Abgleichvorschriften / Adjustment Procedures
Vertiga UMS 5100
2 - 2
GRUNDIG Service
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
,
522kHz
;
Digital Voltmeter
to
Testpoint
B
.
AM
;
Couple
Signal Generator
via
Loop Antennas
;
Ue > 50dB
µ
V; f
mod
= 1kHz;
Oscilloscope
to
Loudspreaker Output
.
FM
;
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
L6
a
for
Maximum
.
Adjust with
L8
b
for
1.3V
±
0.1V
.
Check for
8.0V
±
0.2V
at
1620MHz
.
Adjust alternating with
L7
c
at
612kHz
and with
CT3
d
at
1404kHz
for
AF Maximum
.
Adjust with
IF Filter
e
for
Distortion Minimum
.
Adjust with
T2
g
(
left channel
) and with
T1
f
(
right
channel)
for
AF Minimum
.
Alignment Layout
