Copyright TEL
31/01/96
Substitute EPROM
with known good
unit; is freq.
wrong?
Does freq. up-
date correctly
when supply
toggled off & on?
VCO locked on
wrong freq?
Correct channel
selected?
(switches on
external lines)
Does toggling
each of the 3 LSB
DIP switches
change the freq?
Set correct
channel.
Repair tracks.
Provide new EPROM.
C (Refer to synth. circuit diagram)
D (Refer to synth. & VCO
circuit diagrams)
N
N
N
N
N
Y
Y
Y
Y
Y
Y
Continuity OK
between EPROM &
IC5 on 3 address
& 4 data lines?
Check for edge
transition on
IC5 pin 14 for
3 LSB DIP switch
operation; if wrong,
check C17, C19 & C2,
C4, C6 on EPROM PCB.
Change IC5.
Replace IC5;
synthesiser OK.
Go to B.
Correct DC V
present on Q1 VCO?
Check inductors,
biasing resistors
& Q1.
Loop filter &
components around
integrator op. amp. OK?
Replace if faulty.
N
N
N
Y
Y
Y
Isolate audio
modulation on VCO;
still noisy?
Trace audio fault.
Y
N
Noisy synth;
poor residual FM.
VCO phase locked?
5-15V present on
control line?
Change trimmer;
still noisy?
Change Q1;
still noisy?
Change TCXO;
still noisy?
Change varactors;
still noisy?
Replace VCO
assembly.
Synthesiser OK.
N
N
N
N
Y
Y
Y
Y
Y
Summary of Contents for T830 Series
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Page 243: ...T800 Memory PCB IPN 220 01144 00 Top Side Copyright TEL 31 01 96...
Page 244: ...31 01 96 Copyright TEL T800 Memory PCB IPN 220 01144 00 Bottom Side...
Page 246: ...E2 6 T800 Memory PCB Information M830 00 31 01 96 Copyright TEL...
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Page 251: ...T830 VCO PCB IPN 220 01176 01 Bottom Side Copyright TEL 31 01 96...
Page 252: ...31 01 96 Copyright TEL T830 VCO PCB IPN 220 01176 01 Top Side...
Page 253: ...M830 00 T830 VCO PCB Information E3 7 Copyright TEL 31 01 96 T830 VCO 220 01176 01...
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