Troubleshooting Tips - Bose TouchTunes Service Manual

Digital

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TROUBLESHOOTING TIPS

1. The amplifier fault protection circuit can trip causing no audio output. To reset the Zone 1

and 2 amplifier fault protection circuit, turn off the power switch located in the rear of the unit,

wait five seconds and the turn-on the power switch.

2. Disconnect the power to the Jukebox. Open the rear panel and make sure that all the

connectors to the amplifier module and the I/O PCB are fully inserted. Close the back panel

and apply power to the Jukebox. If the Jukebox still does not operate properly, disconnect the

power from the Jukebox and perform the following procedures to isolate the failure.

3. Check the fuse that is located on the equalizer PCB (top PCB). See Figure 4 and procedure

5 in the disassembly/assembly section.

4. Disconnect the ZONE 1 or ZONE 2 transformer and measure the DC resistances of the

transformer primary (J7). It should be approximately 1.4 Ω. Replace the transformer if the

resistance is out of range.

5. If the transformer measures good, swap the ZONE 1 and ZONE 2 DIN input cable (J5). If

the problem switches (i.e. ZONE 1 has output now and ZONE 2 has no output) the problem is

with the I/O PCB. Replace the I/O PCB.

6. If the problem does not switch when the DIN input cable is swapped between ZONE 1 and

ZONE 2 and the problem is with ZONE 1, disconnect the woofer output cable (J3) from the

ZONE 1 amplifier module. Measure the DC resistance between the black and red wire. It

should be 5.3 Ω. If the DC resistance is out of range, a woofer is defective. Remove each

woofer and check its DC resistance. Each woofer should measure 5.3 Ω. Replace the defec-

tive woofer(s).

7. If the DC resistance of the woofer measures good, disconnect the RCA plugs (J9) from the

amplifier module. Measure the DC resistance between the tip and sleeve of the RCA plug (red

and white). It should be 2.8 Ω. If it measures out of range, remove the 141

JB speakers and

measure the DC resistance of each speaker (right side only if the red RCA plug is out of range,

left side only if the white RCA plug measures out of range). Each speaker should measure

1.4 Ω. Replace the defective 141JB speaker(s).

8. If the failure is not identified using procedures 1 through 6, the problem is with the amplifier

module. Replace the amplifier module.

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