100 Minute Master Up/Down Timer

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100 Minute Master Up/Down Timer
Preliminary Information
Release Year 1994
Leak Risk Low
Batteries None
Mounting Technology Through Hole, Sockets
Capacitor Types Aluminum Electrolytic, Ceramic
Destructive Entry No

This is a standalone timer used in studios for synchronizing coundown/countup clocks. Manufactured by ESE. Model ES-362A. Uses Intel 8749-CT4 as the microcontroller.

Known Issues

The linear power supply runs hot and relies on electrolytic capacitors.

Symptom or Problem Encountered

  • No display
  • No timing signal

Causes

  • Dried out electrolytic capacitors and a blown linear regulator IC.

Solutions

  • Replace faulty parts.

Disassembly Notes

This device is easy to disassemble. The case is held together with screws and the PCB can be detached from the plastic standoffs easily. Make sure to snip the cable ties to make the wires long enough to flip over the board.

Original Parts

Main PCB

ES362A - PCB UCT-1 Logic

Capacitor Specifications and Footprint Information
RefDes Qty Capacitance Voltage Mount Diameter/Size Lead Spacing Temp Type Brand Series
C1 1 4700 µF 10 Through Hole, Axial 12mm 85 °C Electrolytic Shoei CE
C2, C3 2 3300 µF 16 Through Hole, Radial 16mm 0.3" 105 °C Electrolytic Shoei CEW
C4 1 10 µF 35 Through Hole, Radial 5mm 0.1" 105 °C Electrolytic Shoei CEW
C5 1 100 µF 25 Through Hole, Radial 6mm 0.1" 105 °C Electrolytic Shoei CEW
C6, C7 2 10 pF 50 Through Hole, Radial 4mm 0.2" Ceramic Disc
C8, C10 3 0.01 µF 50 Through Hole, Radial 6mm 0.2" Ceramic Disc
C9 1 4.7 µF 50 Through Hole, Radial 4mm 0.1" 105 °C Electrolytic Shoei CEW
C11 1 0.1 µF 50 Through Hole, Radial 5mm 0.2" Ceramic Disc
Other Passive Component Specifications and Footprint Information
RefDes Qty Value Power Mount Temp Type Tolerance
R1, R2 2 75Ω ½ Watt Through Hole, Axial Carbon Film 10%
R3 1 51kΩ ¼ Watt Through Hole, Axial Carbon Film 10%
R4 1 120kΩ ¼ Watt Through Hole, Axial Carbon Film 10%
R5, R6, R9-R16 10 22kΩ ¼ Watt Through Hole, Axial Carbon Film 10%
R7 (option Y and Z models only) 1 5.1kΩ ¼ Watt Through Hole, Axial Carbon Film 10%
R9-R46 27 220Ω ¼ Watt Through Hole, Axial Carbon Film 10%
R47-R53 (option T models only) 7 220Ω ¼ Watt Through Hole, Axial Carbon Film 10%
R62 (option T models only) 1 330Ω ¼ Watt Through Hole, Axial Carbon Film 10%
R63 1 18Ω ¼ Watt Through Hole, Axial Carbon Film
R64 1 150Ω ½ Watt Through Hole, Axial Carbon Film
R65-R69 1 510Ω ¼ Watt Through Hole, Axial Carbon Film
X1 1 1.8432 MHz Through Hole, HC-49/U
T1 1 6.3V CT 140.4 VA Chassis Mount P6134
Active Component Specifications and Footprint Information
RefDes Qty Device Type Voltage Current Mount
Z1 1 8749-CT4 Microcontroller Through Hole, DIP
Z2 1 4503 Hex non-inverting buffer with three-state outputs Through Hole, DIP
Z3 1 LM330T-5.0 5 volt linear regulator 5V 0.150A Through Hole
Z6-Z9 4 4511 BCD to 7-segment latch/decoder/driver Through Hole, DIP
Z10 (option T models only) 1 4511 BCD to 7-segment latch/decoder/driver Through Hole, DIP
Q1 1 PN2222 NPN BJT transistor VCEO: 30V IC: 0.6A Through Hole
D1-D5 5 1N4003 Rectifier Diode VR: 200V IO: 1A Through Hole
D6 (option Y and Z models only) 1 1N4003 Rectifier Diode VR: 200V IO: 1A Through Hole
D7-D23 17 1N4148 Small Signal Diode VR: 75V IO: 0.2A Through Hole

Replacement Parts

Main PCB

Capacitors
RefDes Qty Compatible Part Number Order Links
C1 1 478TTA010M-ND Digikey
C2, C3 2 493-1797-ND Digikey
C4 1 493-11317-1-ND Digikey
C5 1 493-10975-1-ND Digikey
C9 1 493-13474-1-ND Digikey

If parts are not available or different selection is preferred, you can use the values in the Original Parts section to perform a parametric search.

Connector Pinouts

DE-9
Pin Function
1 Up
2 Stop
3 Reset
4 Down
5 Preset
6 Relay contact (dry contact, option "Z")
7 Relay contact (dry contact, option "Z")
8 N/C
9 Ground
BNC
Pin Function
Center Serial Time Signal Out
Shield Ground

Related Links

References