Panasonic PV-M1348 Service Manual page 49

FM VCO ADJUSTMENT
Purpose:
To set VCO free run frequency.
Symptom of Misadjustment:
Even when stereophony is received, only monaural sound
will be output.
Test Point : Pin 4 of P4201,
TP9201 (TV Stereo C.B.A.)
Adjustment : R9206 (TV Stereo C.B.A.)
Specification: 38.0KHz +/- 50Hz
Input : ----------
Mode : STEREO audio (FM Radio)
Equipment : Frequency Counter,
DVM (Digital Volt Meter)
1. Connect Pin 4 of P4201 to GND.
P4201
8
1
4 pin
Fig. E3-1
2. Connect TP9201 on TV Stereo C.B.A. to GND through a
resistor (3.3k ohm). Then, connect Frequency Counter to
TP9201.
Frequency Counter
3.3kΩ
TP9201
Fig. E3-2
3. Disconnect Connector PK2 on the TV Main C.B.A.
4. Turn the unit "ON."
5. Set to FM Radio mode, and then set to STEREO audio as
follows.
1) Press FM/TV key, and then press AUDIO key on the
remote control.
2) Check the voltage of following pins to confirm that the
unit is in FM Radio STEREO audio mode.
Connector pin
Mode
to be checked
FM radio mode
Pin 25 of P4204
STEREO audio
Pin 2 of P4201
mode
Fig. E3-3
3) If not, turn the unit OFF, and then turn the unit ON.
Then, perform Step 1) and 2) again.
Note:
With disconnecting PK2 on the TV Main C.B.A., OSD is not
be displayed because power is not supplied to TV circuit.
6. Adjust R9206 (FM VCO) so that the frequency is 38.0KHz
+/- 50Hz.
7. After adjustment, turn the unit OFF.
Connect Connector PK2 and remove the GND Wire and
resistor (3.3k ohm) which were connected in step 1 and 2.
(Model: K)
GND
GND
Voltage
Hight (5V)
Open (approx.4V)
2-26
EVR (Electronic Variable Register)
ADJUSTMENT WITH THE REMOTE CONTROL
This unit has electronic technology using I
The following control functions are adjusted by using "On
Screen Displays" and the remote control instead of adjusting
mechanical controls (VR).
Control functions Address
SUB COLOR 00
SUB TINT 01
SUB BRIGHT 02
CONTRAST 03
SUB SHARPNESS 04
R CUT -OFF 05
G CUT -OFF 06
B CUT -OFF 07
G DRIVE 08
B DRIVE 09
SUB CONTRAST 0A
H CENTER 0B
V POSITION 0C
V SIZE 0D
DOT CLOCK 0E
ANR CTL 10
PICTURE CTL 11
1
VV COLOR 12
VV TINT 13
1
14
VV SHARPNESS
15
PG SHIFTER
Bold-faced letters Control functions which need to be adjusted.
Note:
1 After "SUB COLOR/SUB TINT ADJUSTMENT" is
complete, perform as follows.
• Write the same value of SUB COLOR (Address 00) to
VV COLOR (Address 12).
• Write the same value of SUB TINT (Address 01) to VV
TINT (Address 13) .
2 Address is not displayed on the TV screen.
Other Addresses except above are not used.
EVR ADJUSTMENT ITEM
The following Items need to be adjusted for EVR adjustment.
• PG SHIFTER ADJUSTMENT
• OSD CLOCK FREE RUN FREQUENCY ADJUSTMENT
• SUB CONTRAST ADJUSTMENT
• FOCUS, SCREEN, CUT OFF, DRIVE ADJUSTMENT
• SUB COLOR/SUB TINT ADJUSTMENT
• PURITY ADJUSTMENT
• V. HEIGHT/H. POSITION ADJUSTMENT
• WHITE BALANCE ADJUSTMENT
• SUB BRIGHTNESS ADJUSTMENT
HOW TO ENTER EVR ADJUSTMENT MODE
Press and hold STOP, FF, and VOL DOWN buttons on the unit
together over 5 seconds with no cassette inserted.
The adjustment overlay will appear.
Control SUB COLOR
Function
Fig. E4-1
2 C Bus concept.
2
Range Default
C0 – FF, 00 – 3F 00
E0 – FF, 00 – 1F 00
C0 – FF, 00 – 3F F0
C1 – FF, 00 00
E0 – FF, 00 – 1F F0
00 – 7F 1E
00 – FF 3C
00 – FF 3C
00 – 7F 40
00 – 7F 40
00 – 0F 06
00 – 0F 08
00 – 06 00
00 – 7F 40
00 – 7F 34
00 – EF 87
00 – EF 84
C0 – FF, 00 – 3F 00
E0 – FF, 00 – 1F 00
E0 – FF, 00 – 1F E8
01 – FD 80
00
Value to be
adjusted