Manual for GY-DV500U/GY-DV500E

Manual for GY-DV500U/GY-DV500E

Brand: JVC

Category: Camcorder

Document Type: Manual

Language: EN

Uploaded: Aug. 10, 2025, 12:37 a.m.

Manual Publish Date: 1999-11-01

Precautions during Servicing

When servicing the unit, follow these precautions:

  • Comply with cautionary notices in operation and service manuals.
  • Replace parts with specified numbers, especially those critical for safety.
  • Use specified wiring and insulating materials.
  • Ensure secure wire connections before soldering.
  • Check that wires do not contact heat-producing or sharp-edged parts.
  • Verify power cord security (10-15 kg force).
  • Check areas surrounding repaired locations.
  • For CRT products, use only specified parts to maintain X-ray emission standards.
  • When replacing power transformer connections, use proper crimp-type connectors and tools.

Safety Check after Servicing

After servicing, perform these tests:

  • Insulation resistance test
  • Dielectric strength test
  • Clearance distance verification
  • Leakage current test
  • Grounding impedance test (Class I models)

Refer to the tables for specific values.

Troubleshooting and error codes

No.ItemMeasuring instruments & Input signalsModeMeasuring point() Adjustment parts (1) Adjustment level (☆)Adjustment procedure
1PB switching point adjustment• Alignment tape MC-1, color barPBHID SPA
126 ± 10με		Automatic adjustment
Adjustment is performed automatically so that the timings of HID and SPA signals are as shown below.
(1) Click [PB Switching Point (Auto)].
(2) Click [OK] to start automatic adjustment.
(3) Message "Complete" is displayed when the adjustment has completed successfully. If it is unsuccessful, the message "Adjustment failed" is displayed; try adjustment again.
1REC current adjustment• Internal Color bars (100%)
• Oscilloscope		RECTP REC MON (connector cable)
6Ch
☆440 ± 20 mVp-p		Note: Connect TP to the section indicated [REC MON] on the jig connector in advance.
(1) Click [REC Current].
(2) Click the [OK] button.
(3) Adjust "New value" (address "6Ch") so that the level becomes the adjustment level.
(4) After adjustment, click the "v" marking and set the power button of the set to OFF.
2VCO center frequency adjustment• Internal Color bars (100%)
• Digital voltmeter		REC
↓
PB		TP VCO DC (connector cable)
6Ah
☆1.925 ± 0.025 V		(1) Click [VCO Center Frequency].
(2) Click the [OK] button.
(3) Play the tape section containing color bars.
(4) Adjust "New value" (address "6Ah") so that the level becomes the adjustment level.
(5) After adjustment, click the "v" marking and set the power button of the set to OFF.
3PB EQ (Error rate) adjustment• Internal color bars (100%)
•PC		REC
↓
PB
• VITERBI: OFF		PC monitor
68 h, 69h, 67h, 6Bh, 63h, 64h
Minimize error rate (Total less than 1000, and less than 500 at each channels)		Notes: Use a new tape or non-used section of tape in this adjustment.
• Be sure to clean the head before this adjustment.
• It takes about 1 second from the data change to its reflection in the error rate.
• Also measure the error rate after the "Sync Block" monitor has become perfectly OK.
• If the adjustment within specification is not possible, clean the head. If the next adjustment is still out of specification, use another tape.
(1) Click [PB EQ (Error rate)].
(2) Click the [OK] button.
(3) Adjust "New value" of each address to minimize the error rate, by following the order shown in the flow chart.
(4) After adjustment, click the "v" marking and set the power button of the set to OFF.
1D/A Y level adjustment• Internal color bars (100%)
• Oscilloscope		EE
(With PLAY lit on the set)		Y OUT
(75 Ω terminated)
76h
1.00 ± 0.05 Vp-p		(1) Click [D/A Y Level].
(2) Click the [OK] button.
(3) Press the "PLAY" button of the set and check that the LED lights up.
(4) Adjust "New value" (address "76h") so that the Y level becomes the adjustment level.
(5) After adjustment, click the "v" marking and set the power button of the set to OFF.
2D/A C level adjustment• Internal color bars (100%)
• Oscilloscope		EE
(With PLAY lit on the set)		C OUT
(75 Ω terminated)
60h
NTSC 0.286 ± 0.01 Vp-p
PAL 0.30 ± 0.01 Vp-p
(Burst)		(1) Click [D/A C Level].
(2) Click the [OK] button.
(3) Press the "PLAY" operation button of the set and check that the LED lights up.
(4) Adjust "New value" (address "60h") so that the burst level becomes the adjustment level.
(5) After adjustment, click the "v" marking and set the power button of the set to OFF.
1Fs PLL (48k) adjustment• No signal
• Frequency counter		EETP FS PLL (connector cable)
62h
12.288 ±0.020 MHz		(1) Click [Fs PLL (48k)].
(2) Click the [OK] button.
(3) Adjust "New value" (address "62h") so that the frequency level becomes the adjustment level.
(4) After adjustment, click the "v" marking and set the power button of the set to OFF.
2Fs PLL (44.1k) adjustment• No signal
• Frequency counter		EETP FS PLL (connector cable)
FCh
11.2896 ± 0.110 MHz		(1) Click [Fs PLL (44.1k)].
(2) Click the [OK] button.
(3) Adjust "New value" (address "FCh") so that the frequency level becomes the adjustment level.
(4) After adjustment, click the "v" marking and set the power button of the set to OFF.
3Fs PLL (38k) adjustment• No signal
• Frequency counter		EETP FS PLL (connector cable)
FDh
8.192 ±0.080 MHz		(1) Click [Fs PLL (38k)].
(2) Click the [OK] button.
(3) Adjust "New value" (address "FDh") so that the frequency level becomes the adjustment level.
(4) After adjustment, click the "v" marking and set the power button of the set to OFF.
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