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Troubleshooting Tips and Part # Information

BOSCH / Doboy B-550 Continuous Band Sealer

Following are recommended tips for troubleshooting Doboy B-550 Continuous Band Sealer problems.  You will also find a list of part numbers and descriptions for commonly used parts.

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Preventative Maintenance & Proper Use Tips*

Area of Machine

Advice / Technique

One Heat Element Does Not Get Hot

(Applies to B-550)

Heating Element wires may be loose or element is burned out. 

Check connections at temperature controller.  If both are tight, disconnect and check for continuity across heat element  wires.  

Solution: If no continuity, replace Heater Harness Assembly.

Neither Heat Element Gets Hot

(Applies to B-550)

Temperature controller may be broken.

Solution: Refer to Temperature controller manual and replace if necessary.

General Machine Set-up:

(Applies to Doboy B-550)

We will gladly try to talk you through proper set-up of your machine - Call us!

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Troubleshooting Tips & Tricks*

Problem Possible Cause & Solution

Can't Access Settings in Watlow EZ ZONE Temperature Controller

(Applies to Doboy B-550)

To access settings in the Watlow EZ ZONE Temperature Controller, the first step is to press and hold the Up and Down arrow keys (▲ | ▼), simultaneously, for six seconds until the controller says "A1 SEt".  If this doesn't work, try the following:

Possible Cause: Controller has lock-out setting to prevent all parameters from being changed except temperature set-point.  It's likely this lock-out setting is engaged.

Solution: Press and hold the Infinity Button () and the Green Button for six seconds until you see "CUSt FCty" on the display.

Then, press ▼ until you see "LoC FCty"

Press the Green Button - "3 LoC.o" - change the "3" to a "2"

Press the Green Button - "2 rLoC" - change the "2" to a "5"

Press the Green Button - "2 SLoC" - change the "2" to a "5"

Press the Infinity Button () two (2) times to return to the Main Screen.  You should now be able to access the setting screens by pressing the (▲ | ▼), simultaneously, for six seconds.

After you have made your desired setting changes, repeat the above process to return the "2,5,5" settings you made above to "3,2,2," to relock the controller.

One Heat Element Does Not Get Hot

(Applies to B-550)

Possible Cause: Heating Element wires may be loose or element is burned out.

Check connections at temperature controller. If both are tight, disconnect and check for continuity across heat element wires.

Solution: If no continuity, replace Heater Harness Assembly.

Neither Heat Element Gets Hot

(in a pair of two)

(Applies to CBS-D)

Possible Cause: Temperature controller may be broken.

Solution: Refer to Temperature controller manual and replace if necessary.

"E-7" Error Code on Temperature Controller Display

(Applies to CBS-D)

Possible Cause: Thermocouple wires are loose or broken. Check thermocouple wires at temperature controller. Make sure connections are tight. If they are and "E-7" error still appears, detach wires from temperature controller and check for continuity across thermocouple wires.

Solution: If no continuity, replace thermocouple (i.e. Heater Harness Assembly.)

PROBLEM: Contact us

(Applies to CBS-D)

Contact us with your problems. We will post the solution here! Watch here for more Solutions, Tips, and Tricks!

* Machine troubleshooting & repairs should only be attempted by a qualified mechanic or electrician.  Power should always be disconnected prior to troubleshooting.

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Please see your factory instruction manual for additional troubleshooting tips.
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* Machine troubleshooting & repairs should only be attempted by a qualified mechanic or electrician.  Power should always be disconnected prior to troubleshooting.

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Please see your factory instruction manual for additional troubleshooting tips.
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Common Replacement & Wear Parts (available at www.DoboyParts.com)

Parts for Doboy B-550 Series Machines
Spare Part # Description
10 * 8-110-910-200 Sealing Band - Teflon-coated (sold in sets of two)
2 * 8-110-627-793 Heating Element (B-550)
2 * 603237 Thermocouple Assembly with Grommet (B-550)
  401380 Back-up Sleeve (i.e. Rubber Compression Roller)
  364181 Bearings for [both] Compression Rollers
2 * 372192 Trimmer Blade (B-550 uses two, identical trimmer blades)
2 * 8-110-627-803 Fuse - 7 Amp
1 * 8-110-102-010 Fuse - 5 Amp
1* 440644 Fuse - 10 Amp
2 * 401002 Spring - Compression
4 * 401276 Belt Guide - Stationary
4 * 401275 Belt Guide - Moveable Set
8 * 401179 Spring - Compression
  215085 Watlube Heat Release - provides a barrier to oxidation of heater elements

NOTE: A * in the "Spare" column denotes a part that is recommended as a common spare part for this machine. If a number is listed, that quantity is typically included in the New Machine Spare Parts Kit Option available when ordering a new machine.  Trimmer and Coder spare part components with a quantity and * are included only with the respective Trimmer and Coder New Machine Spare Parts Kit Options. (Spare Parts Kit contents are subject to change without notice.)

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