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VCR Power Supply Hybrid Regulators
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This document provides pinouts for some of the common hybrid multiple output voltage regulators used in a large number of VCRs. A good source for this information is the ECG Semiconductor Master Replacement Guide (or the SK/NTE or other similar databooks).
Much of this list was compiled from entries in the ECG Semiconductor Master Replacement Guide and from replies to postings on the sci.electronics.repair newsgroup. Data for a several of the parts (those marked with *) has been generously provided by: Colin M. (colinmc@mail.zynet.co.uk). "Note that a number of chips produce the same output voltage at two pins: These outputs are separate. Separate DC inputs are also required. Our thanks to Sanyo Semiconductor (Europe) GmbH for supplying data on these devices and to Eugene Trundle for technical advice. Original data taken from a reference pulished by Television magazine. Scanned in by Colin McCormick. All errors to be blamed on Logitech Direct OCR software." Does my VCR use a hybrid voltage regulator? ------------------------------------------ VCRs typically use one of these types of power supplies: 1. Power transformer with linear regulator using 78/79XX parts or discrete components. The power transformer will be large and right near the AC line cord. 2. Power transformer with hybrid regulator like STK5481 or any of its cousins - multioutput with some outputs switched by power on. Again, the power transformer will be large and right near the AC line cord. The regulator will be a black box with multiple pins soldered to a circuit board and will be mounted on a heatsink usually in the vicinity of the power transformer. 3. Small switching power supply. Most common problems: shorted semiconductors, bad capacitors, open fusable resistors. In this case there is usually no large power transformer near the line input but a smaller transformer amidships. See the SMPS repair FAQ for info on these types of supplies. 4. Combo of the previous (for example, a power transformer feeding a switching supply) - these are less common. When to suspect the regulator? ----------------------------- Failure of one or more outputs of the power supply can result in symptoms anywhere from a totally dead VCR to problems in one subsystem such as the tuner or display. Multiple systems failures are a likely indication of a power supply problem as well.
First identify a suitable ground for your multimeter. With the VCR unplugged, test for continuity between the ground pin of the regulator and the chassis or a metal shield. Don't use the hybrid's ground pin as clipping anything to it increases the chance of an unfortunate short circuit. Check the outputs with the VCR both on and off if possible. The on/off should change with the power unless the unswitched output is dead and thus everything is dead. If any are low or 0, the regulator is most likely bad. Failure of these regulator blocks is a very likely cause where a VCR exhibits multiple system failures. While it is possible for an excessive load to be dragging down the power supply output, failure of the hybrid regulator is a lot more likely. However, also check the input voltage - typical values are 20 - 30 V DC. Defective rectifier diodes or filter capacitors can result in a low voltage or high ripple input which can result in low, noisy, or unstable outputs. For erratic problems or those that only occur under certain operating conditions, monitor the outputs on an oscilloscope (a storage scope would be nice) to see if they dip or have any noise on them. ******************************************************************************
VCR Regulator. (From Ken Koskie (aw345@lafn.org)). The voltages should be approximately the same in all modes: Off, EE, Play, and Record. Pin 1: VI1 6.7 V Pin 2: VI1 6.7 V Pin 3: 0.0V Pin 4: 0.0V Pin 5: VO 6.8 V Pin 6: NC Pin 7: GND Pin 8: VI2 18.5 V
* Three output series regulator in an eight-pin package: Pin 1: +5.1 V output Pin 2: +6.05 V input Pin 3: Load resistor Pin 4: Load resistor Pin 5: +12.3 V output Pin 6: on/off Pin 7: +30 V max input Pin 8: Chassis
VCR Positive Voltage Regulator: 13 V at 1 A, 6.05 V at 1 A, 5.1 V at .5 A. Pin 1: VO3 +5.1 V Pin 2: VO2 +6.05 V Pin 3: VI2 Pin 4: Vb Pin 5: VO1 +13 V Pin 6: Gnd/SW Pin 7: VI1 Pin 8: Gnd
VCR Positive Voltage Regulator. 15 V at 1 A, 5.8 V at 1 A, 5.1 V at 1 A, 8 Pin SIP. Pin 1: GND Pin 2: VO3 +5.1 V Pin 3: VO2 +5.8 V Pin 4: VI2 Pin 5: Vb Pin 6: VO1 +15 V Pin 7: SW Pin 8: VI1
* Three output series regulator in an eight-pin package. Pin 1: Chassis Pin 2: 5.1 V output Pin 3: 5.8V output Pin 4: 30V max. do. input Pin 5: Load resistor Pin 6: 12.3V output Pin 7: On/off switching Pin 8: 30V max d.c. input
* Three-output series regulator in an eight-pin package. Pin 1: Chassis Pin 2: +5.1 V output Pin 3: +5.8 V output Pin 4: +30 V max input Pin 5: Load resistor Pin 6: +12.3 V output Pin 7: On/off switching Pin 8: +30 V max input
VCR Positive Voltage Regulator. 12.3 V @ 1A, 6.0 V @ 1A, 5.3 V @ .6 A. Pin 1: VO3 +5.25 V Pin 2: VO2 +6.0 V Pin 3: Vb Pin 4: Vb Pin 5: VO1 +12.3 V Pin 6: Cutoff Pin 7: VI1 Pin 8: GND
VCR Positive Voltage Regulator. 12.1 V @ .8 A, 12 V @ .8 A, 5.3 V @ 1 A. 8 pin SIP. Pin 1: VO3 5.3 V (switched) Pin 2: Cutoff Pin 3: VI2 (input for VO3) Pin 4: VO2 12 V (switched) Pin 5: VO1 12.1 V Pin 6: Vb Pin 7: VI1 (input for 12 V outputs) Pin 8: Gnd
* Four-output series regulator in a fifteen-pin package. Pin 1: +12.3 V output Pin 2: Load resistor Pin 3: +12 V output (unswitched) Pin 4: Decoupling Pin 5: +30 V max input Pin 6: Link to pin 5 Pin 7: +30 V max input. Pin 8: +16 V output (unswitched) Pin 9: Link to pin 8 Pin 10: +9.55V output Pin 11: Load resistor Pin 12: Chassis Pin 13: On/off switching Pin 14: Decoupling Pin 15: Decoupling
* Four output series regulator in a fifteen pin package. Pin 1: +12V output Pin 2: Load resistor Pin 3: +12V output Pin 4: Decoupling Pin 5: +30 V max input Pin 6: Link to pin 5 Pin 7: +30 V max input Pin 8: +13 V output Pin 9: Link to pin 8 Pin 10: +9.5 V output Pin 11: Load resistor Pin 12: Chassis Pin 13: On/off switching Pin 14: Decoupling Pin 15: Decoupling
Pin 1: Out 5.1 V Pin 2: NC Pin 3: Out 12 V Pin 4: Ctrk 12 V Pin 5: In 12 V Pin 6: In 5 V Pin 7: In 15 V Pin 8: In 9.5 V Pin 9: Out 15 V Pin 10: Out 9.5 V Pin 11: Ctrl 9.5 V Pin 12: Gnd Pin 13: Ctrl 4 V Pin 14: Ctrl .6 V Pin 15: Ctrl 15 V
Pin 1: VO4 +6V Pin 2: NC Pin 3: VO3 +12V Pin 4: Bypass Pin 5: VI2 Pin 6: VO3 +12V Pin 7: VI1 Pin 8: VO1 +13V Pin 9: VO1 +13V Pin 10: VO2 +9.5V Pin 11: IB2 Pin 12: GND Pin 13: On/Off Pin 14: Bypass Pin 15 Bypass
VCR Positive Voltage Regulator. 12V @ 2A, 9V @ 1A, 5.5V @ .5A. 15 Pin SIP. Pin 1: VO3 +5.5 V Pin 2: NC Pin 3: NC Pin 4: NC Pin 5: NC Pin 6: VI2 Pin 7: VI1 Pin 8: VO1 +12V Pin 9: VO1 +12V Pin 10: VO2 +9V Pin 11: Bias Pin 12: GND Pin 13: Cutoff Pin 14: Bypass Pin 15: Ripple Filter
VCR Positive Voltage Regulator. 16V @ 1A, 12V @ 1A, 12V @ 1.5 A, 11.9 V @ 1.5A. Pin 1: 11.9 V Output 4 Pin 2: Control Volt Pin 3: DC Input 2 Pin 4: Reference input Pin 5: 12V Output 3 Pin 6: Reference input Pin 7: 16V/12V Output 1/2 Pin 8: Reference input Pin 9: DC input 2 Pin 10: DC input 1 Pin 11: Hi/Lo volt switch Pin 12: GND Pin 13: on/off control Pin 14: Heater switch (??) Pin 15: Reference input
VCR Positive Voltage Regulator. 12V @ 1A, 12V @ 1A, 5.1V @ .5A. 15 Pin SIP. Pin 1: VO3 +5.1 V Pin 2: NC Pin 3: NC Pin 4: NC Pin 5: NC Pin 6: VI2 Pin 7: VI1 Pin 8: VI1 Pin 9: VO1 +12V Pin 10: VO2 +12V Pin 11: IB2 Pin 12: GND Pin 13: Cutoff VO1 Pin 14: Cutoff VO2 Pin 15: IB1
VCR Positive Voltage Regulator. 12V @ 1A, 12V @ 1A, 5.3V @ 1A. 12 Pin SIP. Measured input voltages (your mileage may vary): VI1 = 18 V, VI2 = 8.5 V Pin 1: VO3 +5.3 V Pin 2: NC Pin 3: NC Pin 4: NC Pin 5: VI2 Pin 6: VI1 Pin 7: VI1 Pin 8: VO2 +12V Pin 9: VO1 +12V Pin 10: VO1/VO2 Cutoff Pin 11: GND Pin 12: Vb
VCR Positive Voltage Regulator. Pin 1: VO3 +5.3 V Pin 2: NC Pin 3: NC Pin 4: NC Pin 5: NC Pin 6: VI3 Pin 7: VI1 and 2 Pin 8: VI1 and 2 Pin 9: VO2 +12 V Pin 10: VO1 +12 V Pin 11: NC Pin 12: GND Pin 13: On/off Pin 14: On/off Pin 15: Vb (probably around 13-14 V)
* Three output series regulator in a twelve pin package. Pin l: +5.3 V Output Pin 2: NC Pin 3: NC Pin 4: NC Pin 5: +30 V max input Pin 6: +30 V max input Pin 7: Link to pin 6 Pin 8: +12.1 V output Pin 9: +12.1 V output Pin 10: Pin 9 output cut off Pin 11: Chassis Pin 12: Load resistor
VCR Positive Voltage Regulator. 12 V @ 1.5 A, 12 V @ 1.5 A, 5.3 V @ .5 A. 10 Pin SIPP. Pin 1: Iout 3 for 5.3 V Pin 2: Vout 3 control Pin 3: Iin 3 Pin 4: Iout 2 for 12 V (emitter) Pin 5: Ib 2 (base) Pin 6: Iin 2 (collector) Pin 7: Iout 1 for 12 V (emitter) Pin 8: Ib 1 (base) Pin 9: Iin 1 (collector) Pin 10: GND It appears as though Pin 1 is the output of an IC regulator for the 5.3 V. Pin 3 is the Vin - 20 V typ. Pin 2 is some kind of on off control. Pins 4-6 and 7-9 are the emitter, base, and collector for the two 12 V outputs. These are simple Darlington transistors setup to drive the outputs in an emitter follower configuration. Vin typ of 30 V. Deduced from schematic in ECG.
VCR Positive Voltage Regulator. 12v @ 1A, 12V @ 1A, 5.1V @ 1A. Pin 1: GND Pin 2: VI2 Pin 3: N/C Pin 4: VO3 +5.1V Pin 5: VO2 +12V Pin 6: VB Pin 7: VI1 Pin 8: VO1 +12V Pin 9: VB Pin 10: VI1 Pin 11: N/C Pin 12: GND
Pin 1: Ib3 Pin 2: VI2 Pin 3: VO4 +5.3 V Pin 4: VO3 +12.1 V Pin 5: VO3/VO4 ON/OFF Pin 6: VO2 +12.2 V Pin 7: Ib2 Pin 8: VI1 Pin 9: VO1 +12.0 V Pin 10: Ib1 Pin 11: VI1 Pin 12: GND
* Four output series regulator in a fifteen pin package. Pin 1: Chassis Pin 2: +30 V max input Pin 3: +5.1 V output Pin 4: +12 V output Pin 5: Bias/+12V output switching Pin 6: +30 V max input Pin 7: +5.8 V output Pin 8: Bias/pin 7 output switching Pin 9: Link to pin 2 Pin 10: Load resistor/pin 7 output switching Pin 11: +13/+15V output Pin 12: Pin 11 output switching Pin 13: Link to pin 6 Pin 14: Pin 11 output switching Pin 15: Chassis
VCR Positive Voltage Regulator. 13V @ 1A, 12.2V @ 1A, 6V @ 1A, 5.1V @ 1A, 5.1V @ 1A, 15 Pin SIP. Pin 1: VO5 +5.1 V Pin 2: NC Pin 3: VO4 +5.1 V Pin 4: VI2 Pin 5: NC Pin 6: VO3 +6 V Pin 7: VB Pin 8: VB Pin 9: VO2 +12.2 V Pin 10: Cutoff Pin 11: VI1 Pin 12: VO1 +13 V Pin 13: Cutoff Pin 14: VI1 Pin 15: GND