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, Trimmer (some models)
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
C7 (option C models only) 5-30 pF Through Hole Trimmer Capacitor
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
Part RefDes Qty Value Power Mount Temp Type Tolerance
Resistor R1, R2 2 75Ω ½ Watt Through Hole, Axial Carbon Film 10%
Resistor R3 1 51kΩ ¼ Watt Through Hole, Axial Carbon Film 10%
Resistor R4 1 120kΩ ¼ Watt Through Hole, Axial Carbon Film 10%
Resistor R5, R6, R9-R16 10 22kΩ ¼ Watt Through Hole, Axial Carbon Film 10%
Resistor R7 (option Y and Z models only) 1 5.1kΩ ¼ Watt Through Hole, Axial Carbon Film 10%
Resistor R9-R46 27 220Ω ¼ Watt Through Hole, Axial Carbon Film 10%
Resistor R47-R53 (option T models only) 7 220Ω ¼ Watt Through Hole, Axial Carbon Film 10%
Resistor R62 (option T models only) 1 330Ω ¼ Watt Through Hole, Axial Carbon Film 10%
Resistor R63 1 18Ω ¼ Watt Through Hole, Axial Carbon Film
Resistor R64 1 150Ω ½ Watt Through Hole, Axial Carbon Film
Resistor R65-R69 1 510Ω ¼ Watt Through Hole, Axial Carbon Film
Crystal X1 1 1.8432 MHz Through Hole, HC-49/U
Transformer T1 1 6.3V CT 7.6 VA Chassis Mount P6134
Transformer T1, T2 (option P models only) 2 6.3V CT 3.8 VA Chassis Mount P6465
Relay K1 (option Y and Z models only) 1 1A 5A Through Hole
Active Component Specifications and Footprint Information
Part RefDes Qty Device Type Voltage Current Mount
IC Z1 1 8749-CT4 Microcontroller Through Hole, DIP
IC Z2 1 4503 Hex non-inverting buffer with three-state outputs Through Hole, DIP
IC Z3 1 LM330T-5.0 5 volt linear regulator 5V 0.150A Through Hole
IC Z6-Z9 4 4511 BCD to 7-segment latch/decoder/driver Through Hole, DIP
IC Z10 (option T models only) 1 4511 BCD to 7-segment latch/decoder/driver Through Hole, DIP
Transistor Q1 1 PN2222 NPN BJT transistor VCEO: 30V IC: 0.6A Through Hole
Transistor Q3 (option Y and Z models only) 1 2N2907 PNP BJT transistor VCEO: 60V IC: 0.6A Through Hole
Diode D1-D5 5 1N4003 Rectifier Diode VR: 200V IO: 1A Through Hole
Diode D6 (option Y and Z models only) 1 1N4003 Rectifier Diode VR: 200V IO: 1A Through Hole
Diode D7-D23 17 1N4148 Small Signal Diode VR: 75V IO: 0.2A Through Hole
Diode DJT (option T models only) 1 1N4148 Small Signal Diode VR: 75V IO: 0.2A Through Hole
Diode DJZ (option Z models only) 1 1N4148 Small Signal Diode VR: 75V IO: 0.2A Through Hole
Diode DJN (option N models only) 1 1N4148 Small Signal Diode VR: 75V IO: 0.2A Through Hole

Display PCB

ES362A - PCB UCT Display

Active Component Specifications and Footprint Information
Part RefDes Qty Device Type Voltage Current Mount
Display N1, N2 2 LTD6840Y Two-digit amber LED display VF: 2.1V IF: 0.02A Through Hole, DIP
Display N3 (option T models only) 1 LTD6840Y Two-digit amber LED display VF: 2.1V IF: 0.02A Through Hole, DIP

Replacement Parts

Main PCB

Capacitors
RefDes Qty Compatible Part Number Order Links
C1 1 478TTA010M-ND Digikey
C2, C3 2 UPW1C332MHD Digikey Mouser
C4 1 UPS1C100MDD1TD Digikey Mouser
C5 1 UFW1C101MDD1TD Digikey Mouser
C6, C7 2 K100J15C0GF5TH5 DigiKey Mouser
C8, C10, C11 3 K103K10X7RF5UH5 DigiKey Mouser
C9 1 UVZ1H4R7MDD1TD Digikey Mouser
Resistors
RefDes Qty Compatible Part Number Order Links
R1, R2 2 CFM12JT75R0 / CMF5575R000FKEB Digikey Mouser
R3 1 RNMF14FTC51K0 / H851K1BCA DigiKey Mouser
R4 1 RNMF14FTC120K / H8120KFDA DigiKey Mouser
Other Passive Components
RefDes Qty Compatible Part Number Order Links
X1 1 AB-1.8432MHZ-B2 Digikey Mouser
Active Components
RefDes Qty Compatible Part Number Order Links
Z3 1 LM330T-5.0/NOPB Digikey Mouser
Q1 1 PN2222ABU DigiKey Mouser
D1-D5 5 1N4003G DigiKey Mouser
D7-D23 16 1N4148 DigiKey Mouser
DJT/DJZ/DJN 1 1N4148 DigiKey Mouser

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

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