Panasonic WJ-HD500 Service Manual page 13

4. Adjustment Procedure
Refer to the Location of the Test Points and
8
Adjusting Controls on the page 11.
3 Power Board
(1). +5V Adjustment
Test Point: TP16 (+5V)
Adjust: VR2 (+5V)
8 Turn on the power.
8
Connect the Digital Voltmeter to TP16.
8
Adjust VR2 to obtain 5.05 ± 0.05 V.
3 Main Board
(2). Real Time Clock Frequency Adjustment
Test Point: TP21 (REAL TIME CLK)
Adjust: CT21 (REAL TIME CLK)
8
Connect the Frequency Counter to TP21.
8
Adjust CT21 to obtain 32768.5 ± 0.03 Hz.
Note: This Adjustment should be done within 2 minutes
after turning on the power.
(3). Frame Memory Controller Frequency Adjustment
Test Point: TP801 (FRAME MEMORY CLK) Main Board
Adjust: CT801 (FRAME MEMORY CLK) Main Board
8
Connect the Frequency Counter to TP801.
8
Adjust CT801 to obtain 27 MHz ± 100 Hz.
(4). Audio PLL Adjustment
Test Point: TP802 (PLL)
Adjust: CT802 (PLL)
8 Connect the Digital Voltmeter to TP802.
8 Adjust CT802 to obtain 1.65 ± 0.1 V.
(5). Multiscreen Output Level Adjustment
Test Point: Multiscreen Output Connector Rear Panel
Adjust: VR751 (MULTI OUT)
8
Connect the terminated Oscilloscope with 75Ω to the
Multiscreen Output Connector.
8 Adjust VR751 so that the H-Sync Level becomes 300 ± 15
mV as shown in Fig. 4-1.
Main Board
Power Board
(6). Record Output Level Adjustment
Test Point:
Adjust:
8 Supply the Colour Bar signal to the Video Input Connector
1.
8
Set the position of the SW11 on the Main Board to SUB
side.
Connect the terminated Oscilloscope with 75 Ω to Spot
8
Main Board
Output Connector.
Main Board
8
Adjust VR701 so that the H-Sync Level becomes 300 ± 15
mV as shown in Fig. 4-1.
(7). Decoder Clamp Level Adjustment
Test Point:
Adjust:
8 Connect the Digital Voltmeter to TP601.
8 Adjust VR551 to obtain 0.60 ± 0.02 V.
8
Change the connection of the Digital Voltmeter to TP602.
Main Board
8
Adjust VR601 to obtain 0.60 ± 0.02 V.
Main Board
8
Change the connection of the Digital Voltmeter to TP603.
8
Adjust VR651 to obtain 0.60 ± 0.02 V.
3 Analog Board
(8). Decoder 1 and 2 Input Level Adjustment
Main Board
Test Point:
Adjust:
8
Supply the Stairstep signal (5 Steps, Chroma off) to the
Video Input Connector 1.
8
Confirm the Position of SW11 on Main Board is SUB side.
8 Connect the terminated Oscilloscope with 75Ω to the Spot
Output Connector.
– 9 –
Fig 4-1
Spot Output Connector
VR701 (REC OUT)
TP601 (CLAMP-1)
TP602 (CLAMP-2)
TP603 (CLAMP-3)
VR551 (CLAMP-1)
VR601 (CLAMP-2)
VR651 (CLAMP-3)
Spot Output Connector
VR611 (DECODER-1)
VR621 (DECODER-2)
300 ±15 mV
Rear Panel
Main Board
Main Board
Main Board
Main Board
Main Board
Main Board
Main Board
Rear Panel
Analog Board
Analog Board