre.
3. Sig. input optimumto avoid AGC action.
MW Osc. Alignment at
525KHz.
Adjust TC 105 to obtain max sig
output on the metez.
1. Ensure set tuned to 6O0KHz.
2. Vol control max. Tone control at centre.
3. Sig. input optimumto avoid AGC action.
1. Ensure set tuned to 1400KHz.
2. Vol control max. Tone control at centre.
3. Sig. input optimumto avoid AGC action.
1. Ensure set switched to LW.
2. Set tuned to 14QKHz
3. Vol contro! max. Tone control at centre.
4. Sig. input optimumto avoid AGC action.
1. Ensure set switched to LW.
2. Vol control max. Tone control at centre.
3. Sig. input optimumto avoid AGC action.
MW & LW alignment now complete.
Ensure all the coils and transformers
are sealed.
1. Ensure set switched to FM.
2. Ensure stereo/mono sw switched
to mono.
3. Sig. input optimumto avoid AGC action.
1. Ensure set switched to FM.
2. Ensure stereo/mono sw switched
to mono.
3. Sig. input optimumto avoid AGC action.
Connect loop ant to ferrite rod.
Inject 140KHz from AM SSG.
LW Osc and aerial
alignment at 140KHz.
Connect loop anit to ferrite rod. Connect VIVM and O'scope {Adjust TC 106 and TC 104 to obtain
Inject 280KHz from AM SSG. across speaker output via max sig output on the meter and
470K dummy load. scope.
REPEAT STEPS 9 & 10 UNTIL NO FURTHER IMPROVEMENT
LW Osc alignment at
280KHz.
FM ALIGNMENT
FM IF alignment at
10.7 MHz.
Adjust T101 to obtain max output on
the scope with a symmetrical 'S'
curve centered at 10.7MHz.
Connect O'scope to TP5.
Inject 10.7MHz signal from
FM IF SSG at TP2.
Adjust T102 to obtain symmetrical
'S' curve.
Inject 10.7MHz signa! from Connect O'scope to TPS.
FM IF SSG at TP2.
FM IF alignment at
10.7MHz.
REPEAT STEPS 1 & 2 UNTIL NO FURTHER IMPROVEMENT
Inject 86.5MHz signal from Connect scope & VTVM Adjust L103 to obtain max output on
FM IF SSG at J101. across dummy load. the meter.
1. Ensure set tuned to 86.5MHz.
2. Ensure stereo/mono sw switched
to mono.
3. Sig. input optimum to avoid AGC action.
1. Ensure set tuned to 109.5MHz.
2. Ensure stereo/mono sw switched
to mono.
3. Sig. input optimum to avoid AGC action.
FM Osc alignment at
86.5MHz.
Adjust TC2 to obtain max output on
the meter.
Connect scope & VTVM
across dummy load.
FM Osc alignment at
109.5MHz.
FM Osc tracking at
90MHz.
FM Osc tracking at 'Inject 106MHz signal from Connect scope & VIVM
106MHz. FM IF SSG at J101. across dummy load.
Inject 109.5MHz signal from
FM IF SSG at J101.
REPEAT STEPS 4 & 5 UNTIL NO FURTHER IMPROVEMENT
Inject SOMHz signal from Connect scope & VTVM Adjust L102 to obtain max output on
FM IF SSG at J101. across dummy load. the meter.
Ensure set tuned to 930MHz, vol max,
tone control to centre sig input
optimum to avoid AGC action.
Ensure set tuned to 106MHz, vol max,
tone control to centre sig input
optimum to avoid AGC action.
REPEAT STEPS 7 & 8 UNTIL NO FURTHER IMPROVEMENT We aD
Set tuned to a strong stereo Monitor stereo beacon. Adjust VR201 to get the st. 1. Ensure set switched to FM.
station. beacon on. 2. Ensure stereo/mono sw to stereo. ©
Adjust TC1 to obtain max output on
the meter.
FM MXP adjustment.
FM alignment now complete.