Fm Tuner Section Adjustment - Pioneer F-93 Service Manual

6.2 FM TUNER SECTION
• Press the Band Select button to go to the FM mode.
• Press the ANT A/B button to select the antenna terminal with the FM SG output connection.
• Press the RE ATT button to select "OdB" (RE ATT OFF).
• For adjustments without indications, turn "OFF" AUTO OPERATION, MPX NR, SSS, S-MPX and turn the MPX MODE
to "AUTO".
• See page 44 regarding *4 through *10.
Step
No.
Adjustment Title
FM SG (1101z ± TSKHz dew.)
F-93 Indication
Adjustments
Frequency(MHz)
and condition
Level(dBaV)
Adjustment
Point
Specifications
1
Front End VT adjustment No signal
108MHz L18
Adjust the voltage to 20.0±0.1
V between TP-17 and GND.
2
87.5MHz —
Confirm the voltage between
TP-17 and GND is 7.1± 0.6V.
3
Front End sensitivity up
adjustment
90
Low level
*4
90MHz
[NORMALI*6
TI,T2,
T3,T4
Maximizes the voltage between
TP
-
15 and
GND.
4
106 Low level *4
106MHz
[NORMAL)*6
TC1,TC2,
TC3,TC4
5 Repeat steps 3 and 4 to satisfy the requirements.
6
IF section sensitivity
up adjustment
[MONOI*7
98
Low level*5
98MHz
[NORMAL1*6
T101, T102,
T103
Maximize output level of Output
terminal.
7
98MHz
[SUPER NARROVV]*6
T104, T105,
T106
8
Detector VT adjustment
98
[MON0]*7
60
98MHz
[NORMAL[*6
T201-B
Adjust the voltage between TP-
12 and 13 to 0±100mV.
9
' T202-8
Adjust the voltage between TP-
6 and 14 to 0±100mV.
10
T203
Adjust the voltage between TP-
3 and 4 to 0± 100mV.
11
Mono distortion adjustment
[NORMAL)
98
[M0N0J*7
60
98MHz
[NORMAL] *6
T201-A
VR203
Short between TP-1 and 2.
Short between TP-10 and TP-26
(+13V). Minimize distortion
(0.4% or less).
12
T202-A
VR208
Short between TP-1 and 2.
Short between TP-11 and TP-
26 (+13V). Minimize distortion
(0.4% or less).
13
While shorting between TP-1 and 2 (with TP10, 11, 26 open),
if
the distortion value exceeds 0.4%, adjust
T201-B (and T202-B) so that the voltage between TP-12 and 13 (and between TP-6 and 14) is 0±100mV.
Repeat steps 11 and 12 above.
42