100 Minute Master Up/Down Timer

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

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

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

• Current replacement device