GRUNDIG Service
Vertiga UMS 5101 CDC
2 - 2
Adjustment Procedures
Tuner
Test equipment:
Sweep / Signal Generator, Distortion Meter, Oscilloscope, Digital Voltmeter
Note:
The frontend is a completely preadjusted module. Only the IF filter must be adjusted to the IF amplifier (Alignment 4).
The values of the tuning voltages are as follows: 87.5MHz = typ. 1.6V; 108MHz = typ. 8.0V.
Adjustment
Preparation
Adjustment Procedure
1. AM IF
2. AM Oscillator
3. AM Band Pass
4. FM IF
5. 19kHz Filter
AM
;
Sweep Generator 450kHz
to
AM Aerial Input
;
Ue > 60dB
µ
V;
Oscilloscope
via 100nF to
Testpoint
A
.
AM
;
Digital Voltmeter
to
Testpoint
B
.
AM
;
Couple
Signal Generator
via
Loop Antennas
;
Ue > 50dB
µ
V; f
mod
= 1kHz;
Oscilloscope
to
Loudspreaker Output
.
FM
;
98,1MHz
;
Signal Generator
to
FM Aerial Input
;
Ue = 20dB
µ
V; f
mod
= 1kHz; Deviation = 75kHz;
Distortion Meter
to
Loudspreaker Outputs
.
FM
;
Signal Generator
to
FM Aerial Input
;
Ue = 50dB
µ
V; f
mod
= 19kHz;
Oscilloscope
to
Loudspreaker Outputs
.
Adjust with
L1
a
for
Maximum
.
Adjust alternating with
L3
b
at
522kHz
for
1.4V
±
0.1V
and with
TC1
c
at
1629kHz
for
8.0V
±
0.2V
.
Adjust alternating with
L2
d
at
612kHz
and with
TC2
e
at
1404kHz
for
AF Maximum
.
Adjust with
IF Filter
f
for
Distortion Minimum
.
Adjust with
L20
g
(
right channel
) and with
L30
h
(
left
channel)
for
AF Minimum
.
Alignment Layout
TC1
AM OSC
L3
AM ANT
L2
TC2
L1
TA2099
Pin 18
Pin 5
IC 1
A
a
e
f
d
b
h
g
c
B
FE450
TUN1
MPX L-CH
L30
L20
LC72136N
LC72136
IC2
MAIN PCB
Summary of Contents for GLL0452
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