Panasonic DVCPRO AJ-CA901P Service Manual page 18

3-1. BS Power Supply Adjustment
BS POWER
BOARD
GND: 78pin (A/B), +: 10pin (A/B) on
TP
Extender Board between BS AUDIO
VR1 [V ADJ] (BS POWER UNIT)
ADJ.
------
INPUT
D.V.M., Extender Board (VFK1671)
M. EQ
10pin A/B = 5.05V ± 0.02V
SPEC.
1. Extend the BS AUDIO Board with the Extender
Board (VFK1671).
2. Connect the digital voltmeter (-) to pin 78A/B and
(+) to pin 10A/B, and then adjust VR1 on the
Power Supply Unit so that the voltage is within the
specification.
3. Connect the digital voltmeter (-) to pin 78A/B and
(+) to the measuring points on the Extender Board
as shown the table below, and make sure that the
voltages at each pins are within the specification.
TP
13pin (A/B)
16pin (A/B)
18pin (A/B)
20pin (A/B)
3-2. OCS Frequency Adjustment
BS AUDIO
BOARD
58pin B on Extender Board between BS
TP
AUDIO
VR300, VR600
ADJ.
------
INPUT
Frequency counter, Oscilloscope,
M. EQ
Extender Board (VFK1671)
Frequency: 3.579545MHz ± 5Hz
SPEC.
Level: 1Vp-p ± 1%
1. Extend the Audio Board with the Extender Board
(VFK1671), and connect the frequency counter to
pin 58B on the Extender Board.
2. Adjust VR300 so that the frequency is within the
specification.
3. Connect the oscilloscope to pin 58B on the
Extender Board, and adjust VR600 so that the
voltage is within the specification.
Specification
D+3.3V = 3.30V 0.15V
±
+12V = 12.00V 0.50V
±
A+5.6V = 5.65V 0.20V
±
A-5.6V = -5.65V 0.20V
±
1Vp-p
4-8. SCH Adjustment
BS AUDIO
BOARD
BS REAR PANEL BNC
TP
ENC1 OUT
VR400 [SCH] (BS AUDIOP.C.Board)
ADJ.
------
INPUT
SCH Meter (With 75 Ω termination)
M. EQ
SCH = 0º ± 10º (Internal Mode)
SPEC.
1. Disconnect any input signal to the GENLOCK
INPUT connector and set the Base Station in the
GENLOCK mode.
2. Connect the SCH meter to the ENC 1 OUTPUT
connector and then adjust VR400 so that the SCH
is within the specification.
ELE-1