I need help with a journal entry posting for my accounting assignment. I am asked to post this transaction to the journal entry:

Oct. 3 Purchased repair equipment from Conklin Company, $4,400. Paid $600 down and the balance was
Placed on account. Payments will be $200.00 per month for nineteen months. The first payment is due 11/1.

The accounts I am supposed to use are "Accumulated depreciation, Repair Equipment" and "Depreciation Expense, Repair Equipment" in addition to "Office Equipment" and "Cash".

I would really appreciate your help!

Your accounts will be Cash, Repair Equipment, and Accounts Payable.

You are paying cash of $600 and placing the rest of the cost of equipment on a loan.

So your journal entry will be:
Debit Repair Equipment for 4,400
Credit Cash for $600
Credit Accounts Receivable for the difference between your debit and credit amounts.

The rest of the information is not relevant for the Oct 3 transaction.

For the difference between your debits and credits you only have to 2 choices to choose from, accounts payable and notes payable, but the reason Accounts payable is used is because of the keywords in the problem is "balance placed on account"