Philips PM 5101 Manual page 17

17
- If
adjustment is neeessary, the eap of th e dial should be removed
and the dial nut unserewed.
- Set R18
tO
the middle position and turn the shaft of potentio ­
meter Rl until the frequeney lies within the required toleranee.
- Nex t, tighten the nut of the dial without turning either the
potentlOmeter or the dial shaft.
2. Electrical check
- Adjust the hair-line to 100.
- Set SK3
to
position
" 'V"
and SK2
tO
position"
X
100".
- Cheek that the frequeney amounts
tO
10
kels ±
2
%
(heterodyne
method:'
If
required, adjust with R18.
- Adjust the hair-line
tO
10.
- Cheek that the frequeney amounts
tO
1
kel s ±
2
%.
- If
required, readjust R18 until the deviation of both frequeneies
is less than 2
%.
Adjust SK2
tO
position"
X
1 k".
- Set the hair-line
tO
10.
- Cheek that the frequency amounts
tO
10
kels ±
2
%.
If
neees­
sary, adjust with C22.
- Adjust the hair-line
tO
100.
- Cheek that the frequene y amounts
tO
100
kel s ±
2
%.
If
neees­
sary, adjust with Cl.
- Cheek the frequeney inaecuraey in eaeh frequeney range at
points lO, 25 , 40, 70 and 100 of the frequeney seale. Toleranee:
±
3
%,
± 7
els.
C.
DISTORnON
Set switeh
" 'VI '\, "
(SK3)
tO
posmon
" ev".
The distortion should
be less than 0.7
%
at 20
el s
and 100
kels ,
and smaller th an 0.3
%
at 1
kel s
(measured at a supply voltage of 14 V=).
If
required,
seleet a different value for R4.
D. AMPLITUDE
- Set R2
tO
2.0 V.
- Set SK3
tO
position
" 'V"
- Cheek that the output voltage at BU1-BU2 amounts
tO
2 V
r ms
at all frequeneies.
- If
neeessary, adjust with R26.
- Set SK3 to position" ' \ , ".