4. If this does not occur, the horizontal oscillator disable circuit is
not operating. Follow the Repair Procedures of horizontal
oscillator disable circuit before the set is returned to customer.
2.2. REPAIR PROCEDURES OF HORIZONTAL OSCILLATOR
DISABLE CIRCUIT
1. Connect a DC voltmeter between capacitor C513 (+) on the Main
circuit board and chassis ground.
2. If approxi21.5 V is not present at that point when 120 V
AC is applied, find the cause. Check R503, R5505, C5507, C513
and D503.
3. Carefully check above specified parts and related circuits and
parts. When the circuit is repaired, try the horizontal oscillator
disable circuit test again.
2.3. CIRCUIT EXPLANATION
2.3.1. HORIZONTAL OSCILLATOR DISABLE CIRCUIT
The positive DC voltage, supplied from the D503 cathode for monitoring high voltage, is applied
to the IC5301 Pin11 through R503 and R5504. Under normal conditions, the voltage at IC5301
Pin 11 is less than approx. 3 V. If the high voltage at FlybackTransformer Pin 5 exceeds the
specified voltage, the positive DC voltage which is supplied from the D503 cathode also
increases. The increased voltage is applied to IC5301 Pin11 through R503 and R5504. Due to the
increased voltage at IC5301 Pin11,the horizontal oscillator frequency increases, the picture goes
out of horizontal sync, the beam current decreases and the picture become dark in order to
keep X-radiation under specification.
Figure 2
2.4. LASER PRODUCT
CLASS I LASER PRODUCT
- This equipment is certified to comply with DHHS Rules 21 CFR
Chapter 1, Subchapter J in effect as of date of manufacture. (Only
for U.S.A.)
This equipment is classified as a Class I (Class 1) level LASER Product and there is no
hazardous LASER radiation with the safety protection.
Caution:
Use of controls or adjustments or performance of procedures other
6
Summary of Contents for PVDM2092 - MONITOR/DVD COMBO
Page 1: ...ORDER NO MKE0207607C1 B22 TV DVD VCR Combination PV DM2092 PV DM2092 K SPECIFICATIONS 1...
Page 10: ...Fig 1 4 Fig 1 5 10...
Page 27: ...CAUTION Disconnect AC plug before disassembly Fig D1 Fig D2 27...
Page 28: ...Fig D3 28...
Page 29: ...6 1 1 1 Notes in chart 1 Removal of VCR DVD Ass y Fig D4 29...
Page 33: ...6 2 3 EJECT Position Confirmation Fig J1 2 33...
Page 34: ...6 2 4 Full Erase Head and Cylinder Unit Fig J2 34...
Page 76: ...76...
Page 79: ...11 2 MECHANISM BOTTOM SECTION 79...
Page 80: ...11 3 CASSETTE UP COMPARTMENT SECTION 80...
Page 81: ...11 4 CHASSIS FRAME SECTION 1 81...
Page 82: ...11 5 CHASSIS FRAME SECTION 2 82...
Page 83: ...11 6 CHASSIS FRAME SECTION 3 83...
Page 84: ...11 7 PACKING PARTS AND ACCESSORIES SECTION 84...