Adjustment Procedures - Panasonic Quasar Omnivision PV-M1326 Service Manual

Caution: Use an Isolation Transformer (Variable)
Because a Hot Chassis Ground is present in the Switched
Mode Power Supply Circuit, an Isolation Transformer must be
used. Also, in order to have the ability to increase the input
voltage slowly, when troubleshooting this type of Power Supply
Circuit, a variable Isolation Transformer is required.

3. ADJUSTMENT PROCEDURES

These adjustment procedures consist of the following
sections.
1. Servo Section
2. OSD Section
3. TV Stereo Amp & MTS/SAP Section
4. TV Y/C Process, TV Main & CRT Section
SERVO SECTION
HEAD SWITCHING POSITION ADJUSTMENT
(PG SHIFTER)
Purpose:
Determine the Head Switching Point during Playback.
Symptom of Misadjustment:
May cause Head Switching Noise and/or Vertical Jitter in
the picture.
TP ADJ. MODE
TP3001 R6213 SP PLAYBACK
TP6205
TAPE M.EQ.
ALIGNMENT OSCILLOSCOPE
TAPE
(VFMS0001H6)
COLOR BARS
Note:
TP3001 : Video Signal Process Section on the VCR Main
C.B.A. (Model : A,B,C,D,E,F,G,H,I,J,K)
TV Y/C Process Section on the VCR Main
C.B.A. (Model : L)
TP6205 : Video Signal Process Section on the VCR Main
C.B.A.
R6213 : Servo Section on the VCR Main C.B.A.
One Horizontal Line
T
CH1 : TP3001
5V
1V
Fig. E4
INPUT
SPEC.
T=6±1H
(0.38±0.06msec)
Eq Pulse
Start of V Sync
CH2 : TP6205
0.1ms 2
OSD SECTION
OSD CLOCK FREE RUN FREQUENCY
ADJUSTMENT
Purpose:
To set the OSD clock free run frequency.
Symptom of Misadjustment:
May make it so that on-screen and closed caption display do
not appear.
TP ADJ. MODE
TP3301 R3368 STOP
TAPE M.EQ.
DVM (DIGITAL VOLT METER)
NTSC VIDEO PATTERN
GENERATOR
Note :
TP3301, R3368 : OSD Section on the VCR Main C.B.A.
1. Supply any video signal, such as color bar, to Antenna
Input Terminal or Video Input Jack.
2. Connect the DVM (Digital Volt Meter) to TP3301.
3. Adjust R3368 (OSD CLOCK FREE RUN FREQUENCY)
so that the voltage is 2.5 ± 0.1VDC.
TV STEREO AMP & MTA/SAP SECTION
Model : K,L
SEPARATION ADJUSTMENT
Purpose:
To separate the L and R Channels of Stereo Signal.
Symptom of Misadjustment:
The L and R Channels of Stereo Signal will not be separated
properly resulting in no stereophonic effect.
Model : K
TP ADJ. MODE
TP4901 R4901 STOP (ANTENNA INPUT TERMINAL)
TAPE M.EQ.
OSCILLOSCOPE
MTS/SAP SIGNAL
GENERATOR
Note :
TP4901, R4901 : TV Stereo Amp C.B.A.
2-31
INPUT
(Antenna Input Terminal
or Video Input Jack)
Any video signal such
as color bar
SPEC.
2.5 ± 0.1VDC
INPUT
MTS (ONLY L CH)
300Hz±5Hz
14% or 7% Modulating
SPEC.
Refer to Descriptions
below